TWI763416B - Controllers, systems, and methods for driving a light source - Google Patents

Controllers, systems, and methods for driving a light source Download PDF

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TWI763416B
TWI763416B TW110112457A TW110112457A TWI763416B TW I763416 B TWI763416 B TW I763416B TW 110112457 A TW110112457 A TW 110112457A TW 110112457 A TW110112457 A TW 110112457A TW I763416 B TWI763416 B TW I763416B
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voltage
current
light source
signal
controller
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TW110112457A
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TW202139778A (en
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李勝泰
凱平 冉
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英屬開曼群島商凹凸科技國際股份有限公司
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/32Pulse-control circuits
    • H05B45/325Pulse-width modulation [PWM]
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10Controlling the light source
    • H05B47/105Controlling the light source in response to determined parameters
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10Controlling the light source
    • H05B47/165Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

A controller includes a voltage detection terminal, a current detection terminal and a voltage sensing terminal. The voltage detection terminal senses a second output voltage. The current detection terminal senses a current of a light source. The second output voltage is sensed prior to the current of the light source. The voltage sensing terminal receives a voltage sensing signal indicative of a first output voltage. The controller adjusts the voltage sensing signal based on the second output voltage, to enable the second output voltage in a preset voltage range; when the second output voltage is in the preset voltage range, the controller adjusts the adjusted voltage sensing signal based on a difference between the current of the light source and a target current value, to enable the current of the light source to maintain the target current value. The controller enables the light source to work in the best possible state value, to reduce power consumption. The controller is also compatible with a variety of displays, to simplify their design.

Description

控制器、光源驅動系統及光源驅動方法 Controller, light source driving system and light source driving method

本發明係有關光源供電技術領域,尤其係有關一種控制器、光源驅動系統及方法。 The invention relates to the technical field of light source power supply, in particular to a controller, a light source driving system and a method.

目前,LED光源已應用於各種各樣的環境中。為了滿足不同環境的需求,LED光源的亮度需要被調節。一般來說,光源驅動系統需要不斷調節為光源供電的輸出電壓,以將流經光源的電流調節至目標電流值。但是,這種做法會增加光源驅動系統的功耗,從而降低功率效率。 Currently, LED light sources have been used in a variety of environments. In order to meet the needs of different environments, the brightness of the LED light source needs to be adjusted. Generally speaking, the light source driving system needs to continuously adjust the output voltage for powering the light source, so as to adjust the current flowing through the light source to a target current value. However, this practice will increase the power consumption of the light source driving system, thereby reducing the power efficiency.

本發明提供了一種控制器。該控制器用於控制電能轉換器產生的為光源供電的第一輸出電壓及為光源以外的元件供電的第二輸出電壓。控制器包括電壓檢測端、電流檢測端及電壓感應端。電壓檢測端用於感應第二輸出電壓。電流檢測端耦接於光源,用於感應流過光源的光源電流。其中,第二輸出電壓先於光源電流被感應到。電壓感應端經由電壓感應電路與該電能轉換器耦接,用於接收指示第一輸出電壓的電壓感應信號,其中電壓感應信號由電壓感應電路產生。其中,控制器根據第二輸出電壓調節電壓感應信號以產生調節後的電壓感應信號,並根據調節後的電壓感應信號產生第一控制電流,以使電能 轉換器根據第一控制電流控制第二輸出電壓處於一預設電壓範圍內。其中,當第二輸出電壓處於該預設電壓範圍內時,控制器再根據光源電流與目標電流值之間的差值調節調節後的電壓感應信號以產生二次調節後的電壓感應信號,並根據該二次調節後的電壓感應信號產生第二控制電流,以使電能轉換器根據該第二控制電流控制光源電流保持為該目標電流值。 The present invention provides a controller. The controller is used for controlling the first output voltage for powering the light source and the second output voltage for powering the components other than the light source generated by the power converter. The controller includes a voltage detection terminal, a current detection terminal and a voltage sensing terminal. The voltage detection terminal is used for sensing the second output voltage. The current detection terminal is coupled to the light source and used for sensing the light source current flowing through the light source. Wherein, the second output voltage is sensed before the light source current. The voltage sensing terminal is coupled to the power converter via the voltage sensing circuit, and is used for receiving a voltage sensing signal indicating the first output voltage, wherein the voltage sensing signal is generated by the voltage sensing circuit. The controller adjusts the voltage sensing signal according to the second output voltage to generate an adjusted voltage sensing signal, and generates a first control current according to the adjusted voltage sensing signal, so that the electrical energy The converter controls the second output voltage to be within a predetermined voltage range according to the first control current. Wherein, when the second output voltage is within the preset voltage range, the controller then adjusts the adjusted voltage sensing signal according to the difference between the light source current and the target current value to generate a secondary adjusted voltage sensing signal, and A second control current is generated according to the secondary adjusted voltage sensing signal, so that the power converter controls the light source current according to the second control current to maintain the target current value.

本發明還提供了一種光源驅動系統。該光源驅動系統包括電能轉換器及控制電路。電能轉換器用於將輸入電能轉換成為光源供電的第一輸出電壓及為系統中除光源以外的元件供電的第二輸出電壓。控制電路耦接電能轉換器及光源,用於感應第一輸出電壓、第二輸出電壓及流過光源的光源電流。其中,第一輸出電壓和第二輸出電壓均先於光源電流被感應到。其中,控制電路根據第一輸出電壓產生電壓感應信號,並根據第二輸出電壓調節電壓感應信號以產生調節後的電壓感應信號,再根據調節後的電壓感應信號產生第一控制信號,以使電能轉換器根據第一控制信號控制第二輸出電壓處於預設電壓範圍內。其中,當第二輸出電壓處於預設電壓範圍內時,控制電路根據光源電流調節調節後的電壓感應信號以產生二次調節後的電壓感應信號,再根據二次調節後的電壓感應信號產生第二控制信號,以使電能轉換器根據第二控制信號控制光源電流保持為目標電流值。 The invention also provides a light source driving system. The light source driving system includes a power converter and a control circuit. The power converter is used for converting the input power into a first output voltage for powering the light source and a second output voltage for powering the components other than the light source in the system. The control circuit is coupled to the power converter and the light source for sensing the first output voltage, the second output voltage and the light source current flowing through the light source. The first output voltage and the second output voltage are both sensed before the light source current. The control circuit generates a voltage sensing signal according to the first output voltage, adjusts the voltage sensing signal according to the second output voltage to generate an adjusted voltage sensing signal, and then generates a first control signal according to the adjusted voltage sensing signal, so that the electrical energy The converter controls the second output voltage to be within a preset voltage range according to the first control signal. Wherein, when the second output voltage is within the preset voltage range, the control circuit adjusts the adjusted voltage sensing signal according to the light source current to generate the secondary adjusted voltage sensing signal, and then generates the second adjusted voltage sensing signal according to the secondary adjusted voltage sensing signal. two control signals, so that the power converter controls the light source current to maintain the target current value according to the second control signal.

本發明還提供了一種光源驅動方法。該方法包括:電能轉換器將輸入電能轉換成為光源供電的第一輸出電壓及為光源以外的元件供電的第二輸出電壓;控制電路感應第一輸出電壓、第二輸出電壓及流過光源的光源電流;其中第一輸出電壓及第二輸出電壓均先於光源電流被感應到;控制電路產生指示第一輸出電壓的電壓感應信號;控制電路根據第二輸出電壓調節電壓感應信 號以產生調節後的電壓感應信號,再根據調節後的電壓感應信號產生第一控制信號;電能轉換器根據第一控制信號調節第二輸出電壓,以使第二輸出電壓處於預設電壓範圍內;當第二輸出電壓處於預設電壓範圍內時,控制電路根據光源電流調節調節後的電壓感應信號以產生二次調節後的電壓感應信號,再根據二次調節後的電壓感應信號產生第二控制信號;及電能轉換器根據第二控制信號調節第一輸出電壓,以使光源電流保持為目標電流值。 The invention also provides a light source driving method. The method includes: the power converter converts the input power into a first output voltage for powering the light source and a second output voltage for powering components other than the light source; a control circuit senses the first output voltage, the second output voltage and the light source flowing through the light source current; wherein the first output voltage and the second output voltage are both sensed before the light source current; the control circuit generates a voltage sensing signal indicating the first output voltage; the control circuit adjusts the voltage sensing signal according to the second output voltage signal to generate the adjusted voltage sensing signal, and then generate the first control signal according to the adjusted voltage sensing signal; the power converter adjusts the second output voltage according to the first control signal, so that the second output voltage is within the preset voltage range When the second output voltage is within the preset voltage range, the control circuit adjusts the adjusted voltage sensing signal according to the light source current to generate a secondary adjusted voltage sensing signal, and then generates a second voltage sensing signal according to the secondary adjusted voltage sensing signal. a control signal; and the power converter adjusts the first output voltage according to the second control signal to keep the light source current at the target current value.

本發明透過優先根據第一輸出電壓及第二輸出電壓調節第二輸出電壓以使第二輸出電壓處於預設電壓範圍內。當第二輸出電壓處於預設電壓範圍內時,再根據第一輸出電壓和光源電流調節第一輸出電壓以使光源電流保持為目標電流值。本發明透過調節第一輸出電壓和第二輸出電壓,一方面可使光源工作在最佳狀態(光源電流保持為目標電流值),減少功耗,提高功率效率,另一方面還可相容多種顯示器而無需任何更改,設計更簡易。 The present invention adjusts the second output voltage according to the first output voltage and the second output voltage preferentially so that the second output voltage is within a predetermined voltage range. When the second output voltage is within the preset voltage range, the first output voltage is adjusted according to the first output voltage and the light source current to keep the light source current at the target current value. By adjusting the first output voltage and the second output voltage, on the one hand, the invention can make the light source work in the best state (the light source current is kept at the target current value), reduce power consumption, and improve power efficiency, and on the other hand, it can be compatible with various The display does not require any changes, and the design is simpler.

100:光源驅動系統 100: Light source drive system

102:整流器 102: Rectifier

103:電能轉換器 103: Power Converter

104:光源 104: Light source

105:控制電路 105: Control circuit

200:光源驅動系統 200: Light source drive system

210:電壓監測電路 210: Voltage monitoring circuit

220:控制器 220: Controller

230:電壓感應電路 230: Voltage Sensing Circuit

240:光耦合器 240: Optocoupler

250:負載單元 250: Load Cell

260:過壓保護單元 260: Overvoltage protection unit

310:比較與回饋電路 310: Comparison and Feedback Circuits

311:電壓檢測端 311: Voltage detection terminal

312:電流檢測端 312: Current detection terminal

313:第一邏輯電路 313: First logic circuit

314:第二邏輯電路 314: Second logic circuit

315:轉換單元 315: Conversion unit

320:電流感應與均衡電路 320: Current Sensing and Equalization Circuits

321:選擇器 321: selector

322:開關控制單元 322: Switch control unit

323:積分電路 323: Integrator circuit

330:並聯調節器 330: Parallel regulator

340:驅動器 340: Drive

410:PWM信號產生器 410: PWM signal generator

420:開關式變壓器電路 420: Switching Transformer Circuits

500:流程圖 500: Flowchart

501~509:步驟 501~509: Steps

600:流程圖 600: Flowchart

601~622:步驟 601~622: Steps

第1圖係根據本發明一個實施例的光源驅動系統的電路圖。 FIG. 1 is a circuit diagram of a light source driving system according to an embodiment of the present invention.

第2圖係根據本發明另一個實施例的光源驅動系統的電路圖。 FIG. 2 is a circuit diagram of a light source driving system according to another embodiment of the present invention.

第3圖係根據本發明一個實施例的控制器的電路圖。 FIG. 3 is a circuit diagram of a controller according to one embodiment of the present invention.

第4圖係根據本發明一個實施例的電能轉換器的電路圖。 FIG. 4 is a circuit diagram of a power converter according to an embodiment of the present invention.

第5圖係根據本發明一個實施例的驅動光源的方法流程圖。 FIG. 5 is a flowchart of a method for driving a light source according to an embodiment of the present invention.

第6圖係根據本發明另一個實施例的驅動光源的方法流程圖。 FIG. 6 is a flowchart of a method for driving a light source according to another embodiment of the present invention.

以下將對本發明的實施例給出詳細的說明。儘管本發明透過這些實施方式進行闡述和說明,但需要注意的是本發明並不僅僅只局限於這些實施方式。相反地,本發明涵蓋後附申請專利範圍所定義的發明精神和發明範圍內的所有替代物、變體和等同物。在以下對本發明的詳細描述中,為了提供一個針對本發明的完全的理解,闡明瞭大量的具體細節。然而,本領域技術人員將理解,沒有這些具體細節,本發明同樣可以實施。在另外的一些實例中,對於大家熟知的方案、流程、元件和電路未作詳細描述,以便於凸顯本發明的主旨。 A detailed description will be given below of embodiments of the present invention. Although the present invention is illustrated and described with reference to these embodiments, it should be noted that the present invention is not limited only to these embodiments. On the contrary, this invention covers all alternatives, modifications and equivalents within the spirit and scope of the invention as defined by the appended claims. In the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, one skilled in the art will understand that the present invention may be practiced without these specific details. In other instances, well-known solutions, procedures, components and circuits have not been described in detail in order to facilitate the disclosure of the subject matter of the present invention.

第1圖係根據本發明一個實施例的光源驅動系統100的電路圖。該系統100包含電源VAC、整流器102、電能轉換器103、光源104及控制電路105。在一實施例中,光源104包括多個並聯的發光二極體(Light Emitting Diode,LED)串(如,LED串S1、S2、......、SN,見第2圖)。其中,每個LED串包括多個串聯的LED。第一輸出電壓VOUT為每一個LED串供電,從而產生流過每一個LED串的光源電流Ij,j=1,2,......,N。在其他實施例中,光源104也可以包括一個LED或者一個LED串。 FIG. 1 is a circuit diagram of a light source driving system 100 according to an embodiment of the present invention. The system 100 includes a power source V AC , a rectifier 102 , a power converter 103 , a light source 104 and a control circuit 105 . In one embodiment, the light source 104 includes a plurality of light emitting diode (Light Emitting Diode, LED) strings (eg, LED strings S1 , S2 , . . . , SN, see FIG. 2 ) connected in parallel. Wherein, each LED string includes a plurality of LEDs connected in series. The first output voltage V OUT powers each LED string, thereby generating a light source current I j , j=1, 2, . . . , N flowing through each LED string. In other embodiments, the light source 104 may also include an LED or a string of LEDs.

該整流器102耦接於電源VAC和電能轉換器103之間,接收並整流電源VAC提供的電能(例如:220V電能、110V電能等)從而提供整流電能給電能轉換器103。該整流電能可視為電能轉換器103的輸入電能。在本實施例中,整流器102為全橋式整流器。 The rectifier 102 is coupled between the power source V AC and the power converter 103 , receives and rectifies the power (eg, 220V power, 110V power, etc.) provided by the power source V AC to provide the rectified power to the power converter 103 . The rectified power can be regarded as the input power of the power converter 103 . In this embodiment, the rectifier 102 is a full-bridge rectifier.

該電能轉換器103分別耦接於光源104和控制電路105,將輸入電能轉換成為光源104供電的第一輸出電壓VOUT和為該系統100中除光源104以外的元件供電的第二輸出電壓VS。在本實施例中,該電能轉換器103為AC/DC(Alternating Current/Direct Current,交流/直流)轉換器。 The power converter 103 is coupled to the light source 104 and the control circuit 105 respectively, and converts the input power into a first output voltage V OUT for powering the light source 104 and a second output voltage V for powering the components other than the light source 104 in the system 100 S. In this embodiment, the power converter 103 is an AC/DC (Alternating Current/Direct Current, alternating current/direct current) converter.

該控制電路105耦接於光源104和電能轉換器103,感應第一輸出電壓VOUT、第二輸出電壓VS及流過光源104的光源電流I1、I2、......、IN。其中,第一輸出電壓VOUT及第二輸出電壓VS均先於光源電流I1、I2、......、IN被感應到。控制電路105根據第一輸出電壓VOUT產生電壓感應信號VSEN(未經調節的電壓感應信號VSEN),並根據第二輸出電壓VS調節該電壓感應信號VSEN以產生調節後的電壓感應信號VSEN(第1圖未標出),再根據調節後的電壓感應信號VSEN(第1圖未標出)產生第一控制信號S1,以使電能轉換器103根據該第一控制信號S1控制第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,控制電路105根據光源電流I1、I2、......、IN調節該調節後的電壓感應信號VSEN以產生二次調節後的電壓感應信號VSEN,再根據二次調節後的電壓感應信號VSEN(第1圖未標出)產生第二控制信號S2,以使電能轉換器103根據該第二控制信號S2控制光源電流I1、I2、......、IN保持為目標電流值。在本發明中,「二次調節後的」這一術語是指信號被調節且調節後的信號隨後又被調節,該術語並不一定指信號只被調節了兩次。目標電流值和預設電壓範圍是由使用者設定或設計者指定。在一實施例中,預設電壓範圍為7V~25V。 The control circuit 105 is coupled to the light source 104 and the power converter 103 , and senses the first output voltage V OUT , the second output voltage V S and the light source currents I 1 , I 2 , . . . , flowing through the light source 104 . IN . The first output voltage V OUT and the second output voltage V S are both sensed before the light source currents I 1 , I 2 , . . . , IN . The control circuit 105 generates a voltage sensing signal VSEN (unregulated voltage sensing signal VSEN ) according to the first output voltage V OUT , and adjusts the voltage sensing signal VSEN according to the second output voltage V S to generate an adjusted voltage sensing signal V SEN (not shown in FIG. 1 ), and then generate a first control signal S1 according to the adjusted voltage sensing signal V SEN (not shown in FIG. 1 ), so that the power converter 103 is based on the first control signal S1 The second output voltage V S is controlled to be within a preset voltage range. When the second output voltage V S is within the preset voltage range, the control circuit 105 adjusts the adjusted voltage sensing signal V SEN according to the light source currents I 1 , I 2 , . . . , IN to generate a secondary The adjusted voltage sensing signal VSEN generates a second control signal S2 according to the secondary adjusted voltage sensing signal VSEN (not shown in FIG. 1 ), so that the power converter 103 controls the power converter 103 according to the second control signal S2 The light source currents I 1 , I 2 , . . . , IN are kept at target current values. In the present invention, the term "secondary conditioned" means that the signal is conditioned and the conditioned signal is subsequently conditioned, the term does not necessarily mean that the signal is conditioned only twice. The target current value and the preset voltage range are set by the user or specified by the designer. In one embodiment, the predetermined voltage range is 7V˜25V.

可見,該系統100可透過電能轉換器103調節第一輸出電壓VOUT,以使流過光源104的光源電流I1、I2、......、IN保持為目標電流值,減少功耗,提高功率效率。該系統100還可透過電能轉換器103調節第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內,以相容多種顯示器。 It can be seen that the system 100 can adjust the first output voltage V OUT through the power converter 103 , so that the light source currents I 1 , I 2 , . power consumption and improve power efficiency. The system 100 can also adjust the second output voltage V S through the power converter 103 , so that the second output voltage V S is within a predetermined voltage range, so as to be compatible with various displays.

第2圖係根據本發明另一個實施例的光源驅動系統200的電路圖。在一實施例中,第2圖為第1圖的實際應用電路圖。為簡化起見,光源驅動系統200中的一些元件沒有顯示在第2圖中。在本實施例中,該系統200包括電源VAC、整流器102、電能轉換器103、光源104、控制電路105、負載單元250及過壓保護單元260。其中,該控制電路105包括電壓監測電路210、控制器220、電壓感應電路230 及光耦合器240。 FIG. 2 is a circuit diagram of a light source driving system 200 according to another embodiment of the present invention. In one embodiment, FIG. 2 is an actual application circuit diagram of FIG. 1 . Some elements of the light source driving system 200 are not shown in FIG. 2 for simplicity. In this embodiment, the system 200 includes a power source V AC , a rectifier 102 , a power converter 103 , a light source 104 , a control circuit 105 , a load unit 250 and an overvoltage protection unit 260 . The control circuit 105 includes a voltage monitoring circuit 210 , a controller 220 , a voltage sensing circuit 230 and an optocoupler 240 .

