TWI559813B - Led driver with adaptive reference voltage tracking control and method thereof - Google Patents
Led driver with adaptive reference voltage tracking control and method thereof Download PDFInfo
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Description
本發明是有關於一種發光二極體驅動裝置及方法，特別是指一種適應性參考電壓追蹤控制的發光二極體驅動裝置及方法。 The invention relates to a light-emitting diode driving device and method, in particular to a light-emitting diode driving device and method for adaptive reference voltage tracking control.
白光二極體已廣泛地應用於照明領域，其亮度與正向電壓(forward voltage)及驅動電流呈正比。但是，應用在多數發光二極體時，因為正向電壓隨著各發光二極體的元件差異而隨之不同，而驅動電流值和正向電壓值又呈指數比例的關係，直接使用正向電壓調節發光二極體將導致亮度不均的問題。 White light diodes have been widely used in the field of illumination, and their brightness is proportional to forward voltage and drive current. However, when applied to most light-emitting diodes, since the forward voltage varies with the components of each light-emitting diode, and the drive current value and the forward voltage value are exponentially proportional, the forward voltage is directly used. Adjusting the light-emitting diodes will cause problems with uneven brightness.
因此，確保發光二極體的亮度均勻較有效率的方式是採用恆定電流的驅動方案。另外，為了節能及生活所需，調光控制常用來管理發光二極體亮度。常見用於發光二極體驅動器的調光控制技術是類比式調光技術或波寬調變式調光技術。類比式調光技術較簡單但可能會造成色調變異(color variation)。為了克服此問題，一般是採用波 寬調變調光控制技術。而為了得到足夠亮度，通常是將許多發光二極體串聯及並聯。 Therefore, a more efficient way to ensure uniform brightness of the LED is to use a constant current drive scheme. In addition, in order to save energy and life needs, dimming control is commonly used to manage the brightness of the LED. The dimming control technology commonly used for LED drivers is analog dimming technology or wave width modulation dimming technology. Analog-type dimming techniques are simpler but can cause color variations. In order to overcome this problem, waves are generally used. Wide tone dimming control technology. In order to obtain sufficient brightness, many light-emitting diodes are usually connected in series and in parallel.
串聯式發光二極體燈串的優點是因為各發光二極體流經相同電流而可確保各發光二極體具有相同亮度。直流對直流轉換器用於供應足夠的驅動電壓給串聯式發光二極體燈串的全部正向電壓並保證電流調節器的運作。傳統方法是根據最大正向電壓配合一參考電壓(固定值)以兩者差異決定發光二極體燈串的驅動電壓。 The advantage of the series-type light-emitting diode string is that each of the light-emitting diodes has the same brightness because it flows through the same current. The DC-to-DC converter is used to supply sufficient drive voltage to the full forward voltage of the series LED string and to ensure operation of the current regulator. The conventional method is to determine the driving voltage of the light-emitting diode string according to the difference between the maximum forward voltage and a reference voltage (fixed value).
然而，發光二極體的正向電壓隨著環境溫度、使用時間及調光條件改變。例如，當環境溫度增加或當發光二極體亮度降低，發光二極體的正向電壓會隨之降低。另外，同步式的波寬調變技術因為週期性的突然改變，易造成輸入電流/輸出電流的抖動現象，造成電磁干擾現象，也會降低運作效率。 However, the forward voltage of the light-emitting diode changes with ambient temperature, time of use, and dimming conditions. For example, as the ambient temperature increases or as the luminance of the light-emitting diode decreases, the forward voltage of the light-emitting diode decreases. In addition, the synchronous wave width modulation technology is easy to cause the jitter of the input current/output current due to the sudden change of the periodicity, which causes electromagnetic interference and reduces the operational efficiency.
本發明之目的，即在提供一種改善先前技術的適應性參考電壓追蹤控制的發光二極體驅動裝置及方法。 It is an object of the present invention to provide a light emitting diode drive apparatus and method that improves prior art adaptive reference voltage tracking control.
