TW201442555A - Light emitting diode driving system - Google Patents
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- TW201442555A TW201442555A TW102114924A TW102114924A TW201442555A TW 201442555 A TW201442555 A TW 201442555A TW 102114924 A TW102114924 A TW 102114924A TW 102114924 A TW102114924 A TW 102114924A TW 201442555 A TW201442555 A TW 201442555A
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
Description
本發明涉及發光二極體驅動系統，尤其涉及一種可以控制發光二極體電流的驅動系統。The present invention relates to a light emitting diode driving system, and more particularly to a driving system capable of controlling a current of a light emitting diode.
傳統發光二極體電流的控制，每一個發光二極體串都需要金氧半場效電晶體(Metal-Oxide-Semiconductor Field-Effect Transistor, 簡稱MOSFET)，這樣造成發光二極體驅動系統體積大達不到小型化的的需求。當發光二極體串數增加時，MOSFET的數量也會增加造成成本上升，且對於發光二極體電流的控制需要專用積體電路(Integrated Circuit, 簡稱IC)作控制，也會造成成本的上升。The control of the conventional LED current requires a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) for each LED string, which results in a large volume of the LED driving system. Not the need for miniaturization. When the number of LEDs increases, the number of MOSFETs increases, which causes an increase in cost, and the control of the LED current requires a dedicated integrated circuit (IC) for control, which also causes an increase in cost. .
本發明提供一種發光二極體驅動系統，可實現小型化的目的且可降低成本。The invention provides a light-emitting diode driving system, which can achieve the purpose of miniaturization and can reduce the cost.
本發明實施方式提供一種發光二極體驅動系統，用於驅動多個發光二極體串，包括電壓變壓電路、控制電路、電流平衡電路、回饋保護電路及調光電路。電壓變壓電路電連接於外部電源，用於將從外部電源獲得電壓轉換成交流電壓且對完成交流電壓的升降壓轉換。控制電路電連接於電壓變壓電路，用於控制電壓變壓電路。電流平衡電路連接於電壓變壓電路與多個發光二極體串陽極之間，用於平衡驅動多個發光二極體串中的各發光二極體串的電流。回饋保護電路電連接於多個發光二極體串陰極，用於依據發光二極體串陰極最大電壓作為回饋信號，回饋至控制電路，且依據多個發光二極體串陰極的最小電壓與參考電壓比較後，產生保護信號後並發送至控制電路，以控制電壓變壓電路的電壓。調光電路電連接於控制電路與回饋保護電路之間，用於調節多個發光二極體串的燈光亮度。Embodiments of the present invention provide a light emitting diode driving system for driving a plurality of light emitting diode strings, including a voltage transformer circuit, a control circuit, a current balancing circuit, a feedback protection circuit, and a dimming circuit. The voltage transformer circuit is electrically connected to an external power source for converting a voltage obtained from an external power source into an AC voltage and converting the buck-boost voltage to the completed AC voltage. The control circuit is electrically connected to the voltage transformer circuit for controlling the voltage transformer circuit. The current balancing circuit is connected between the voltage transformer circuit and the plurality of LED strings and is used for balancing the currents of the LED strings in the plurality of LED strings. The feedback protection circuit is electrically connected to the plurality of LED series cathodes for feeding back to the control circuit according to the maximum voltage of the LEDs of the LEDs, and according to the minimum voltage and reference of the cathodes of the plurality of LEDs After the voltage is compared, a protection signal is generated and sent to the control circuit to control the voltage of the voltage transformer circuit. The dimming circuit is electrically connected between the control circuit and the feedback protection circuit for adjusting the brightness of the plurality of LED strings.
優選的，電壓變壓電路包括電壓轉換單元及變壓器。變壓器包括輸入端及輸出端。電壓轉換單元電連接於控制電路相連，用於將直流電壓轉換成交流電壓。變壓器的輸入端與電壓轉換單元相連，變壓器的輸出端與電流平衡電路相連。Preferably, the voltage transformer circuit comprises a voltage conversion unit and a transformer. The transformer includes an input end and an output end. The voltage conversion unit is electrically connected to the control circuit for converting the DC voltage into an AC voltage. The input of the transformer is connected to the voltage conversion unit, and the output of the transformer is connected to the current balancing circuit.
優選的，控制電路包括脈寬調變控制器，脈寬調變控制器輸出不同週期的脈波以控制電壓變壓電路。Preferably, the control circuit comprises a pulse width modulation controller, and the pulse width modulation controller outputs pulse waves of different periods to control the voltage transformation circuit.
優選的，電流平衡電路包括多個二極體、多個電容及多個電流平衡變壓器。多個二極體其中第一個二極體串聯於變壓器的輸出端與多個發光二極體串的其中第一個發光二極體串的陽極之間。多個電容其中第一個電容的一端連接於多個發光二極體串的其中第四個發光二極體串的陽極，另一端接地。多個電流平衡變壓器的數目比多個發光二極體串數目少1，電流平衡變壓器包括匝數相同的初級繞組與次級繞組，多個電流平衡變壓器的其中第一電流平衡變壓器的初級繞組串聯於多個二極體的其中第一二極體的陰極與多個發光二極體串的其中第一發光二極體串之間，第一電流平衡變壓器的次級繞組串聯於多個電流平衡變壓器的其中第二電流平衡變壓器的初級繞組與多個發光二極體串的其中第二發光二極體串之間。第二電流平衡變壓器的初級繞組與多個二極體的其中第二二極體的陰極串聯，第二電流平衡變壓器的次級繞組串聯於多個二極體的其中第三二極體的陰極與多個發光二極體串的其中第三發光二極體串之間且與多個電流平衡變壓器的其中的第三電流平衡變壓器的初級繞組串聯。第三電流平衡變壓器的次級繞組串聯於多個二極體的其中第四二極體的陰極與多個發光二極體串的其中第四發光二極體串之間。Preferably, the current balancing circuit comprises a plurality of diodes, a plurality of capacitors and a plurality of current balancing transformers. The first diode of the plurality of diodes is connected in series between the output of the transformer and the anode of the first of the plurality of LED strings. One of the plurality of capacitors has one end connected to the anode of the fourth of the plurality of LED strings and the other end of which is grounded. The number of the plurality of current balancing transformers is less than the number of the plurality of LED strings, and the current balancing transformer includes the primary winding and the secondary winding having the same number of turns, and the primary windings of the first current balancing transformer of the plurality of current balancing transformers are connected in series Between the cathode of the first diode of the plurality of diodes and the first LED string of the plurality of LED strings, the secondary winding of the first current balancing transformer is connected in series with the plurality of current balances A primary winding of the transformer in which the second current balancing transformer is connected to the second light emitting diode string of the plurality of light emitting diode strings. The primary winding of the second current balancing transformer is connected in series with the cathode of the second diode of the plurality of diodes, and the secondary winding of the second current balancing transformer is connected in series with the cathode of the third diode of the plurality of diodes The first winding of the third current balancing transformer of the plurality of current balancing transformers is connected in series with the plurality of light emitting diode strings. The secondary winding of the third current balancing transformer is connected in series between the cathode of the fourth diode of the plurality of diodes and the fourth LED string of the plurality of LED strings.