該電壓監測電路210耦接於電能轉換器103,感應第二輸出電壓VS並產生指示第二輸出電壓VS的第一監測電壓V1和第二監測電壓V2。在一實施例中,電壓監測電路210包括相互串聯的電阻R5、電阻R6及電阻R7。電阻R5的一端連接電能轉換器103,以接收第二輸出電壓VS,另一端連接電阻R6的一端並形成節點N1,從而在節點N1上產生第一監測電壓V1。電阻R6的另一端連接電阻R7並形成節點N2,從而在節點N2上產生第二監測電壓V2。在本實施例中,V1=VS(R6+R7)/(R5+R6+R7),V2=VSR7/(R5+R6+R7)。其中R5,表示電阻R5的電阻值,R6表示電阻R6的電阻值,R7表示電阻R7的電阻值。 The voltage monitoring circuit 210 is coupled to the power converter 103 to sense the second output voltage V S and generate a first monitoring voltage V 1 and a second monitoring voltage V 2 indicating the second output voltage V S . In one embodiment, the voltage monitoring circuit 210 includes a resistor R5, a resistor R6, and a resistor R7 connected in series. One end of the resistor R5 is connected to the power converter 103 to receive the second output voltage V S , and the other end is connected to one end of the resistor R6 to form a node N1 , thereby generating the first monitoring voltage V 1 on the node N1 . The other end of the resistor R6 is connected to the resistor R7 and forms a node N2, thereby generating a second monitoring voltage V 2 on the node N2. In this embodiment, V 1 =V S (R 6 +R 7 )/(R 5 +R 6 +R 7 ), and V 2 =V S R 7 /(R 5 +R 6 +R 7 ). Among them, R 5 represents the resistance value of the resistor R5, R 6 represents the resistance value of the resistor R6, and R 7 represents the resistance value of the resistor R7.

控制器220分別耦接於光源104及電壓監測電路210,接收第一監測電壓V1、第二監測電壓V2及光源電流I1、I2、......、IN。第一監測電壓V1及第二監測電壓V2先於光源電流I1、I2、......、IN被接收到。控制器220產生指示第一監測電壓V1及第二監測電壓V2的第一調節電流IADJF1,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,控制器220產生指示光源電流I1、I2、......、IN與目標電流值之間差值的第二調節電流IADJF2,以使光源電流I1、I2、......、IN保持為目標電流值。 The controller 220 is coupled to the light source 104 and the voltage monitoring circuit 210 respectively, and receives the first monitoring voltage V 1 , the second monitoring voltage V 2 and the light source currents I 1 , I 2 , . . . , IN . The first monitoring voltage V 1 and the second monitoring voltage V 2 are received before the light source currents I 1 , I 2 , . . . , IN. The controller 220 generates a first adjustment current I ADJF1 indicating the first monitoring voltage V 1 and the second monitoring voltage V 2 , so that the second output voltage V S is within a predetermined voltage range. When the second output voltage V S is within the preset voltage range, the controller 220 generates a second adjustment current indicating the difference between the light source currents I 1 , I 2 , . . . , IN and the target current value I ADJF2 , so that the light source currents I 1 , I 2 , . . . , IN are kept at target current values.

該電壓感應電路230分別耦接於控制器220和電能轉換器103,並根據第一輸出電壓VOUT產生指示第一輸出電壓VOUT的電壓感應信號VSEN(未經調節的電壓感應信號VSEN)。第一調節電流IADJF1調節該電壓感應信號VSEN(未經調節的電壓感應信號VSEN)以產生調節後的電壓感應信號VSEN。第二調節電流IADJF2調節該調節後的電壓感應信號VSEN以產生二次調節後的電壓感應信號VSEN。如前,第一調節電流IADJF1指示第二輸出電壓VS及電壓感應信號VSEN(未經調節的電壓感應信號VSEN)指示第一輸出電壓VOUT。因此,第一調節電流IADJF1(IADJF1≠0)調節電壓感應信號VSEN(未經調節的電壓感應信號VSEN)之後,該調節後的電壓感應信 號VSEN指示第一輸出電壓VOUT與第二輸出電壓VS的結合。第一調節電流IADJF1(IADJF1=0)調節電壓感應信號VSEN(未經調節的電壓感應信號VSEN)之後,該調節後的電壓感應信號VSEN指示第一輸出電壓VOUTThe voltage sensing circuit 230 is coupled to the controller 220 and the power converter 103 respectively, and generates a voltage sensing signal VSEN (the unregulated voltage sensing signal VSEN ) indicating the first output voltage V OUT according to the first output voltage V OUT ). The first adjustment current I ADJF1 adjusts the voltage sensing signal VSEN (unadjusted voltage sensing signal VSEN ) to generate an adjusted voltage sensing signal VSEN . The second adjustment current I ADJF2 adjusts the adjusted voltage sensing signal V SEN to generate a second adjusted voltage sensing signal V SEN . As before, the first regulated current I ADJF1 indicates the second output voltage V S and the voltage sense signal V SEN (the unregulated voltage sense signal V SEN ) indicates the first output voltage V OUT . Therefore, after the first adjustment current I ADJF1 (I ADJF1 ≠0) adjusts the voltage sensing signal V SEN (the unadjusted voltage sensing signal V SEN ), the adjusted voltage sensing signal V SEN indicates that the first output voltage V OUT and the The combination of the second output voltage VS. After the first adjustment current I ADJF1 (I ADJF1 =0) adjusts the voltage sensing signal VSEN (the unadjusted voltage sensing signal VSEN ), the adjusted voltage sensing signal VSEN indicates the first output voltage V OUT .

第二調節電流IADJF2指示光源電流I1、I2、......、IN及調節後的電壓感應信號VSEN指示第一輸出電壓VOUT與第二輸出電壓VS的結合。因此,第二調節電流IADJF2(IADJF1≠0,IADJF2≠0)調節該調節後的電壓感應信號VSEN之後,該二次調節後的電壓感應信號VSEN指示第一輸出電壓VOUT、第二輸出電壓VS與光源電流I1、I2、......、IN的結合。第二調節電流IADJF2(IADJF1≠0,IADJF2=0)調節該調節後的電壓感應信號VSEN之後,該二次調節後的電壓感應信號VSEN指示第一輸出電壓VOUT與第二輸出電壓VS的結合。第二調節電流IADJF2指示光源電流I1、I2、......、IN及調節後的電壓感應信號VSEN指示第一輸出電壓VOUT。因此,第二調節電流IADJF2(IADJF1=0,IADJF2≠0)調節該調節後的電壓感應信號VSEN之後,該二次調節後的電壓感應信號VSEN指示第一輸出電壓VOUT與光源電流I1、I2、......、IN的結合。第二調節電流IADJF2(IADJF1=0,IADJF2=0)調節該調節後的電壓感應信號VSEN之後,該二次調節後的電壓感應信號VSEN指示第一輸出電壓VOUTThe second adjustment current I ADJF2 indicates the light source currents I 1 , I 2 , . . . , IN and the adjusted voltage sensing signal V SEN indicates the combination of the first output voltage V OUT and the second output voltage V S . Therefore, after the second adjustment current I ADJF2 (I ADJF1 ≠0, I ADJF2 ≠0) adjusts the adjusted voltage sensing signal V SEN , the second adjusted voltage sensing signal V SEN indicates the first output voltage V OUT , A combination of the second output voltage V S and the light source currents I 1 , I 2 , . . . , IN. After the second adjustment current I ADJF2 (I ADJF1 ≠0, I ADJF2 =0) adjusts the adjusted voltage sensing signal V SEN , the second adjusted voltage sensing signal V SEN indicates the first output voltage V OUT and the second The combination of the output voltage V S. The second adjustment current I ADJF2 indicates the light source currents I 1 , I 2 , . . . , IN and the adjusted voltage sensing signal V SEN indicates the first output voltage V OUT . Therefore, after the second adjustment current I ADJF2 (I ADJF1 =0, I ADJF2 ≠0) adjusts the adjusted voltage sensing signal V SEN , the second adjusted voltage sensing signal V SEN indicates that the first output voltage V OUT and the Combination of light source currents I 1 , I 2 , . . . , IN . After the second adjustment current I ADJF2 (I ADJF1 =0, I ADJF2 =0) adjusts the adjusted voltage sensing signal V SEN , the second adjusted voltage sensing signal V SEN indicates the first output voltage V OUT .

在一實施例中,電壓感應電路230為電阻R2和電阻R8組成的分壓器。電阻R8的一端連接電能轉換器103,以接收第一輸出電壓VOUT,另一端連接電阻R2並形成連接節點。在該連接節點上產生的電壓感應信號VSEN為電阻R2上的電壓值。第一調節電流IADJF1和第二調節電流IADJF2分別流入該連接節點或從該連接節點流出,從而引起電阻R2上的電壓值的變化。例如,在無第一調節電流IADJF1和第二調節電流IADJF2(IADJF1=0且IADJF2=0)時,電阻R2上的電壓值與第一輸出電壓VOUT成正比,例如,VSEN=VOUT.R2/(R2+R8)。其中,R2表示電阻R2的電阻值,R8表示電阻R8的電阻值。在第一調節電流IADJF1或第二調節電流IADJF2流入該連接節 點時,電阻R2上的電壓值增加。在第一調節電流IADJF1或第二調節電流IADJF2從該連接節點流出時,電阻R2上的電壓值減小。 In one embodiment, the voltage sensing circuit 230 is a voltage divider composed of a resistor R2 and a resistor R8. One end of the resistor R8 is connected to the power converter 103 to receive the first output voltage V OUT , and the other end is connected to the resistor R2 to form a connection node. The voltage sensing signal VSEN generated on the connection node is the voltage value on the resistor R2. The first adjustment current I ADJF1 and the second adjustment current I ADJF2 flow into or flow out from the connection node respectively, thereby causing the voltage value on the resistor R2 to change. For example, in the absence of the first adjustment current I ADJF1 and the second adjustment current I ADJF2 (I ADJF1 =0 and I ADJF2 =0), the voltage value on the resistor R2 is proportional to the first output voltage V OUT , for example, V SEN =V OUT . R 2 /(R 2 +R 8 ). Among them, R 2 represents the resistance value of the resistor R2, and R 8 represents the resistance value of the resistor R8. When the first adjustment current I ADJF1 or the second adjustment current I ADJF2 flows into the connection node, the voltage value on the resistor R2 increases. When the first adjustment current I ADJF1 or the second adjustment current I ADJF2 flows from the connection node, the voltage value on the resistor R2 decreases.

控制器220還根據電壓感應信號VSEN(可能是未經調節的電壓感應信號VSEN、調節後的電壓感應信號VSEN或二次調節後的電壓感應信號VSEN,本段下同)與電壓基準信號VREF(見第3圖)的比較結果產生控制電流ICMPO(可能是第一控制電流ICMPO1、第二控制電流ICMPO2或第三控制電流ICMPO3,本段下同)。該控制電流ICMPO流入控制器220中。具體地,當電壓感應信號VSEN大於電壓基準信號VREF時,控制器220產生的控制電流ICMPO減小;當電壓感應信號VSEN小於電壓基準信號VREF時,控制器220產生的控制電流ICMPO增加。 The controller 220 is also based on the voltage sensing signal VSEN (which may be the unregulated voltage sensing signal VSEN , the regulated voltage sensing signal VSEN or the secondary regulated voltage sensing signal VSEN , the same below in this paragraph) and the voltage. The comparison result of the reference signal V REF (see FIG. 3 ) generates the control current I CMPO (which may be the first control current I CMPO1 , the second control current I CMPO2 or the third control current I CMPO3 , the same below in this paragraph). The control current I CMPO flows into the controller 220 . Specifically, when the voltage sensing signal V SEN is greater than the voltage reference signal V REF , the control current I CMPO generated by the controller 220 decreases; when the voltage sensing signal V SEN is less than the voltage reference signal V REF , the control current generated by the controller 220 is reduced. I CMPO increases.

光耦合器240耦接於電能轉換器103,並根據控制電流ICMPO(可能是第一控制電流ICMPO1、第二控制電流ICMPO2或第三控制電流ICMPO3,本段下同)產生控制信號S(可能是第一控制信號S1、第二控制信號S2或第三控制信號S3,本段下同)。具體地,光耦合器240根據第一控制電流ICMPO1產生第一控制信號S1,根據第二控制電流ICMPO2產生第二控制信號S2,還根據第三控制電流ICMPO3產生第三控制信號S3。其中,電能轉換器103根據該第一控制信號S1調節第二輸出電壓VS以使第二輸出電壓VS處於預設電壓範圍內,或者根據該第二控制信號S2調節第一輸出電壓VOUT以使光源電流I1、I2、......、IN保持為目標電流值。電能轉換器103根據該第三控制信號S3調節第一輸出電壓VOUT以使第一輸出電壓VOUT等於電壓基準信號VREF所確定的目標電壓值VTARGET(具體情況將在下文詳細描述)。在一實施例中,光耦合器240是一種以光為媒介在兩個隔離電路之間傳輸電信號的元件。光耦合器240的等效電路包括LED和光電晶體管。LED的陽極透過電阻R4連接第二輸出電壓VS,陰極連線控制端CMPO。光電晶體管的射極接地,集極連接電能轉換器103,基極接收LED的光能。流過LED的控制電流ICMPO可使LED發光。光電晶體管接收LED發射的光並產生電信號。其中,該電信號可以是集射極電壓VCE 或集極電流IC。光電晶體根據LED的發光強度的變化控制其自身阻抗,進而改變集射極電壓VCE或集極電流IC。例如,當控制電流ICMPO增加,LED的發光強度增加,光電晶體管的阻抗減小,集射極電壓VCE增加而產生處於第二狀態的控制信號S(如,高電位)。當控制電流ICMPO減小時,LED的發光強度減小,光電晶體管的阻抗增加,集射極電壓VCE減小而產生處於第一狀態的控制信號S(如,低電位)。 The optocoupler 240 is coupled to the power converter 103 and generates a control signal according to the control current I CMPO (may be the first control current I CMPO1 , the second control current I CMPO2 or the third control current I CMPO3 , the same below in this paragraph) S (may be the first control signal S1, the second control signal S2 or the third control signal S3, the same below in this paragraph). Specifically, the optocoupler 240 generates the first control signal S1 according to the first control current I CMPO1 , the second control signal S2 according to the second control current I CMPO2 , and the third control signal S3 according to the third control current I CMPO3 . The power converter 103 adjusts the second output voltage V S according to the first control signal S1 so that the second output voltage V S is within a preset voltage range, or adjusts the first output voltage V OUT according to the second control signal S2 The light source currents I 1 , I 2 , . . . , IN are kept as target current values. The power converter 103 adjusts the first output voltage V OUT according to the third control signal S3 to make the first output voltage V OUT equal to the target voltage value V TARGET determined by the voltage reference signal V REF (the details will be described in detail below). In one embodiment, the optocoupler 240 is a component that transmits electrical signals between two isolated circuits using light as a medium. The equivalent circuit of optocoupler 240 includes LEDs and phototransistors. The anode of the LED is connected to the second output voltage V S through the resistor R4 , and the cathode is connected to the control terminal CMPO. The emitter of the phototransistor is grounded, the collector is connected to the power converter 103, and the base receives the light energy of the LED. The control current I CMPO flowing through the LED causes the LED to emit light. The phototransistor receives the light emitted by the LED and generates an electrical signal. The electrical signal may be the collector-emitter voltage V CE or the collector current I C . The phototransistor controls its own impedance according to the change of the luminous intensity of the LED, thereby changing the collector-emitter voltage V CE or the collector current I C . For example, when the control current I CMPO increases, the luminous intensity of the LED increases, the resistance of the phototransistor decreases, and the collector-emitter voltage V CE increases to generate the control signal S (eg, high potential) in the second state. When the control current I CMPO decreases, the luminous intensity of the LED decreases, the impedance of the phototransistor increases, and the collector-emitter voltage V CE decreases to generate the control signal S in the first state (eg, low potential).

電能轉換器103根據該處於第一狀態的控制信號S(如,低電位)減小第二輸出電壓VS和第一輸出電壓VOUT。或者,電能轉換器103根據該處於第二狀態的控制信號S(如,高電位)增加第二輸出電壓VS和第一輸出電壓VOUTThe power converter 103 reduces the second output voltage V S and the first output voltage V OUT according to the control signal S (eg, low level) in the first state. Alternatively, the power converter 103 increases the second output voltage V S and the first output voltage V OUT according to the control signal S (eg, high level) in the second state.

負載單元250連接於電能轉換器103和控制器220之間。該負載單元250在控制器220的控制下導通預設時間段,以減小第一輸出電壓VOUT。在一實施例中,負載單元250包括電阻R1和MOS(Metal-Oxide-Semiconductor,MOS)管M1。電阻R1的一端連接電能轉換器103,另一端連接MOS晶體M1的汲極。MOS晶體M1的源極接地,閘極連線控制器220。控制器220偵測到光源104被點亮時,控制MOS晶體M1導通預設時間段,則在該預設時間段內,第一輸出電壓VOUT經電阻R1分壓後而減小。此時減小後的第一輸出電壓VOUT不會導致光源104閃爍甚至燒壞。其中預設時間段是由設計者指定或使用者設定。 The load unit 250 is connected between the power converter 103 and the controller 220 . The load unit 250 is turned on for a predetermined period of time under the control of the controller 220 to reduce the first output voltage V OUT . In one embodiment, the load unit 250 includes a resistor R1 and a MOS (Metal-Oxide-Semiconductor, MOS) transistor M1. One end of the resistor R1 is connected to the power converter 103, and the other end is connected to the drain of the MOS crystal M1. The source of the MOS transistor M1 is grounded, and the gate is connected to the controller 220 . When the controller 220 detects that the light source 104 is turned on, the controller 220 controls the MOS transistor M1 to be turned on for a predetermined period of time, and within the predetermined period of time, the first output voltage V OUT is reduced after being divided by the resistor R1 . At this time, the reduced first output voltage V OUT will not cause the light source 104 to flicker or even burn out. The preset time period is designated by the designer or set by the user.

過壓保護單元260連接電能轉換器103,感應指示第一輸出電壓VOUT的第三監測電壓V3。控制器220根據該第三監測電壓V3執行保護操作,具體情況將在下文詳細描述。 The overvoltage protection unit 260 is connected to the power converter 103 and senses the third monitoring voltage V 3 indicating the first output voltage V OUT . The controller 220 performs a protection operation according to the third monitoring voltage V 3 , and the specific situation will be described in detail below.

在一實施例中,過壓保護單元260包括電阻R0和電阻R9。電阻R0的一端連接電能轉換器103,另一端連接電阻R9並形成節點N3。電阻R9的另一端接地。在節點N3上產生的第三監測電壓V3為電阻R9上的電壓值。在本實施例中,V3=VOUT.R9/(R0+R9)。其中R0,表示電阻R0的電阻值,R9表示電阻R9的電阻值。 In one embodiment, the overvoltage protection unit 260 includes a resistor R0 and a resistor R9. One end of the resistor R0 is connected to the power converter 103, and the other end is connected to the resistor R9 to form a node N3. The other end of resistor R9 is connected to ground. The third monitoring voltage V3 generated on the node N3 is the voltage value on the resistor R9. In this embodiment, V 3 =V OUT . R 9 / (R 0 +R 9 ). Among them, R 0 represents the resistance value of the resistor R0 , and R 9 represents the resistance value of the resistor R9 .

第3圖係根據本發明一個實施例的控制器220的電路圖。在一實施例中,控制器220包括電壓檢測端311、電流檢測端312、調節端ADJE、電壓感應端VSEN、控制端CMPO、過壓保護端OVP、脈衝寬度調變端PWM、使能端ENA、負載端LOAD、比較與回饋電路310、電流感應與均衡電路320、並聯調節器330及驅動器340。 FIG. 3 is a circuit diagram of the controller 220 according to one embodiment of the present invention. In one embodiment, the controller 220 includes a voltage detection terminal 311, a current detection terminal 312, an adjustment terminal ADJE, a voltage sensing terminal VSEN, a control terminal CMPO, an overvoltage protection terminal OVP, a pulse width modulation terminal PWM, and an enable terminal ENA. , the load terminal LOAD, the comparison and feedback circuit 310 , the current sensing and equalization circuit 320 , the parallel regulator 330 and the driver 340 .

該電壓檢測端311耦合於該系統200中的電壓監測電路210。該電壓偵測端311感應該電能轉換器103產生的對該系統200中除光源104以外的元件供電的第二輸出電壓VSThe voltage detection terminal 311 is coupled to the voltage monitoring circuit 210 in the system 200 . The voltage detection terminal 311 senses the second output voltage V S generated by the power converter 103 for powering the components in the system 200 except the light source 104 .

在一實施例中,該電壓檢測端311包括高箝位端HCP及低箝位端LCP。低箝位端LCP連接電壓監測電路210中的節點N1,以接收指示第二輸出電壓VS的第一監測電壓V1。高箝位端HCP連接電壓監測電路210中的節點N2,以接收指示第二輸出電壓VS的第二監測電壓V2In one embodiment, the voltage detection terminal 311 includes a high clamp terminal HCP and a low clamp terminal LCP. The low clamp terminal LCP is connected to the node N1 in the voltage monitoring circuit 210 to receive the first monitoring voltage V 1 indicative of the second output voltage V S . The high clamp terminal HCP is connected to the node N2 in the voltage monitoring circuit 210 to receive the second monitoring voltage V 2 indicative of the second output voltage V S .