本發明適應性參考電壓追蹤控制的發光二極體驅動裝置在一些實施態樣中電性連接一功率級電路、一發光模組及一波寬調變控制器，該功率級電路具有電性連接該發光模組的一輸出端，該發光模組具有多數串聯發光二極體元件的燈串及多數控制端，該波寬調變控制器接收該功率級電路的一回饋電壓及該適應性參考電壓並比較該回饋電壓及該適應性參考電壓之誤差而對應產生一用以控制 該功率級電路的波寬調變信號。 In some implementations, the LED device of the present invention is electrically connected to a power stage circuit, a light emitting module, and a wave width modulation controller. The power stage circuit has an electrical connection. An output end of the light-emitting module, the light-emitting module has a plurality of series-connected LED components and a plurality of control terminals, and the wave width modulation controller receives a feedback voltage of the power stage circuit and the adaptive reference Comparing the voltage and comparing the feedback voltage with the error of the adaptive reference voltage to generate a control The bandwidth modulation signal of the power stage circuit.
該發光二極體驅動裝置包括一選擇模組及一追蹤模組。該選擇模組依據連接所述燈串的控制端的多數調節信號產生一最低電壓調節信號；該追蹤模組電性連接該選擇模組以接收該最低電壓調節信號，並依據該最低電壓調節信號與一設定電壓以產生該適應性參考電壓。 The LED driving device comprises a selection module and a tracking module. The selection module generates a minimum voltage adjustment signal according to a plurality of adjustment signals connected to the control end of the light string; the tracking module is electrically connected to the selection module to receive the minimum voltage adjustment signal, and adjusts the signal according to the minimum voltage A set voltage is applied to generate the adaptive reference voltage.
在一些實施態樣中，該發光二極體驅動裝置還包括一循序控制器及一電流調節模組。該循序控制器依據一調光信號及一預定規則產生多數非同步的脈衝序列信號，該預定規則是各該脈衝序列信號的相位間隔皆為360°/n，n為該等燈串的數量；該電流調節模組具有多數電流調節單元，電性連接該循序控制器及所述控制端，依據所述脈衝序列信號以產生所述燈串的導通電流。 In some implementations, the LED driving device further includes a sequential controller and a current regulating module. The sequence controller generates a plurality of non-synchronized pulse sequence signals according to a dimming signal and a predetermined rule. The predetermined rule is that each of the pulse sequence signals has a phase interval of 360°/n, where n is the number of the strings; The current regulation module has a plurality of current adjustment units electrically connected to the sequence controller and the control terminal to generate an on current of the string according to the pulse sequence signal.
在一些實施態樣中，該追蹤模組具有一誤差放大器及一減法器，該誤差放大器接收該最低電壓調節信號及該設定電壓以產生一追蹤信號，該減法器接收該追蹤信號及一預定電壓，且藉由該預定電壓與該追蹤信號相減而產生該適應性參考電壓。 In some implementations, the tracking module has an error amplifier and a subtractor, the error amplifier receives the lowest voltage adjustment signal and the set voltage to generate a tracking signal, and the subtractor receives the tracking signal and a predetermined voltage. And the adaptive reference voltage is generated by subtracting the predetermined voltage from the tracking signal.
在一些實施態樣中，該選擇模組具有多個傳輸閘、多個儲能單元、多個多工器及多數比較器，當該調光信號為高準位，所述傳輸閘受該調光信號控制而開啟，所述控制端的調節信號供所述儲能單元對應充電，並通過所述多工器及所述比較器輸出該最低電壓調節信號；當該調光信號為低準位，所述傳輸閘受該調光信號控制而關閉， 所述儲能單元保持輸出該最低電壓調節信號。 In some implementations, the selection module has a plurality of transmission gates, a plurality of energy storage units, a plurality of multiplexers, and a plurality of comparators. When the dimming signal is at a high level, the transmission gate is subjected to the adjustment. The light signal is controlled to be turned on, and the adjustment signal of the control end is correspondingly charged by the energy storage unit, and the minimum voltage adjustment signal is output through the multiplexer and the comparator; when the dimming signal is at a low level, The transmission gate is controlled to be turned off by the dimming signal. The energy storage unit keeps outputting the lowest voltage adjustment signal.
