CN105873278B - Multi-mode dimming power supply circuit - Google Patents
Multi-mode dimming power supply circuit Download PDFInfo
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- CN105873278B CN105873278B CN201610341282.0A CN201610341282A CN105873278B CN 105873278 B CN105873278 B CN 105873278B CN 201610341282 A CN201610341282 A CN 201610341282A CN 105873278 B CN105873278 B CN 105873278B
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Abstract
本发明公开了一种多模式调光电源电路，包括依次相连的输入整流滤波电路、高频变压切换电路、输出整流滤波电路、恒流恒压输出端调光控制电路，还包括调光控制电路，所述调光控制电路分别连接所述输入整流滤波电路和所述高频变压切换电路，本发明多模式调光电源电路既可以在输入端进行LED调光，也可以在输出端进行LED调光，完全改变现有技术的单模式调光方法，极大提高了LED调光的便利性。
The present invention discloses a multi-mode dimming power supply circuit, comprising an input rectifier filter circuit, a high-frequency transformer switching circuit, an output rectifier filter circuit, and a constant current and constant voltage output end dimming control circuit connected in sequence, and also comprising a dimming control circuit, wherein the dimming control circuit is respectively connected to the input rectifier filter circuit and the high-frequency transformer switching circuit. The multi-mode dimming power supply circuit of the present invention can perform LED dimming at both the input end and the output end, completely changing the single-mode dimming method of the prior art and greatly improving the convenience of LED dimming.
Description
技术领域technical field
本发明涉及LED电源技术领域，具体涉及一种多模式调光电源电路。The invention relates to the technical field of LED power supplies, in particular to a multi-mode dimming power supply circuit.
背景技术Background technique
目前市场上使用LED电源实现LED调光的方式有两种，一种是通过输入端的信号进行调节；譬如电力载波控制和可控硅调节，另一种是通过LED输出端的信号接口接受控制信号，现有技术LED电源要么只能在输入端调节，要么只能在输出端调节，这就限制了调光的灵活性，因此亟待改进。At present, there are two ways to use LED power supply to realize LED dimming in the market. One is to adjust through the signal at the input end; such as power carrier control and thyristor adjustment, and the other is to accept the control signal through the signal interface at the output end of the LED. In the prior art, the LED power supply can only be adjusted at the input end, or can only be adjusted at the output end, which limits the flexibility of dimming, so it needs to be improved urgently.
发明内容Contents of the invention
本发明要解决的技术问题在于，针对现有技术的不足，提供一种多模式调光电源电路，克服现有技术LED电源只能采用或在输入端或在输出端进行调光的单一模式，因此限制调光灵活性的缺陷。The technical problem to be solved by the present invention is to provide a multi-mode dimming power supply circuit in view of the deficiencies of the prior art, so as to overcome the fact that the LED power supply in the prior art can only adopt a single mode of dimming at the input end or at the output end, Hence the drawback of limiting dimming flexibility.