優選的，回饋保護電路包括電壓回饋單元及電壓保護單元。電壓回饋單元包括第一電阻、第二電阻、第三電阻、第四電阻及多組由兩個二極體組成的二極體組。第一電阻電連接於外部電源。第二電阻一端電連接於第一電阻，一端電連接於多組二極體的陽極。多個發光二極體串的其中第一個發光二極體串的陰極電連接於多組二極體組的其中第一組二極體組之間，第三電阻電連接於多組二極體組的陰極，第四電阻一端電連接於第三電阻，一端接地。電壓保護單元包括第五電阻及比較器。第五電阻一端電連接於第一電阻與第二電阻之間，一端接地。比較器包括第一輸入端、第二輸入端及輸出端，比較器的第一輸入端電連接於第五電阻，比較器的第二輸入端為電壓參考端，比較器的輸出端電連接於控制電路。其中，電壓保護單元取得的電壓大於比較器的參考電壓時，比較器的輸出端輸出低電平信號給控制電路，使得控制電路停止工作。當電壓保護單元取得的電壓小於比較器的參考電壓時，比較器的輸出端輸出高電平給控制電路，使得控制電路正常工作。Preferably, the feedback protection circuit comprises a voltage feedback unit and a voltage protection unit. The voltage feedback unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a plurality of sets of diodes composed of two diodes. The first resistor is electrically connected to an external power source. One end of the second resistor is electrically connected to the first resistor, and one end is electrically connected to the anodes of the plurality of sets of diodes. a cathode of the first LED string of the plurality of LED strings is electrically connected between the first group of diodes of the plurality of diode groups, and the third resistor is electrically connected to the plurality of diodes The cathode of the body group, one end of the fourth resistor is electrically connected to the third resistor, and one end is grounded. The voltage protection unit includes a fifth resistor and a comparator. One end of the fifth resistor is electrically connected between the first resistor and the second resistor, and one end is grounded. The comparator comprises a first input end, a second input end and an output end, the first input end of the comparator is electrically connected to the fifth resistor, the second input end of the comparator is a voltage reference end, and the output end of the comparator is electrically connected Control circuit. Wherein, when the voltage obtained by the voltage protection unit is greater than the reference voltage of the comparator, the output end of the comparator outputs a low level signal to the control circuit, so that the control circuit stops working. When the voltage obtained by the voltage protection unit is less than the reference voltage of the comparator, the output of the comparator outputs a high level to the control circuit, so that the control circuit works normally.
優選的，調光電路包括第一開關，第一開關的第一電極電連接於發光二極體串的陰極，第一開關的第二電極接地，第一開關的控制極點連接與控制電路。Preferably, the dimming circuit comprises a first switch, the first electrode of the first switch is electrically connected to the cathode of the LED string, the second electrode of the first switch is grounded, and the control pole of the first switch is connected to the control circuit.
優選的，電壓變壓電路還包括第二開關、多個電感及二極體。第二開關電連接於外部電源。多個電感順向串聯於第二開關。二極體的陰極電連接於開關及電感，二極體的陽極接地。Preferably, the voltage transformer circuit further includes a second switch, a plurality of inductors, and a diode. The second switch is electrically connected to an external power source. A plurality of inductors are coupled in series to the second switch. The cathode of the diode is electrically connected to the switch and the inductor, and the anode of the diode is grounded.
優選的，電流平衡電路包括多個電流平衡變壓器及多個電容。多個電流平衡變壓器中的電流平衡變壓器的數量比多個發光二極體串數量少1，電流平衡變壓器包括匝數相同的初級繞組與次級繞組。多個電流平衡變壓器的其中第一電流平衡變壓器的初級繞組串聯於第一電感與多個發光二極體串的其中第一發光二極體串之間，第一電流平衡變壓器的次級繞組串聯於第二電感與多個發光二極體串的其中第二發光二極體串之間。多個電流平衡變壓器的其中第二電流平衡變壓器的初級繞組與第一電流平衡變壓器的次級繞組串聯，第二電流平衡變壓器的次級繞組串聯於第三電感與多個發光二極體串的其中第三發光二極體串之間並與多個電流平衡變壓器的其中第三電流平衡變壓器的初級繞組串聯。第三電流平衡變壓器的次級繞組串聯於第四電感與多個發光二極體串的其中第四發光二極體串之間。多個電容其中第一個電容的一端電連接於多個發光二極體串的其中第四個發光二極體串的陽極，另一端接地。Preferably, the current balancing circuit comprises a plurality of current balancing transformers and a plurality of capacitors. The number of current balancing transformers in the plurality of current balancing transformers is less than the number of the plurality of LED strings. The current balancing transformer includes primary windings and secondary windings having the same number of turns. The primary winding of the first current balancing transformer of the plurality of current balancing transformers is connected in series between the first inductor and the first LED string of the plurality of LED strings, and the secondary winding of the first current balancing transformer is connected in series And between the second inductor and the plurality of LED strings of the second LED string. a primary winding of the second current balancing transformer of the plurality of current balancing transformers is connected in series with a secondary winding of the first current balancing transformer, and a secondary winding of the second current balancing transformer is connected in series with the third inductor and the plurality of LED strings The third LED string is connected in series with the primary winding of the third current balancing transformer of the plurality of current balancing transformers. The secondary winding of the third current balancing transformer is connected in series between the fourth inductor and the fourth LED string of the plurality of LED strings. One of the plurality of capacitors is electrically connected to one end of the fourth LED string of the plurality of LED strings, and the other end is grounded.
優選的，電壓變壓電路還包括電感及第三開關。電感電連接於外部電源。第三開關一端電連接於電感相連，一端接地。Preferably, the voltage transformer circuit further includes an inductor and a third switch. The inductor is electrically connected to an external power source. One end of the third switch is electrically connected to the inductor and one end is grounded.
