TW201618597A - LED dimming driving method and circuit thereof - Google Patents
LED dimming driving method and circuit thereof Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
Description
本發明係屬於控制照明設備光強度之技術領域,特別是關於一種利用電流訊號控制亮度之LED(Light Emitting Diode,發光二極體)調光驅動方法及其電路,以透過非PWM(Pulse Width Modulation,脈衝寬度調變)訊號控制亮度的方式提升電路效率與調光準確度。 The invention belongs to the technical field of controlling the light intensity of a lighting device, in particular to an LED (Light Emitting Diode) dimming driving method and a circuit thereof for controlling brightness by using a current signal to pass through a non-PWM (Pulse Width Modulation). , pulse width modulation) signal control brightness to improve circuit efficiency and dimming accuracy.
普遍而知的,LED燈具所採用的調光電路多利用控制相位的開關元件,例如SCR(Silicon Controlled Rectifier,矽控整流器)或TRIAC(Tri-Electrode AC Switch,雙向三極閘流體)改變輸入電源的電壓相位,以透過切換相位導通角度的方式改變整體驅動電路所輸出的驅動電壓大小而藉此調整流入LED光源的驅動電流多寡後實現調光效果。然而,此種調光設置雖具有控制簡單與安裝簡便的優點,但其輸入的電源電壓波形易處於失真狀態而造成PF低落及電壓諧波增加等問題。並且,依LED之電流/電壓(I/V)特性曲線可知,LED並非線性元件,亦即,電壓對電流之比值並非成正比,因此,前述調光方法將因驅動電壓與驅動電流之改變量不一致,而使調光效果不精確並造成虛功耗。因此,習知一驅動電路常使LED串接一電晶體及一感測電阻,以利用該感測電阻檢測LED電流後調整脈波寬度調變(Pulse Width Modulation,PWM)訊號之占空比,如此,透過此PWM訊號控制該電晶體之導通或截止即可調整輸出之驅動電壓大小而維持LED電流於一恆定狀態。 It is generally known that the dimming circuit used in LED lamps mostly uses phase-controlled switching elements such as SCR (Silicon Controlled Rectifier) or TRIAC (Tri-Electrode AC Switch) to change the input power. The voltage phase changes the driving voltage outputted by the overall driving circuit by changing the phase conduction angle, thereby adjusting the driving current flowing into the LED light source to realize the dimming effect. However, although such a dimming setting has the advantages of simple control and easy installation, the input power supply voltage waveform is easily in a distorted state, causing problems such as PF drop and voltage harmonic increase. Moreover, according to the current/voltage (I/V) characteristic curve of the LED, the LED and the nonlinear component, that is, the ratio of the voltage to the current is not proportional, therefore, the dimming method will change the driving voltage and the driving current. Inconsistent, making the dimming effect inaccurate and causing virtual power consumption. Therefore, the conventional driving circuit often connects the LEDs to a transistor and a sensing resistor to adjust the duty ratio of the Pulse Width Modulation (PWM) signal after detecting the LED current by using the sensing resistor. In this way, by controlling the on or off of the transistor through the PWM signal, the driving voltage of the output can be adjusted to maintain the LED current in a constant state.