本发明为解决上述技术问题所采用的技术方案为：The technical scheme that the present invention adopts for solving the problems of the technologies described above is:
一种多模式调光电源电路，包括依次相连的输入整流滤波电路、高频变压切换电路、输出整流滤波电路、恒流恒压输出端调光控制电路，还包括调光控制电路，所述调光控制电路分别连接所述输入整流滤波电路和所述高频变压切换电路，其中所述调光控制电路包括依次相连的偏置供电电路和控制电路，所述偏置供电电路包括三极管Q2、齐纳二极管D1、电阻R7、电阻R27、电阻R26、有极性电容C18、有极性电容C4、二极管D3和电阻R18，齐纳二极管D1的负极连接三极管Q2的基极，齐纳二极管D1的正极接地，有极性电容C4的正极连接二极管D3的负极，有极性电容C4的负极接地，电阻R18的一端连接二极管D3的正极，另一端连接变压器T1一次侧非同名端5，电阻R7的一端连接齐纳二极管D1的负极，另一端连接有极性电容C4的正极，电阻R27和电阻R26串联后，电阻R26连接三极管Q2的发射极，电阻R27连接变压器T1一次侧同名端1，有极性电容C18的正极连接三极管Q2的发射极和光电耦合器U2的接线端4，有极性电容C18的负极接地；所述控制电路包括主控芯片U1、电阻R4、电阻R5、电阻R10、电阻R22、电阻R23、电阻R25、电阻R30、电阻R31、电阻R35、电容C3、电容C8和电容C9，电阻R30和电阻R31并联后，两端分别连接电阻R23和电阻R22，电阻R22的两端分别连接电阻R31和光电耦合器U2的接线端3，电阻R30、电阻R31和电阻R22的共极端接地，电阻R23的一端连接主控芯片U1管脚4，另一端连接电阻R30、电阻R31以及场效应管Q1源极的共极端，电容C3的一端连接主控芯片U1管脚4，另一端接地，电阻R10与电容C9并联后，一端连接电阻R25，另一端连接主控芯片U1管脚2，电阻R25的两端分别连接电阻R10和光电耦合器U2的接线端3，电阻R11与电容C8并联后，一端连接主控芯片U1管脚3，另一端接地，电阻R5与电阻R4串联后，电阻R5连接变压器T1的同名端1，电阻R4连接主控芯片U1管脚3，电阻R35的两端分别连接变压器T1一次侧非同名端5和主控芯片U1管脚5，主控芯片U1管脚6接地，主控芯片U1管脚7连接电阻R34。A multi-mode dimming power supply circuit, including sequentially connected input rectification and filtering circuit, high-frequency transformer switching circuit, output rectification and filtering circuit, constant current and constant voltage output end dimming control circuit, and also includes a dimming control circuit, said The dimming control circuit is respectively connected to the input rectification filter circuit and the high-frequency transformer switching circuit, wherein the dimming control circuit includes a bias power supply circuit and a control circuit connected in sequence, and the bias power supply circuit includes a triode Q2 , Zener diode D1, resistor R7, resistor R27, resistor R26, polarized capacitor C18, polarized capacitor C4, diode D3 and resistor R18, the negative pole of Zener diode D1 is connected to the base of transistor Q2, Zener diode D1 The positive pole of the polarized capacitor C4 is connected to the negative pole of the diode D3, the negative pole of the polarized capacitor C4 is grounded, one end of the resistor R18 is connected to the positive pole of the diode D3, the other end is connected to the non-identical terminal 5 of the primary side of the transformer T1, and the resistor R7 One end of the Zener diode D1 is connected to the negative pole, and the other end is connected to the positive pole of the polarized capacitor C4. After the resistor R27 and the resistor R26 are connected in series, the resistor R26 is connected to the emitter of the triode Q2, and the resistor R27 is connected to the same-named terminal 1 of the primary side of the transformer T1. The positive pole of the polar capacitor C18 is connected to the emitter of the triode Q2 and the terminal 4 of the photocoupler U2, and the negative pole of the polar capacitor C18 is grounded; the control circuit includes a main control chip U1, a resistor R4, a resistor R5, a resistor R10, Resistor R22, resistor R23, resistor R25, resistor R30, resistor R31, resistor R35, capacitor C3, capacitor C8 and capacitor C9, after resistor R30 and resistor R31 are connected in parallel, connect resistor R23 and resistor R22 at both ends, and both ends of resistor R22 Connect the resistor R31 and the terminal 3 of the photocoupler U2 respectively, the common terminal of the resistor R30, the resistor R31 and the resistor R22 is grounded, one end of the resistor R23 is connected to the pin 4 of the main control chip U1, and the other end is connected to the resistor R30, the resistor R31 and the field The common terminal of the source of the effect tube Q1, one end of the capacitor C3 is connected to the pin 4 of the main control chip U1, and the other end is grounded. After the resistor R10 is connected in parallel with the capacitor C9, one end is connected to the resistor R25, and the other end is connected to the pin 2 of the main control chip U1. The two ends of the resistor R25 are respectively connected to the resistor R10 and the terminal 3 of the photocoupler U2. After the resistor R11 is connected in parallel with the capacitor C8, one end is connected to the pin 3 of the main control chip U1, and the other end is grounded. After the resistor R5 is connected in series with the resistor R4, the resistor R5 is connected to the same-named terminal 1 of the transformer T1, the resistor R4 is connected to the pin 3 of the main control chip U1, and the two ends of the resistor R35 are respectively connected to the non-identical terminal 5 of the primary side of the transformer T1 and the main control chip U1 pin 5, and the main control chip U1 pin 6 is grounded, and pin 7 of the main control chip U1 is connected to resistor R34.