優選的，電流平衡電路還包括多個二極體、多個電容及電流平衡變壓器模組。多個二極體其中第一個二極體順向串聯於第三開關與多個發光二極體串的其中第一個發光二極體串的陽極之間。多個電容其中第一個電容的一端連接於多個發光二極體串的其中第四個發光二極體串的陽極，另一端接地。多個電流平衡變壓器中的電流平衡變壓器的數目比多個發光二極體串數目少1，電流平衡變壓器包括匝數相同的初級繞組與次級繞組。多個電流平衡變壓器的其中第一電流平衡變壓器的初級繞組串聯於多個二極體第一二極體的陰極與多個發光二極體串的其中第一發光二極體串之間，第一電流平衡變壓器的次級繞組串聯於多個電流平衡變壓器的其中第二電流平衡變壓器的初級繞組與多個發光二極體串的其中第二發光二極體串之間。第二電流平衡變壓器的初級繞組與多個二極體的其中第二二極體的陰極串聯，第二電流平衡變壓器的次級繞組串聯於多個二極體的其中第三二極體的陰極與多個發光二極體串的其中第三發光二極體串之間且與多個電流平衡變壓器的其中第三電流平衡變壓器的初級繞組串聯。第三電流平衡變壓器的次級繞組串聯於多個二極體的其中第四二極體的陰極與多個發光二極體串的其中第四發光二極體串之間。Preferably, the current balancing circuit further comprises a plurality of diodes, a plurality of capacitors and a current balancing transformer module. The first diode of the plurality of diodes is connected in series between the third switch and the anode of the first of the plurality of LED strings. One of the plurality of capacitors has one end connected to the anode of the fourth of the plurality of LED strings and the other end of which is grounded. The number of current balancing transformers in the plurality of current balancing transformers is less than one of the plurality of LED strings, and the current balancing transformer includes primary windings and secondary windings having the same number of turns. The primary winding of the first current balancing transformer of the plurality of current balancing transformers is connected in series between the cathode of the plurality of diode first diodes and the first LED string of the plurality of LED strings, A secondary winding of a current balancing transformer is coupled in series between a primary winding of the plurality of current balancing transformers of the second current balancing transformer and a plurality of strings of the plurality of LED strings. The primary winding of the second current balancing transformer is connected in series with the cathode of the second diode of the plurality of diodes, and the secondary winding of the second current balancing transformer is connected in series with the cathode of the third diode of the plurality of diodes The first winding of the third current balancing transformer of the plurality of current balancing transformers is connected in series with the plurality of light emitting diode strings. The secondary winding of the third current balancing transformer is connected in series between the cathode of the fourth diode of the plurality of diodes and the fourth LED string of the plurality of LED strings.
本發明利用一個調光電路就可以控制多個發光二極體串的電流，達到了小型化的目的，不用積體電路（IC）就可以控制發光二極體串的電流，降低了成本。The invention can control the current of the plurality of light-emitting diode strings by using a dimming circuit, and achieves the purpose of miniaturization, and can control the current of the light-emitting diode string without using the integrated circuit (IC), thereby reducing the cost.
100．．．發光二極體驅動系統100. . . Light-emitting diode drive system
101．．．電壓變壓電路101. . . Voltage transformer circuit
101a．．．電壓轉換單元101a. . . Voltage conversion unit
103．．．控制電路103. . . Control circuit
105．．．電流平衡電路105. . . Current balancing circuit
107．．．回饋保護電路107. . . Feedback protection circuit
109．．．調光電路109. . . Dimming circuit
Vcc．．．外部電源Vcc. . . External power supply
L1、L2、L3、L4、S1．．．電感L1, L2, L3, L4, S1. . . inductance
K1、Q1、V1．．．開關K1, Q1, V1. . . switch
T1．．．變壓器T1. . . transformer
T2、N1、M1．．．第一電流平衡變壓器T2, N1, M1. . . First current balancing transformer
T3、N2、M2．．．第二電流平衡變壓器T3, N2, M2. . . Second current balancing transformer
T4、N3、M3．．．第三電流平衡變壓器T4, N3, M3. . . Third current balancing transformer
D1、E1．．．第一二極體D1, E1. . . First diode
D2、E2．．．第二二極體D2, E2. . . Second diode
D3、E3．．．第三二極體D3, E3. . . Third diode
D4、E4．．．第四二極體D4, E4. . . Fourth diode
C1、C2、C3、C4．．．電容C1, C2, C3, C4. . . capacitance
LED1．．．第一發光二極體串LED1. . . First light emitting diode string
LED2．．．第二發光二極體串LED2. . . Second light emitting diode string
LED3．．．第三發光二極體串LED3. . . Third light emitting diode string
LED4．．．第四發光二極體串LED4. . . Fourth LED string
P1、P2、P3、P4．．．二極體組P1, P2, P3, P4. . . Diode group
Y1．．．二極體Y1. . . Dipole
R1．．．第一電阻R1. . . First resistance
R2．．．第二電阻R2. . . Second resistance
R3．．．第三電阻R3. . . Third resistance
R4．．．第四電阻R4. . . Fourth resistor
R5．．．第五電阻R5. . . Fifth resistor
U1．．．比較器U1. . . Comparators
Vref．．．參考電壓Vref. . . Reference voltage
圖1為本發明發光二極體驅動系統一實施方式的模組圖。1 is a block diagram of an embodiment of a light emitting diode driving system of the present invention.
圖2為本發明發光二極體驅動系統的第一實施方式的電路圖。2 is a circuit diagram of a first embodiment of a light emitting diode driving system of the present invention.
圖3為本發明發光二極體驅動系統的第二實施方式的電路圖。3 is a circuit diagram of a second embodiment of a light emitting diode driving system of the present invention.
圖4為本發明發光二極體驅動系統的第三實施方式的電路圖。4 is a circuit diagram of a third embodiment of a light emitting diode driving system of the present invention.
請參閱圖1，為本發明發光二極體驅動系統100的模組圖。如圖1所示，發光二極體驅動系統100包括電壓變壓電路101、控制電路103、電流平衡電路105、回饋保護電路107及調光電路109。電壓變壓電路101用於電連接外部電源Vcc。控制電路103電連接於電壓變壓電路101。電流平衡電路105電連接於電壓變壓電路101與多個發光二極體串200之間。回饋保護電路107電連接於多個發光二極體串200。調光電路109電連接於控制電路103與回饋保護電路107之間。Please refer to FIG. 1 , which is a block diagram of a light emitting diode driving system 100 of the present invention. As shown in FIG. 1, the LED driving system 100 includes a voltage transformer circuit 101, a control circuit 103, a current balancing circuit 105, a feedback protection circuit 107, and a dimming circuit 109. The voltage transformer circuit 101 is for electrically connecting an external power source Vcc. The control circuit 103 is electrically connected to the voltage transformer circuit 101. The current balancing circuit 105 is electrically connected between the voltage transformer circuit 101 and the plurality of LED strings 200. The feedback protection circuit 107 is electrically connected to the plurality of light emitting diode strings 200. The dimming circuit 109 is electrically connected between the control circuit 103 and the feedback protection circuit 107.
圖2為本發明發光二極體驅動系統100的第一實施方式的電路圖。在本實施方式中，電壓變壓電路101包括電壓轉換單元101a及變壓器T1。變壓器T1包括輸入端及輸出端。電壓轉換單元101a電連接於控制電路103，用於將直流電壓轉換成交流電壓。變壓器T1的輸入端與電壓轉換單元101a相連，變壓器T1的輸出端與電流平衡電路105相連。電壓變壓電路101用於將從外部電源Vcc獲得的電壓轉換成交流電壓且完成對交流電壓的升降。在一具體實施例中，電壓轉換單元101a可為全橋式或半橋式電路。2 is a circuit diagram of a first embodiment of a light emitting diode driving system 100 of the present invention. In the present embodiment, the voltage transformer circuit 101 includes a voltage conversion unit 101a and a transformer T1. The transformer T1 includes an input end and an output end. The voltage conversion unit 101a is electrically connected to the control circuit 103 for converting a direct current voltage into an alternating current voltage. The input terminal of the transformer T1 is connected to the voltage conversion unit 101a, and the output terminal of the transformer T1 is connected to the current balancing circuit 105. The voltage transformer circuit 101 is for converting a voltage obtained from the external power source Vcc into an AC voltage and completing the rise and fall of the AC voltage. In a specific embodiment, voltage conversion unit 101a can be a full bridge or half bridge circuit.