本發明適應性參考電壓追蹤控制的發光二極體驅動方法在一些實施態樣中包括下述步驟：該選擇模組依據連接所述燈串的控制端的多數調節信號產生一最低電壓調節信號；該追蹤模組接收該最低電壓調節信號，並依據該最低電壓調節信號與一設定電壓以產生該適應性參考電壓；及該波寬調變控制器接收該功率級電路的一回饋電壓及該適應性參考電壓並比較該回饋電壓及該適應性參考電壓之誤差而對應產生一用以控制該功率級電路的波寬調變信號。 The light-emitting diode driving method of the adaptive reference voltage tracking control of the present invention includes the following steps in some embodiments: the selection module generates a minimum voltage adjustment signal according to a majority of the adjustment signals connected to the control end of the light string; The tracking module receives the minimum voltage adjustment signal, and according to the minimum voltage adjustment signal and a set voltage to generate the adaptive reference voltage; and the bandwidth modulation controller receives a feedback voltage of the power stage circuit and the adaptability The reference voltage is compared with the error of the feedback voltage and the adaptive reference voltage to generate a bandwidth modulation signal for controlling the power stage circuit.
本發明之功效在於：發光二極體驅動裝置依據連接所述燈串的控制端的多數調節信號輸出最低電壓調節信號，並依據最低電壓調節信號與調光信號運算後產生適應性參考電壓，經由發光裝置的回饋電壓與適應性參考電壓(非固定值)之誤差而對應產生用以控制該功率級電路的波寬調變信號，可改善現有發光二極體的正向電壓不穩定的問題。 The effect of the invention is that the LED driving device outputs a minimum voltage adjustment signal according to a majority of the adjustment signals connected to the control end of the lamp string, and generates an adaptive reference voltage according to the lowest voltage adjustment signal and the dimming signal, and generates an adaptive reference voltage. The error of the feedback voltage of the device and the adaptive reference voltage (non-fixed value) correspondingly generate a wave width modulation signal for controlling the power stage circuit, which can improve the problem of the forward voltage instability of the existing light-emitting diode.
此外，循序控制器依據該調光信號及一預定規則產生多數非同步的脈衝序列信號，該預定規則是各該脈衝序列信號的相位間隔皆為360°/n，n為該等燈串的數量，且多數電流調節單元依據所述脈衝序列信號以產生所述燈串的導通電流，可降低輸入電流/輸出電流的抖動現象，減少輸出電壓暫態漣波大小，及提升運作效率。 In addition, the sequence controller generates a plurality of non-synchronized pulse sequence signals according to the dimming signal and a predetermined rule, wherein the predetermined rule is that each of the pulse sequence signals has a phase interval of 360°/n, and n is the number of the strings. And the majority current adjustment unit generates the on-current of the light string according to the pulse sequence signal, thereby reducing the jitter of the input current/output current, reducing the output voltage transient chopping size, and improving the operation efficiency.
1‧‧‧發光二極體驅動裝置 1‧‧‧Lighting diode drive
11‧‧‧循序控制器 11‧‧‧Sequence controller
12‧‧‧電流調節模組 12‧‧‧ Current Regulation Module
121~123‧‧‧電流調節單元 121~123‧‧‧current adjustment unit
13‧‧‧選擇模組 13‧‧‧Selection module
131‧‧‧傳輸閘 131‧‧‧Transmission gate
132‧‧‧儲能單元 132‧‧‧ Energy storage unit
133‧‧‧多工器 133‧‧‧Multiplexer
134‧‧‧比較器 134‧‧‧ comparator
14‧‧‧追蹤模組 14‧‧‧Tracking module
141‧‧‧誤差放大器 141‧‧‧Error amplifier
142‧‧‧減法器 142‧‧‧Subtractor
3‧‧‧發光裝置 3‧‧‧Lighting device
30‧‧‧燈串 30‧‧‧light string
301‧‧‧輸出端 301‧‧‧output
302‧‧‧控制端 302‧‧‧Control terminal
31‧‧‧功率級電路 31‧‧‧Power level circuit
32‧‧‧發光模組 32‧‧‧Lighting module
33‧‧‧波寬調變控制器 33‧‧‧wave width modulation controller