根据本发明的实施例，所述恒流恒压输出端调光控制电路包括运算放大器U3A、运算放大器U3B、运算放大器U3C、运算放大器U3D、齐纳二极管U4、齐纳二极管ZD1、齐纳二极管D11、二极管D2、二极管D9、电阻R5、电阻R6、电阻R8、电阻R13、电阻R15、电阻R17、电阻R20、电阻R28、电阻R29、电阻R36、电阻R39、电阻R41、电阻R42、电阻R43、电阻R44、电阻R45、电阻R46、电阻R47、电阻R51、电阻R52、电阻R54、电容C10、电容C11、电容C12、电容C13、电容C14、电容C15；According to an embodiment of the present invention, the constant current and constant voltage output terminal dimming control circuit includes an operational amplifier U3A, an operational amplifier U3B, an operational amplifier U3C, an operational amplifier U3D, a Zener diode U4, a Zener diode ZD1, and a Zener diode D11 , diode D2, diode D9, resistor R5, resistor R6, resistor R8, resistor R13, resistor R15, resistor R17, resistor R20, resistor R28, resistor R29, resistor R36, resistor R39, resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R51, resistor R52, resistor R54, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15;
电容C13与齐纳二极管U4并联后，齐纳二极管U4的负极连接电阻R15的一端和电阻R52的一端以及运算放大器U3C的同相输入端，齐纳二极管U4的正极接地，电阻R52的另一端连接运算放大器U3D的正电源电压输入端，电阻R15的另一端连接运算放大器U3D的同相输入端，运算放大器U3D的负电源电压输入端接地，电阻R20和电阻R17串联后，电阻R20连接运算放大器U3D的反相输入端，电阻R17连接齐纳二极管ZD1的负极，齐纳二极管ZD1的正极接地，运算放大器U3D的输出端连接电阻R20与电阻R17的共极端，电阻R13的一端连接运算放大器U3D的反相输入端，电阻R13的另一端接地，电容C10的一端连接运算放大器U3D的正电源电压输入端，电容C10的另一端接地，电阻R29的一端连接运算放大器U3D的同相输入端，电阻R29的另一端连接齐纳二极管ZD1的负极，电阻R39和电阻R46串联后，电阻R39连接齐纳二极管D11的负极和运算放大器U3A的同相输入端，电阻R46连接齐纳二极管ZD1的负极，齐纳二极管D11的正极接地，电阻R28的一端连接电阻R39与电阻R46的共极端，电阻R28的另一端连接输出端子4，电容C15的一端连接运算放大器U3A的同相输入端，电容C15的另一端接地，运算放大器U3A的反相输入端与运算放大器U3A的输出端连接，电阻R8的一端连接运算放大器U3A的反相输入端，电阻R8的另一端连接运算放大器U3B的同相输入端，电阻R41和电阻R42串联后，一端接地，另一端连接运算放大器U3B的同相输入端，电容C10与电阻R43串联后，电容C10连接运算放大器U3B的输出端，电阻R43连接运算放大器U3B的反相输入端，电容C14与电阻R51并联后，一端连接运算放大器U3B的反相输入端，另一端接地，二极管D2的负极连接运算放大器U3B的输出端，二极管D2的正极连接光电耦合器接线端2，二极管D9的正极连接二极管D2的正极，二极管D9的负极连接运算放大器U3C的输出端，电阻R44与电容C11串联后，电阻R44连接运算放大器U3C的输出端，电容C11连接运算放大器U3C的反相输入端，电阻R36与电阻R47以及电阻R45串联后，电阻R36连接互感器LF3的第一接线端，电阻R45接地，电阻R47与电阻R45的共极端连接运算放大器U3C的反相输入端。After the capacitor C13 is connected in parallel with the Zener diode U4, the negative pole of the Zener diode U4 is connected to one end of the resistor R15, one end of the resistor R52 and the non-inverting input end of the operational amplifier U3C, the positive pole of the Zener diode U4 is grounded, and the other end of the resistor R52 is connected to the operational amplifier. The positive supply voltage input terminal of the amplifier U3D, the other end of the resistor R15 is connected to the non-inverting input terminal of the operational amplifier U3D, and the negative supply voltage input terminal of the operational amplifier U3D is grounded. At the phase input terminal, the resistor R17 is connected to the negative pole of the Zener diode ZD1, and the positive pole of the Zener diode ZD1 is grounded, the output terminal of the operational amplifier U3D is connected to the common terminal of the resistor R20 and the resistor R17, and one end of the resistor R13 is connected to the inverting input of the operational amplifier U3D terminal, the other end of the resistor R13 is grounded, one end