控制電路103包括脈寬調變控制器，脈寬調變控制器依據回饋保護電路107的回饋電壓信號以輸出不同週期的脈波以控制調光電路109及電壓變壓電路101。The control circuit 103 includes a pulse width modulation controller. The pulse width modulation controller outputs pulse waves of different periods according to the feedback voltage signal of the feedback protection circuit 107 to control the dimming circuit 109 and the voltage transformer circuit 101.
電流平衡電路105包括多個二極體、多個電容及多個電流平衡變壓器。多個二極體其中第一個二極體D1串聯於變壓器T1的輸出端與多個發光二極體串的其中第一個發光二極體串LED1的陽極之間。多個二極體其中第二個二極體D2串聯於變壓器T1的輸出端與多個發光二極體串的其中第二個發光二極體串LED2的陽極之間。多個二極體其中第三個二極體D3串聯於變壓器T1的輸出端與多個發光二極體串的其中第三個發光二極體串LED3的陽極之間。多個二極體其中第四個二極體D4串聯於變壓器T1的輸出端與多個發光二極體串的其中第四個發光二極體串LED4的陽極之間。多個電容其中第一個電容C1的一端電連接於多個發光二極體串的其中第四個發光二極體串LED4的陽極，另一端接地。多個電容其中第二個電容C2的一端電連接於多個發光二極體串的其中第三個發光二極體串LED3的陽極，另一端接地。多個電容其中第三個電容C3的一端電連接於多個發光二極體串的其中第二個發光二極體串LED2的陽極，另一端接地。多個電容其中第四個電容C4的一端電連接於多個發光二極體串的其中第一個發光二極體串LED1的陽極，另一端接地。The current balancing circuit 105 includes a plurality of diodes, a plurality of capacitors, and a plurality of current balancing transformers. The plurality of diodes have a first diode D1 connected in series between the output of the transformer T1 and the anode of the first of the plurality of LED strings. The plurality of diodes 2 are connected in series between the output of the transformer T1 and the anode of the second of the plurality of LED strings. A plurality of diodes, wherein the third diode D3 is connected in series between the output of the transformer T1 and the anode of the third of the plurality of LED strings of the LED array. The plurality of diodes 4 are connected in series between the output of the transformer T1 and the anode of the fourth of the plurality of LED strings of the LED array. One of the plurality of capacitors is electrically connected to one end of the fourth LED array 4 of the plurality of LED strings, and the other end is grounded. One of the plurality of capacitors is electrically connected to one end of the third LED string 3 of the plurality of LED strings, and the other end is grounded. One of the plurality of capacitors is electrically connected to one end of the second LED string 2 of the plurality of LED strings, and the other end is grounded. One end of the fourth capacitor C4 is electrically connected to the anode of the first one of the plurality of LED strings, and the other end is grounded.
多個電流平衡變壓器中的電流平衡變壓器的數目比多個發光二極體串數目少1，電流平衡變壓器包括匝數相同的初級繞組與次級繞組。多個電流平衡變壓器中的第一電流平衡變壓器T2的初級繞組串聯於多個二極體的其中第一二極體D1的陰極與多個發光二極體串的其中第一發光二極體串LED1之間，第一電流平衡變壓器T1的次級繞組串聯於多個電流平衡變壓器的其中第二電流平衡變壓器T3的初級繞組與多個發光二極體串的其中第二發光二極體串LED2之間。多個電流平衡變壓器的其中第二電流平衡變壓器T3的初級繞組與第二二極體D2的陰極串聯，第二電流平衡變壓器T3的次級繞組串聯於多個二極體的其中第三二極體D3的陰極與多個發光二極體的其中第三發光二極體串LED3之間且與多個電流平衡變壓器模組的其中第三電流平衡變壓器T4的初級繞組串聯。第三電流平衡變壓器T4的次級繞組串聯於多個二極體的其中第四二極體D4的陰極與多個發光二極體串的其中第四發光二極體串LED4之間。電流平衡電路105用於平衡驅動多個發光二極體串中的各發光二極體串之間的電流。The number of current balancing transformers in the plurality of current balancing transformers is less than one of the plurality of LED strings, and the current balancing transformer includes primary windings and secondary windings having the same number of turns. The primary winding of the first current balancing transformer T2 of the plurality of current balancing transformers is connected in series to the cathode of the first diode D1 and the first LED string of the plurality of LED strings of the plurality of diodes Between the LEDs 1, the secondary winding of the first current balancing transformer T1 is connected in series to the primary winding of the second current balancing transformer T3 and the plurality of LED strings of the plurality of current balancing transformers, wherein the second LED string LED2 between. The primary winding of the second current balancing transformer T3 of the plurality of current balancing transformers is connected in series with the cathode of the second diode D2, and the secondary winding of the second current balancing transformer T3 is connected in series with the third diode of the plurality of diodes The cathode of the body D3 is connected in series with the third light-emitting diode string LED3 of the plurality of light-emitting diodes and in series with the primary winding of the third current-balance transformer T4 of the plurality of current balancing transformer modules. The secondary winding of the third current balancing transformer T4 is connected in series between the cathode of the fourth diode D4 of the plurality of diodes and the fourth LED array LED 4 of the plurality of LED strings. The current balancing circuit 105 is for balancingly driving current between each of the plurality of LED strings.
回饋保護電路107包括電壓回饋單元及電壓保護單元。電壓回饋單元包括第一電阻R1、第二電阻R2、第三電阻R3、第四電阻R4及多組由兩個二極體組成的二極體組。第一電阻R1電連接於外部電源Vcc。第二電阻R2一端電連接於控制電路103，一端電連接於多組二極體的陽極。多個發光二極體串的其中第一個發光二極體串LED1的陰極電連接於多組二極體組的其中第一組二極體組P1之間，多個發光二極體串的其中第二個發光二極體串LED2的陰極電連接於多組二極體組的其中第二組二極體組P2之間，多個發光二極體串的其中第三個發光二極體串LED3的陰極電連接於多組二極體組的其中第二組二極體組P3之間，多個發光二極體串的其中第四個發光二極體串LED4的陰極電連接於多組二極體組的其中第二組二極體組P4之間。第三電阻R3電連接於4組二極體組的陰極，第四電阻R4一端電連接於第三電阻，一端接地。The feedback protection circuit 107 includes a voltage feedback unit and a voltage protection unit. The voltage feedback unit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a plurality of sets of diodes composed of two diodes. The first resistor R1 is electrically connected to the external power source Vcc. One end of the second resistor R2 is electrically connected to the control circuit 103, and one end is electrically connected to the anodes of the plurality of sets of diodes. a cathode of the first light-emitting diode string LED1 of the plurality of light-emitting diode strings is electrically connected between the first group of diode groups P1 of the plurality of sets of diodes, and the plurality of light-emitting diode strings are The cathode of the second LED string LED2 is electrically connected between the second group of diodes P2 of the plurality of sets of diodes, and the third of the plurality of LED strings The cathode of the string LED3 is electrically connected between the second group of diodes P3 of the plurality of sets of diodes, and the cathode of the fourth LED array 4 of the plurality of LED strings is electrically connected to the cathode Among the group of diodes, the second group of diodes is between P4. The third resistor R3 is electrically connected to the cathodes of the four sets of diodes, and one end of the fourth resistor R4 is electrically connected to the third resistor, and one end is grounded.