Iled1、Iled2、Iled3‧‧‧導通電流 I led1 , I led2 , I led3 ‧‧‧ conduction current
Io‧‧‧輸出電流 Io‧‧‧ output current
PWM1~PWM3‧‧‧脈衝序列信號 PWM 1 ~PWM 3 ‧‧‧ pulse sequence signal
、、‧‧‧調節信號 , , ‧‧‧Adjustment signal
Vcr,min‧‧‧最低電壓調節信號 V cr,min ‧‧‧minimum voltage regulation signal
Vcr,set‧‧‧設定電壓 V cr,set ‧‧‧Set voltage
Vdim‧‧‧調光信號 V dim ‧‧‧ dimming signal
Vfb‧‧‧回饋電壓 V fb ‧‧‧ feedback voltage
Vtrack‧‧‧追蹤信號 V track ‧‧‧Tracking signal
VPWM‧‧‧波寬調變信號 V PWM ‧‧‧wave width modulation signal
Vref,track‧‧‧適應性參考電壓 V ref,track ‧‧‧adaptive reference voltage
Vref‧‧‧預定電壓 V ref ‧‧‧predetermined voltage
Vo‧‧‧輸出電壓 Vo‧‧‧ output voltage
本發明之其他的特徵及功效，將於參照圖式的實施例詳細說明中清楚地呈現，其中：圖1是一系統方塊圖，說明本發明適應性參考電壓追蹤控制的發光二極體驅動裝置的實施例應用於電性連接一發光裝置；圖2是一電路方塊圖，說明本實施例應用的循序控制器、電流調節模組及發光模組；圖3是一電路方塊圖，說明本實施例應用的選擇模組；圖4是一電路方塊圖，說明本實施例應用的追蹤模組及波寬調變控制器；圖5是一波形圖，說明本實施例的追蹤信號Vtrack、適應性參考電壓Vref,track及輸出電壓Vo；圖6是一波形圖，說明本實施例應用三組脈衝序列信號PWM1~PWM3的責任週期皆小於1/3，其對應的輸出電流Io及輸出電壓Vo；圖7是一波形圖，說明本實施例應用三組脈衝序列信號PWM1~PWM3的責任週期皆大於1/3，其對應的輸出電流Io及輸出電壓Vo。 Other features and advantages of the present invention will be apparent from the detailed description of the embodiments of the present invention. FIG. 1 is a system block diagram illustrating the illuminating diode driving device of the adaptive reference voltage tracking control of the present invention. The embodiment is applied to electrically connect an illuminating device; FIG. 2 is a circuit block diagram illustrating the sequential controller, the current regulating module and the illuminating module applied in the embodiment; FIG. 3 is a circuit block diagram illustrating the implementation FIG. 4 is a circuit block diagram illustrating the tracking module and the wave width modulation controller applied in the embodiment; FIG. 5 is a waveform diagram illustrating the tracking signal V track of the embodiment. The reference voltage V ref, track and the output voltage Vo; FIG. 6 is a waveform diagram illustrating that the duty cycle of the three sets of pulse sequence signals PWM 1 ~ PWM 3 is less than 1/3, and the corresponding output current Io and The output voltage Vo; FIG. 7 is a waveform diagram illustrating that the duty cycle of the three sets of pulse sequence signals PWM 1 to PWM 3 applied in this embodiment is greater than 1/3, and the corresponding output current Io and output voltage Vo.
參閱圖1，本發明的發光二極體驅動裝置1的實施例應用於電性連接一發光裝置3。 Referring to FIG. 1, an embodiment of a light-emitting diode driving device 1 of the present invention is applied to electrically connect a light-emitting device 3.
發光裝置3包括一功率級電路31、多數發光模組32及一波寬調變控制器33。各元件作用原理說明如下。 The light-emitting device 3 includes a power stage circuit 31, a plurality of light-emitting modules 32, and a wave width modulation controller 33. The principle of operation of each component is explained below.
功率級電路31具有一輸出端301，輸出端301 載有一輸出電壓Vo及一輸出電流Io。發光模組32電性連接功率級電路31的輸出端301，並具有多數串聯發光二極體元件的燈串30及多數控制端302。 The power stage circuit 31 has an output 301 and an output 301. An output voltage Vo and an output current Io are carried. The light-emitting module 32 is electrically connected to the output end 301 of the power stage circuit 31, and has a light string 30 of a plurality of series-connected LED elements and a plurality of control terminals 302.