of the capacitor C10 is connected to the positive supply voltage input terminal of the operational amplifier U3D, the other end of the capacitor C10 is grounded, one end of the resistor R29 is connected to the non-inverting input terminal of the operational amplifier U3D, and the other end of the resistor R29 is connected to The negative pole of the Zener diode ZD1, resistor R39 and resistor R46 are connected in series, the resistor R39 is connected to the negative pole of the Zener diode D11 and the non-inverting input terminal of the operational amplifier U3A, the resistor R46 is connected to the negative pole of the Zener diode ZD1, and the positive pole of the Zener diode D11 is grounded , one end of the resistor R28 is connected to the common terminal of the resistor R39 and the resistor R46, the other end of the resistor R28 is connected to the output terminal 4, one end of the capacitor C15 is connected to the non-inverting input terminal of the operational amplifier U3A, the other end of the capacitor C15 is grounded, and the reverse terminal of the operational amplifier U3A The phase input terminal is connected to the output terminal of the operational amplifier U3A, one end of the resistor R8 is connected to the inverting input terminal of the operational amplifier U3A, the other end of the resistor R8 is connected to the non-inverting input terminal of the operational amplifier U3B, after the resistor R41 and the resistor R42 are connected in series, one end is grounded , the other end is connected to the non-inverting input terminal of the operational amplifier U3B. After the capacitor C10 is connected in series with the resistor R43, the capacitor C10 is connected to the output terminal of the operational amplifier U3B, and the resistor R43 is connected to the inverting input terminal of the operational amplifier U3B. After the capacitor C14 is connected in parallel with the resistor R51, One end is connected to the inverting input terminal of the operational amplifier U3B, the other end is grounded, the cathode of the diode D2 is connected to the output terminal of the operational amplifier U3B, the anode of the diode D2 is connected to the terminal 2 of the optocoupler, the anode of the diode D9 is connected to the anode of the diode D2, and the diode The negative pole of D9 is connected to the output terminal of the operational amplifier U3C. After the resistor R44 is connected in series with the capacitor C11, the resistor R44 is connected to the output terminal of the operational amplifier U3C, and the capacitor C11 is connected to the inverting input terminal of the operational amplifier U3C. The resistor R36 is connected in series with the resistor R47 and the resistor R45. Finally, the resistor R36 is connected to the first terminal of the transformer LF3, the resistor R45 is grounded, and the common terminal of the resistor R47 and the resistor R45 is connected to the inverting input terminal of the operational amplifier U3C.