電壓保護單元包括第五電阻R5及比較器U1。第五電阻R5一端電連接於第一電阻R1與第二電阻R2之間，一端接地。比較器U1包括第一輸入端、第二輸入端及輸出端，比較器U1的第一輸入端電連接於第五電阻R5，比較器U1的第二輸入端為參考電壓Vref端，比較器U1的輸出端電連接於控制電路109。The voltage protection unit includes a fifth resistor R5 and a comparator U1. One end of the fifth resistor R5 is electrically connected between the first resistor R1 and the second resistor R2, and one end is grounded. The comparator U1 includes a first input end, a second input end, and an output end. The first input end of the comparator U1 is electrically connected to the fifth resistor R5, and the second input end of the comparator U1 is the reference voltage Vref end, and the comparator U1 The output is electrically coupled to control circuit 109.
回饋保護電路107回饋用於依據多個發光二極體串中各發光二極體串的陰極最大電壓作為回饋信號，回饋至控制電路109，且依據多個發光二極體串陰極的最小電壓與參考電壓Vref比較後，產生保護信號後並發送至控制電路103，以控制電壓變壓電路101的電壓。其中，電壓保護單元取得的電壓大於比較器U1的參考電壓Vref時，比較器U1的輸出端輸出低電平信號給控制電路103，使得控制電路103停止工作。當電壓保護單元取得的電壓小於比較器U1的參考電壓Vref時，比較器U1的輸出端輸出高電平給控制電路103，使得控制電路103正常工作。The feedback protection circuit 107 feeds back the maximum voltage of the cathode according to each of the plurality of LED strings as a feedback signal, and feeds back to the control circuit 109, and according to the minimum voltage of the plurality of LEDs of the LED series After the reference voltage Vref is compared, a protection signal is generated and sent to the control circuit 103 to control the voltage of the voltage transformer circuit 101. When the voltage obtained by the voltage protection unit is greater than the reference voltage Vref of the comparator U1, the output terminal of the comparator U1 outputs a low level signal to the control circuit 103, so that the control circuit 103 stops operating. When the voltage obtained by the voltage protection unit is less than the reference voltage Vref of the comparator U1, the output terminal of the comparator U1 outputs a high level to the control circuit 103, so that the control circuit 103 operates normally.
調光電路109包括開關K1，開關K1的第一電極電連接於多個發光二極體串中的各發光二極體串的陰極，開關K1的第二電極接地，開關K1的控制極與控制電路103相連。開關K1為N型非金屬場效應管，開關K1的第一電極為N型非金屬場效應管的漏極，開關K1的第二電極為N型非金屬場效應管的源極，開關K1的控制極為N型非金屬場效應管的柵極。控制電路103藉由控制N型非金屬場效應管的柵極的通斷時間來控制發光二極體串的燈光亮度。The dimming circuit 109 includes a switch K1, the first electrode of the switch K1 is electrically connected to the cathode of each of the plurality of LED strings, the second electrode of the switch K1 is grounded, and the control electrode and the control of the switch K1 Circuitry 103 is connected. The switch K1 is an N-type non-metal FET, the first electrode of the switch K1 is the drain of the N-type non-metal FET, the second electrode of the switch K1 is the source of the N-type non-metal FET, and the switch K1 Control the gate of an extremely N-type non-metallic FET. The control circuit 103 controls the brightness of the light of the LED string by controlling the on-off time of the gate of the N-type non-metallic field effect transistor.
圖3為本發明發光二極體驅動系統的第二實施方式的電路圖。在本實施方式中，電壓變壓電路101還包括開關Q1、多個電感及二極體Y1。開關Q1電連接於外部電源Vcc。多個電感中的其中第一電感L1電連接於開關Q1與多個發光二極體串中的其中第一發光二極體串LED1的陽極之間。多個電感中的第二電感L2電連接於開關Q1與多個發光二極體串中的第二發光二極體串LED2的陽極之間。多個電感中的第三電感L3電連接於開關Q1與多個發光二極體串中的第三發光二極體串LED3的陽極之間。多個電感中的第四電感L4電連接於開關Q1與多個發光二極體串中的第四發光二極體串LED4的陽極之間。二極體Y1的陰極電連接於開關Q1及電感，二極體Y1的陽極接地。開關Q1第一次斷開的時候，電感會產生與之相同的愣次電流，當開關K1第二次導通時，第一次電感產生的電壓會和外部電源疊加達到了升壓的目的。3 is a circuit diagram of a second embodiment of a light emitting diode driving system of the present invention. In the present embodiment, the voltage transformer circuit 101 further includes a switch Q1, a plurality of inductors, and a diode Y1. The switch Q1 is electrically connected to the external power source Vcc. The first inductor L1 of the plurality of inductors is electrically connected between the switch Q1 and an anode of the first LED array LED1 of the plurality of LED strings. The second inductor L2 of the plurality of inductors is electrically connected between the switch Q1 and the anode of the second LED string LED2 of the plurality of LED strings. The third inductor L3 of the plurality of inductors is electrically connected between the switch Q1 and the anode of the third LED string LED3 of the plurality of LED strings. The fourth inductor L4 of the plurality of inductors is electrically connected between the switch Q1 and the anode of the fourth LED array LED 4 of the plurality of LED strings. The cathode of the diode Y1 is electrically connected to the switch Q1 and the inductor, and the anode of the diode Y1 is grounded. When the switch Q1 is disconnected for the first time, the inductor will generate the same current. When the switch K1 is turned on for the second time, the voltage generated by the first inductor will be superimposed with the external power supply to achieve the boosting purpose.