波寬調變控制器33接收功率級電路31的一回饋電壓Vfb及一適應性參考電壓Vref,track並比較回饋電壓Vfb及適應性參考電壓Vref,track之誤差而對應產生一用以控制功率級電路31的波寬調變信號VPWM。 The wave width modulation controller 33 receives a feedback voltage V fb of the power stage circuit 31 and an adaptive reference voltage V ref,track and compares the feedback voltage V fb with the adaptive reference voltage V ref , track error to generate a corresponding To control the bandwidth modulation signal V PWM of the power stage circuit 31.
發光二極體驅動裝置1包括一循序控制器11、一電流調節模組12、一選擇模組13及一追蹤模組14。 The LED driving device 1 includes a sequential controller 11, a current regulating module 12, a selection module 13, and a tracking module 14.
選擇模組13依據連接所述發光模組32的控制端302的多數調節信號、、產生一最低電壓調節信號Vcr,min。 The selection module 13 is based on a plurality of adjustment signals connected to the control end 302 of the illumination module 32. , , A minimum voltage adjustment signal Vcr,min is generated.
本發明以適應性參考電壓Vref,track控制的發光二極體驅動方法的控制原理配合圖1詳細說明如下。 The control principle of the LED driving method controlled by the adaptive reference voltage V ref,track is described in detail in conjunction with FIG. 1 as follows.
參閱圖2，循序控制器11依據調光信號Vdim及一預定規則產生多數非同步的脈衝序列信號PWM1~PWM3，且該預定規則是脈衝序列信號PWM1~PWM3的相位間隔皆為360°/n，其中的n為該等燈串30的數量。本實施例中，脈衝序列信號PWM1~PWM3的相位間隔為120°，電流調節模組12具有三組電流調節單元121~123，各電流調節單元121~123於本實施例中是(但不限於)包括一電流鏡(current mirror)電路，電性連接循序控制器11及所述控制端302，依據所述脈衝序列信號PWM1~PWM3以產生所述控制端302的導通電流Iled1、Iled2、Iled3。 Referring to FIG. 2, the sequence controller 11 generates a plurality of non-synchronized pulse sequence signals PWM 1 to PWM 3 according to the dimming signal V dim and a predetermined rule, and the predetermined rule is that the phase intervals of the pulse sequence signals PWM 1 to PWM 3 are 360°/n, where n is the number of the strings 30. In this embodiment, the phase sequence of the pulse sequence signals PWM 1 to PWM 3 is 120°, and the current adjustment module 12 has three sets of current adjustment units 121 to 123. The current adjustment units 121 to 123 are in this embodiment (but The current mirror circuit is electrically connected to the sequence controller 11 and the control terminal 302 according to the pulse sequence signals PWM 1 to PWM 3 to generate the conduction current I led1 of the control terminal 302. , I led2 , I led3 .
參閱圖3，選擇模組13依據連接所述發光模組32的控制端302的多數調節信號、、產生一最低電壓調節信號Vcr,min。 Referring to FIG. 3, the selection module 13 is based on a plurality of adjustment signals connected to the control terminal 302 of the illumination module 32. , , Generating a lowest voltage regulating signal V cr, min.
本實施例中，選擇模組13具有多個傳輸閘131、多個儲能單元132、多個多工器133及多數比較器134。當調光信號Vdim為高準位時，所述傳輸閘131受調光信號Vdim控制而開啟，所述控制端302的調節信號、、供所述儲能單元132對應充電，並通過所述多工器133及所述比較器134輸出調節信號、、三者中的最低電壓調節信號Vcr,min。當調光信號Vdim為低準位時，所述傳輸閘131受調光信號Vdim控制而關閉，所述儲能單元132保持輸出最低電壓調節信號Vcr,min，因此輸出電壓Vo不會受到調光信號Vdim改變時而有所影響。 In this embodiment, the selection module 13 has a plurality of transmission gates 131, a plurality of energy storage units 132, a plurality of multiplexers 133, and a plurality of comparators 134. When the dimming signal V dim is at a high level, the transmission gate 131 is controlled to be turned on by the dimming signal V dim , and the adjustment signal of the control terminal 302 is , , The energy storage unit 132 is correspondingly charged, and the adjustment signal is output through the multiplexer 133 and the comparator 134. , , The lowest voltage regulation signal V cr,min in the three . When the dimming signal V dim is at a low level, the transmission gate 131 is controlled to be turned off by the dimming signal V dim , and the energy storage unit 132 keeps outputting the lowest voltage adjustment signal V cr,min , so the output voltage Vo does not It is affected by the change of the dimming signal V dim .