根据本发明的实施例，所述高频变压切换电路包括变压器T1、三极管Q1、电阻R9、电阻R21、电阻R24、电阻R37、电阻R38、有极性电容C6、电容C17、有极性电容C61、二极管D4、齐纳二极管D5、二极管D10；According to an embodiment of the present invention, the high-frequency variable voltage switching circuit includes a transformer T1, a transistor Q1, a resistor R9, a resistor R21, a resistor R24, a resistor R37, a resistor R38, a polarized capacitor C6, a capacitor C17, and a polarized capacitor C61, diode D4, Zener diode D5, diode D10;
电阻R37和电阻R38以及电容C17并联后，一端连接变压器T1一次侧同名端1，另一端连接二极管D10的负极，电阻R21的两端分别连接D10的正极和变压器T1一次侧非同名端3，电阻R24的两端分别连接光电耦合器U2的接线端1和三极管Q1的发射极，有极性电容C6的正极连接三极管Q1的发射极，有极性电容C6的负极接地，齐纳二极管D5的负极连接三极管Q1的基极，齐纳二极管D5的正极接地，电阻R9的两端分别连接三极管Q1的基极和集电极，有极性电容C61的正极连接三极管Q1的集电极，有极性电容C61的负极接地，二极管D4的负极连接三极管Q1的集电极，二极管D4的正极连接变压器T1二次侧非同名端6。After resistor R37, resistor R38 and capacitor C17 are connected in parallel, one end is connected to the same-named terminal 1 of the primary side of transformer T1, and the other end is connected to the negative pole of diode D10. The two ends of R24 are respectively connected to the terminal 1 of the photocoupler U2 and the emitter of the triode Q1, the positive pole of the polarized capacitor C6 is connected to the emitter of the triode Q1, the negative pole of the polarized capacitor C6 is grounded, and the negative pole of the Zener diode D5 Connect the base of the transistor Q1, the anode of the zener diode D5 is grounded, the two ends of the resistor R9 are respectively connected to the base and collector of the transistor Q1, the positive electrode of the polarized capacitor C61 is connected to the collector of the transistor Q1, and the polarized capacitor C61 The cathode of the diode D4 is connected to the ground, the cathode of the diode D4 is connected to the collector of the transistor Q1, and the anode of the diode D4 is connected to the non-identical terminal 6 of the secondary side of the transformer T1.
根据本发明的实施例，所述输入整流滤波电路包括整流桥DB1、熔断器F1、压敏电阻VDR1、互感器LF1、互感器LF2、电阻R12、电阻R14、电阻R16、电阻R19、电感L1、电感L2、电容C1、电容C2；According to an embodiment of the present invention, the input rectification filter circuit includes a rectifier bridge DB1, a fuse F1, a piezoresistor VDR1, a transformer LF1, a transformer LF2, a resistor R12, a resistor R14, a resistor R16, a resistor R19, an inductor L1, Inductor L2, capacitor C1, capacitor C2;
熔断器F1的一端连接交流输入端，另一端连接互感器LF1的第一接线端，压敏电阻VDR1的两端分别连接互感器LF1的第一接线端和第二接线端，电阻R16与电感L1并联后一端连接电阻R19的一端，另一端连接互感器LF2的第一接线端，电阻R19的另一端连接互感器LF1的第三接线端，电阻R12与电感L1并联后一端连接电阻R14的一端，另一端连接互感器LF2的第二接线端，电阻R14的另一端连接互感器LF1的第四接线端，电容C1的两端分别连接互感器LF2的第一接线端和第二接线端，电阻R2与电阻R3串联后，电阻R2连接互感器LF2的第一接线端，电阻R3连接互感器LF2的第二接线端，整流桥DB1的接线端3连接互感器LF2的第三接线端，整流桥DB1的接线端1连接互感器LF2的第四接线端，整流桥DB1的接线端4接地，整流桥DB1的接线端2连接变压器T1一次侧同名端1，电容C2的一端连接变压器T1一次侧同名端1，另一端接地。One end of the fuse F1 is connected to the AC input terminal, the other end is connected to the first terminal of the transformer LF1, the two ends of the varistor VDR1 are respectively connected to the first terminal and the second terminal of the transformer LF1, the resistor R16 and the inductor L1 After parallel connection, one end is connected to one end of the resistor R19, the other end is connected to the first terminal of the transformer LF2, the other end of the resistor R19 is connected to the third terminal of the transformer LF1, and the resistor R12 is connected in parallel with the inductor L1. One end is connected to one end of the resistor R14. The other end is connected to the second terminal of the transformer LF2, the other