電流平衡電路105包括多個電流平衡變壓器及多個電容。多個電流平衡變壓器中的電流平衡變壓器數量比多個發光二極體串數量少1，電流平衡變壓器包括匝數相同的初級繞組與次級繞組。多個電流平衡變壓器的其中第一電流平衡變壓器N1的初級繞組串聯於第一電感L1與多個發光二極體串中的第一發光二極體串LED1之間，第一電流平衡變壓器N1的次級繞組串聯於第二電感L2與多個發光二極體串中的第二發光二極體串LED2之間。多個電流平衡變壓器的其中第二電流平衡變壓器N2的初級繞組與第一電流平衡變壓器N1的次級繞組串聯，第二電流平衡變壓器N2的次級繞組串聯於第三電感L3與多個發光二極體串中的第三發光二極體LED3串之間並與多個電流平衡變壓器的其中第三電流平衡變壓器N3的初級繞組串聯。第三電流平衡變壓器N3的次級繞組串聯於第四電感L4與多個發光二極體串的其中第四發光二極體串LED4之間。多個電容的其中第一個電容C1的一端電連接於多個發光二極體串的其中第四個發光二極體串LED4的陽極，另一端接地。多個電容其中第二個電容C2的一端電連接於多個發光二極體串的其中第三個發光二極體串LED3的陽極，另一端接地。多個電容其中第三個電容C3的一端電連接於多個發光二極體串的其中第二個發光二極體串LED2的陽極，另一端接地。多個電容其中第四個電容C4的一端電連接於多個發光二極體串的其中第一個發光二極體串LED1的陽極，另一端接地。The current balancing circuit 105 includes a plurality of current balancing transformers and a plurality of capacitors. The number of current balancing transformers in the plurality of current balancing transformers is less than the number of the plurality of LED strings. The current balancing transformer includes primary windings and secondary windings having the same number of turns. The primary winding of the first current balancing transformer N1 of the plurality of current balancing transformers is connected in series between the first inductor L1 and the first LED string LED1 of the plurality of LED strings, the first current balancing transformer N1 The secondary winding is connected in series between the second inductor L2 and the second LED array LED 2 of the plurality of LED strings. The primary winding of the second current balancing transformer N2 of the plurality of current balancing transformers is connected in series with the secondary winding of the first current balancing transformer N1, and the secondary winding of the second current balancing transformer N2 is connected in series with the third inductor L3 and the plurality of light emitting diodes The third light-emitting diode LED3 string in the pole body string is connected in series with the primary winding of the plurality of current balancing transformers of the third current balancing transformer N3. The secondary winding of the third current balancing transformer N3 is connected in series between the fourth inductor L4 and the fourth LED string LED4 of the plurality of LED strings. One end of the first capacitor C1 of the plurality of capacitors is electrically connected to the anode of the fourth LED array 4 of the plurality of LED strings, and the other end is grounded. One of the plurality of capacitors is electrically connected to one end of the third LED string 3 of the plurality of LED strings, and the other end is grounded. One of the plurality of capacitors is electrically connected to one end of the second LED string 2 of the plurality of LED strings, and the other end is grounded. One end of the fourth capacitor C4 is electrically connected to the anode of the first one of the plurality of LED strings, and the other end is grounded.
圖4為本發明發光二極體驅動系統的第三實施方式的電路圖。在本實施方式中，電壓變壓電路101還包括電感S1及開關V1。電感S1電連接於外部電源Vcc。開關V1一端電連接於電感S1，一端接地。4 is a circuit diagram of a third embodiment of a light emitting diode driving system of the present invention. In the present embodiment, the voltage transformer circuit 101 further includes an inductor S1 and a switch V1. The inductor S1 is electrically connected to the external power source Vcc. One end of the switch V1 is electrically connected to the inductor S1, and one end is grounded.
電流平衡電路105還包括多個二極體、多個電流平衡變壓器及多個電容。多個二極體其中第一個二極體E1順向串聯於電感S1與多個發光二極體串的其中第一個發光二極體串LED1的陽極之間。多個二極體的其中第二個二極體E2順向串聯於電感S1與多個發光二極體串的其中第二個發光二極體串LED2的陽極之間。多個二極體的其中第三個二極體E3順向串聯於電感S1與多個發光二極體串的其中第三個發光二極體串LED3的陽極之間。多個二極體的其中第四個二極體E4順向串聯於電感S1與多個發光二極體串的其中第四個發光二極體串LED4的陽極之間。多個電容其中第一個電容C1的一端電連接於多個發光二極體串的其中第四個發光二極體串LED4的陽極，另一端接地。多個電容其中第二個電容C2的一端電連接於多個發光二極體串的其中第三個發光二極體串LED3的陽極，另一端接地。多個電容其中第三個電容C3的一端電連接於多個發光二極體串的其中第二個發光二極體串LED2的陽極，另一端接地。多個電容其中第四個電容C4的一端電連接於多個發光二極體串的其中第一個發光二極體串LED1的陽極，另一端接地。The current balancing circuit 105 further includes a plurality of diodes, a plurality of current balancing transformers, and a plurality of capacitors. The plurality of diodes have a first diode E1 connected in series between the inductor S1 and the anode of the first one of the plurality of LED strings. The second diode E2 of the plurality of diodes is connected in series between the inductor S1 and the anode of the second LED string LED2 of the plurality of LED strings. The third diode E3 of the plurality of diodes is connected in series between the inductor S1 and the anode of the third LED string LED3 of the plurality of LED strings. The fourth diode E4 of the plurality of diodes is connected in series between the inductor S1 and the anode of the fourth LED array LED4 of the plurality of LED strings. One of the plurality of capacitors is electrically connected to one end of the fourth LED array 4 of the plurality of LED strings, and the other end is grounded. One of the plurality of capacitors is electrically connected to one end of the third LED string 3 of the plurality of LED strings, and the other end is grounded. One of the plurality of capacitors is electrically connected to one end of the second LED string 2 of the plurality of LED strings, and the other end is grounded. One end of the fourth capacitor C4 is electrically connected to the anode of the first one of the plurality of LED strings, and the other end is grounded.
多個電流平衡變壓器的數目比多個發光二極體串數目少1，電流平衡變壓器包括匝數相同的初級繞組與次級繞組。多個電流平衡變壓器的其中第一電流平衡變壓器M1的初級繞組串聯於多個二極體的其中第一二極體E1的陰極與多個發光二極體串的其中第一發光二極體串LED1之間，第一電流平衡變壓器M1的次級繞組串聯於多個電流平衡變壓器的其中第二電流平衡變壓器M2的初級繞組與多個發光二極體串的其中第二發光二極體串LED2之間。第二電流平衡變壓器M2的初級繞組與多個二極體的其中第二二極體E2的陰極串聯，第二電流平衡變壓器M2的次級繞組串聯於多個二極體的其中第三二極體E3的陰極與多個發光二極體串的其中第三發光二極體串LED3之間且與多個電流平衡變壓器的其中第三電流平衡變壓器M3的初級繞組串聯。第三電流平衡變壓器M3的次級繞組串聯於多個二極體的其中第四二極體E4的陰極與多個發光二極體串的其中第四發光二極體LED4串之間。The number of the plurality of current balancing transformers is one less than the number of the plurality of LED strings, and the current balancing transformer includes the primary winding and the secondary winding having the same number of turns. The primary winding of the first current balancing transformer M1 of the plurality of current balancing transformers is connected in series to the cathode of the first diode E1 and the first LED string of the plurality of LED strings of the plurality of diodes Between the LEDs 1, the secondary winding of the first current balancing transformer M1 is connected in series to the primary winding of the second current balancing transformer M2 and the plurality of LED strings of the plurality of current balancing transformers, wherein the second LED string LED2 between. The primary winding of the second current balancing transformer M2 is connected in series with the cathode of the plurality of diodes of the second diode E2, and the secondary winding of the second current balancing transformer M2 is connected in series with the third diode of the plurality of diodes The cathode of the body E3 is connected in series with the third light-emitting diode string LED3 of the plurality of light-emitting diode strings and in series with the primary winding of the plurality of current balancing transformers of the third current balancing transformer M3. The secondary winding of the third current balancing transformer M3 is connected in series between the cathode of the fourth diode E4 of the plurality of diodes and the string of the fourth LEDs 44 of the plurality of LED strings.