參閱圖4，追蹤模組14電性連接選擇模組13以接收最低電壓調節信號Vcr,min，本實施例中，追蹤模組14具有一誤差放大器141及一減法器142，誤差放大器141的負輸入端(-)並聯連接電阻R1及R2，正輸入端(+)並聯連接電阻R3及R4，電阻R1及電阻R3的阻值相同，電阻R2及電阻R4的阻值相同，且正輸入端(+)接收最低電壓調節信號Vcr,min及負輸入端(-)接收一設定電壓Vcr,set以產生一追蹤信號Vtrack，減法器142接收追蹤信號Vtrack及一預定電壓Vref，且藉由預定電壓Vref與追蹤信號Vtrack相減而產生適應性參考電壓Vref,track。 Referring to FIG. 4, the tracking module 14 is electrically connected to the selection module 13 to receive the lowest voltage adjustment signal V cr,min . In this embodiment, the tracking module 14 has an error amplifier 141 and a subtractor 142, and the error amplifier 141 The negative input terminal (-) is connected in parallel with the resistors R 1 and R 2 , the positive input terminal (+) is connected in parallel with the resistors R 3 and R 4 , and the resistances of the resistor R 1 and the resistor R 3 are the same, and the resistor R 2 and the resistor R 4 are The resistance values are the same, and the positive input terminal (+) receives the lowest voltage adjustment signal V cr,min and the negative input terminal (-) receives a set voltage V cr,set to generate a tracking signal V track , and the subtractor 142 receives the tracking signal V The track and a predetermined voltage V ref are generated by subtracting the predetermined voltage V ref from the tracking signal V track to generate an adaptive reference voltage V ref,track .
本實施例中，設定電壓Vcr,set是各電流調節單 元121~123具有的調光電晶體的最小汲源電壓(drain-source Voltage)。預定電壓Vref用於設定輸出電壓Vo。適應性參考電壓Vref,track包含最低電壓調節信號Vcr,min及設定電壓Vcr,set的誤差值，所以可自動調整輸出電壓Vo。 In this embodiment, the set voltage V cr,set is the minimum drain-source voltage of the dimming crystals of the current adjusting units 121-123. The predetermined voltage V ref is used to set the output voltage Vo. The adaptive reference voltage V ref, track contains the minimum voltage adjustment signal V cr,min and the error value of the set voltage V cr,set , so the output voltage Vo can be automatically adjusted.
參閱圖2及圖4，各電流調節單元121~123還接收脈衝序列信號PWM1~PWM3及追蹤信號Vtrack，並以一邏輯電路(含二個反相器及一「或」閘)依據脈衝序列信號PWM1~PWM3或追蹤信號Vtrack配合電流鏡電路導通該等燈串30。藉此，可改善輸出電壓Vo降低時的暫態反應。 Referring to FIG. 2 and FIG. 4, each of the current regulating units 121-123 also receives the pulse sequence signals PWM 1 to PWM 3 and the tracking signal V track , and is based on a logic circuit (including two inverters and an OR gate). The pulse train signals PWM 1 ~ PWM 3 or the tracking signal V track are coupled to the light string 30 in conjunction with the current mirror circuit. Thereby, the transient reaction when the output voltage Vo is lowered can be improved.