該電流檢測端312耦合於光源104,感應流過光源104的光源電流I1、I2、......、IN。在一實施例中,該電流檢測端312包括電流檢測端ISEN1、ISEN2、......、ISENN。電流檢測端ISENj(j=1,2,......,N)耦接於LED串Sj。電流檢測端ISENj感應流過LED串Sj的光源電流Ij,j=1,2,......,N。其中,該電壓檢測端311的優先順序高於電流檢測端312。也就是說,第二輸出電壓VS先於光源電流I1、I2、......、IN被感應到。控制器220先根據第二輸出電壓VS產生指示第二輸出電壓VS的第一調節電流IADJF1,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,電流檢測端312再感應到光源電流I1、I2、......、INThe current detection terminal 312 is coupled to the light source 104 and senses the light source currents I 1 , I 2 , . . . , IN flowing through the light source 104 . In one embodiment, the current detection terminal 312 includes current detection terminals ISEN1 , ISEN2 , . . . , ISENN. The current detection terminal ISENj (j=1, 2, ..., N) is coupled to the LED string Sj. The current detection terminal ISENj senses the light source current I j flowing through the LED string Sj, j=1, 2, ......, N. The priority of the voltage detection terminal 311 is higher than that of the current detection terminal 312 . That is, the second output voltage V S is sensed before the light source currents I 1 , I 2 , . . . , IN . The controller 220 first generates a first adjustment current I ADJF1 indicating the second output voltage V S according to the second output voltage V S , so that the second output voltage V S is within a predetermined voltage range. When the second output voltage V S is within the preset voltage range, the current detection terminal 312 senses the light source currents I 1 , I 2 , . . . , I N again.

該脈波寬度調變端PWM接收指示光源104預設亮度的調光信號。在一實施例中,調光信號包括具有高電位和低電位的矩形波信號。例如,預設亮度為總亮度的100%時,調光信號呈高電位。預設亮度為總亮度的0%時,調光信 號呈低電位。預設亮度處於總亮度的0%至100%之間時,調光信號由高低電位組成的矩形波信號。 The pulse width modulation terminal PWM receives a dimming signal indicating the preset brightness of the light source 104 . In one embodiment, the dimming signal includes a square wave signal having a high potential and a low potential. For example, when the preset brightness is 100% of the total brightness, the dimming signal is at a high level. When the preset brightness is 0% of the total brightness, the dimming signal The signal is low potential. When the preset brightness is between 0% and 100% of the total brightness, the dimming signal is a rectangular wave signal composed of high and low potentials.

電流感應與均衡電路320耦接於電流檢測端ISEN1、ISEN2、......、ISENN和脈波寬度調變端PWM。電流感應與均衡電路320根據指示光源104預設亮度的調光信號控制與光源104耦接的多個MOS晶體(如,第3圖中的MOS晶體Q1、Q2、......、QN)的工作模式並均衡光源電流I1、I2、......、IN,還根據光源電流I1、I2、......、IN產生電流回饋信號SISENThe current sensing and equalization circuit 320 is coupled to the current detection terminals ISEN1 , ISEN2 , . . . , ISENN and the pulse width modulation terminal PWM. The current sensing and equalization circuit 320 controls a plurality of MOS crystals coupled to the light source 104 according to the dimming signal indicating the preset brightness of the light source 104 (eg, the MOS crystals Q 1 , Q 2 , . . . , Q N ) and equalize the light source currents I 1 , I 2 , ..., I N , and also generate a current feedback signal according to the light source currents I 1 , I 2 , ..., I N S ISEN .

其中,多個MOS晶體(如,第3圖中的MOS晶體Q1、Q2、......、QN)的工作模式包括線性模式和開關模式。當預設亮度處於第一亮度範圍時,電流感應與均衡電路320控制多個MOS晶體工作在線性模式。當預設亮度處於第二亮度範圍時,電流感應與均衡電路320控制多個MOS晶體工作在開關模式。其中,第一亮度範圍和第二亮度範圍均由使用者或設計者設計或指定。具體情況將在下文詳細描述。根據預設亮度控制多個MOS晶體的工作模式可最大程度上減少在該多個MOS晶體(如,MOS晶體Q1、Q2、......、QN)上的功耗,提高功率效率。 The operating modes of the plurality of MOS crystals (eg, the MOS crystals Q 1 , Q 2 , . . . , Q N in FIG. 3 ) include a linear mode and a switching mode. When the preset brightness is within the first brightness range, the current sensing and equalization circuit 320 controls the plurality of MOS crystals to operate in a linear mode. When the preset brightness is within the second brightness range, the current sensing and equalization circuit 320 controls the plurality of MOS crystals to work in a switch mode. The first brightness range and the second brightness range are both designed or specified by the user or the designer. The specific situation will be described in detail below. Controlling the operating modes of the multiple MOS crystals according to the preset brightness can minimize the power consumption on the multiple MOS crystals (eg, the MOS crystals Q 1 , Q 2 , . . . , Q N ), and improve the power efficiency.

在一實施例中,該電流感應與均衡電路320包括選擇器321、開關控制單元322、積分電路323、比較器EA6等(具體電路及連接關係請參考第3圖)。在第3圖中,感應電阻RS1、RS2、......、RSN的電阻值均相同。根據第3圖可得到:流過每個LED串的光源電流Ij=(VOUT-VFj)/RS (1)其中,VFj表示LED串Sj上的光源電壓,RS表示感應電阻RSj上的電阻值。由於每個LED串的情況(如LED數量、阻值、環境溫度等)不同,LED串S1、S2、......、SN上的光源電壓VF1、VF2、......、VFN的大小也不同。可見,流過每一個LED串的光源電流Ij的大小可能均不相同甚至相差較大。於是,該電流感應與均衡電路320根據指示光源104預設亮度的調光信號控制多個MOS晶體(如,MOS晶體Q1、 Q2、......、QN)的工作模式並均衡各光源電流I1、I2、......、IN,以使各光源電流I1、I2、......、IN的大小基本相同。 In one embodiment, the current sensing and equalization circuit 320 includes a selector 321 , a switch control unit 322 , an integrating circuit 323 , a comparator EA6 , and the like (please refer to FIG. 3 for the specific circuit and connection relationship). In Fig. 3, the resistance values of the sensing resistors R S1 , R S2 , . . . , R SN are all the same. According to Figure 3, it can be obtained: the light source current I j flowing through each LED string =(V OUT -V Fj )/R S (1) where V Fj represents the light source voltage on the LED string Sj, and R S represents the sensing resistor Resistor value on R Sj . Due to the different conditions of each LED string (such as the number of LEDs, resistance value, ambient temperature, etc.), the light source voltages V F1 , V F2 , ..... ., the size of V FN is also different. It can be seen that the magnitude of the light source current I j flowing through each LED string may be different or even have a large difference. Therefore, the current sensing and equalization circuit 320 controls the working modes of a plurality of MOS crystals (eg, MOS crystals Q 1 , Q 2 , . . . , Q N ) according to the dimming signal indicating the preset brightness of the light source 104 and The light source currents I 1 , I 2 , . . . , IN are balanced so that the magnitudes of the light source currents I 1 , I 2 , .

在一實施例中,當預設亮度處於第一亮度範圍(比如總亮度的60%~100%)時,積分電路323對該調光信號進行積分而產生電壓信號V5。其中,在一實施例中,調光信號所指示的預設亮度為總亮度的60%時,電壓信號V5的電壓值為1.8V;調光信號所指示的預設亮度為總亮度的100%時,電壓信號V5的電壓值為3V。換句話說,調光信號所指示的預設亮度為總亮度的60%到100%時,電壓信號V5的電壓值介於1.8V到3V之間。如果比較器EA6比較出電壓信號V5的電壓值大於等於預設電壓值V4(例如,V4=1.8V)後,則可確定調光信號所指示的預設亮度介於總亮度的60%到100%之間,於是開關控制單元322控制開關S11、S12、......、S1N導通,開關S21、S22、......、S2N斷開。在本段所描述的情況下,MOS晶體Q1、Q2、......、QN工作線上性模式。 In one embodiment, when the preset brightness is in the first brightness range (eg, 60%˜100% of the total brightness), the integrating circuit 323 integrates the dimming signal to generate the voltage signal V 5 . Wherein, in one embodiment, when the preset brightness indicated by the dimming signal is 60% of the total brightness, the voltage value of the voltage signal V5 is 1.8V; the preset brightness indicated by the dimming signal is 100% of the total brightness %, the voltage value of the voltage signal V5 is 3V. In other words, when the preset brightness indicated by the dimming signal is 60% to 100% of the total brightness, the voltage value of the voltage signal V 5 is between 1.8V and 3V. If the comparator EA6 compares that the voltage value of the voltage signal V 5 is greater than or equal to the preset voltage value V 4 (for example, V 4 =1.8V), it can be determined that the preset brightness indicated by the dimming signal is between 60% of the total brightness % to 100%, then the switch control unit 322 controls the switches S 11 , S 12 , ..., S 1N to be turned on, and the switches S 21 , S 22 , ..., S 2N to be turned off. In the case described in this paragraph, the MOS transistors Q 1 , Q 2 , . . . , Q N work in linear mode.

線性模式下,MOS晶體Q1、Q2、......、QN的阻抗連續可調。緩衝器BFj一端連接感應電阻RSj,以接收感應電阻RSj上的感應電壓VSj(j=1,2,......,N),另一端連接基準信號產生器(第3圖未標出),以接收基準信號產生器產生的均衡基準電壓。當感應電壓VSj大於均衡基準電壓時,緩衝器BFj施加在MOS晶體Qj閘極上的電壓減小,MOS晶體Qj上的阻抗RQj增加,從而減小光源電流Ij,j=1,2,......,N。當感應電壓VSj小於均衡基準電壓時,緩衝器BFj施加在MOS晶體Qj閘極上的電壓增加,MOS晶體Qj上的阻抗RQj減小,從而增加光源電流Ij。其中,均衡基準電壓可以是指示光源電流I1、I2、......、IN的平均電流值,本發明不做限定。 In the linear mode, the impedances of the MOS crystals Q 1 , Q 2 , ..., Q N are continuously adjustable. One end of the buffer BF j is connected to the sensing resistor R Sj to receive the induced voltage V Sj (j=1, 2, . . . , N) on the sensing resistor R Sj , and the other end is connected to the reference signal generator (third not shown) to receive the balanced reference voltage generated by the reference signal generator. When the induced voltage V Sj is greater than the equilibrium reference voltage, the voltage applied by the buffer BF j to the gate of the MOS crystal Q j decreases, and the impedance R Qj on the MOS crystal Q j increases, thereby reducing the light source current I j , j=1 , 2, ..., N. When the induced voltage V Sj is less than the equilibrium reference voltage, the voltage applied by the buffer BF j to the gate of the MOS crystal Q j increases, and the impedance R Qj on the MOS crystal Q j decreases, thereby increasing the light source current I j . The balanced reference voltage may be an average current value indicating the light source currents I 1 , I 2 , . . . , IN, which is not limited in the present invention.

另外,選擇器321根據指示均衡後的光源電流

Figure 110112457-A0305-02-0014-1
Figure 110112457-A0305-02-0014-2
、......、
Figure 110112457-A0305-02-0014-3
對應的指示電壓VIN1、VIN2、......、VINN選擇電流回饋信號SISEN。其中,指示電壓
Figure 110112457-A0305-02-0014-4
從(1)(2)兩式可得到指示電壓VINj越小,對應的光源電流Ij也越小。在一實施例中,電流回饋信號SISEN為指示電壓VIN1、IIN2、......、IINN中的最小值。 In addition, the selector 321 indicates the equalized light source current according to the
Figure 110112457-A0305-02-0014-1
,
Figure 110112457-A0305-02-0014-2
,......,
Figure 110112457-A0305-02-0014-3
The corresponding indicated voltages V IN1 , V IN2 , . . . , V INN select the current feedback signal S ISEN . Among them, the indicated voltage
Figure 110112457-A0305-02-0014-4
From the formulas (1) and (2), it can be obtained that the smaller the indicated voltage V INj is , the smaller the corresponding light source current Ij is. In one embodiment, the current feedback signal S ISEN is the minimum value among the indicated voltages V IN1 , I IN2 , . . . , I INN .

在一實施例中,當預設亮度處於第二亮度範圍(比如總亮度的10%~60%)時,積分電路323對該調光信號進行積分而產生電壓信號V5。其中,在一實施例中,調光信號所指示的預設亮度為總亮度的60%時,電壓信號V5的電壓值為1.8V;調光信號所指示的預設亮度為總亮度的10%時,電壓信號V5的電壓值為0.3V。換句話說,調光信號所指示的預設亮度為總亮度的10%到60%時,電壓信號V5的電壓值介於0.3V到1.8V之間。如果比較器EA6比較出電壓信號V5的電壓值小於預設電壓值V4(例如,V4=1.8V)後,則可確定調光信號所指示的預設亮度介於總亮度的10%到60%之間,於是開關控制單元322控制開關S11、S12、......、S1N斷開,開關S21、S22、......、S2N導通。在本段所描述的情況下,MOS晶體Q1,Q2,......、QN工作在開關模式。 In one embodiment, when the preset brightness is within the second brightness range (eg, 10%˜60% of the total brightness), the integrating circuit 323 integrates the dimming signal to generate the voltage signal V 5 . Wherein, in one embodiment, when the preset brightness indicated by the dimming signal is 60% of the total brightness, the voltage value of the voltage signal V5 is 1.8V; the preset brightness indicated by the dimming signal is 10% of the total brightness %, the voltage value of the voltage signal V5 is 0.3V. In other words, when the preset brightness indicated by the dimming signal is 10% to 60% of the total brightness, the voltage value of the voltage signal V 5 is between 0.3V and 1.8V. If the comparator EA6 compares that the voltage value of the voltage signal V 5 is smaller than the preset voltage value V 4 (for example, V 4 =1.8V), it can be determined that the preset brightness indicated by the dimming signal is between 10% of the total brightness to 60%, then the switch control unit 322 controls the switches S 11 , S 12 , . . . , S 1N to be turned off, and the switches S 21 , S 22 , . In the situation described in this paragraph, the MOS transistors Q 1 , Q 2 , . . . , Q N operate in switching mode.

開關模式下,MOS晶體Q1、Q2、......、QN可被完全導通或斷開。當感應電壓VSj大於均衡基準電壓時,信號產生器PWMj減小信號PWMj′的責任週期,MOS晶體Qj被完全導通的時間減小,從而減小光源電流Ij,j=1,2,......,N。當感應電壓VSj小於均衡基準電壓時,信號產生器PWMj增加信號PWMj′的責任週期,MOS晶體Qj被完全導通的時間增加,從而增加光源電流Ij。信號PWMj的責任週期是指在一個週期內,高電位持續的時間與該週期時間的比率。其中,該高電位持續的時間為MOS晶體Qj被完全導通的時間。其中,均衡基準電壓可以是指示光源電流I1、I2、......、IN的平均電流值,本發明不做限定。 In the switching mode, the MOS transistors Q 1 , Q 2 , . . . , Q N can be fully turned on or off. When the induced voltage V Sj is greater than the equilibrium reference voltage, the signal generator PWMj reduces the duty cycle of the signal PWMj', and the time when the MOS crystal Q j is fully turned on is reduced, thereby reducing the light source current I j , j=1, 2, ..., N. When the induced voltage V Sj is less than the equilibrium reference voltage, the signal generator PWMj increases the duty cycle of the signal PWMj', and the time when the MOS crystal Q j is fully turned on increases, thereby increasing the light source current I j . The duty cycle of the signal PWMj refers to the ratio of the duration of the high potential to the cycle time in one cycle. The duration of the high potential is the time when the MOS crystal Q j is completely turned on. The balanced reference voltage may be an average current value indicating the light source currents I 1 , I 2 , . . . , IN, which is not limited in the present invention.

另外,該光源電流I1、I2、......、IN在均衡前,選擇器321根據感應電阻RS1、RS2、......、RSN上的感應電壓VS1、VS2、......、VSN選擇電流回饋信號SISEN。在一實施例中,電流回饋信號SISEN為感應電壓VS1、VS2、......、VSN中的最小值。 In addition, before the light source currents I 1 , I 2 , . S1 , V S2 , . . . , V SN select the current feedback signal S ISEN . In one embodiment, the current feedback signal S ISEN is the minimum value among the induced voltages V S1 , V S2 , . . . , V SN .

該比較與回饋電路310耦接於電壓檢測端311和電流感應與均衡電 路320。該比較與回饋電路310先產生指示第二輸出電壓VS的第一調節電流IADJF1,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,該比較與回饋電路310再根據光源電流I1、I2、......、IN與目標電流值之間的差值產生第二調節電流IADJF2,以使光源電流I1、I2、......、IN保持為目標電流值。第一調節電流IADJF1先於第二調節電流IADJF2產生。 The comparison and feedback circuit 310 is coupled to the voltage detection terminal 311 and the current sensing and equalization circuit 320 . The comparison and feedback circuit 310 first generates a first adjustment current I ADJF1 indicative of the second output voltage V S so that the second output voltage V S is within a predetermined voltage range. When the second output voltage V S is within the preset voltage range, the comparison and feedback circuit 310 is generated according to the difference between the light source currents I 1 , I 2 , . . . , I N and the target current value The second adjustment current I ADJF2 keeps the light source currents I 1 , I 2 , . . . , IN at the target current value. The first adjustment current IADJF1 is generated before the second adjustment current IADJF2 .

具體地,比較與回饋電路310分別耦接於高箝位端HCP、低箝位端LCP及電流感應與均衡電路320。由於第一監測電壓V1和第二監測電壓V2均先於光源電流I1、I2、......、IN被接收到,因此該比較與回饋電路310先根據第一監測電壓V1與低電壓臨限值VSL的關係及第二監測電壓V2與高電壓臨限值VSH的關係產生第一調節電流IADJF1,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,該比較與回饋電路310再根據指示光源電流I1、I2、......、IN的電流回饋信號SISEN與指示目標電流值的電流基準信號SADJ之間的差值產生第二調節電流IADJF2,以使光源電流I1、I2、......、IN保持為目標電流值。其中,低電壓臨限值VSL和高電壓臨限值VSH由基準信號產生器(第3圖未標出)產生。 Specifically, the comparison and feedback circuit 310 is respectively coupled to the high clamp terminal HCP, the low clamp terminal LCP and the current sensing and equalization circuit 320 . Since both the first monitoring voltage V 1 and the second monitoring voltage V 2 are received before the light source currents I 1 , I 2 , . . . , IN, the comparison and feedback circuit 310 first monitors the The relationship between the voltage V 1 and the low voltage threshold value V SL and the relationship between the second monitoring voltage V 2 and the high voltage threshold value V SH generate the first adjustment current I ADJF1 , so that the second output voltage V S is at the preset voltage within the range. When the second output voltage V S is within the preset voltage range, the comparison and feedback circuit 310 then feeds back the current feedback signal S ISEN indicating the light source currents I 1 , I 2 , . . . , IN and the indication target according to the current feedback signal S ISEN The difference between the current reference signals SADJ of the current values generates the second adjustment current I ADJF2 to keep the light source currents I 1 , I 2 , . . . , IN at the target current value. Among them, the low voltage threshold value V SL and the high voltage threshold value V SH are generated by a reference signal generator (not shown in Figure 3).

在一實施例中,VSL=VTH1.(R6+R7)/(R5+R6+R7),VSH=VTH2.R7/(R5+R6+R7),其中,VTH1為第二輸出電壓VS的預設電壓範圍中的最小電壓值,VTH2為第二輸出電壓VS的預設電壓範圍中的最大電壓值。低電壓臨限值VSL和高電壓臨限值VSH的取值並不限於本發明公開的實施例,只要根據第一監測電壓V1與低電壓臨限值VSL的關係及第二監測電壓V2與高電壓臨限值VSH的關係能夠確定第二輸出電壓VS所處的電壓範圍即可。 In one embodiment, V SL =V TH1 . (R 6 +R 7 )/(R 5 +R 6 +R 7 ), V SH =V TH2 . R 7 /(R 5 +R 6 +R 7 ), wherein V TH1 is the minimum voltage value in the preset voltage range of the second output voltage V S , and V TH2 is the preset voltage range of the second output voltage V S the maximum voltage value in . The values of the low voltage threshold value V SL and the high voltage threshold value V SH are not limited to the embodiments disclosed in the present invention, as long as the relationship between the first monitoring voltage V 1 and the low voltage threshold value V SL and the second monitoring The relationship between the voltage V 2 and the high voltage threshold value V SH can determine the voltage range in which the second output voltage V S is located.