然而,上述驅動電路雖適用於80~260V市電而方便使用,但受TRIAC的元件特性影響,當PWM訊號壓頻過低而使流經TRIAC的電 流不足其所需的工作電流時,TRIAC將出現反覆切換工作狀態的現象,造成驅動電流不連續而使LED出現閃爍問題,反之,當PWM訊號壓頻過高時,將因訊號本身的高低電壓準位變化過快而形成雜訊干擾,造成LED工作異常,降低實用性。為解決此問題,習知具一調光器10之PWM驅動電路1可如圖1所示,於一控制電路11旁額外設置一補償電路12,該補償電路12主要係由一參考電壓產生器120、一電壓取樣器121、一比較器122及一控制開關123所構成,該比較器122比較該參考電壓產生器120所產生之一參考電壓與該電壓取樣器121所形成之一取樣電壓後,於該取樣電壓低於參考電壓時輸出一控制電壓予該控制開關123,以使該補償電路12與該控制電路11形成一迴路而透過該控制開關123提供一保持電流予該控制電路11,供可確保該調光器10之工作穩定性而避免LED出現頻閃等問題發生。此種額外添置之該補償電路12雖可確穩定該調光器10的工作品質,但同時,無疑地具有一定的電能損耗而嚴重影響系統整體效率,又,此種利用TRIAC輸出電壓訊號進行調光的方式將因訊號於線路中傳輸出現損耗而影響調光準確性。 However, although the above-mentioned driving circuit is suitable for 80-260V commercial power and is convenient to use, it is affected by the component characteristics of the TRIAC, and the voltage of the PWM signal is too low to make the electricity flowing through the TRIAC. When the current is insufficient for the required operating current, the TRIAC will repeatedly switch to the working state, causing the driving current to be discontinuous and causing the LED to flicker. Otherwise, when the PWM signal is too high, the high and low voltages of the signal itself will be used. The level change is too fast and the noise interference is formed, which causes the LED to work abnormally and reduces the practicability. To solve this problem, a PWM driving circuit 1 having a dimmer 10 can be additionally provided with a compensation circuit 12, which is mainly provided by a reference voltage generator, as shown in FIG. 120, a voltage sampler 121, a comparator 122 and a control switch 123, the comparator 122 compares a reference voltage generated by the reference voltage generator 120 with a sample voltage formed by the voltage sampler 121 And outputting a control voltage to the control switch 123 when the sampling voltage is lower than the reference voltage, so that the compensation circuit 12 and the control circuit 11 form a loop through the control switch 123 to provide a holding current to the control circuit 11, It can ensure the stability of the operation of the dimmer 10 and avoid problems such as stroboscopic LEDs. The additional compensation circuit 12 can ensure the quality of the dimmer 10, but at the same time, it has a certain power loss and seriously affects the overall efficiency of the system. Moreover, the TRIAC output voltage signal is used for adjustment. The way of light will affect the dimming accuracy due to the loss of signal transmission in the line.
深感於此,如何改善LED驅動電路之調光機制與組件架構,以確保整體電路之工作效率、燈具之工作穩定度與調光準確度,即為本發明所亟欲探究之課題。 Deeply aware of this, how to improve the dimming mechanism and component architecture of the LED driver circuit to ensure the working efficiency of the whole circuit, the working stability of the lamp and the accuracy of dimming is the subject of the invention.
有鑑於習知技藝之問題,本發明之目的在於提供一種LED調光驅動方法及其電路,係採用電流訊號控制LED電流大小的方式進行調光,故不會有現行電壓訊號於傳輸時產生損耗而影響調光精準度的情況發生。 In view of the problems of the prior art, the object of the present invention is to provide an LED dimming driving method and a circuit thereof, which use a current signal to control the LED current to perform dimming, so that no current voltage signal is generated during transmission. The situation that affects the accuracy of dimming occurs.
根據本發明之目的,該LED調光驅動方法利用一LED調光驅動電路內設之一調光模組調整複數個LED組串之發光亮度,且該調光模組利用電流訊號調整該等LED組串之驅動電流大小,以實現提升線性調光準確性之效果,其特徵在於:該調光模組接收一調光訊號後,驅動內部之 一電流源輸出對應該調光訊號之電流量,接著,利用一終端電阻轉換成一電壓準位,以依據該電壓準位調節該等驅動電流而影響該等LED組串發光亮度。 According to the purpose of the present invention, the LED dimming driving method uses a dimming module disposed in an LED dimming driving circuit to adjust the brightness of the plurality of LED strings, and the dimming module adjusts the LEDs by using a current signal. The driving current of the string is used to achieve the effect of improving the linear dimming accuracy, and the dimming module receives the dimming signal and drives the internal A current source outputs a current amount corresponding to the dimming signal, and then is converted into a voltage level by using a terminating resistor to adjust the driving current according to the voltage level to affect the brightness of the LED string.
其中,該調光模組利用一電流鏡截取該驅動電流而獲知一亮度值,以比較該電壓準位與該亮度值後,透過該電流鏡調節該等驅動電流大小而實現線性調光效果。並且,該LED調光驅動方法更包含下列步驟:偵測該等LED組串之驅動電流而獲知一最低驅動電壓後,比較並調節該LED調光驅動電路內設之一週期開關之導通週期,以調節該輸出電壓之輸出總量,使確保該輸出電壓總量大於該等LED組串順向偏壓。 The dimming module uses a current mirror to intercept the driving current to obtain a brightness value, and compares the voltage level with the brightness value, and then adjusts the driving current through the current mirror to achieve a linear dimming effect. Moreover, the LED dimming driving method further comprises the steps of: detecting a driving current of the LED string and obtaining a minimum driving voltage, comparing and adjusting an on-period of a period switch of the LED dimming driving circuit, To adjust the total output of the output voltage, to ensure that the total output voltage is greater than the forward bias of the LED strings.