本發明利用一個MOSFET組成的調光電路就可以控制多個發光二極體串的電流，達到了小型化的目的，不用IC就可以控制發光二極體串的電流降低了成本。The invention can control the current of a plurality of light-emitting diode strings by using a dimming circuit composed of a MOSFET, thereby achieving the purpose of miniaturization, and the current of the LED string can be controlled without the IC, thereby reducing the cost.
100．．．發光二極體驅動系統100. . . Light-emitting diode drive system
200．．．發光二極體串200. . . Light-emitting diode string
101．．．電壓變壓電路101. . . Voltage transformer circuit
103．．．控制電路103. . . Control circuit
105．．．電流平衡電路105. . . Current balancing circuit
107．．．回饋保護電路107. . . Feedback protection circuit
109．．．調光電路109. . . Dimming circuit
Vcc．．．外部電源Vcc. . . External power supply
Claims (10)
電壓變壓電路，用於電連接於外部電源，用於將從該外部電源獲得電壓轉換成交流電壓且對所轉換成的交流電壓進行升降壓轉換；
控制電路，電連接於該電壓變壓電路，用於控制該電壓變壓電路；
電流平衡電路，電連接於該電壓變壓電路與該多個發光二極體串陽極之間，用於平衡驅動該多個發光二極體串中各發光二極體串的電流；
回饋保護電路，電連接於該多個發光二極體串陰極，用於依據發光二極體串陰極最大電壓作為回饋信號，回饋至該控制電路，且依據該多個發光二極體串陰極的最小電壓與參考電壓比較後，產生保護信號後並發送至該控制電路，以控制該電壓變壓電路的電壓；及
調光電路，電連接於該控制電路與該回饋保護電路之間，用於調節該多個發光二極體串的燈光亮度。An LED driving system for driving a plurality of LED strings, the LED driving system comprising:
a voltage transformer circuit for electrically connecting to an external power source for converting a voltage obtained from the external power source into an AC voltage and performing a buck-boost conversion on the converted AC voltage;
a control circuit electrically connected to the voltage transformer circuit for controlling the voltage transformer circuit;
a current balancing circuit electrically connected between the voltage converting circuit and the plurality of LED array anodes for balancingly driving currents of the plurality of LED strings in the plurality of LED strings;
a feedback protection circuit electrically connected to the plurality of LED strings and cathodes for feeding back to the control circuit according to the maximum voltage of the LEDs of the LEDs, and according to the plurality of LEDs After the minimum voltage is compared with the reference voltage, a protection signal is generated and sent to the control circuit to control the voltage of the voltage transformer circuit; and a dimming circuit is electrically connected between the control circuit and the feedback protection circuit for Adjusting the brightness of the plurality of light emitting diode strings.
多個二極體及多個電容，該多個二極體其中一個第一二極體串聯於該變壓器的輸出端與該多個發光二極體串的其中一個第一發光二極體串的陽極之間，該多個電容其中一個第一電容的一端該多個發光二極體串的其中第四發光二極體串的陽極，且另一端接地；及
多個電流平衡變壓器，該電流平衡變壓器的數目比該多個發光二極體串數目少1，該電流平衡變壓器包括匝數相同的初級繞組與次級繞組，該多個電流平衡變壓器的其中第一電流平衡變壓器的初級繞組串聯於該第一二極體的陰極與該多個發光二極體的其中第一發光二極體串之間，該第一電流平衡變壓器的次級繞組串聯於該多個電流平衡變壓器的其中第二電流平衡變壓器的初級繞組與該多個發光二極體的其中第二發光二極體串之間，該第二電流平衡變壓器的初級繞組與第二二極體的陰極串聯，該第二電流平衡變壓器的次級繞組串聯於第三二極體的陰極與該多個發光二極體的其中第三發光二極體串之間且與該多個電流平衡變壓器的其中第三電流平衡變壓器的初級繞組串聯，該第三電流平衡變壓器的次級繞組串聯於第四二極體的陰極與該多個發光二極體的其中第四發光二極體之間。The illuminating diode driving system of claim 2, wherein the current balancing circuit comprises:
a plurality of diodes and a plurality of capacitors, wherein the first diodes of the plurality of diodes are connected in series to the output end of the transformer and one of the first LED strings of the plurality of LED strings Between the anodes, one end of the first capacitor is one end of the plurality of LED strings of the fourth LED string, and the other end is grounded; and a plurality of current balancing transformers, the current balance The number of transformers is less than one of the plurality of LED strings, the current balance transformer comprising a primary winding and a secondary winding having the same number of turns, wherein the primary windings of the first current balancing transformer of the plurality of current balancing transformers are connected in series Between the cathode of the first diode and the first LED string of the plurality of LEDs, the secondary winding of the first current balancing transformer is connected in series to the second of the plurality of current balancing transformers a primary winding of the current balancing transformer and a second LED string of the plurality of LEDs, wherein a primary winding of the second current balancing transformer is connected in series with a cathode of the second diode a secondary winding of the two current balancing transformer is connected in series between the cathode of the third diode and the third LED string of the plurality of LEDs and balanced with a third current of the plurality of current balancing transformers The primary winding of the transformer is connected in series, and the secondary winding of the third current balancing transformer is connected in series between the cathode of the fourth diode and the fourth of the plurality of LEDs.