在一實施例中,比較與回饋電路310包括比較器EA1、比較器EA2、比較器EA3、比較器EA4、第一邏輯電路313、第二邏輯電路314及轉換單元315。比較器EA1的非反相輸入端接收低電壓臨限值VSL,反相輸入端耦接於低箝位端LCP,以接收第一監測電壓V1,比較器EA1輸出端輸出根據第一監測電壓V1和低 電壓臨限值VSL產生的第一比較結果。當第一監測電壓V1不低於低電壓臨限值VSL時,第一比較結果為低電位;當第一監測電壓V1低於低電壓臨限值VSL時,第一比較結果為高電位。 In one embodiment, the comparison and feedback circuit 310 includes a comparator EA1 , a comparator EA2 , a comparator EA3 , a comparator EA4 , a first logic circuit 313 , a second logic circuit 314 and a conversion unit 315 . The non-inverting input terminal of the comparator EA1 receives the low voltage threshold value V SL , the inverting input terminal is coupled to the low clamping terminal LCP to receive the first monitoring voltage V 1 , and the output terminal of the comparator EA1 outputs the output according to the first monitoring voltage V 1 . The voltage V1 and the low voltage threshold VSL produce a first comparison result. When the first monitoring voltage V 1 is not lower than the low voltage threshold value V SL , the first comparison result is a low potential; when the first monitoring voltage V 1 is lower than the low voltage threshold value V SL , the first comparison result is high potential.

比較器EA2的非反相輸入端耦接於高箝位端HCP,以接收第二監測電壓V2,反相輸入端接收高電壓臨限值VSH,比較器EA2輸出端輸出根據第二監測電壓V2和高電壓臨限值VSH產生的第二比較結果。當第二監測電壓V2不高於高電壓臨限值VSH時,第二比較結果為低電位;當第二監測電壓V2高於高電壓臨限值VSH,第二比較結果為高電位。 The non-inverting input terminal of the comparator EA2 is coupled to the high clamp terminal HCP to receive the second monitoring voltage V 2 , the inverting input terminal receives the high voltage threshold value V SH , and the output terminal of the comparator EA2 outputs according to the second monitoring voltage The second result of the comparison is the voltage V2 and the high voltage threshold VSH . When the second monitoring voltage V 2 is not higher than the high voltage threshold value V SH , the second comparison result is a low level; when the second monitoring voltage V 2 is higher than the high voltage threshold value V SH , the second comparison result is high potential.

比較器EA3的非反相輸入端設置有電流基準信號SADJ(基準信號產生器(第3圖未標出)產生的),反相輸入端耦接於電流感應與均衡電路320,以接收電流回饋信號SISEN,比較器EA3輸出端輸出根據電流基準信號SADJ和電流回饋信號SISEN產生的第三比較結果。例如,當電流基準信號SADJ大於電流回饋信號SISEN時,第三比較結果為高電位。當電流基準信號SADJ不大於電流回饋信號SISEN時,第三比較結果為低電位。在一實施例中,電流基準信號SADJ指示光源電流I1、I2、......、IN的目標電流值。 The non-inverting input terminal of the comparator EA3 is provided with the current reference signal S ADJ (generated by the reference signal generator (not shown in Figure 3)), and the inverting input terminal is coupled to the current sensing and equalizing circuit 320 to receive current For the feedback signal S ISEN , the output end of the comparator EA3 outputs the third comparison result generated according to the current reference signal S ADJ and the current feedback signal S ISEN . For example, when the current reference signal S ADJ is greater than the current feedback signal S ISEN , the third comparison result is a high level. When the current reference signal S ADJ is not greater than the current feedback signal S ISEN , the third comparison result is a low level. In one embodiment, the current reference signal SADJ indicates the target current value of the light source currents I 1 , I 2 , . . . , IN .

比較器EA4的非反相輸入端耦接於電流感應與均衡電路320,以接收電流回饋信號SISEN,反相輸入端設置有電流基準信號SADJ,比較器EA4輸出端輸出根據電流基準信號SADJ和電流回饋信號SISEN產生的第四比較結果。例如,當電流回饋信號SISEN大於電流基準信號SADJ時,第四比較結果為高電位。當電流回饋信號SISEN不大於電流基準信號SADJ時,第四比較結果為低電位。 The non-inverting input terminal of the comparator EA4 is coupled to the current sensing and equalizing circuit 320 to receive the current feedback signal S ISEN , the inverting input terminal is provided with the current reference signal S ADJ , and the output terminal of the comparator EA4 outputs the current reference signal S according to the current reference signal S A fourth comparison result is generated by ADJ and the current feedback signal S ISEN . For example, when the current feedback signal S ISEN is greater than the current reference signal S ADJ , the fourth comparison result is a high level. When the current feedback signal S ISEN is not greater than the current reference signal S ADJ , the fourth comparison result is a low level.

第一邏輯電路313耦接於比較器EA1的輸出端,接收第一比較結果並選擇性地輸出第一加法信號。例如,當第一比較結果為高電位時,第一邏輯電路313輸出第一加法信號。第一邏輯電路313還耦接於比較器EA3的輸出端,接收第三比較結果並選擇性地輸出第二加法信號。例如,當第三比較結果為高電 位時,第一邏輯電路313輸出第二加法信號。由於第一監測電壓V1先於光源電流I1、I2、......、IN被接收,則第一比較結果先於第三比較結果被輸出。也就是說,第一比較結果先於第三比較結果被接收。於是,第一邏輯電路313優先接收第一比較結果並根據第一比較結果選擇性地輸出第一加法信號,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,第一邏輯電路313再接收第三比較結果並根據第三比較結果選擇性地輸出第二加法信號。 The first logic circuit 313 is coupled to the output end of the comparator EA1, receives the first comparison result and selectively outputs the first addition signal. For example, when the first comparison result is a high level, the first logic circuit 313 outputs the first addition signal. The first logic circuit 313 is further coupled to the output end of the comparator EA3, receives the third comparison result and selectively outputs the second addition signal. For example, when the third comparison result is high, the first logic circuit 313 outputs the second addition signal. Since the first monitoring voltage V 1 is received before the light source currents I 1 , I 2 , . . . , IN, the first comparison result is output before the third comparison result. That is, the first comparison result is received before the third comparison result. Therefore, the first logic circuit 313 preferentially receives the first comparison result and selectively outputs the first addition signal according to the first comparison result, so that the second output voltage V S is within the preset voltage range. When the second output voltage V S is within the preset voltage range, the first logic circuit 313 receives the third comparison result and selectively outputs the second addition signal according to the third comparison result.

第二邏輯電路314耦接於比較器EA2的輸出端,接收第二比較結果並選擇性地輸出第一減法信號。例如,當第二比較結果為高電位時,第二邏輯電路314輸出第一減法信號。第二邏輯電路314還耦接於比較器EA4的輸出端,接收第四比較結果並選擇性地輸出第二減法信號。例如,當第四比較結果為高電位時,第二邏輯電路314輸出第二減法信號。由於第二監測電壓V2先於光源電流I1、I2、......、IN被接收,則第二比較結果先於第四比較結果被輸出。也就是說,第二比較結果先於第四比較結果被接收。於是,第二邏輯電路314優先接收第二比較結果並根據第二比較結果選擇性地輸出第一減法信號,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,第二邏輯電路314再接收第四比較結果並根據第四比較結果選擇性地輸出第二減法信號。 The second logic circuit 314 is coupled to the output end of the comparator EA2, receives the second comparison result and selectively outputs the first subtraction signal. For example, when the second comparison result is high, the second logic circuit 314 outputs the first subtraction signal. The second logic circuit 314 is further coupled to the output terminal of the comparator EA4, receives the fourth comparison result and selectively outputs the second subtraction signal. For example, when the fourth comparison result is high, the second logic circuit 314 outputs the second subtraction signal. Since the second monitoring voltage V 2 is received before the light source currents I 1 , I 2 , . . . , IN, the second comparison result is output before the fourth comparison result. That is, the second comparison result is received before the fourth comparison result. Therefore, the second logic circuit 314 preferentially receives the second comparison result and selectively outputs the first subtraction signal according to the second comparison result, so that the second output voltage V S is within the preset voltage range. When the second output voltage V S is within the preset voltage range, the second logic circuit 314 receives the fourth comparison result and selectively outputs the second subtraction signal according to the fourth comparison result.

轉換單元315耦接於第一邏輯電路313和第二邏輯電路314。由於第一監測電壓V1和第二監測電壓V2均先於光源電流I1、I2、......、IN被接收,則第一加法信號和第一減法信號均先於第二加法信號和第二減法信號被輸出。於是,轉換單元315先根據第一加法信號或第一減法信號產生第一調節電流IADJF1,以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,轉換單元315再根據第二加法信號或第二減法信號產生第二調節電流IADJF2,以使光源電流I1、I2、......、IN保持為目標電流值。根據第一加法信號,第一調節電流IADJF1從電壓感應電路230流入轉換單元315以減小電壓感應信號VSEN。根據第一減 法信號,第一調節電流IADJF1從轉換單元315流入電壓感應電路230以增加電壓感應信號VSEN。根據第二加法信號,第二調節電流IADJF2從電壓感應電路230流入轉換單元315以減小調節後的電壓感應信號VSEN。根據第二減法信號,第二調節電流IADJF2從轉換單元315流入電壓感應電路230以增加調節後的電壓感應信號VSEN。在一實施例中,該第二調節電流IADJF2指示電流回饋信號SISEN與電流基準信號SADJ之間的差值。 The conversion unit 315 is coupled to the first logic circuit 313 and the second logic circuit 314 . Since both the first monitoring voltage V 1 and the second monitoring voltage V 2 are received before the light source currents I 1 , I 2 , . . . , IN, the first addition signal and the first subtraction signal are both received before The second addition signal and the second subtraction signal are output. Therefore, the conversion unit 315 firstly generates the first adjustment current I ADJF1 according to the first addition signal or the first subtraction signal, so that the second output voltage V S is within the preset voltage range. When the second output voltage V S is within the preset voltage range, the conversion unit 315 generates a second adjustment current I ADJF2 according to the second addition signal or the second subtraction signal, so that the light source currents I 1 , I 2 , . . . ..., IN remains at the target current value. According to the first addition signal, the first adjustment current I ADJF1 flows from the voltage sensing circuit 230 into the converting unit 315 to reduce the voltage sensing signal V SEN . According to the first subtraction signal, the first adjustment current I ADJF1 flows from the conversion unit 315 into the voltage sensing circuit 230 to increase the voltage sensing signal V SEN . According to the second addition signal, the second adjustment current I ADJF2 flows from the voltage sensing circuit 230 into the converting unit 315 to reduce the adjusted voltage sensing signal V SEN . According to the second subtraction signal, the second adjustment current I ADJF2 flows from the conversion unit 315 into the voltage sensing circuit 230 to increase the adjusted voltage sensing signal V SEN . In one embodiment, the second adjustment current IADJF2 indicates the difference between the current feedback signal S ISEN and the current reference signal S ADJ .

在一實施例中,轉換單元315包括暫存器和數模轉換器。暫存器以數位信號的形式存儲該第一加法信號、第二加法信號、第一減法信號及第二減法信號。數模轉換器根據該數位信號形式的第一加法信號或第一減法信號產生第一調節電流IADJF1。數模轉換器還根據該數位信號形式的第二加法信號或第二減法信號產生第二調節電流IADJF2In one embodiment, the conversion unit 315 includes a register and a digital-to-analog converter. The register stores the first addition signal, the second addition signal, the first subtraction signal and the second subtraction signal in the form of digital signals. The digital-to-analog converter generates a first adjustment current I ADJF1 according to the first addition signal or the first subtraction signal in the form of a digital signal. The digital-to-analog converter also generates a second adjustment current I ADJF2 according to the second addition signal or the second subtraction signal in the form of the digital signal.

下面將詳細介紹本發明如何根據第一監測電壓V1與低電壓臨限值VSL的關係及第二監測電壓V2與高電壓臨限值VSH的關係確定第二輸出電壓VS是否處於預設電壓範圍內。具體如下: The following will describe in detail how the present invention determines whether the second output voltage V S is in the within the preset voltage range. details as follows:

第一種情況:當比較器EA1判斷出第一監測電壓V1不低於低電壓臨限值VSL(如,比較器EA1輸出低電位)且比較器EA2判斷出第二監測電壓V2不高於高電壓臨限值VSH(如,比較器EA2輸出低電位)時,第一邏輯電路313不輸出第一加法信號且第二邏輯電路314不輸出第一減法信號。此時,轉換單元315不產生第一調節電流IADJF1,即IADJF1=0。在一實施例中,V1=VS.(R6+R7)/(R5+R6+R7) (3) The first case: when the comparator EA1 determines that the first monitoring voltage V 1 is not lower than the low voltage threshold V SL (eg, the comparator EA1 outputs a low level) and the comparator EA2 determines that the second monitoring voltage V 2 is not lower than the low voltage threshold V SL When higher than the high voltage threshold value V SH (eg, the comparator EA2 outputs a low level), the first logic circuit 313 does not output the first addition signal and the second logic circuit 314 does not output the first subtraction signal. At this time, the conversion unit 315 does not generate the first adjustment current I ADJF1 , that is, I ADJF1 =0. In one embodiment, V 1 =V S . (R 6 +R 7 )/(R 5 +R 6 +R 7 ) (3)

VSL=VTH1.(R6+R7)/(R5+R6+R7) (4) V SL =V TH1 . (R 6 +R 7 )/(R 5 +R 6 +R 7 ) (4)

V2=VS.R7/(R5+R6+R7) (5) V 2 =V S . R 7 /(R 5 +R 6 +R 7 ) (5)

VSH=VTH2.R7/(R5+R6+R7) (6) V SH =V TH2 . R 7 /(R 5 +R 6 +R 7 ) (6)

其中,VTH1為第二輸出電壓VS的預設電壓範圍中的最小電壓值,VTH2為第二輸出電壓VS的預設電壓範圍中的最大電壓值。當V1

Figure 110112457-A0305-02-0020-11
VSL,V2
Figure 110112457-A0305-02-0020-12
VSH時,利用(3)、(4)、(5)、(6)式可得到VS
Figure 110112457-A0305-02-0020-13
VTH1,VS
Figure 110112457-A0305-02-0020-14
VTH2。由於VTH1
Figure 110112457-A0305-02-0020-15
VTH2時,必然有VTH1
Figure 110112457-A0305-02-0020-16
VS
Figure 110112457-A0305-02-0020-17
VTH2。可見,當V1
Figure 110112457-A0305-02-0020-18
VSL,V2
Figure 110112457-A0305-02-0020-19
VSH時,必然有VTH1
Figure 110112457-A0305-02-0020-21
VS
Figure 110112457-A0305-02-0020-22
VTH2。 Wherein, V TH1 is the minimum voltage value in the preset voltage range of the second output voltage V S , and V TH2 is the maximum voltage value in the preset voltage range of the second output voltage V S. When V1
Figure 110112457-A0305-02-0020-11
VSL , V2
Figure 110112457-A0305-02-0020-12
When V SH , V S can be obtained by using equations (3), (4), (5) and (6)
Figure 110112457-A0305-02-0020-13
V TH1 , V S
Figure 110112457-A0305-02-0020-14
V TH2 . Since V TH1
Figure 110112457-A0305-02-0020-15
V TH2 , there must be V TH1
Figure 110112457-A0305-02-0020-16
V S
Figure 110112457-A0305-02-0020-17
V TH2 . Visible when V 1
Figure 110112457-A0305-02-0020-18
VSL , V2
Figure 110112457-A0305-02-0020-19
V SH , there must be V TH1
Figure 110112457-A0305-02-0020-21
V S
Figure 110112457-A0305-02-0020-22
V TH2 .

第二種情況:當比較器EA1判斷出第一監測電壓V1低於低電壓臨限值VSL(如,比較器EA1輸出高電位)且比較器EA2判斷出第二監測電壓V2不高於高電壓臨限值VSH(如,比較器EA2輸出低電位)時,第一邏輯電路313輸出第一加法信號且第二邏輯電路314不輸出第一減法信號。此時,轉換單元315產生的第一調節電流IADJF1(IADJF1<0)從電壓感應電路230流入轉換單元315,以增加第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內。在一實施例中,V1=VS.(R6+R7)/(R5+R6+R7) (7) The second case: when the comparator EA1 determines that the first monitoring voltage V 1 is lower than the low voltage threshold V SL (eg, the comparator EA1 outputs a high level) and the comparator EA2 determines that the second monitoring voltage V 2 is not high When the high voltage threshold value V SH (eg, the comparator EA2 outputs a low level), the first logic circuit 313 outputs the first addition signal and the second logic circuit 314 does not output the first subtraction signal. At this time, the first adjustment current I ADJF1 (I ADJF1 <0) generated by the converting unit 315 flows into the converting unit 315 from the voltage sensing circuit 230 to increase the second output voltage V S , so that the second output voltage V S is at a preset value within the voltage range. In one embodiment, V 1 =V S . (R 6 +R 7 )/(R 5 +R 6 +R 7 ) (7)

VSL=VTH1.(R6+R7)/(R5+R6+R7) (8) V SL =V TH1 . (R 6 +R 7 )/(R 5 +R 6 +R 7 ) (8)

V2=VS.R7/(R5+R6+R7) (9) V 2 =V S . R 7 /(R 5 +R 6 +R 7 ) (9)

VSH=VTH2.R7/(R5+R6+R7) (10)其中,VTH1為第二輸出電壓VS的預設電壓範圍中的最小電壓值,VTH2為第二輸出電壓VS的預設電壓範圍中的最大電壓值。當V1<VSL,V2

Figure 110112457-A0305-02-0020-23
VSH時,利用(7)(8)(9)(10)可得到VS<VTH1,VS
Figure 110112457-A0305-02-0020-24
VTH2。由於VTH1
Figure 110112457-A0305-02-0020-25
VTH2時,必然有VS<VTH1。可見,當V1<VSL,V2
Figure 110112457-A0305-02-0020-26
VSH時,必然有VS<VTH1。由於第一調節電流IADJF1從電壓感應電路230流入轉換單元315中,第二輸出電壓VS增加,直至增加後的第二輸出電壓VS處於預設電壓範圍內。 V SH =V TH2 . R 7 /(R 5 +R 6 +R 7 ) (10) Wherein, V TH1 is the minimum voltage value in the preset voltage range of the second output voltage V S , and V TH2 is the preset voltage value of the second output voltage V S The maximum voltage value in the voltage range. When V 1 < V SL , V 2
Figure 110112457-A0305-02-0020-23
When V SH , use (7)(8)(9)(10) to get V S <V TH1 , V S
Figure 110112457-A0305-02-0020-24
V TH2 . Since V TH1
Figure 110112457-A0305-02-0020-25
When V TH2 , there must be V S < V TH1 . It can be seen that when V 1 <V SL , V 2
Figure 110112457-A0305-02-0020-26
When V SH , there must be V S < V TH1 . Since the first adjustment current I ADJF1 flows from the voltage sensing circuit 230 into the conversion unit 315 , the second output voltage V S increases until the increased second output voltage V S is within the preset voltage range.

第三種情況:當比較器EA1判斷出第一監測電壓V1不低於低電壓臨限值VSL(如,比較器EA1輸出低電位)且比較器EA2判斷出第二監測電壓V2高於高電壓臨限值VSH(如,比較器EA2輸出高電位)時,第一邏輯電路313不輸出第一加法信號且第二邏輯電路314輸出第一減法信號。此時,轉換單元315產生的 第一調節電流IADJF1(IADJF1>0)從轉換單元315流入電壓感應電路230,以減小第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內。在一實施例中,V1=VS.(R6+R7)/(R5+R6+R7) (11) The third case: when the comparator EA1 determines that the first monitoring voltage V 1 is not lower than the low voltage threshold V SL (eg, the comparator EA1 outputs a low level) and the comparator EA2 determines that the second monitoring voltage V 2 is high When the high voltage threshold value V SH (eg, the comparator EA2 outputs a high level), the first logic circuit 313 does not output the first addition signal and the second logic circuit 314 outputs the first subtraction signal. At this time, the first adjustment current I ADJF1 (I ADJF1 >0) generated by the converting unit 315 flows into the voltage sensing circuit 230 from the converting unit 315 to reduce the second output voltage V S , so that the second output voltage V S is in the pre-condition within the voltage range. In one embodiment, V 1 =V S . (R 6 +R 7 )/(R 5 +R 6 +R 7 ) (11)

VSL=VTH1.(R6+R7)/(R5+R6+R7) (12) V SL =V TH1 . (R 6 +R 7 )/(R 5 +R 6 +R 7 ) (12)

V2=VS.R7/(R5+R6+R7) (13) V 2 =V S . R 7 /(R 5 +R 6 +R 7 ) (13)

VSH=VTH2.R7/(R5+R6+R7) (14)其中VTH1,為第二輸出電壓VS的預設電壓範圍中的最小電壓值,VTH2為第二輸出電壓VS的預設電壓範圍中的最大電壓值。當V1

Figure 110112457-A0305-02-0021-27
VSL,V2>VSH時,利用(11)、(12)、(13)、(14)可得到VS
Figure 110112457-A0305-02-0021-28
VTH1,VS>VTH2。由於VTH1
Figure 110112457-A0305-02-0021-29
VTH2時,必然有VS>VTH2。可見,當V1
Figure 110112457-A0305-02-0021-30
VSL,V2>VSH時,必然有VS>VTH2。由於第一調節電流IADJF1從轉換單元315流入電壓感應電路230中,則第二輸出電壓VS減小直至減小後的第二輸出電壓VS處於預設電壓範圍內。 V SH =V TH2 . R 7 /(R 5 +R 6 +R 7 ) (14) where V TH1 is the minimum voltage value in the preset voltage range of the second output voltage V S , and V TH2 is the preset value of the second output voltage V S The maximum voltage value in the voltage range. When V1
Figure 110112457-A0305-02-0021-27
When V SL , V 2 >V SH , V S can be obtained by using (11), (12), (13), (14)
Figure 110112457-A0305-02-0021-28
V TH1 , V S >V TH2 . Since V TH1
Figure 110112457-A0305-02-0021-29
When V TH2 , there must be V S > V TH2 . Visible when V 1
Figure 110112457-A0305-02-0021-30
When V SL and V 2 >V SH , there must be V S >V TH2 . Since the first adjustment current IADJF1 flows into the voltage sensing circuit 230 from the conversion unit 315 , the second output voltage V S decreases until the reduced second output voltage V S is within the preset voltage range.