另一方面,根據本發明之另一目的,該LED調光驅動電路具有一轉換模組、一能量分配模組及一調光模組,該能量分配模組電性連接該轉換模組與複數個LED組串,該等LED組串電性連接該調光模組,該轉換模組內置有一變壓器,供感應一輸入電壓形成一輸出電壓後透過該能量分配模組輸出予該等LED組串,使各該LED組串上流有一驅動電流,其特徵在於:該調光模組係設有一接收器、一電流源及一控制器,該控制器設有一終端電阻並電性連接該等LED組串及該電流源,且該電流源電性連接該接收器;該接收器接收一調光訊號後,驅動該電流源輸出對應該調光訊號之電流量,以供該控制器利用該終端電阻轉換成一電壓準位而調節該等驅動電流大小。 According to another aspect of the present invention, the LED dimming driving circuit has a conversion module, an energy distribution module, and a dimming module, and the energy distribution module is electrically connected to the conversion module and the plurality of The LED string is electrically connected to the dimming module. The conversion module has a built-in transformer for sensing an input voltage to form an output voltage, and outputting the LED string to the LED distribution module through the energy distribution module. a driving current is generated on each of the LED strings, wherein the dimming module is provided with a receiver, a current source and a controller, and the controller is provided with a terminating resistor and electrically connected to the LED groups. And the current source is electrically connected to the receiver; the receiver receives a dimming signal, and drives the current source to output a current corresponding to the dimming signal for the controller to utilize the terminating resistor The driving current is adjusted by converting to a voltage level.
其中,該控制器主要係由一運算放大器、一電流鏡及該終端電阻所構成,該電流鏡一端耦接該等LED組串而另一端耦接該運算放大器之輸出端與負輸入端,且該運算放大器之正輸入端耦接該終端電阻及該電流源;該電流鏡截取該驅動電流而獲知一亮度值後,該運算放大器比較該電壓準位與該亮度值而利用該電流鏡調節該等驅動電流大小,以實現線性調光效果。 The controller is mainly composed of an operational amplifier, a current mirror and the terminating resistor. The current mirror is coupled to the LED string at one end and coupled to the output terminal and the negative input terminal of the operational amplifier at the other end, and The positive input terminal of the operational amplifier is coupled to the terminal resistor and the current source; after the current mirror intercepts the driving current to obtain a brightness value, the operational amplifier compares the voltage level with the brightness value and adjusts the current value by using the current mirror The magnitude of the drive current is such that a linear dimming effect is achieved.
又,該能量分配模組係設有一最低電壓偵測器、一誤差放大器、一比較器及一週期開關,該最低電壓偵測器耦接該等LED組串及該誤差放大器之正輸入端,且該誤差放大器之負輸入端承接一基準值而輸出端 耦接該比較器之負輸入端,該比較器之輸出端耦接該週期開關,又該週期開關兩端分別電性連接該變壓器及該等LED組串;該最低電壓偵測器偵測該等LED組串之驅動電流而獲知一最低驅動電壓,以供該誤差放大器判斷該最低驅動電壓與該基準值而獲取一誤差值,且該比較器利用一三角波比較該誤差值後調節該週期開關之導通週期而調節該輸出電壓之輸出總量,使確保該輸出電壓總量大於該等LED組串順向偏壓。 Moreover, the energy distribution module is provided with a minimum voltage detector, an error amplifier, a comparator and a period switch, and the lowest voltage detector is coupled to the LED string and the positive input of the error amplifier. And the negative input terminal of the error amplifier receives a reference value and the output end The output of the comparator is coupled to the periodic switch, and the two ends of the periodic switch are respectively electrically connected to the transformer and the LED string; the lowest voltage detector detects the Waiting for the driving current of the LED string to obtain a minimum driving voltage for the error amplifier to determine the lowest driving voltage and the reference value to obtain an error value, and the comparator uses the triangular wave to compare the error value and then adjust the periodic switch. The conduction period adjusts the total output of the output voltage to ensure that the total output voltage is greater than the forward bias of the LED strings.
綜上所述,本發明係非為透過TRIAC控制該輸入電壓相位角大小而調節該輸出電壓之輸出工作週期的方式進行調光,亦即,非利用PWM訊號調節LED光強度而無明顯調光延遲與調光失準等問題發生。 In summary, the present invention does not perform dimming in such a manner that the output period of the output voltage is adjusted by controlling the phase angle of the input voltage by the TRIAC, that is, the LED light intensity is not adjusted by the PWM signal without significant dimming. Problems such as delay and dimming misalignment occur.