電壓回饋單元，包括第一電阻、第二電阻、第三電阻、第四電阻及多組由兩個二極體組成的二極體組，該第一電阻電連接於該外部電源，該第二電阻一端電連接於該第一電阻，另一端電連接於該多組二極體的陽極，該多個發光二極體串的其中第一個發光二極體串的陰極連接於該多組二極體組的其中第一組二極體組之間，該第三電阻電連接於該多組二極體組的陰極，該第四電阻一端電連接於該第三電阻，另一端接地；
電壓保護單元，包括第五電阻及比較器，該第五電阻一端電連接於該第一電阻與該第二電阻之間，一端接地；
該比較器包括第一輸入端、第二輸入端及輸出端，該比較器的第一輸入端電連接於該第五電阻，該比較器的第二輸入端為電壓參考端，該比較器的輸出端電連接於該控制電路；
其中,該電壓保護單元取得的電壓大於該比較器的參考電壓時，該比較器的輸出端輸出低電平信號給該控制電路，使得該控制電路停止工作；
當該電壓保護單元取得的電壓小於該比較器的參考電壓時，該比較器的輸出端輸出高電平給該控制電路，使得該控制電路正常工作。The illuminating diode driving system of claim 4, wherein the feedback protection circuit comprises:
The voltage feedback unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a plurality of sets of diodes composed of two diodes, the first resistor being electrically connected to the external power source, the second One end of the resistor is electrically connected to the first resistor, and the other end is electrically connected to the anode of the plurality of diodes, and the cathode of the first LED string of the plurality of LED strings is connected to the plurality of groups The third resistor is electrically connected to the cathode of the plurality of diode groups, and the fourth resistor is electrically connected to the third resistor and the other end is grounded;
The voltage protection unit includes a fifth resistor and a comparator, and one end of the fifth resistor is electrically connected between the first resistor and the second resistor, and one end is grounded;
The comparator includes a first input end, a second input end, and an output end, the first input end of the comparator is electrically connected to the fifth resistor, and the second input end of the comparator is a voltage reference end, the comparator The output end is electrically connected to the control circuit;
Wherein, when the voltage obtained by the voltage protection unit is greater than the reference voltage of the comparator, the output end of the comparator outputs a low level signal to the control circuit, so that the control circuit stops working;
When the voltage obtained by the voltage protection unit is less than the reference voltage of the comparator, the output of the comparator outputs a high level to the control circuit, so that the control circuit operates normally.
第二開關，電連接於該外部電源；
多個電感，該多個電感順向串聯於該第二開關；及
二極體，該二極體的陰極電連接於該開關及該電感，該二極體的陽極接地。The illuminating diode driving system of claim 2, wherein the voltage transformer circuit further comprises:
a second switch electrically connected to the external power source;
a plurality of inductors, the plurality of inductors are connected in series to the second switch; and a diode, a cathode of the diode is electrically connected to the switch and the inductor, and an anode of the diode is grounded.
多個電容，該多個電容其中第一個電容的一端電連接於該多個發光二極體串的其中第四個發光二極體串的陽極，另一端接地。The illuminating diode driving system of claim 7, wherein the current balancing circuit comprises a plurality of current balancing transformers, the number of the plurality of current balancing transformers being less than the number of the plurality of illuminating diode strings The current balancing transformer includes a primary winding and a secondary winding having the same number of turns, wherein the primary winding of the first current balancing transformer of the plurality of current balancing transformers is connected in series with the first inductor and the plurality of LED strings Between a string of light-emitting diodes, a secondary winding of the first current balancing transformer is connected in series between the second inductor and a second LED string of the plurality of LED strings, the plurality of current balances a primary winding of the second current balancing transformer of the transformer is connected in series with a secondary winding of the first current balancing transformer, and a secondary winding of the second current balancing transformer is connected in series with the third inductor and the plurality of LED strings a third light-emitting diode string is connected in series with a primary winding of the plurality of current balancing transformers of the third current balancing transformer, the third current balancing transformer The secondary winding is connected in series between the fourth inductor and the fourth LED string of the plurality of LED strings; and a plurality of capacitors, wherein one end of the first capacitor is electrically connected to the The anode of the fourth light-emitting diode string of the plurality of light-emitting diode strings is grounded at the other end.
多個二極體及多個電容，該多個二極體其中第一個二極體順向串聯於該電感與該多個發光二極體串的其中第一個發光二極體串的陽極之間，該多個電容其中第一個電容的一端電連接於該多個發光二極體串的其中的第四個發光二極體串的陽極，另一端接地；及
多個電流平衡變壓器，該多個電流平衡變壓器的數目比該多個發光二極體串數目少1，該電流平衡變壓器模組中的電流平衡變壓器包括匝數相同的初級繞組與次級繞組，該多個電流平衡變壓器的其中第一電流平衡變壓器的初級繞組串聯於該多個二極體的其中第一二極體的陰極與該多個發光二極體串的其中第一發光二極體串之間，該第一電流平衡變壓器的次級繞組串聯於該多個電流平衡變壓器的其中第二電流平衡變壓器的初級繞組與該多個發光二極體串的其中第二發光二極體串之間，該第二電流平衡變壓器的初級繞組與第二二極體的陰極串聯，該第二電流平衡變壓器的次級繞組串聯於第三二極體的陰極與該多個發光二極體串的其中第三發光二極體串之間且與述該多個電流平衡變壓器的其中第三電流平衡變壓器的初級繞組串聯，該第三電流平衡變壓器的次級繞組串聯於第四二極體的陰極與該多個發光二極體串的其中第四發光二極體串之間。
The illuminating diode driving system of claim 9, wherein the current balancing circuit comprises:
a plurality of diodes and a plurality of capacitors, wherein the first diodes are forwardly connected in series to the anode of the inductor and the first of the plurality of LED strings Between the plurality of capacitors, one end of the first capacitor is electrically connected to the anode of the fourth LED string of the plurality of LED strings, and the other end is grounded; and a plurality of current balancing transformers, The number of the plurality of current balancing transformers is one less than the number of the plurality of LED strings, and the current balancing transformer in the current balancing transformer module includes a primary winding and a secondary winding having the same number of turns, and the plurality of current balancing transformers The primary winding of the first current balancing transformer is connected in series between the cathode of the first diode of the plurality of diodes and the first LED string of the plurality of LED strings. a secondary winding of a current balancing transformer is connected in series between a primary winding of the second current balancing transformer and a second LED string of the plurality of LED strings, the second Current balance a primary winding of the transformer is connected in series with a cathode of the second diode, and a secondary winding of the second current balancing transformer is connected in series to a cathode of the third diode and a third LED of the plurality of LED strings Between the strings and in series with the primary winding of the third current balancing transformer of the plurality of current balancing transformers, the secondary winding of the third current balancing transformer is connected in series to the cathode of the fourth diode and the plurality of light emitting diodes The body string is between the fourth light-emitting diode strings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW102114924A TW201442555A (en) | 2013-04-26 | 2013-04-26 | Light emitting diode driving system |
Applications Claiming Priority (1)
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| TW102114924A TW201442555A (en) | 2013-04-26 | 2013-04-26 | Light emitting diode driving system |
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| TW201442555A true TW201442555A (en) | 2014-11-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI508629B (en) * | 2014-11-07 | 2015-11-11 | ||
| CN105704873A (en) * | 2014-11-28 | 2016-06-22 | 昱京能源科技股份有限公司 | Isolation type light modulation circuit structure |
-
2013
- 2013-04-26 TW TW102114924A patent/TW201442555A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI508629B (en) * | 2014-11-07 | 2015-11-11 | ||
| CN105704873A (en) * | 2014-11-28 | 2016-06-22 | 昱京能源科技股份有限公司 | Isolation type light modulation circuit structure |
| CN105704873B (en) * | 2014-11-28 | 2019-06-21 | 昱京能源科技股份有限公司 | Isolated light adjusting circuit structure |
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