當第二輸出電壓VS處於預設電壓範圍內時,再根據指示光源電流I1、I2、......、IN的電流回饋信號SISEN與指示目標電流值的電流基準信號SADJ的關係確定光源電流I1、I2、......、IN是否為目標電流值。具體情況如下: When the second output voltage V S is within the preset voltage range, the current feedback signal S ISEN indicating the light source currents I 1 , I 2 , . . . , IN and the current reference signal indicating the target current value are further feedback The relationship of SADJ determines whether the light source currents I 1 , I 2 , . . . , IN are the target current values. Details are as follows:

如果電流回饋信號SISEN大於電流基準信號SADJ,比較器EA3輸出低電位且比較器EA4輸出高電位。此時,第一邏輯電路313不輸出第二加法信號且第二邏輯電路314輸出第二減法信號。轉換單元315根據第二減法信號產生第二調節電流IADJF2。其中第二調節電流IADJF2(IADJF2>0)從轉換單元315流入電壓感應電路230,以減小第一輸出電壓VOUT,進而減小光源電流I1、I2、......、IN,最終使光源電流I1、I2、......、IN減小為目標電流值。 If the current feedback signal S ISEN is greater than the current reference signal S ADJ , the comparator EA3 outputs a low level and the comparator EA4 outputs a high level. At this time, the first logic circuit 313 does not output the second addition signal and the second logic circuit 314 outputs the second subtraction signal. The conversion unit 315 generates the second adjustment current I ADJF2 according to the second subtraction signal. The second adjustment current I ADJF2 (I ADJF2 >0) flows from the conversion unit 315 into the voltage sensing circuit 230 to reduce the first output voltage V OUT , thereby reducing the light source currents I 1 , I 2 ,  … , I N , and finally reduce the light source currents I 1 , I 2 , . . . , I N to the target current value.

如果電流回饋信號SISEN小於電流基準信號SADJ,比較器EA3輸出高電位且比較器EA4輸出低電位。此時,第一邏輯電路313輸出第二加法信號且第二邏輯電路314不輸出第二減法信號。轉換單元315根據第二加法信號產生第二調 節電流IADJF2。其中第二調節電流IADJF2(IADJF2<0)從電壓感應電路230流入轉換單元315,以增加第一輸出電壓VOUT,進而增加光源電流I1、I2、......、IN,最終使光源電流I1、I2、......、IN增加為目標電流值。 If the current feedback signal S ISEN is smaller than the current reference signal S ADJ , the comparator EA3 outputs a high level and the comparator EA4 outputs a low level. At this time, the first logic circuit 313 outputs the second addition signal and the second logic circuit 314 does not output the second subtraction signal. The conversion unit 315 generates the second adjustment current I ADJF2 according to the second addition signal. The second adjustment current I ADJF2 (I ADJF2 <0) flows from the voltage sensing circuit 230 into the conversion unit 315 to increase the first output voltage V OUT , thereby increasing the light source currents I 1 , I 2 , . . . , I N , and finally the light source currents I 1 , I 2 , . . . , IN are increased to the target current value.

如果電流回饋信號SISEN等於電流基準信號SADJ,比較器EA3輸出低電位且比較器EA4輸出低電位。此時,第一邏輯電路313不輸出第二加法信號且第二邏輯電路314不輸出第二減法信號。轉換單元315不產生第二調節電流IADJF2(IADJF2=0)。這說明光源電流I1、I2、......、IN已經為目標電流值。 If the current feedback signal S ISEN is equal to the current reference signal S ADJ , the comparator EA3 outputs a low level and the comparator EA4 outputs a low level. At this time, the first logic circuit 313 does not output the second addition signal and the second logic circuit 314 does not output the second subtraction signal. The conversion unit 315 does not generate the second adjustment current I ADJF2 (I ADJF2 =0). This indicates that the light source currents I 1 , I 2 , . . . , IN have reached the target current value.

該調節端ADJF耦接於電壓感應電路230,傳輸第一調節電流IADJF1和第二調節電流IADJF2。該調節端ADJF為輸入/輸出端(如,雙向端),既可以將第一調節電流IADJF1和第二調節電流IADJF2從控制器220輸出至電壓感應電路230,又可以將第一調節電流IADJF1和第二調節電流IADJF2從電壓感應電路230輸出至控制器220中。 The adjustment terminal ADJF is coupled to the voltage sensing circuit 230 and transmits the first adjustment current I ADJF1 and the second adjustment current I ADJF2 . The adjustment terminal ADJF is an input/output terminal (eg, a bidirectional terminal), which can not only output the first adjustment current I ADJF1 and the second adjustment current I ADJF2 from the controller 220 to the voltage sensing circuit 230 , but also output the first adjustment current I ADJF2 to the voltage sensing circuit 230 . I ADJF1 and the second adjustment current I ADJF2 are output from the voltage sensing circuit 230 to the controller 220 .

並聯調節器330透過電壓感應端VSEN連接電壓感應電路230,以接收電壓感應信號VSEN(可能是未經調節的電壓感應信號VSEN、調節後的電壓感應信號VSEN或二次調節後的電壓感應信號VSEN,本段下同),透過控制端CMPO連接光耦合器240,以輸出控制電流ICMPO(可能是第一控制電流ICMPO1、第二控制電流ICMPO2或第三控制電流ICMPO3,本段下同)。該並聯調節器330根據電壓感應信號VSEN與電壓基準信號VREF之間的差值產生控制電流ICMPO。具體地,該並聯調節器330根據調節後的電壓感應信號VSEN與電壓基準信號VREF之間的差值產生第一控制電流ICMPO1。該並聯調節器330根據二次調節後的電壓感應信號VSEN與電壓基準信號VREF之間的差值產生第二控制電流ICMPO2。該並聯調節器330根據未經調節的電壓感應信號VSEN與電壓基準信號VREF之間的差值產生第三控制電流ICMPO3The shunt regulator 330 is connected to the voltage sensing circuit 230 through the voltage sensing terminal VSEN to receive the voltage sensing signal VSEN (which may be the unregulated voltage sensing signal VSEN , the regulated voltage sensing signal VSEN or the secondary regulated voltage The sensing signal V SEN , the same below in this paragraph) is connected to the optocoupler 240 through the control terminal CMPO to output the control current I CMPO ( which may be the first control current I CMPO1 , the second control current I CMPO2 or the third control current I CMPO3 ) , the same below in this paragraph). The shunt regulator 330 generates the control current I CMPO according to the difference between the voltage sense signal V SEN and the voltage reference signal V REF . Specifically, the parallel regulator 330 generates the first control current I CMPO1 according to the difference between the adjusted voltage sensing signal V SEN and the voltage reference signal V REF . The parallel regulator 330 generates the second control current I CMPO2 according to the difference between the voltage sensing signal V SEN and the voltage reference signal V REF after the secondary adjustment. The parallel regulator 330 generates the third control current I CMPO3 according to the difference between the unregulated voltage sense signal V SEN and the voltage reference signal V REF .

在一實施例中,並聯調節器330包括誤差放大器EA5和MOS晶體M2。誤差放大器EA5的非反相輸入端耦接於電壓感應端VSEN,以接收電壓感應信號 VSEN(可能是未經調節的電壓感應信號VSEN、調節後的電壓感應信號VSEN或二次調節後的電壓感應信號VSEN,本段下同),反相輸入端接收基準信號產生器(第3圖未標出)產生的電壓基準信號VREF,輸出端輸出該誤差放大器EA5根據電壓感應信號VSEN和電壓基準信號VREF產生的誤差信號。MOS晶體M2的閘極耦接於誤差放大器EA5的輸出端,以接收該誤差信號,源極接地,汲極連接控制器220中的控制端CMPO,以產生控制電流ICMPO(可能是第一控制電流ICMPO1、第二控制電流ICMPO2或第三控制電流ICMPO3,本段下同)。由於MOS晶體M2工作在可變電阻區,則施加在MOS晶體M2閘極上的電壓越大,MOS晶體M2的阻抗越小。在本實施例中,當電壓感應信號VSEN小於電壓基準信號VREF時,誤差信號的電壓值增加,MOS晶體M2的阻抗減小,因此流過MOS晶體M2的控制電流ICMPO增加。當電壓感應信號VSEN大於電壓基準信號VREF時,誤差信號的電壓值減小,MOS晶體M2的阻抗增加。因此,流過MOS晶體M2的控制電流ICMPO減小。其中,該控制電流ICMPO從光耦合器240流經MOS晶體M2至地。在本實施例中,該誤差放大器EA5為運算放大器。 In one embodiment, the shunt regulator 330 includes an error amplifier EA5 and a MOS crystal M2. The non-inverting input terminal of the error amplifier EA5 is coupled to the voltage sensing terminal VSEN to receive the voltage sensing signal VSEN (which may be the unregulated voltage sensing signal VSEN , the regulated voltage sensing signal VSEN or the secondary regulated voltage sensing signal VSEN ) The voltage sensing signal V SEN , the same below in this paragraph), the inverting input terminal receives the voltage reference signal V REF generated by the reference signal generator (not shown in Figure 3), and the output terminal outputs the error amplifier EA5 according to the voltage sensing signal V REF Error signal generated by SEN and the voltage reference signal V REF . The gate of the MOS crystal M2 is coupled to the output terminal of the error amplifier EA5 to receive the error signal, the source is grounded, and the drain is connected to the control terminal CMPO in the controller 220 to generate the control current I CMPO (which may be the first control The current I CMPO1 , the second control current I CMPO2 or the third control current I CMPO3 , the same below in this paragraph). Since the MOS crystal M2 works in the variable resistance region, the greater the voltage applied to the gate of the MOS crystal M2, the smaller the impedance of the MOS crystal M2. In this embodiment, when the voltage sensing signal V SEN is less than the voltage reference signal V REF , the voltage value of the error signal increases, the impedance of the MOS crystal M2 decreases, and thus the control current I CMPO flowing through the MOS crystal M2 increases. When the voltage sensing signal V SEN is greater than the voltage reference signal V REF , the voltage value of the error signal decreases, and the impedance of the MOS crystal M2 increases. Therefore, the control current I CMPO flowing through the MOS crystal M2 decreases. Wherein, the control current I CMPO flows from the optical coupler 240 to the ground through the MOS crystal M2. In this embodiment, the error amplifier EA5 is an operational amplifier.

具體地,在第一調節電流IADJF1和第二調節電流IADJF2均未調節電壓感應信號VSEN(未經調節的電壓感應信號VSEN)之前,該未經調節的電壓感應信號VSEN與第一輸出電壓VOUT成正比。例如,VSEN=VOUT.R2/(R2+R8),其中R2表示電阻R2的電阻值,R8表示電阻R8的電阻值。並聯調節器330根據該未經調節的電壓感應信號VSEN與電壓基準信號VREF之間的差值產生第三控制電流ICMPO3。光耦合器240根據該第三控制電流ICMPO3產生第三控制信號S3,以使電能轉換器103透過增加或減小第一輸出電壓VOUT的方式來減小該未經調節的電壓感應信號VSEN與電壓基準信號VREF之間的差值。因此,在第一調節電流IADJF1和第二調節電流IADJF2均未調節電壓感應信號VSEN(未經調節的電壓感應信號VSEN)之前,未經調節的電壓感應信號VSEN可被調節至電壓基準信號VREF,如VSEN=VREF,第一輸 出電壓VOUT可被調節為電壓基準信號VREF所確定的目標電壓值VTARGET,如VOUT=VTARGET=VREF.(R2+R8)/R2。如果第一監測電壓V1不低於低電壓臨限值VSL且第二監測電壓V2高於高電壓臨限值VSH,第一調節電流IADJF1(IADJF1>0)被輸出至電壓感應電路230,以增加電壓感應信號VSEN(未經調節的電壓感應信號VSEN)。根據增加後的電壓感應信號VSEN(調節後的電壓感應信號VSEN),並聯調節器330產生的第一控制電流ICMPO1減小。光耦合器240根據該減小後的第一控制電流ICMPO1產生處於第一狀態(如,低電位)的第一控制信號S1。電能轉換器103根據該第一狀態(如,低電位)的第一控制信號S1減小第二輸出電壓VS繼而使第二輸出電壓VS處於預設電壓範圍內。如果第一監測電壓V1低於低電壓臨限值VSL且第二監測電壓V2不高於高電壓臨限值VSH,第一調節電流IADJF1(IADJF1<0)流入控制器220中,以減小電壓感應信號VSEN(未經調節的電壓感應信號VSEN)。根據減小後的電壓感應信號VSEN(調節後的電壓感應信號VSEN),並聯調節器330產生的第一控制電流ICMPO1增加。光耦合器240根據該增加後的第一控制電流ICMPO1產生處於第二狀態(如,高電位)的第一控制信號S1。電能轉換器103根據該第二狀態(如,高電位)的第一控制信號S1增加第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內。如果第一監測電壓V1不低於低電壓臨限值VSL且第二監測電壓V2不高於高電壓臨限值VSH時,第一調節電流IADJF1不產生(即IADJF1=0)。此時,第二輸出電壓VS已處於預設電壓範圍內,無需任何改變。可見,處於預設電壓範圍內的第二輸出電壓VS可相容多種顯示器,無需再根據顯示器的型號而設計匹配電路,實現通用化,設計更簡易。 Specifically, before the first adjustment current I ADJF1 and the second adjustment current I ADJF2 do not adjust the voltage sensing signal V SEN (the unadjusted voltage sensing signal V SEN ), the unadjusted voltage sensing signal V SEN and the An output voltage V OUT is proportional to. For example, V SEN =V OUT . R 2 /(R 2 +R 8 ), wherein R 2 represents the resistance value of the resistor R2, and R 8 represents the resistance value of the resistor R8. The shunt regulator 330 generates a third control current I CMPO3 according to the difference between the unregulated voltage sensing signal V SEN and the voltage reference signal V REF . The optocoupler 240 generates a third control signal S3 according to the third control current I CMPO3 , so that the power converter 103 reduces the unregulated voltage sensing signal V by increasing or decreasing the first output voltage V OUT The difference between SEN and the voltage reference signal V REF . Therefore, before neither the first adjustment current I ADJF1 nor the second adjustment current I ADJF2 adjusts the voltage sensing signal V SEN (the unadjusted voltage sensing signal V SEN ), the unadjusted voltage sensing signal V SEN may be adjusted to For the voltage reference signal V REF , for example, V SEN =V REF , the first output voltage V OUT can be adjusted to a target voltage value V TARGET determined by the voltage reference signal V REF , for example, V OUT =V TARGET =V REF . (R 2 +R 8 )/R 2 . If the first monitoring voltage V 1 is not lower than the low voltage threshold value V SL and the second monitoring voltage V 2 is higher than the high voltage threshold value V SH , the first regulation current I ADJF1 (I ADJF1 >0) is output to the voltage The sensing circuit 230 is used to increase the voltage sensing signal VSEN (the unregulated voltage sensing signal VSEN ). According to the increased voltage sensing signal VSEN (adjusted voltage sensing signal VSEN ), the first control current I CMPO1 generated by the parallel regulator 330 decreases. The optical coupler 240 generates a first control signal S1 in a first state (eg, a low level) according to the reduced first control current I CMPO1 . The power converter 103 reduces the second output voltage V S according to the first control signal S1 in the first state (eg, low level) so as to keep the second output voltage V S within a predetermined voltage range. If the first monitoring voltage V 1 is lower than the low voltage threshold value V SL and the second monitoring voltage V 2 is not higher than the high voltage threshold value V SH , the first regulation current I ADJF1 (I ADJF1 <0) flows into the controller 220 , to reduce the voltage sense signal V SEN (the unregulated voltage sense signal V SEN ). According to the reduced voltage sensing signal VSEN (adjusted voltage sensing signal VSEN ), the first control current I CMPO1 generated by the parallel regulator 330 increases. The optical coupler 240 generates the first control signal S1 in the second state (eg, high level) according to the increased first control current I CMPO1 . The power converter 103 increases the second output voltage V S according to the first control signal S1 in the second state (eg, high level), so that the second output voltage V S is within a predetermined voltage range. If the first monitoring voltage V 1 is not lower than the low voltage threshold value V SL and the second monitoring voltage V 2 is not higher than the high voltage threshold value V SH , the first regulating current I ADJF1 is not generated (ie, I ADJF1 =0 ). At this time, the second output voltage V S is already within the preset voltage range and does not need any change. It can be seen that the second output voltage V S within the preset voltage range is compatible with a variety of displays, and there is no need to design a matching circuit according to the model of the display, thereby achieving generalization and simpler design.

當第二輸出電壓VS處於預設電壓範圍時,如果電流回饋信號SISEN大於電流基準信號SADJ,第二調節電流IADJF2(IADJF2>0)被輸出至電壓感應電路230,以增加調節後的電壓感應信號VSEN。在調節後的電壓感應信號VSEN增加後(二次調節後的電壓感應信號VSFN),並聯調節器330產生的第二控制電流ICMPO2減小。光 耦合器240根據該減小後的第二控制電流ICMPO2產生處於第一狀態(如,低電位)的第二控制信號S2。電能轉換器103根據該第一狀態(如,低電位)的第二控制信號S2減小第一輸出電壓VOUT(如,使第一輸出電壓VOUT低於上述目標電壓值),繼而減小光源電流I1、I2、......、IN以使光源電流I1、I2、......、IN減小為目標電流值。如果電流回饋信號SISEN小於電流基準信號SADJ,第二調節電流IADJF2(IADJF2<0)流入控制器220中,以減小調節後的電壓感應信號VSEN。在調節後的電壓感應信號VSEN減小後(二次調節後的電壓感應信號VSEN),並聯調節器330產生的第二控制電流ICMPO2增加。光耦合器240根據該增加後的第二控制電流ICMPO2產生處於第二狀態(如,高電位)的第二控制信號S2。電能轉換器103根據該第二狀態(如,高電位)的第二控制信號S2增加第一輸出電壓VOUT(如,使第一輸出電壓VOUT高於上述目標電壓值),繼而增加光源電流I1、I2、......、IN,以使光源電流I1、I2、......、IN增加為目標電流值。如果電流回饋信號SISEN等於電流基準信號SADJ,控制器220產生的第二調節電流IADJF2為零(IADJF2=0)。這說明該光源電流I1、I2、......、IN已均為目標電流值,無需任何調節。以上情況均可最大程度的減少光源104的功耗,提高功率效率。 When the second output voltage V S is within the preset voltage range, if the current feedback signal S ISEN is greater than the current reference signal S ADJ , the second adjustment current I ADJF2 (I ADJF2 >0) is output to the voltage sensing circuit 230 to increase the adjustment After the voltage sense signal V SEN . After the adjusted voltage sense signal V SEN increases (the second adjusted voltage sense signal V SFN ), the second control current I CMPO2 generated by the parallel regulator 330 decreases. The optical coupler 240 generates the second control signal S2 in the first state (eg, low level) according to the reduced second control current I CMPO2 . The power converter 103 reduces the first output voltage V OUT (eg, makes the first output voltage V OUT lower than the target voltage value) according to the second control signal S2 in the first state (eg, low level), and then decreases The light source currents I 1 , I 2 , . . . , IN are reduced to target current values. If the current feedback signal S ISEN is less than the current reference signal S ADJ , the second adjustment current I ADJF2 (I ADJF2 <0) flows into the controller 220 to reduce the adjusted voltage sensing signal V SEN . After the regulated voltage sensing signal VSEN decreases (the secondary regulated voltage sensing signal VSEN), the second control current I CMPO2 generated by the parallel regulator 330 increases. The optical coupler 240 generates a second control signal S2 in a second state (eg, a high level) according to the increased second control current I CMPO2 . The power converter 103 increases the first output voltage V OUT (eg, makes the first output voltage V OUT higher than the target voltage value) according to the second control signal S2 in the second state (eg, high level), and then increases the light source current I 1 , I 2 , ..., I N , so that the light source currents I 1 , I 2 , ..., I N are increased to target current values. If the current feedback signal S ISEN is equal to the current reference signal S ADJ , the second adjustment current I ADJF2 generated by the controller 220 is zero (I ADJF2 =0). This shows that the light source currents I 1 , I 2 , . . . , IN are all target current values, and no adjustment is required. In the above cases, the power consumption of the light source 104 can be reduced to the greatest extent, and the power efficiency can be improved.