參閱圖5，並配合圖4，當最低電壓調節信號Vcr,min大於設定電壓Vcr,set，追蹤信號Vtrack增加，當預定電壓Vref為固定值並與追蹤信號Vtrack相減使得適應性參考電壓Vref,track和輸出電壓Vo均為降低，則最低電壓調節信號Vcr,min也隨之降低；最後，最低電壓調節信號Vcr,min等於設定電壓Vcr,set，此時，輸出電壓Vo低於先前值。同樣的，當最低電壓調節信號Vcr,min小於設定電壓Vcr,set，輸出電壓Vo將增加，最後亦使Vcr,min等於Vcr,set。若追蹤信號Vtrack的最小值接近零，輸出電壓Vo之值會保持在預定電壓Vref。 Referring to FIG. 5, and in conjunction with FIG. 4, when the minimum voltage adjustment signal Vcr,min is greater than the set voltage Vcr,set , the tracking signal Vtrack is increased, and when the predetermined voltage Vref is a fixed value and subtracted from the tracking signal Vtrack , the adaptation is made. When the reference voltage V ref, track and the output voltage Vo are both lowered, the minimum voltage adjustment signal V cr,min is also reduced; finally, the lowest voltage adjustment signal V cr,min is equal to the set voltage V cr,set , at this time, The output voltage Vo is lower than the previous value. Similarly, when the minimum voltage adjustment signal V cr,min is less than the set voltage V cr,set , the output voltage Vo will increase, and finally V cr,min is equal to V cr,set . If the minimum value of the tracking signal V track is close to zero, the value of the output voltage Vo will remain at the predetermined voltage V ref .
參閱圖6及圖7，圖6是三組脈衝序列信號PWM1~PWM3的責任週期皆小於1/3，故高準位波形均為不同時出現。圖7是三組脈衝序列信號PWM1~PWM3，各脈衝序列信號PWM1~PWM3的責任週期皆大於1/3，故至少兩者 有部分的高準位波形同時出現，根據如圖4的最低電壓調節信號Vcr,min的選擇產生追蹤信號Vtrack，當如圖2的脈衝序列信號PWM1導通時，藉由追蹤信號Vtrack之控制，使輸出電壓Vo為最大值的電壓Vled1，脈衝序列信號PWM1不導通時，輸出電壓Vo即為次大值的電壓Vled2。經比較後可發現，圖6與圖7可降低輸入電流/輸出電流的抖動現象，減少輸出電壓暫態漣波大小，及提升運作效率。 Referring to FIG. 6 and FIG. 7, FIG. 6 is that the duty cycle of the three sets of pulse sequence signals PWM 1 ~ PWM 3 are less than 1/3, so the high level waveforms are different. Figure 7 is three sets of pulse sequence signals PWM 1 ~ PWM 3 , the duty cycle of each pulse sequence signal PWM 1 ~ PWM 3 is greater than 1/3, so at least some of the high level waveforms appear at the same time, according to Figure 4 when the minimum voltage regulating signal V cr, min selection generate tracking signals V track, the pulse train signal PWM 1 when turned on in FIG. 2, V track by the tracking control signal, the output voltage Vo is the maximum voltage V led1 When the pulse sequence signal PWM 1 is not turned on, the output voltage Vo is the voltage Vled2 of the next largest value. After comparison, it can be found that FIG. 6 and FIG. 7 can reduce the jitter of the input current/output current, reduce the magnitude of the output voltage transient chopping, and improve the operating efficiency.
綜上所述，本發明之功效包括： In summary, the effects of the present invention include:
一、發光二極體驅動裝置1依據連接所述發光模組32的控制端302的多數調節信號、、輸出最低電壓調節信號Vcr,min，追蹤模組14並依據最低電壓調節信號Vcr,min、設定電壓Vcr,set及預定電壓Vref運算後產生適應性參考電壓Vref,track，經由發光裝置3的回饋電壓Vfb與適應性參考電壓Vref,track(非固定值)之誤差而對應產生用以控制功率級電路31的波寬調變信號VPWM，可動態調整輸出電壓以提升效率。 1. The LED driving device 1 is based on a plurality of adjustment signals connected to the control terminal 302 of the lighting module 32. , , The minimum voltage adjustment signal V cr,min is output , and the tracking module 14 generates an adaptive reference voltage V ref,track according to the lowest voltage adjustment signal V cr,min , the set voltage V cr,set and the predetermined voltage V ref , Corresponding to the error of the adaptive reference voltage V ref,track (non-fixed value), the feedback voltage V fb of the device 3 generates a bandwidth modulation signal V PWM for controlling the power stage circuit 31, and the output voltage can be dynamically adjusted to improve efficiency. .