1‧‧‧PWM驅動電路 1‧‧‧PWM drive circuit
10‧‧‧調光器 10‧‧‧Dimmer
11‧‧‧控制電路 11‧‧‧Control circuit
12‧‧‧補償電路 12‧‧‧Compensation circuit
120‧‧‧參考電壓產生器 120‧‧‧reference voltage generator
121‧‧‧電壓取樣器 121‧‧‧Voltage Sampler
122‧‧‧比較器 122‧‧‧ comparator
123‧‧‧控制開關 123‧‧‧Control switch
2‧‧‧LED調光驅動電路 2‧‧‧LED dimming drive circuit
20‧‧‧整流模組 20‧‧‧Rectifier Module
21‧‧‧轉換模組 21‧‧‧Transition module
210‧‧‧變壓器 210‧‧‧Transformer
211‧‧‧轉換控制器 211‧‧‧Transition controller
2110‧‧‧電流電晶體 2110‧‧‧current transistor
2111‧‧‧電流電阻 2111‧‧‧current resistance
2112‧‧‧轉換控制晶片 2112‧‧‧Transformation Control Wafer
212‧‧‧儲能電容 212‧‧‧ storage capacitor
22‧‧‧能量分配模組 22‧‧‧ energy distribution module
220‧‧‧最低電壓偵測器 220‧‧‧ Lowest Voltage Detector
221‧‧‧誤差放大器 221‧‧‧Error amplifier
222‧‧‧比較器 222‧‧‧ comparator
223‧‧‧三角波產生器 223‧‧‧ triangle wave generator
224‧‧‧週期開關 224‧‧‧cycle switch
23‧‧‧調光模組 23‧‧‧ Dimming module
230‧‧‧接收器 230‧‧‧ Receiver
231‧‧‧電流源 231‧‧‧current source
232‧‧‧控制器 232‧‧‧ Controller
2320‧‧‧運算放大器 2320‧‧‧Operational Amplifier
2321‧‧‧電流鏡 2321‧‧‧current mirror
2322‧‧‧終端電阻 2322‧‧‧Terminal resistance
2323‧‧‧第一調節器 2323‧‧‧First regulator
2324‧‧‧第二調節器 2324‧‧‧Second regulator
3‧‧‧LED組串 3‧‧‧LED string
S1~S6‧‧‧流程步驟 S1~S6‧‧‧ process steps
第1圖 係為習知PWM驅動電路之電路圖。 Figure 1 is a circuit diagram of a conventional PWM drive circuit.
第2圖 係為本發明較佳實施例之方塊圖。 Figure 2 is a block diagram of a preferred embodiment of the present invention.
第3圖 係為本發明較佳實施例之流程圖。 Figure 3 is a flow chart of a preferred embodiment of the present invention.
第4圖 係為本發明較佳實施例之電路圖。 Figure 4 is a circuit diagram of a preferred embodiment of the present invention.
為使 貴審查委員能清楚了解本發明之內容,謹以下列說明搭配圖式,敬請參閱。 In order for your review board to have a clear understanding of the contents of the present invention, please refer to the following description for matching drawings.
請參閱第2~4圖,其係分別為本發明較佳實施例之方塊圖、流程圖及電路圖。如圖所示,該LED調光驅動電路2可供諸如液晶顯示器、電視或LED燈具等設備使用而電性連接複數個LED組串3,且設有一整流模組20、一轉換模組21、一能量分配模組22及一調光模組23,該能量分配模組22電性連接該轉換模組21與該等LED組串3,又該等LED組串3電性連接該調光模組23。該整流模組20為橋式整流電路,耦接一外部電源(圖未示)及該轉換模組21,且該轉換模組21可採用諸如返馳式、順向式、全橋式、半橋式或推挽式等切換式、或LLC串聯諧振式等具有耦 合線圈之電源轉換電路作為主體架構並設置有一變壓器210及一轉換控制器211。 Please refer to FIG. 2 to FIG. 4 for a block diagram, a flow chart and a circuit diagram of a preferred embodiment of the present invention. As shown in the figure, the LED dimming driving circuit 2 can be used to connect a plurality of LED strings 3 to a device such as a liquid crystal display, a television or an LED lamp, and is provided with a rectifying module 20 and a conversion module 21, An energy distribution module 22 and a dimming module 23, the energy distribution module 22 is electrically connected to the conversion module 21 and the LED string 3, and the LED strings 3 are electrically connected to the dimming mode. Group 23. The rectifier module 20 is a bridge rectifier circuit coupled to an external power source (not shown) and the conversion module 21, and the conversion module 21 can adopt, for example, a flyback type, a forward direction, a full bridge type, and a half. Bridge or push-pull switching, or LLC series resonant, etc. The power conversion circuit of the combined coil is used as a main structure and is provided with a transformer 210 and a conversion controller 211.