該驅動器340耦接於控制器220中的致能端ENA,根據電壓信號產生驅動信號。其中,致能端ENA在光源104被點亮時產生電壓信號。負載單元250根據該驅動信號導通預設時間段,以減小第一輸出電壓VOUT。在一實施例中,當光源104被點亮時,致能端ENA產生電壓信號(如,高電位)。驅動器340根據該電壓信號產生處於第一狀態的驅動信號(如,高電位)。MOS晶體M1接收到該處於第一狀態的驅動信號並導通預設時間段。在該預設時間段內,第一輸出電壓VOUT經電阻R1分壓後減小。此時減小後的第一輸出電壓VOUT不會導致光源104閃爍甚至燒壞。當MOS晶體M1持續導通預設時間段後,驅動器340產生處於第二狀態的驅動信號(如,低電位),MOS晶體M1斷開。由於光源104點亮後,控 制器220可調節第一輸出電壓VOUT,不會再發生第一輸出電壓VOUT過高的情況。因此,該系統200在光源104點亮後的預設時間段內斷開MOS晶體M1的做法可保護光源104,還可減少額外電能的消耗,提高功率效率。 The driver 340 is coupled to the enable terminal ENA of the controller 220, and generates a driving signal according to the voltage signal. The enable terminal ENA generates a voltage signal when the light source 104 is turned on. The load unit 250 is turned on for a predetermined period of time according to the driving signal to reduce the first output voltage V OUT . In one embodiment, when the light source 104 is turned on, the enable terminal ENA generates a voltage signal (eg, a high voltage). The driver 340 generates a driving signal in a first state (eg, a high level) according to the voltage signal. The MOS crystal M1 receives the driving signal in the first state and is turned on for a predetermined period of time. During the preset time period, the first output voltage V OUT is reduced after being divided by the resistor R1 . At this time, the reduced first output voltage V OUT will not cause the light source 104 to flicker or even burn out. After the MOS crystal M1 is continuously turned on for a predetermined period of time, the driver 340 generates a driving signal (eg, a low potential) in the second state, and the MOS crystal M1 is turned off. Since the controller 220 can adjust the first output voltage V OUT after the light source 104 is turned on, the situation that the first output voltage V OUT is too high will no longer occur. Therefore, the system 200 disconnects the MOS crystal M1 within a preset time period after the light source 104 is turned on, which can protect the light source 104, reduce the consumption of extra power, and improve the power efficiency.

該電壓保護端OVP耦接於過壓保護單元260,以接收第三監測電壓V3。驅動器340根據該第三監測電壓V3執行保護操作。其中驅動器340還連接選擇器321(第3圖未標出該連接關係)。具體地,如果LED串S1、S2、......、SN中某些LED串處於開路狀態,則處於開路狀態的LED串Sj(j=1,2,......,N)的光源電流Ij最小(例如,為零),那麼指示該光源電流Ij的指示電壓VINj或感應電壓VSj也最小。選擇器321選擇該指示電壓VINj或感應電壓VSj作為電流回饋信號SISEN,從而導致第一輸出電壓VOUT持續增加。當第三監測電壓V3不小於第一預設電壓VSET1而小於第二預設電壓VSET2(VSET1

Figure 110112457-A0305-02-0026-31
V3<VSET2)時,在驅動器340的控制下,選擇器321不選擇該指示電壓VINj或感應電壓VSj作為電流回饋信號SISEN,從而阻止第一輸出電壓VOUT持續增加。如果LED串S1、S2、......、SN均處於開路狀態,則選擇器321只能選擇該指示電壓VINj或感應電壓VSj作為電流回饋信號SISEN,從而導致第一輸出電壓VOUT持續增加。當第三監測電壓V3不小於第二預設電壓VSET2而小於第三預設電壓VSET3(VSET2
Figure 110112457-A0305-02-0026-32
V3<VSET3)時,驅動器340控制MOS晶體M1導通,以減小第一輸出電壓VOUT。當第三監測電壓V3不小於第三預設電壓VSET3(V3
Figure 110112457-A0305-02-0026-33
VSET3)時,驅動器340控制所有埠(電壓檢測端311、電流檢測端312、調節端ADJE、控制端CMPO、脈波寬度調變端PWM、過壓保護端OVP、致能端ENA及負載端LOAD)均斷開,以防止燒壞控制器220。其中第一預設電壓VSET1小於第二預設電壓VSET2,第二預設電壓VSET2小於第三預設電壓VSET3。在本實施例中,第一預設電壓VSET1为2.5V,第二預設電壓VSET2为2.8V,第三預設電壓VSET3為3.5V。 The voltage protection terminal OVP is coupled to the overvoltage protection unit 260 to receive the third monitoring voltage V 3 . The driver 340 performs a protection operation according to the third monitoring voltage V3 . The driver 340 is also connected to the selector 321 (the connection relationship is not shown in FIG. 3). Specifically, if some LED strings in the LED strings S1, S2, ..., SN are in an open-circuit state, then the LED strings in the open-circuit state Sj (j=1, 2, ..., N ) of the light source current I j is the smallest (eg, zero), then the indicated voltage V INj or the induced voltage V Sj indicating the light source current I j is also the smallest. The selector 321 selects the indication voltage V INj or the induced voltage V Sj as the current feedback signal S ISEN , thereby causing the first output voltage V OUT to continuously increase. When the third monitoring voltage V 3 is not less than the first preset voltage V SET1 but less than the second preset voltage V SET2 (V SET1
Figure 110112457-A0305-02-0026-31
When V 3 <V SET2 ), under the control of the driver 340 , the selector 321 does not select the indication voltage V INj or the induced voltage V Sj as the current feedback signal S ISEN , thereby preventing the first output voltage V OUT from increasing continuously. If the LED strings S1 , S2 , . V OUT continues to increase. When the third monitoring voltage V 3 is not less than the second preset voltage V SET2 but less than the third preset voltage V SET3 (V SET2
Figure 110112457-A0305-02-0026-32
When V 3 <V SET3 ), the driver 340 controls the MOS transistor M1 to be turned on to reduce the first output voltage V OUT . When the third monitoring voltage V 3 is not less than the third preset voltage V SET3 (V 3
Figure 110112457-A0305-02-0026-33
V SET3 ), the driver 340 controls all ports (the voltage detection terminal 311, the current detection terminal 312, the adjustment terminal ADJE, the control terminal CMPO, the pulse width modulation terminal PWM, the overvoltage protection terminal OVP, the enable terminal ENA and the load terminal LOAD) are all disconnected to prevent the controller 220 from being burned out. The first preset voltage V SET1 is less than the second preset voltage V SET2 , and the second preset voltage V SET2 is less than the third preset voltage V SET3 . In this embodiment, the first preset voltage V SET1 is 2.5V, the second preset voltage V SET2 is 2.8V, and the third preset voltage V SET3 is 3.5V.

第4圖係根據本發明一個實施例的電能轉換器103的電路圖。電能轉換器103包括脈寬調變(Pulse-Width Modulation,PWM)信號產生器410和開關 式變壓器電路420。PWM信號產生器410根據控制信號S(可能是第一控制信號S1、第二控制信號S2或第三控制信號S3,本段下同)改變PWM信號的責任週期,從而控制變壓器電路420調節第一輸出電壓VOUT和第二輸出電壓VS。其中,PWM信號的責任週期是指在一個週期內,一種狀態(如,高電位)所持續的時間與該週期時間的比率。在一實施例中,根據處於第一狀態的控制信號S,PWM信號產生器410減小PWM信號的責任週期,以減小第一輸出電壓VOUT和第二輸出電壓VS。根據處於第二狀態的控制信號S,PWM信號產生器410增加PWM信號的責任週期,以增加第一輸出電壓VOUT和第二輸出電壓VSFIG. 4 is a circuit diagram of a power converter 103 according to one embodiment of the present invention. The power converter 103 includes a Pulse-Width Modulation (PWM) signal generator 410 and a switching transformer circuit 420 . The PWM signal generator 410 changes the duty cycle of the PWM signal according to the control signal S (which may be the first control signal S1, the second control signal S2 or the third control signal S3, the same below in this paragraph), thereby controlling the transformer circuit 420 to adjust the first control signal. The output voltage V OUT and the second output voltage V S . The duty cycle of the PWM signal refers to the ratio of the duration of a state (eg, high potential) to the cycle time in one cycle. In one embodiment, according to the control signal S in the first state, the PWM signal generator 410 reduces the duty cycle of the PWM signal to reduce the first output voltage V OUT and the second output voltage V S . According to the control signal S in the second state, the PWM signal generator 410 increases the duty cycle of the PWM signal to increase the first output voltage V OUT and the second output voltage V S .

開關式變壓器電路420包括初級繞組電路421、次級繞組電路W1、次級繞組電路W2以及開關422。初級繞組電路421的一端連接整流器102,另一端連接開關422,以在開關422導通時,接收來自電源VAC的電能。開關422還連接PWM信號產生器410,以根據PWM信號導通或斷開。次級繞組電路W1的一端連接光源104,以輸出第一輸出電壓VOUT,另一端接地。次級繞組電路W2的一端連接電壓監測電路210,以輸出第二輸出電壓VS,另一端接地。 The switched transformer circuit 420 includes a primary winding circuit 421 , a secondary winding circuit W1 , a secondary winding circuit W2 and a switch 422 . One end of the primary winding circuit 421 is connected to the rectifier 102, and the other end is connected to the switch 422, so as to receive power from the power source V AC when the switch 422 is turned on. The switch 422 is also connected to the PWM signal generator 410 to be turned on or off according to the PWM signal. One end of the secondary winding circuit W1 is connected to the light source 104 to output the first output voltage V OUT , and the other end is grounded. One end of the secondary winding circuit W2 is connected to the voltage monitoring circuit 210 to output the second output voltage V S , and the other end is grounded.

在一實施例中,當PWM信號處於第一狀態(如,高電位)時,開關422導通,初級繞組電路421接收來自電源VAC的電能,變壓器電路420的磁芯存儲磁能,初級繞組電路421上產生初級電流IP。當PWM信號處於第二狀態(如,低電位)時,開關422斷開,初級繞組電路421不再接收來自電源VAC的電能,變壓器電路420中的磁芯向次級繞組電路W1、W2釋放磁能,次級繞組電路W1、W2上有次級電流IS1、IS2產生。該次級電流IS1流向第1圖及第2圖中的光源104,次級電流IS2流向電壓監測電路210。可見,PWM信號可控制開關422交替地致能和除能初級繞組電路421與電源VAC之間的電能傳輸。PWM信號產生器410可透過改變PWM信號中某種狀態(如,高電位)的責任週期來改變第一輸出電壓VOUT和第二輸出電壓VS。如,增加第一狀態(如,高電位)的責任週期,第一輸出電壓VOUT 和第二輸出電壓VS增加。在其他實施例中,變壓器電路420也可以包括中心抽頭轉換器拓撲結構、返磁式變壓器拓撲結構、順向轉換器拓撲結構等等。 In one embodiment, when the PWM signal is in the first state (eg, high potential), the switch 422 is turned on, the primary winding circuit 421 receives power from the power supply V AC , the magnetic core of the transformer circuit 420 stores magnetic energy, and the primary winding circuit 421 A primary current I P is generated on it. When the PWM signal is in the second state (eg, low potential), the switch 422 is turned off, the primary winding circuit 421 no longer receives power from the power supply V AC , and the magnetic core in the transformer circuit 420 is released to the secondary winding circuits W1 and W2 Magnetic energy, secondary currents I S1 and I S2 are generated on the secondary winding circuits W1 and W2. The secondary current I S1 flows to the light source 104 in FIGS. 1 and 2 , and the secondary current I S2 flows to the voltage monitoring circuit 210 . It can be seen that the PWM signal can control the switch 422 to alternately enable and disable the power transfer between the primary winding circuit 421 and the power supply V AC . The PWM signal generator 410 can change the first output voltage V OUT and the second output voltage V S by changing the duty cycle of a certain state (eg, high level) in the PWM signal. For example, by increasing the duty cycle of the first state (eg, high level), the first output voltage V OUT and the second output voltage V S are increased. In other embodiments, the transformer circuit 420 may also include a center-tapped converter topology, a flyback transformer topology, a forward converter topology, and the like.

第5圖係根據本發明一個實施例的驅動光源的方法流程圖500。第圖5將結合第1圖及第2圖進行描述。 FIG. 5 is a flowchart 500 of a method for driving a light source according to an embodiment of the present invention. FIG. 5 will be described in conjunction with FIG. 1 and FIG. 2 .

步驟501,電能轉換器103將輸入電能轉換成為光源104供電的第一輸出電壓VOUT和為系統100中除光源104以外的元件供電的第二輸出電壓VSStep 501 , the power converter 103 converts the input power into a first output voltage V OUT for powering the light source 104 and a second output voltage V S for powering the components in the system 100 other than the light source 104 .

步驟502,控制電路105感應第一輸出電壓VOUT、第二輸出電壓VS及流過光源104的光源電流I1、I2、......、IN。其中,第一輸出電壓VOUT及第二輸出電壓VS均先於光源電流I1、I2、......、IN被感應到。 Step 502 , the control circuit 105 senses the first output voltage V OUT , the second output voltage V S and the light source currents I 1 , I 2 , . . . , IN flowing through the light source 104 . The first output voltage V OUT and the second output voltage V S are both sensed before the light source currents I 1 , I 2 , . . . , IN .

步驟503,控制電路105根據第一輸出電壓VOUT產生指示第一輸出電壓VOUT的電壓感應信號VSEN(未經調節的電壓感應信號VSEN)。 Step 503, the control circuit 105 generates a voltage sensing signal VSEN (unregulated voltage sensing signal VSEN ) indicating the first output voltage V OUT according to the first output voltage V OUT .

步驟504,控制電路105根據第二輸出電壓VS調節電壓感應信號VSEN(未經調節的電壓感應信號VSEN)以產生調節後的電壓感應信號VSENStep 504 , the control circuit 105 adjusts the voltage sensing signal V SEN (unadjusted voltage sensing signal V SEN ) according to the second output voltage V S to generate the adjusted voltage sensing signal V SEN .

步驟505,控制電路105根據調節後的電壓感應信號VSEN產生第一控制信號S1。 Step 505, the control circuit 105 generates a first control signal S1 according to the adjusted voltage sensing signal V SEN .

步驟506,電能轉換器103根據該第一控制信號S1調節第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內。 Step 506 , the power converter 103 adjusts the second output voltage V S according to the first control signal S1 , so that the second output voltage V S is within a preset voltage range.

步驟507,當第二輸出電壓VS處於預設電壓範圍內時,控制電路105根據光源電流I1、I2、......、IN調節該調節後的電壓感應信號VSEN以產生二次調節後的電壓感應信號VSENStep 507, when the second output voltage V S is within the preset voltage range, the control circuit 105 adjusts the adjusted voltage sensing signal V SEN according to the light source currents I 1 , I 2 , . . . , IN to A secondary adjusted voltage sensing signal VSEN is generated.

步驟508,當第二輸出電壓VS處於預設電壓範圍內時,控制電路105根據二次調節後的電壓感應信號VSEN產生第二控制信號S2。 Step 508 , when the second output voltage V S is within the preset voltage range, the control circuit 105 generates a second control signal S2 according to the voltage sensing signal V SEN after the secondary adjustment.

步驟509,電能轉換器103根據該第二控制信號S2調節第一輸出電壓VOUT,以使光源電流I1、I2、......、IN保持為目標電流值。 Step 509 , the power converter 103 adjusts the first output voltage V OUT according to the second control signal S2 to keep the light source currents I 1 , I 2 , . . . , IN at the target current value.

第6圖係根據本發明另一個實施例的驅動光源的方法流程圖600。第6圖將結合第2圖及第3圖進行描述。 FIG. 6 is a flowchart 600 of a method for driving a light source according to another embodiment of the present invention. Figure 6 will be described in conjunction with Figures 2 and 3.

步驟601,該光源驅動系統200供電。 Step 601, the light source driving system 200 is powered.

步驟602,電能轉換器103產生第一輸出電壓VOUT和第二輸出電壓VSStep 602, the power converter 103 generates a first output voltage V OUT and a second output voltage V S .

步驟603,電壓監測電路210產生指示第二輸出電壓VS的第一監測電壓V1和第二監測電壓V2Step 603 , the voltage monitoring circuit 210 generates a first monitoring voltage V 1 and a second monitoring voltage V 2 indicating the second output voltage V S .

步驟604,控制器220中的高箝位端HCP接收第二監測電壓V2和控制器220中的低箝位端LCP接收第一監測電壓V1Step 604 , the high clamp terminal HCP in the controller 220 receives the second monitoring voltage V 2 and the low clamp terminal LCP in the controller 220 receives the first monitoring voltage V 1 .

步驟605,如果第二監測電壓V2大於高電壓臨限值VSH且第一監測電壓V1大於低電壓臨限值VSL,即比較器EA2輸出高電位且比較器EA1輸出低電位,步驟605轉至步驟606。否則步驟605轉至步驟609。 Step 605, if the second monitoring voltage V 2 is greater than the high voltage threshold value V SH and the first monitoring voltage V 1 is greater than the low voltage threshold value V SL , that is, the comparator EA2 outputs a high level and the comparator EA1 outputs a low level, step 605 Go to step 606. Otherwise step 605 goes to step 609 .

步驟606,第一邏輯電路313不輸出第一加法信號;第二邏輯電路314輸出第一減法信號。 Step 606, the first logic circuit 313 does not output the first addition signal; the second logic circuit 314 outputs the first subtraction signal.

步驟607,轉換單元315根據該第一減法信號產生第一調節電流IADJF1並輸出至電壓感應電路230,以增加電壓感應電路230產生的電壓感應信號VSEN(未經調節的電壓感應信號VSEN)並產生調節後的電壓感應信號VSENIn step 607, the conversion unit 315 generates a first adjustment current I ADJF1 according to the first subtraction signal and outputs it to the voltage sensing circuit 230 to increase the voltage sensing signal V SEN (the unadjusted voltage sensing signal V SEN ) generated by the voltage sensing circuit 230. ) and generate the adjusted voltage sensing signal V SEN .

步驟608,此時,該調節後的電壓感應信號VSEN大於電壓基準信號VREF,第一控制電流ICMPO1減小。光耦合器240根據該減小後的第一控制電流ICMPO1輸出處於第一狀態的第一控制信號S1。電能轉換器103根據該處於第一狀態的第一控制信號S1減小第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內。隨後,步驟608轉至步驟604。 Step 608, at this time, the adjusted voltage sensing signal V SEN is greater than the voltage reference signal V REF , and the first control current I CMPO1 decreases. The optical coupler 240 outputs the first control signal S1 in the first state according to the reduced first control current I CMPO1 . The power converter 103 reduces the second output voltage V S according to the first control signal S1 in the first state, so that the second output voltage V S is within a preset voltage range. Subsequently, step 608 goes to step 604 .

步驟609,如果第二監測電壓V2小於高電壓臨限值VSH且第一監測電壓V1小於低電壓臨限值VSL,即比較器EA2輸出低電位且比較器EA1輸出高電位,步驟609轉至步驟610。否則步驟609轉至步驟613。 Step 609, if the second monitoring voltage V 2 is less than the high voltage threshold value V SH and the first monitoring voltage V 1 is less than the low voltage threshold value V SL , that is, the comparator EA2 outputs a low level and the comparator EA1 outputs a high level, step 609 Go to step 610. Otherwise step 609 goes to step 613 .

步驟610,第一邏輯電路313輸出第一加法信號;第二邏輯電路314不輸出第一減法信號。 Step 610, the first logic circuit 313 outputs the first addition signal; the second logic circuit 314 does not output the first subtraction signal.