二、循序控制器11依據調光信號Vdim及預定規則產生多數非同步的脈衝序列信號PWM1~PWM3，且多數電流調節單元121、122、123依據所述脈衝序列信號PWM1~PWM3以產生所述控制端302的導通電流，可降低輸入電流/輸出電流Io的抖動現象，減少輸出電壓暫態漣波大小，及提升運作效率，故確實能達成本發明之目的。 2. The sequence controller 11 generates a plurality of non-synchronized pulse sequence signals PWM 1 to PWM 3 according to the dimming signal V dim and a predetermined rule, and the plurality of current adjusting units 121 , 122 , 123 are based on the pulse sequence signals PWM 1 to PWM 3 . In order to generate the on-current of the control terminal 302, the jitter of the input current/output current Io can be reduced, the output voltage transient chopping size can be reduced, and the operational efficiency can be improved, so that the object of the present invention can be achieved.
惟以上所述者，僅為本發明之實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專 利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。 However, the above is only an embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the application according to the present invention is The simple equivalent changes and modifications made by the scope of the patent and the contents of the patent specification are still within the scope of the invention.
1‧‧‧發光二極體驅動裝置 1‧‧‧Lighting diode drive
11‧‧‧循序控制器 11‧‧‧Sequence controller
12‧‧‧電流調節模組 12‧‧‧ Current Regulation Module
13‧‧‧選擇模組 13‧‧‧Selection module
14‧‧‧追蹤模組 14‧‧‧Tracking module
3‧‧‧發光裝置 3‧‧‧Lighting device
30‧‧‧燈串 30‧‧‧light string
301‧‧‧輸出端 301‧‧‧output
302‧‧‧控制端 302‧‧‧Control terminal
31‧‧‧功率級電路 31‧‧‧Power level circuit
32‧‧‧發光模組 32‧‧‧Lighting module
33‧‧‧波寬調變控制器 33‧‧‧wave width modulation controller
Iled1、Iled2、Iled3‧‧‧導通電流 I led1 , I led2 , I led3 ‧‧‧ conduction current
Io‧‧‧輸出電流 Io‧‧‧ output current
PWM1~PWM3‧‧‧脈衝序列信號 PWM 1 ~PWM 3 ‧‧‧ pulse sequence signal
Vcr1、Vcr2、Vcr3‧‧‧調節信號 V cr1, V cr2, V cr3 ‧‧‧ adjustment signal
Vcr,min‧‧‧最低電壓調節信號 V cr,min ‧‧‧minimum voltage regulation signal
Vcr,set‧‧‧設定電壓 V cr,set ‧‧‧Set voltage
Vdim‧‧‧調光信號 V dim ‧‧‧ dimming signal
Vfb‧‧‧回饋電壓 V fb ‧‧‧ feedback voltage
Vref,track‧‧‧適應性參考電壓 V ref,track ‧‧‧adaptive reference voltage
Vref‧‧‧預定電壓 V ref ‧‧‧predetermined voltage
VPWM‧‧‧波寬調變信號 V PWM ‧‧‧wave width modulation signal
Vo‧‧‧輸出電壓 Vo‧‧‧ output voltage
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102448226A (en) * | 2010-10-01 | 2012-05-09 | 英特赛尔美国股份有限公司 | LED driver with adaptive dynamic headroom voltage control |
| TW201309085A (en) * | 2011-08-12 | 2013-02-16 | Raydium Semiconductor Corp | LED driver |
| JP2013143468A (en) * | 2012-01-11 | 2013-07-22 | Sanken Electric Co Ltd | Optical element driving device |
| US8536806B2 (en) * | 2010-11-26 | 2013-09-17 | Renesas Electronics Corporation | Semiconductor integrated circuit and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102448226A (en) * | 2010-10-01 | 2012-05-09 | 英特赛尔美国股份有限公司 | LED driver with adaptive dynamic headroom voltage control |
| US8536806B2 (en) * | 2010-11-26 | 2013-09-17 | Renesas Electronics Corporation | Semiconductor integrated circuit and operation method thereof |
| TW201309085A (en) * | 2011-08-12 | 2013-02-16 | Raydium Semiconductor Corp | LED driver |
| JP2013143468A (en) * | 2012-01-11 | 2013-07-22 | Sanken Electric Co Ltd | Optical element driving device |
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