以一次側控制返馳式電源轉換電路架構之該轉換模組21為例,該變壓器210具有一一次側線圈(N1)、二次側線圈(N2)及一輔助線圈(NA),該轉換控制器211設有一電流電晶體2110、一電流電阻2111及一轉換控制晶片2112,該一次側線圈串接該電流電晶體2110及該電流電阻2111後耦接該轉換控制晶片2112。該能量分配模組22設有一最低電壓偵測器220、一誤差放大器221、一比較器222、一三角波產生器223及一週期開關224,該最低電壓偵測器220耦接該等LED組串3及該誤差放大器221之正輸入端,且該誤差放大器221之負輸入端承接一基準值(Vref)而輸出端耦接該比較器222之負輸入端。該比較器222之正輸入端耦接該三角波產生器223而承接一三角波,其輸出端耦接該週期開關224,且該週期開關224兩端分別電性連接該二次側線圈及該等LED組串3。該調光模組23設有一接收器230、一電流源231及一控制器232,且該控制器232主要可由一運算放大器2320、一電流鏡2321及一終端電阻2322所構成。該電流鏡2321一端透過複數個第一調節器2323耦接該等LED組3而另一端透過一第二調節器2324耦接該運算放大器2320之輸出端與負輸入端,且該運算放大器2320之正輸入端耦接該終端電阻2322及該電流源231,又該電流源231電性連接該接收器230。 For example, the conversion module 21 that controls the flyback power conversion circuit architecture on the primary side has a primary side coil (N 1 ), a secondary side coil (N 2 ), and an auxiliary coil (N A ). The conversion controller 211 is provided with a current transistor 2110, a current resistor 2111 and a conversion control chip 2112. The primary side coil is coupled to the current transistor 2110 and the current resistor 2111 and coupled to the conversion control wafer 2112. The energy distribution module 22 is provided with a minimum voltage detector 220, an error amplifier 221, a comparator 222, a triangular wave generator 223, and a period switch 224. The lowest voltage detector 220 is coupled to the LED string. 3 and the positive input terminal of the error amplifier 221, and the negative input terminal of the error amplifier 221 receives a reference value (V ref ) and the output terminal is coupled to the negative input terminal of the comparator 222. The positive input end of the comparator 222 is coupled to the triangular wave generator 223 to receive a triangular wave, the output end of which is coupled to the periodic switch 224, and the two ends of the periodic switch 224 are electrically connected to the secondary side coil and the LEDs String 3. The dimming module 23 is provided with a receiver 230, a current source 231 and a controller 232. The controller 232 can be mainly composed of an operational amplifier 2320, a current mirror 2321 and a terminating resistor 2322. One end of the current mirror 2321 is coupled to the LED group 3 through a plurality of first regulators 2323 and the other end is coupled to the output terminal and the negative input terminal of the operational amplifier 2320 through a second regulator 2324, and the operational amplifier 2320 The positive input terminal is coupled to the terminating resistor 2322 and the current source 231, and the current source 231 is electrically connected to the receiver 230.
如此,該LED調光驅動電路2於步驟S1時,該橋式整流器整流該外部電源之交流電壓形成可變直流之一輸入電壓,且步驟S2:該輸入電壓經一儲能電容212充放電後供該一次側線圈儲能形成一一次側電流,又,透過電磁感應原理,該二次側線圈感應該一次側電流之變動而形成一輸出電壓。順帶一提的是,該轉換控制晶片2112透過該電流電阻2111即時檢測並藉該電流電晶體2110調節該一次側電流之流值大小,以控制該輸出電壓呈現穩定壓值狀態。 In this manner, when the LED dimming driving circuit 2 is in step S1, the bridge rectifier rectifies the alternating voltage of the external power source to form one variable DC input voltage, and step S2: the input voltage is charged and discharged through a storage capacitor 212. The primary side coil is stored to form a primary side current, and the secondary side coil senses the fluctuation of the primary side current to form an output voltage. Incidentally, the switching control chip 2112 immediately detects and adjusts the current value of the primary current through the current transistor 2110 to control the output voltage to exhibit a stable voltage state.