步驟611,轉換單元315根據第一加法信號產生第一調節電流IADJF1並將第一調節電流IADJF1從電壓感應電路230流入轉換單元315,以減小電壓感應電路230產生的電壓感應信號VSEN(未經調節的電壓感應信號VSEN)並產生調節後的電壓感應信號VSENStep 611 , the conversion unit 315 generates a first adjustment current I ADJF1 according to the first addition signal and flows the first adjustment current I ADJF1 from the voltage sensing circuit 230 into the conversion unit 315 to reduce the voltage sensing signal V SEN generated by the voltage sensing circuit 230 (unregulated voltage sense signal VSEN ) and generate regulated voltage sense signal VSEN .

步驟612,此時,該調節後的電壓感應信號VSEN小於電壓基準信號VREF,第一控制電流ICMPO1增加。光耦合器240根據該增加後的第一控制電流ICMPO1輸出處於第二狀態的第一控制信號S1。電能轉換器103根據該處於第二狀態的第一控制信號S1增加第二輸出電壓VS,以使第二輸出電壓VS處於預設電壓範圍內。隨後,步驟612轉至步驟604。 Step 612, at this time, the adjusted voltage sensing signal V SEN is smaller than the voltage reference signal V REF , and the first control current I CMPO1 increases. The optical coupler 240 outputs the first control signal S1 in the second state according to the increased first control current I CMPO1 . The power converter 103 increases the second output voltage V S according to the first control signal S1 in the second state, so that the second output voltage V S is within a predetermined voltage range. Then, step 612 goes to step 604 .

步驟613,如果第二監測電壓V2小於高電壓臨限值VSH且第一監測電壓V1大於低電壓臨限值VSL,即比較器EA2輸出低電位且比較器EA1輸出低電位,步驟613轉至步驟614。否則,步驟613轉至步驟604。 Step 613 , if the second monitoring voltage V 2 is less than the high voltage threshold value V SH and the first monitoring voltage V 1 is greater than the low voltage threshold value V SL , that is, the comparator EA2 outputs a low level and the comparator EA1 outputs a low level, step 613 Go to step 614. Otherwise, step 613 goes to step 604 .

步驟614,電流檢測端ISEN1、ISEN2、......、ISENN感應光源電流I1、I2、......、INIn step 614, the current detection terminals ISEN1, ISEN2, ..., ISENN sense the light source currents I 1 , I 2 , ..., I N .

步驟615,電流感應與均衡電路320均衡光源電流I1、I2、......、IN,並產生電流回饋信號SISENStep 615 , the current sensing and equalization circuit 320 equalizes the light source currents I 1 , I 2 , . . . , I N , and generates a current feedback signal S ISEN .

步驟616,如果電流基準信號SADJ大於電流回饋信號SISEN,比較器EA3輸出高電位且比較器EA4輸出低電位,步驟616轉至步驟617。否則,比較器EA3輸出低電位且比較器EA4輸出高電位,步驟616轉至步驟620。 Step 616 , if the current reference signal S ADJ is greater than the current feedback signal S ISEN , the comparator EA3 outputs a high level and the comparator EA4 outputs a low level, and step 616 goes to step 617 . Otherwise, the comparator EA3 outputs a low level and the comparator EA4 outputs a high level, and step 616 goes to step 620 .

步驟617,第一邏輯電路313接收該高電位並輸出第二加法信號,第二邏輯電路314接收該低電位但不輸出第二減法信號。 Step 617, the first logic circuit 313 receives the high level and outputs the second addition signal, and the second logic circuit 314 receives the low level but does not output the second subtraction signal.

步驟618,轉換單元315根據該第二加法信號產生第二調節電流IADJF2 並將第二調節電流IADJF2從電壓感應電路230注入轉換單元315,以減小調節後的電壓感應信號VSEN並產生二次調節後的電壓感應信號VSENStep 618, the conversion unit 315 generates a second adjustment current I ADJF2 according to the second addition signal and injects the second adjustment current I ADJF2 from the voltage sensing circuit 230 into the conversion unit 315 to reduce the adjusted voltage sensing signal V SEN and generate The voltage sensing signal V SEN after the secondary adjustment.

步驟619,此時,該二次調節後的電壓感應信號VSEN小於電壓基準信號VREF,第二控制電流ICMPO2增加。光耦合器240根據該增加後的第二控制電流ICMPO2輸出處於第二狀態的第二控制信號S2。電能轉換器103根據該處於第二狀態的第二控制信號S2增加第一輸出電壓VOUT,以使光源電流I1、I2、......、IN增加為目標電流值。隨後,步驟619轉至步驟604。 Step 619, at this time, the voltage sensing signal V SEN after the secondary adjustment is smaller than the voltage reference signal V REF , and the second control current I CMPO2 increases. The optical coupler 240 outputs the second control signal S2 in the second state according to the increased second control current I CMPO2 . The power converter 103 increases the first output voltage V OUT according to the second control signal S2 in the second state, so as to increase the light source currents I 1 , I 2 , . . . , IN to the target current value. Then, step 619 goes to step 604 .

步驟620,第一邏輯電路313接收低電位但不輸出第二加法信號,第二邏輯電路314接收高電位並輸出第二減法信號。 In step 620, the first logic circuit 313 receives the low level but does not output the second addition signal, and the second logic circuit 314 receives the high level and outputs the second subtraction signal.

步驟621,轉換單元315根據該第二減法信號產生第二調節電流IADJF2並輸出至電壓感應電路230,以增加調節後的電壓感應信號VSEN並產生二次調節後的電壓感應信號VSENStep 621 , the converting unit 315 generates a second adjustment current I ADJF2 according to the second subtraction signal and outputs it to the voltage sensing circuit 230 to increase the adjusted voltage sensing signal V SEN and generate a second adjusted voltage sensing signal V SEN .

步驟622,此時,該二次調節後的電壓感應信號VSEN大於電壓基準信號VREF,第二控制電流ICMPO2減小。光耦合器240根據該減小後的第二控制電流ICMPO2輸出處於第一狀態的第二控制信號S2。電能轉換器103根據該處於第一狀態的第二控制信號S2減小第一輸出電壓VOUT,以使光源電流I1、I2、......、IN減小為目標電流值。隨後,步驟622轉至步驟604。 Step 622, at this time, the voltage sensing signal V SEN after the secondary adjustment is greater than the voltage reference signal V REF , and the second control current I CMPO2 decreases. The optical coupler 240 outputs the second control signal S2 in the first state according to the reduced second control current I CMPO2 . The power converter 103 reduces the first output voltage V OUT according to the second control signal S2 in the first state, so as to reduce the light source currents I 1 , I 2 , . . . , IN to the target current value . Then, step 622 goes to step 604 .

如前該,本發明披露了一種控制器、光源驅動系統及方法。該光源驅動系統優先根據第一輸出電壓VOUT及第二輸出電壓VS調節第二輸出電壓VS以使第二輸出電壓VS處於預設電壓範圍內。當第二輸出電壓VS處於預設電壓範圍內時,該光源驅動系統再根據第一輸出電壓VOUT和光源電流調節第一輸出電壓VOUT以使光源電流保持為目標電流值。該光源驅動系統透過調節第一輸出電壓VOUT和第二輸出電壓VS,一方面可使光源工作在最佳狀態(光源電流保持為目標電流值),減少功耗,提高功率效率,另一方面還可相容多種顯示器而無需任何 更改,設計更簡易。 As mentioned above, the present invention discloses a controller, a light source driving system and a method. The light source driving system preferentially adjusts the second output voltage V S according to the first output voltage V OUT and the second output voltage V S so that the second output voltage V S is within a predetermined voltage range. When the second output voltage V S is within the preset voltage range, the light source driving system adjusts the first output voltage V OUT according to the first output voltage V OUT and the light source current to keep the light source current at the target current value. By adjusting the first output voltage V OUT and the second output voltage V S , the light source driving system can make the light source work in the best state (the light source current is kept at the target current value), reduce power consumption and improve power efficiency, on the other hand Aspects are also compatible with multiple monitors without any changes, making the design easier.

在此使用之措辭和表達都是用於說明而非限制,使用這些措辭和表達並不將在此圖示和描述的特性之任何等同物(或部分等同物)排除在發明範圍之外,在申請專利範內可能存在各種修改。其它的修改、變體和替換物也可能存在。因此,申請專利範旨在涵蓋所有此類等同物。 The words and expressions used herein are for the purpose of description and not of limitation, and the use of these words and expressions does not exclude from the scope of the invention any equivalents (or partial equivalents) of the features illustrated and described herein. Various modifications may exist within the scope of the patent application. Other modifications, variations and alternatives may also exist. Accordingly, the patent application is intended to cover all such equivalents.

100:光源驅動系統 100: Light source drive system

102:整流器 102: Rectifier

103:電能轉換器 103: Power Converter

104:光源 104: Light source

105:控制電路 105: Control circuit

Claims (37)

一種控制器,用於控制一電能轉換器產生的為一光源供電的一第一輸出電壓及為該光源以外的一元件供電的一第二輸出電壓,該控制器包括:一電壓檢測端,用於感應該第二輸出電壓;一電流檢測端,耦接該光源,用於感應流過該光源的一光源電流,其中,該第二輸出電壓先於該光源電流被感應到;及一電壓感應端,經由一電壓感應電路與該電能轉換器耦接,用於接收指示該第一輸出電壓的一電壓感應信號,其中該電壓感應信號由該電壓感應電路產生;其中,該控制器根據該第二輸出電壓調節該電壓感應信號以產生一調節後的電壓感應信號,並根據該調節後的電壓感應信號產生一第一控制電流,以使該電能轉換器根據該第一控制電流控制該第二輸出電壓處於一預設電壓範圍內;以及其中,當該第二輸出電壓處於該預設電壓範圍內時,該控制器再根據該光源電流與一目標電流值之間的一差值調節該調節後的電壓感應信號以產生一二次調節後的電壓感應信號,並根據該二次調節後的電壓感應信號產生一第二控制電流,以使該電能轉換器根據該第二控制電流控制該光源電流保持為該目標電流值。 A controller for controlling a first output voltage generated by an electric energy converter to supply power to a light source and a second output voltage to supply power to an element other than the light source, the controller comprises: a voltage detection terminal, which is used for inducing the second output voltage; a current detection terminal coupled to the light source for inducing a light source current flowing through the light source, wherein the second output voltage is sensed before the light source current; and a voltage sensing The terminal is coupled to the power converter through a voltage sensing circuit, and is used for receiving a voltage sensing signal indicating the first output voltage, wherein the voltage sensing signal is generated by the voltage sensing circuit; wherein, the controller is based on the first output voltage. Two output voltages adjust the voltage sensing signal to generate an adjusted voltage sensing signal, and generate a first control current according to the adjusted voltage sensing signal, so that the power converter controls the second control current according to the first control current The output voltage is within a preset voltage range; and wherein, when the second output voltage is within the preset voltage range, the controller adjusts the adjustment according to a difference between the light source current and a target current value The voltage sensing signal after the second adjustment is used to generate a voltage sensing signal after the secondary adjustment, and a second control current is generated according to the voltage sensing signal after the secondary adjustment, so that the power converter controls the light source according to the second control current. The current remains at this target current value. 如請求項1之控制器,還包括: 一調節端,耦接該電壓感應電路,用於傳輸指示該第二輸出電壓的一第一調節電流以調節該電壓感應信號,進而使該第二輸出電壓處於該預設電壓範圍內;其中,該第一調節電流由該控制器中的一比較與回饋電路產生;其中,當該第二輸出電壓處於該預設電壓範圍內時,該調節端傳輸指示該光源電流與該目標電流值之間的差值的一第二調節電流以調節該調節後的電壓感應信號,進而使該光源電流保持為該目標電流值;其中,該第二調節電流由該比較與回饋電路產生。 If the controller of claim 1, it also includes: an adjustment terminal, coupled to the voltage sensing circuit, for transmitting a first adjustment current indicating the second output voltage to adjust the voltage sensing signal so that the second output voltage is within the preset voltage range; wherein, The first adjustment current is generated by a comparison and feedback circuit in the controller; wherein, when the second output voltage is within the preset voltage range, the adjustment terminal transmits an indication between the light source current and the target current value A second adjustment current of the difference is adjusted to adjust the adjusted voltage sensing signal, so as to keep the light source current at the target current value; wherein, the second adjustment current is generated by the comparison and feedback circuit. 如請求項2之控制器,其中,如果該光源電流大於該目標電流值,該比較與回饋電路產生該第二調節電流以增加該調節後的電壓感應信號;如果該光源電流小於該目標電流值,該比較與回饋電路產生該第二調節電流以減小該調節後的電壓感應信號。 The controller of claim 2, wherein if the light source current is greater than the target current value, the comparison and feedback circuit generates the second adjustment current to increase the adjusted voltage sensing signal; if the light source current is smaller than the target current value , the comparison and feedback circuit generates the second adjustment current to reduce the adjusted voltage sensing signal. 如請求項2之控制器,其中,該電壓檢測端包括:一低箝位端,耦接一電壓監測電路,用於接收指示該第二輸出電壓的一第一監測電壓;及一高箝位端,耦接該電壓監測電路,用於接收指示該第二輸出電壓的一第二監測電壓;其中,該第一監測電壓和該第二監測電壓由該電壓監測電路根據該第二輸出電壓產生;其中,該比較與回饋電路根據該第一監測電壓與一低電壓臨限值的一第一比較結果且根據該第二監測電壓與一高電壓臨限值的一第二比較結果,產生該第一調節電流。 The controller of claim 2, wherein the voltage detection terminal comprises: a low clamping terminal coupled to a voltage monitoring circuit for receiving a first monitoring voltage indicating the second output voltage; and a high clamping terminal terminal, coupled to the voltage monitoring circuit for receiving a second monitoring voltage indicating the second output voltage; wherein the first monitoring voltage and the second monitoring voltage are generated by the voltage monitoring circuit according to the second output voltage ; wherein, the comparison and feedback circuit generates the The first regulates the current. 如請求項4之控制器,其中,當該第一比較結果為該第一監測電壓低於該低電壓臨限值且該第二比較結果為該第二監測電壓不高於該高電壓臨限值時,該第一調節電流流入該控制器以減小該電壓感應信號。 The controller of claim 4, wherein when the first comparison result is that the first monitoring voltage is lower than the low voltage threshold and the second comparison result is that the second monitoring voltage is not higher than the high voltage threshold value, the first regulation current flows into the controller to reduce the voltage sensing signal. 如請求項4之控制器,其中,當該第一比較結果為該第一監測電壓不低於該低電壓臨限值且該第二比較結果為該第二監測電壓高於該高電壓臨限值時,該第一調節電流從該控制器流出以增加該電壓感應信號。 The controller of claim 4, wherein when the first comparison result is that the first monitoring voltage is not lower than the low voltage threshold and the second comparison result is that the second monitoring voltage is higher than the high voltage threshold value, the first regulating current flows from the controller to increase the voltage sensing signal. 如請求項4之控制器,其中,當該第一比較結果為該第一監測電壓不低於該低電壓臨限值且該第二比較結果為該第二監測電壓不高於該高電壓臨限值時,該調節端傳輸該第二調節電流以使該光源電流保持為該目標電流值。 The controller of claim 4, wherein when the first comparison result is that the first monitoring voltage is not lower than the low voltage threshold and the second comparison result is that the second monitoring voltage is not higher than the high voltage threshold When the limit is reached, the adjustment terminal transmits the second adjustment current to keep the light source current at the target current value. 如請求項4之控制器,其中,該比較與回饋電路包括:一第一比較器,該第一比較器的一非反相輸入端設置該低電壓臨限值,該第一比較器的一反相輸入端耦接該低箝位端,以接收該第一監測電壓,該第一比較器的一輸出端輸出該第一比較器根據該第一監測電壓和該低電壓臨限值產生的該第一比較結果;及一第二比較器,該第二比較器的一非反相輸入端耦接該高箝位端,以接收該第二監測電壓,該第二比較器的一反相輸入端設置該高電壓臨限值,該第二比較器的一輸出端輸出該第二比較器根據該第二監測電壓和該高電壓臨限值產生的該第二比較結果。 The controller of claim 4, wherein the comparison and feedback circuit comprises: a first comparator, a non-inverting input terminal of the first comparator sets the low voltage threshold, a first comparator The inverting input terminal is coupled to the low clamp terminal to receive the first monitoring voltage, and an output terminal of the first comparator outputs a voltage generated by the first comparator according to the first monitoring voltage and the low voltage threshold value. the first comparison result; and a second comparator, a non-inverting input terminal of the second comparator is coupled to the high clamp terminal to receive the second monitoring voltage, an inverting phase of the second comparator The input terminal sets the high voltage threshold value, and an output terminal of the second comparator outputs the second comparison result generated by the second comparator according to the second monitoring voltage and the high voltage threshold value. 如請求項8之控制器,其中,該比較與回饋電路還包括:一第一邏輯電路,耦接該第一比較器,用於根據該第一比較結果輸出一第一加法信號; 一第二邏輯電路,耦接該第二比較器,用於根據該第二比較結果輸出一第一減法信號;及一轉換單元,耦接該第一邏輯電路和該第二邏輯電路,用於根據該第一加法信號產生該第一調節電流以減小該電壓感應信號,並且還用於根據該第一減法信號產生該第一調節電流以增加該電壓感應信號。 The controller of claim 8, wherein the comparison and feedback circuit further comprises: a first logic circuit, coupled to the first comparator, for outputting a first addition signal according to the first comparison result; a second logic circuit, coupled to the second comparator, for outputting a first subtraction signal according to the second comparison result; and a conversion unit, coupled to the first logic circuit and the second logic circuit, for outputting a first subtraction signal The first adjustment current is generated according to the first addition signal to reduce the voltage induction signal, and is also used for generating the first adjustment current according to the first subtraction signal to increase the voltage induction signal. 如請求項9之控制器,其中,如果該光源電流大於該目標電流值,該第二邏輯電路輸出一第二減法信號,該轉換單元根據該第二減法信號產生該第二調節電流以增加該調節後的電壓感應信號;如果該光源電流小於該目標電流值,該第一邏輯電路輸出一第二加法信號,該轉換單元根據該第二加法信號產生該第二調節電流以減小該調節後的電壓感應信號。 The controller of claim 9, wherein if the light source current is greater than the target current value, the second logic circuit outputs a second subtraction signal, and the conversion unit generates the second adjustment current according to the second subtraction signal to increase the The adjusted voltage sensing signal; if the light source current is less than the target current value, the first logic circuit outputs a second addition signal, and the conversion unit generates the second adjustment current according to the second addition signal to reduce the adjusted current voltage sensing signal. 如請求項1之控制器,還包括:一驅動器,耦接該控制器中的一致能端,用於根據一電壓信號產生一驅動信號;其中,該致能端在該光源被點亮時產生該電壓信號;其中,耦接該電能轉換器的一負載單元根據該驅動信號導通並持續導通一預設時間段,以減小該第一輸出電壓。 The controller of claim 1, further comprising: a driver coupled to an enabling terminal in the controller for generating a driving signal according to a voltage signal; wherein the enabling terminal is generated when the light source is lit the voltage signal; wherein, a load unit coupled to the power converter is turned on according to the driving signal and continuously turned on for a predetermined period of time to reduce the first output voltage. 如請求項1之控制器,還包括:一脈波寬度調變端,用於接收指示該光源的一預設亮度的一調光信號;及一電流感應與均衡電路,用於根據該調光信號控制與該光源耦接的一多個MOS晶體的一工作模式並均衡該光源電流;其中該電流感應與均衡電路包括該多個MOS晶體。 The controller of claim 1, further comprising: a pulse width modulation terminal for receiving a dimming signal indicating a preset brightness of the light source; and a current sensing and equalization circuit for dimming according to the dimming The signal controls a working mode of a plurality of MOS crystals coupled to the light source and equalizes the light source current; wherein the current sensing and equalization circuit includes the plurality of MOS crystals. 如請求項12之控制器,其中,該工作模式包括一線性模式和一開關模式;當該預設亮度處於一第一亮度範圍時,該電流感應與均衡電路控制該 多個MOS晶體工作在該線性模式;當該預設亮度處於一第二亮度範圍時,該電流感應與均衡電路控制該多個MOS晶體工作在該開關模式。 The controller of claim 12, wherein the working mode includes a linear mode and a switching mode; when the preset brightness is within a first brightness range, the current sensing and equalization circuit controls the The plurality of MOS crystals work in the linear mode; when the preset brightness is within a second brightness range, the current sensing and equalization circuit controls the plurality of MOS crystals to work in the switch mode. 一種光源驅動系統,包括:一電能轉換器,用於將一輸入電能轉換成為一光源供電的一第一輸出電壓及為該系統中除該光源以外的一元件供電的一第二輸出電壓;一控制電路,耦接該電能轉換器及該光源,用於感應該第一輸出電壓、該第二輸出電壓及流過該光源的一光源電流,其中,該第一輸出電壓和該第二輸出電壓均先於該光源電流被感應到,其中,該控制電路根據該第一輸出電壓產生一電壓感應信號,並根據該第二輸出電壓調節該電壓感應信號以產生一調節後的電壓感應信號,再根據該調節後的電壓感應信號產生一第一控制信號,以使該電能轉換器根據該第一控制信號控制該第二輸出電壓處於一預設電壓範圍內;以及其中,當該第二輸出電壓處於該預設電壓範圍內時,該控制電路根據該光源電流調節該調節後的電壓感應信號以產生一二次調節後的電壓感應信號,再根據該二次調節後的電壓感應信號產生一第二控制信號,以使該電能轉換器根據該第二控制信號控制該光源電流保持為一目標電流值。 A light source driving system, comprising: a power converter for converting an input power into a first output voltage for powering a light source and a second output voltage for powering an element in the system except the light source; a a control circuit, coupled to the power converter and the light source, for sensing the first output voltage, the second output voltage and a light source current flowing through the light source, wherein the first output voltage and the second output voltage Both are sensed before the light source current, wherein the control circuit generates a voltage sensing signal according to the first output voltage, and adjusts the voltage sensing signal according to the second output voltage to generate an adjusted voltage sensing signal, and then A first control signal is generated according to the adjusted voltage sensing signal, so that the power converter controls the second output voltage to be within a predetermined voltage range according to the first control signal; and wherein, when the second output voltage When within the preset voltage range, the control circuit adjusts the adjusted voltage sensing signal according to the light source current to generate a secondary adjusted voltage sensing signal, and then generates a second voltage sensing signal according to the secondary adjusted voltage sensing signal. two control signals, so that the power converter controls the light source current to maintain a target current value according to the second control signal. 如請求項14之光源驅動系統,其中,該控制電路包括:一電壓監測電路,耦接該電能轉換器,用於感應該第二輸出電壓並產生指示該第二輸出電壓的一第一監測電壓和一第二監測電壓;一控制器,耦接該光源和該電壓監測電路,用於產生一第一調節電流和一第二調節電流;其中,該第一調節電流先於該第二調節電流產生,其中該第一調節電流 指示該第一監測電壓和該第二監測電壓,該第二調節電流指示該光源電流與該目標電流值之間的一差值;及一電壓感應電路,耦接該電能轉換器,用於產生指示該第一輸出電壓的該電壓感應信號,其中,該第一調節電流調節該電壓感應信號以產生該調節後的電壓感應信號;其中,該控制器根據該調節後的電壓感應信號和一電壓基準信號的一比較結果產生一第一控制電流;該光源驅動系統中的一光耦合器根據該第一控制電流產生該第一控制信號,以使該電能轉換器根據該第一控制信號控制該第二輸出電壓處於該預設電壓範圍內;當該第二輸出電壓處於該預設電壓範圍內時,該控制器產生該第二調節電流,以使該光源電流保持為該目標電流值。 The light source driving system of claim 14, wherein the control circuit comprises: a voltage monitoring circuit, coupled to the power converter, for sensing the second output voltage and generating a first monitoring voltage indicative of the second output voltage and a second monitoring voltage; a controller, coupled to the light source and the voltage monitoring circuit, for generating a first regulating current and a second regulating current; wherein the first regulating current precedes the second regulating current is generated where the first regulated current indicating the first monitoring voltage and the second monitoring voltage, the second regulating current indicates a difference between the light source current and the target current value; and a voltage sensing circuit coupled to the power converter for generating The voltage sensing signal indicating the first output voltage, wherein the first adjusting current adjusts the voltage sensing signal to generate the adjusted voltage sensing signal; wherein the controller is based on the adjusted voltage sensing signal and a voltage A comparison result of the reference signals generates a first control current; an optocoupler in the light source driving system generates the first control signal according to the first control current, so that the power converter controls the power converter according to the first control signal The second output voltage is within the preset voltage range; when the second output voltage is within the preset voltage range, the controller generates the second regulation current to keep the light source current at the target current value. 如請求項15之光源驅動系統,其中,當該第一監測電壓低於一低電壓臨限值且該第二監測電壓不高於一高電壓臨限值時,該第一調節電流流入該控制器以減小該電壓感應信號。 The light source driving system of claim 15, wherein when the first monitoring voltage is lower than a low voltage threshold and the second monitoring voltage is not higher than a high voltage threshold, the first regulation current flows into the control device to reduce the voltage induced signal. 如請求項15之光源驅動系統,其中,當該第一監測電壓不低於一低電壓臨限值且該第二監測電壓高於一高電壓臨限值時,該第一調節電流從該控制器流出以增加該電壓感應信號。 The light source driving system of claim 15, wherein when the first monitoring voltage is not lower than a low voltage threshold and the second monitoring voltage is higher than a high voltage threshold, the first regulation current is controlled from the control to increase the voltage sense signal. 如請求項15之光源驅動系統,其中,當該第一監測電壓不低於一低電壓臨限值且該第二監測電壓不高於一高電壓臨限值時,該控制器產生該第二調節電流以使該光源電流保持為該目標電流值。 The light source driving system of claim 15, wherein when the first monitoring voltage is not lower than a low voltage threshold value and the second monitoring voltage is not higher than a high voltage threshold value, the controller generates the second monitoring voltage The current is adjusted to keep the light source current at the target current value. 如請求項15之光源驅動系統,其中,如果該光源電流大於該目標電流值,該控制器產生該第二調節電流以增加該調節後的電壓感應信號;如果 該光源電流小於該目標電流值,該控制器產生該第二調節電流以減小該調節後的電壓感應信號。 The light source driving system of claim 15, wherein, if the light source current is greater than the target current value, the controller generates the second adjustment current to increase the adjusted voltage sensing signal; if The light source current is less than the target current value, and the controller generates the second adjustment current to reduce the adjusted voltage sensing signal. 如請求項15之光源驅動系統,其中,該控制器包括:一第一比較器,該第一比較器的一非反相輸入端設置一低電壓臨限值,該第一比較器的一反相輸入端耦接該電壓監測電路,以接收該第一監測電壓,該第一比較器的一輸出端輸出該第一比較器根據該第一監測電壓和該低電壓臨限值產生的一第一比較結果;及一第二比較器,該第二比較器的一非反相輸入端耦接該電壓監測電路,以接收該第二監測電壓,該第二比較器的一反相輸入端設置一高電壓臨限值,該第二比較器的一輸出端輸出該第二比較器根據該第二監測電壓和該高電壓臨限值產生的一第二比較結果。 The light source driving system of claim 15, wherein the controller comprises: a first comparator, a non-inverting input terminal of the first comparator is set with a low voltage threshold value, an inverting input terminal of the first comparator is The phase input terminal is coupled to the voltage monitoring circuit to receive the first monitoring voltage. An output terminal of the first comparator outputs a first comparator generated by the first comparator according to the first monitoring voltage and the low voltage threshold. a comparison result; and a second comparator, a non-inverting input terminal of the second comparator is coupled to the voltage monitoring circuit to receive the second monitoring voltage, an inverting input terminal of the second comparator is set A high voltage threshold value, an output end of the second comparator outputs a second comparison result generated by the second comparator according to the second monitoring voltage and the high voltage threshold value. 如請求項20之光源驅動系統,其中,該控制器還包括:一第一邏輯電路,耦接該第一比較器,用於根據該第一比較結果輸出一第一加法信號;一第二邏輯電路,耦接該第二比較器,用於根據該第二比較結果輸出一第一減法信號;及一轉換單元,耦接該第一邏輯電路和該第二邏輯電路,用於根據該第一加法信號產生該第一調節電流以減小該電壓感應信號,並且還用於根據該第一減法信號產生該第一調節電流以增加該電壓感應信號。 The light source driving system of claim 20, wherein the controller further comprises: a first logic circuit, coupled to the first comparator, for outputting a first addition signal according to the first comparison result; a second logic circuit a circuit, coupled to the second comparator, for outputting a first subtraction signal according to the second comparison result; and a conversion unit, coupled to the first logic circuit and the second logic circuit, for outputting a first subtraction signal according to the first The addition signal generates the first adjustment current to reduce the voltage induction signal, and is also used to generate the first adjustment current according to the first subtraction signal to increase the voltage induction signal. 如請求項21之光源驅動系統,其中,如果該光源電流大於該目標電流值,該第二邏輯電路輸出一第二減法信號,該轉換單元根據該第二減法信號產生該第二調節電流以增加調節後的電壓感應信號;如果該光源電流小於該 目標電流值,該第一邏輯電路輸出一第二加法信號,該轉換單元根據該第二加法信號產生該第二調節電流以減小該調節後的電壓感應信號。 The light source driving system of claim 21, wherein if the light source current is greater than the target current value, the second logic circuit outputs a second subtraction signal, and the conversion unit generates the second adjustment current to increase according to the second subtraction signal Adjusted voltage sensing signal; if the light source current is less than the A target current value, the first logic circuit outputs a second addition signal, and the conversion unit generates the second adjustment current according to the second addition signal to reduce the adjusted voltage sensing signal. 如請求項15之光源驅動系統,其中,該控制器包括:一驅動器,耦接該系統中的一負載單元,用於根據一電壓信號控制該負載單元導通並持續導通一預設時間段,以減小該第一輸出電壓;其中該電壓信號是由該控制器在該光源被點亮時產生。 The light source driving system of claim 15, wherein the controller comprises: a driver, coupled to a load unit in the system, for controlling the load unit to be turned on and continuously turned on for a predetermined period of time according to a voltage signal, so as to reducing the first output voltage; wherein the voltage signal is generated by the controller when the light source is lit. 如請求項15之光源驅動系統,其中,該控制器包括:一電流感應與均衡電路,用於根據指示該光源的一預設亮度的一調光信號控制與該光源耦接的一多個MOS晶體的一工作模式並均衡該光源電流;其中該電流感應與均衡電路包括該多個MOS晶體。 The light source driving system of claim 15, wherein the controller comprises: a current sensing and equalization circuit for controlling a plurality of MOSs coupled to the light source according to a dimming signal indicating a preset brightness of the light source A working mode of the crystal and equalizing the light source current; wherein the current sensing and equalizing circuit includes the plurality of MOS crystals. 如請求項24之光源驅動系統,其中,該工作模式包括一線性模式和一開關模式;當該預設亮度處於一第一亮度範圍時,該電流感應與均衡電路控制該多個MOS晶體工作在該線性模式;當該預設亮度處於一第二亮度範圍時,該電流感應與均衡電路控制該多個MOS晶體工作在該開關模式。 The light source driving system of claim 24, wherein the operating mode includes a linear mode and a switching mode; when the preset brightness is within a first brightness range, the current sensing and equalization circuit controls the plurality of MOS crystals to operate in a the linear mode; when the preset brightness is in a second brightness range, the current sensing and equalization circuit controls the plurality of MOS crystals to work in the switch mode. 一種光源驅動方法,包括:一電能轉換器將一輸入電能轉換成為一光源供電的一第一輸出電壓及為該光源以外的一元件供電的一第二輸出電壓;一控制電路感應該第一輸出電壓、該第二輸出電壓及流過該光源的一光源電流;其中,該第一輸出電壓及該第二輸出電壓均先於該光源電流被感應到;該控制電路產生指示該第一輸出電壓的一電壓感應信號;該控制電路根據該第二輸出電壓調節該電壓感應信號以產生一調節後的電壓感應信號,再根據該調節後的電壓感應信號產生一第一控制信號; 該電能轉換器根據該第一控制信號調節該第二輸出電壓,以使該第二輸出電壓處於一預設電壓範圍內;當該第二輸出電壓處於該預設電壓範圍內時,該控制電路根據該光源電流調節該調節後的電壓感應信號以產生一二次調節後的電壓感應信號,再根據該二次調節後的電壓感應信號產生一第二控制信號;及該電能轉換器根據該第二控制信號調節該第一輸出電壓,以使該光源電流保持為一目標電流值。 A light source driving method, comprising: a power converter converts an input power into a first output voltage for powering a light source and a second output voltage for powering an element other than the light source; a control circuit senses the first output voltage, the second output voltage and a light source current flowing through the light source; wherein, the first output voltage and the second output voltage are both sensed before the light source current; the control circuit generates an indication of the first output voltage a voltage sensing signal; the control circuit adjusts the voltage sensing signal according to the second output voltage to generate an adjusted voltage sensing signal, and then generates a first control signal according to the adjusted voltage sensing signal; The power converter adjusts the second output voltage according to the first control signal, so that the second output voltage is within a predetermined voltage range; when the second output voltage is within the predetermined voltage range, the control circuit The adjusted voltage sensing signal is adjusted according to the light source current to generate a secondary adjusted voltage sensing signal, and then a second control signal is generated according to the secondary adjusted voltage sensing signal; and the power converter is based on the first control signal. Two control signals adjust the first output voltage to keep the light source current at a target current value. 如請求項26之光源驅動方法,其中,該控制電路根據該第二輸出電壓調節該電壓感應信號以產生一調節後的電壓感應信號,再根據該調節後的電壓感應信號產生一第一控制信號的步驟包括:該控制電路中的一電壓監測電路感應該第二輸出電壓並產生指示該第二輸出電壓的一第一監測電壓和一第二監測電壓;一控制器根據該第一監測電壓與一低電壓臨限值產生一第一比較結果,根據該第二監測電壓與一高電壓臨限值產生一第二比較結果;該控制器還根據該第一比較結果和該第二比較結果產生一第一調節電流;該第一調節電流調節該電壓感應信號以產生該調節後的電壓感應信號;該控制器中的一並聯調節器根據該調節後的電壓感應信號與一電壓基準信號的一比較結果產生一第一控制電流;及該控制電路中的一光耦合器根據該第一控制電流產生該第一控制信號。 The light source driving method of claim 26, wherein the control circuit adjusts the voltage sensing signal according to the second output voltage to generate an adjusted voltage sensing signal, and then generates a first control signal according to the adjusted voltage sensing signal The steps include: a voltage monitoring circuit in the control circuit senses the second output voltage and generates a first monitoring voltage and a second monitoring voltage indicating the second output voltage; a controller according to the first monitoring voltage and A low voltage threshold value generates a first comparison result, and a second comparison result is generated according to the second monitoring voltage and a high voltage threshold value; the controller also generates a second comparison result according to the first comparison result and the second comparison result a first adjustment current; the first adjustment current adjusts the voltage sensing signal to generate the adjusted voltage sensing signal; a parallel regulator in the controller is based on a relationship between the adjusted voltage sensing signal and a voltage reference signal The comparison result generates a first control current; and an optocoupler in the control circuit generates the first control signal according to the first control current. 如請求項27之光源驅動方法,其中,當該第一比較結果為該第一監測電壓低於該低電壓臨限值且該第二比較結果為該第二監測電壓不高於該高電壓臨限值時,該第一調節電流流入該控制器以減小該電壓感應信號。 The light source driving method of claim 27, wherein when the first comparison result is that the first monitoring voltage is lower than the low voltage threshold and the second comparison result is that the second monitoring voltage is not higher than the high voltage threshold At the limit, the first regulated current flows into the controller to reduce the voltage induced signal. 如請求項27之光源驅動方法,其中,當該第一比較結果為該第一監測電壓不低於該低電壓臨限值且該第二比較結果為該第二監測電壓高於該高電壓臨限值時,該第一調節電流從該控制器流出以增加該電壓感應信號。 The light source driving method of claim 27, wherein when the first comparison result is that the first monitoring voltage is not lower than the low voltage threshold value and the second comparison result is that the second monitoring voltage is higher than the high voltage threshold At the limit, the first regulated current flows from the controller to increase the voltage sensing signal. 如請求項27之光源驅動方法,其中,當該第一比較結果為該第一監測電壓不低於該低電壓臨限值且該第二比較結果為該第二監測電壓不高於該高電壓臨限值時,該控制器根據該光源電流與該目標電流值之間的一差值產生一第二調節電流,以使該光源電流保持為該目標電流值。 The light source driving method of claim 27, wherein when the first comparison result is that the first monitoring voltage is not lower than the low voltage threshold value and the second comparison result is that the second monitoring voltage is not higher than the high voltage At the threshold value, the controller generates a second adjustment current according to a difference between the light source current and the target current value, so as to keep the light source current at the target current value. 如請求項27之光源驅動方法,還包括:該控制器中的一第二比較器根據該第二監測電壓與該高電壓臨限值產生該第二比較結果;該控制器中的一第二邏輯電路根據該第二比較結果輸出一第一減法信號;及該控制器中的一轉換單元根據該第一減法信號產生該第一調節電流以增加該電壓感應信號。 The light source driving method of claim 27, further comprising: a second comparator in the controller generating the second comparison result according to the second monitoring voltage and the high voltage threshold; a second comparator in the controller The logic circuit outputs a first subtraction signal according to the second comparison result; and a conversion unit in the controller generates the first regulation current according to the first subtraction signal to increase the voltage sensing signal. 如請求項27之光源驅動方法,還包括:該控制器中的一第一比較器根據該第一監測電壓和該低電壓臨限值產生該第一比較結果;該控制器中的一第一邏輯電路根據該第一比較結果輸出一第一加法信號;及該控制器中的一轉換單元根據該第一加法信號產生該第一調節電流以減小該電壓感應信號。 The light source driving method of claim 27, further comprising: a first comparator in the controller generating the first comparison result according to the first monitoring voltage and the low voltage threshold; a first comparator in the controller The logic circuit outputs a first addition signal according to the first comparison result; and a conversion unit in the controller generates the first adjustment current according to the first addition signal to reduce the voltage sensing signal. 如請求項27之光源驅動方法,還包括:該控制器中的一第三比較器根據指示該光源電流的一電流回饋信號和指示該目標電流值的一電流基準信號產生一第三比較結果; 該控制器中的一第一邏輯電路根據該第三比較結果輸出一第二加法信號;及該控制器中的一轉換單元根據該第二加法信號產生一第二調節電流以減小該調節後的電壓感應信號。 The light source driving method of claim 27, further comprising: a third comparator in the controller generating a third comparison result according to a current feedback signal indicating the light source current and a current reference signal indicating the target current value; A first logic circuit in the controller outputs a second addition signal according to the third comparison result; and a conversion unit in the controller generates a second adjustment current according to the second addition signal to reduce the adjusted current voltage sensing signal. 如請求項27之光源驅動方法,還包括:該控制器中的一第四比較器根據指示該光源電流的一電流回饋信號和指示該目標電流值的一電流基準信號產生一第四比較結果;該控制器中的一第二邏輯電路根據該第四比較結果輸出一第二減法信號;及該控制器中的一轉換單元根據該第二減法信號產生一第二調節電流以增加該調節後的電壓感應信號。 The light source driving method of claim 27, further comprising: a fourth comparator in the controller generating a fourth comparison result according to a current feedback signal indicating the light source current and a current reference signal indicating the target current value; A second logic circuit in the controller outputs a second subtraction signal according to the fourth comparison result; and a conversion unit in the controller generates a second adjustment current according to the second subtraction signal to increase the adjusted Voltage sensing signal. 如請求項26之光源驅動方法,還包括:當該光源被點亮時,一控制器產生一電壓信號;及該控制器中的一驅動器根據該電壓信號控制一負載單元導通一預設時間段,以減小該第一輸出電壓。 The light source driving method of claim 26, further comprising: when the light source is lit, a controller generates a voltage signal; and a driver in the controller controls a load unit to conduct a predetermined period of time according to the voltage signal , to reduce the first output voltage. 如請求項26之光源驅動方法,還包括:一控制器根據指示該光源的一預設亮度的一調光信號控制一電流感應與均衡電路中一多個MOS晶體的一工作模式並均衡該光源電流。 The light source driving method of claim 26, further comprising: a controller controls an operating mode of a plurality of MOS crystals in a current sensing and equalizing circuit and equalizes the light source according to a dimming signal indicating a preset brightness of the light source current. 如請求項36之光源驅動方法,其中,該工作模式包括一線性模式和一開關模式;當該預設亮度處於一第一亮度範圍時,該電流感應與均衡電路控制該多個MOS晶體工作在該線性模式;當該預設亮度處於一第二亮度範圍時,該電流感應與均衡電路控制該多個MOS晶體工作在該開關模式。 The light source driving method of claim 36, wherein the operating mode includes a linear mode and a switching mode; when the preset brightness is within a first brightness range, the current sensing and equalization circuit controls the plurality of MOS crystals to operate in a the linear mode; when the preset brightness is in a second brightness range, the current sensing and equalization circuit controls the plurality of MOS crystals to work in the switching mode.
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