接著,步驟S3,該能量分配模組22轉輸出該輸出電壓予該等LED組串3而使各該LED組串3上流有一驅動電流,並且,步驟S4: 該最低電壓偵測器220偵測該等LED組串3之驅動電流而獲知一最低驅動電壓,以供該誤差放大器221判斷該最低驅動電壓與該基準值而獲取一誤差值,且該比較器222利用該三角波比較該誤差值後調節該週期開關224之導通週期而調節該輸出電壓之輸出總量,使確保該輸出電壓總量大於該等LED組串3順向偏壓,同時,穩定該等驅動電流為一恆定值。 Next, in step S3, the energy distribution module 22 rotates the output voltage to the LED string 3 to cause a driving current to flow on each of the LED strings 3, and step S4: The minimum voltage detector 220 detects the driving current of the LED string 3 to obtain a minimum driving voltage for the error amplifier 221 to determine the lowest driving voltage and the reference value to obtain an error value, and the comparator 222, using the triangular wave to compare the error value, adjusting the on-period of the periodic switch 224 to adjust the total output of the output voltage, so as to ensure that the total output voltage is greater than the forward bias of the LED string 3, and at the same time, stabilize the The driving current is a constant value.
同時,步驟S5,該接收器230判斷是否接收一調光訊號?若是,不論該接收器230透過無線或有線的方式接收一調光訊號時,步驟S50:該接收器230驅動該電流源231輸出對應該調光訊號之電流量,以供該控制器232利用該終端電阻2322轉換成一電壓準位,此時,步驟S51:該電流鏡2321利用該第二調節器2324獲取該驅動電流而獲知一亮度值後,進入步驟S6:該運算放大器2320比較該電壓準位與該亮度值而調節該第二調節器2324之作動狀態,進而透過該電流鏡2321調節該等第一調節器2323之導通與截止週期而影響該等驅動電流大小,實現線性調光效果。 At the same time, in step S5, the receiver 230 determines whether to receive a dimming signal. If the receiver 230 receives a dimming signal in a wireless or wired manner, step S50: the receiver 230 drives the current source 231 to output a current amount corresponding to the dimming signal for the controller 232 to utilize the The terminal resistor 2322 is converted into a voltage level. At this time, in step S51, the current mirror 2321 obtains the driving current by using the second regulator 2324 to obtain a brightness value, and then proceeds to step S6: the operational amplifier 2320 compares the voltage level. Adjusting the operation state of the second regulator 2324 with the brightness value, and adjusting the on and off periods of the first regulators 2323 through the current mirror 2321 to affect the magnitude of the driving currents, thereby realizing a linear dimming effect.
以上所述僅為舉例性之較佳實施例,而非為限制性者。任何未脫離本發明之精神與範疇,而對其進行之等效修改或變更,均應包含於後附之申請專利範圍中。 The above description is only illustrative of preferred embodiments and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
2‧‧‧LED調光驅動電路 2‧‧‧LED dimming drive circuit
20‧‧‧整流模組 20‧‧‧Rectifier Module
21‧‧‧轉換模組 21‧‧‧Transition module
210‧‧‧變壓器 210‧‧‧Transformer
22‧‧‧能量分配模組 22‧‧‧ energy distribution module
23‧‧‧調光模組 23‧‧‧ Dimming module
230‧‧‧接收器 230‧‧‧ Receiver
231‧‧‧電流源 231‧‧‧current source
232‧‧‧控制器 232‧‧‧ Controller
3‧‧‧LED組串 3‧‧‧LED string
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Cited By (2)
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TWI631875B (en) * | 2016-09-20 | 2018-08-01 | 日商松下知識產權經營股份有限公司 | Protection circuit of dimming device and dimming device |
TWI728610B (en) * | 2019-12-20 | 2021-05-21 | 友達光電股份有限公司 | Display device and method for controlling a light unit |
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Cited By (3)
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TWI631875B (en) * | 2016-09-20 | 2018-08-01 | 日商松下知識產權經營股份有限公司 | Protection circuit of dimming device and dimming device |
US10708989B2 (en) | 2016-09-20 | 2020-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Protection circuit for dimmer, and dimmer |
TWI728610B (en) * | 2019-12-20 | 2021-05-21 | 友達光電股份有限公司 | Display device and method for controlling a light unit |
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