end of the resistor R14 is connected to the fourth terminal of the transformer LF1, the two ends of the capacitor C1 are respectively connected to the first terminal and the second terminal of the transformer LF2, and the resistor R2 After being connected in series with the resistor R3, the resistor R2 is connected to the first terminal of the transformer LF2, the resistor R3 is connected to the second terminal of the transformer LF2, the terminal 3 of the rectifier bridge DB1 is connected to the third terminal of the transformer LF2, and the rectifier bridge DB1 The terminal 1 of the rectifier bridge DB1 is connected to the fourth terminal of the transformer LF2, the terminal 4 of the rectifier bridge DB1 is grounded, the terminal 2 of the rectifier bridge DB1 is connected to the same-named terminal 1 of the primary side of the transformer T1, and one end of the capacitor C2 is connected to the same-named terminal of the primary side of the transformer T1 1, the other end is grounded.
根据本发明的实施例，所述输出整流滤波电路包括互感器LF3、二极管D6、二极管D7、有极性电容C7、有极性电容C16、电阻R6、电阻R48、电阻R49、电阻R53、电阻R54；According to an embodiment of the present invention, the output rectification filter circuit includes a transformer LF3, a diode D6, a diode D7, a polarized capacitor C7, a polarized capacitor C16, a resistor R6, a resistor R48, a resistor R49, a resistor R53, and a resistor R54 ;
电阻R6与电阻R54并联后，一端连接互感器LF3的第二接线端，另一端接地，电阻R53的一端连接互感器LF3的第二接线端，另一端连接有极性电容C16的正极，有极性电容C16的负极接地，有极性电容C7的正极连接有极性电容C16的正极，有极性电容C7的负极连接互感器LF3的第二接线端，电阻R48与电阻R49串联后，电阻R49连接互感器LF3的第一接线端，电阻R48连接变压器T1二次侧非同名端9，二极管D6与二极管D7同向并联后，正极连接变压器T1二次侧非同名端9，负极连接互感器LF3的第二接线端，互感器LF3的第三接线端连接输出端子1，互感器LF3的第四接线端，连接输出端子2。After the resistor R6 and the resistor R54 are connected in parallel, one end is connected to the second terminal of the transformer LF3, and the other end is grounded. One end of the resistor R53 is connected to the second terminal of the transformer LF3, and the other end is connected to the positive pole of the polarized capacitor C16. The negative pole of the polarized capacitor C16 is grounded, the positive pole of the polarized capacitor C7 is connected to the positive pole of the polarized capacitor C16, the negative pole of the polarized capacitor C7 is connected to the second terminal of the transformer LF3, after the resistor R48 is connected in series with the resistor R49, the resistor R49 Connect the first terminal of the transformer LF3, the resistor R48 is connected to the non-identical terminal 9 of the secondary side of the transformer T1, and after the diode D6 and the diode D7 are connected in parallel in the same direction, the anode is connected to the non-identical terminal 9 of the secondary side of the transformer T1, and the negative terminal is connected to the transformer LF3 The second terminal of the transformer LF3 is connected to the output terminal 1, and the fourth terminal of the transformer LF3 is connected to the output terminal 2.
实施本发明的技术方案，具有以下有益效果：本发明多模式调光电源电路既可以在输入端进行LED调光，也可以在输出端进行LED调光，完全改变现有技术的单模式调光方法，极大提高了LED调光的便利性。The implementation of the technical solution of the present invention has the following beneficial effects: the multi-mode dimming power supply circuit of the present invention can perform LED dimming at the input end, and can also perform LED dimming at the output end, completely changing the single-mode dimming of the prior art The method greatly improves the convenience of LED dimming.
附图说明Description of drawings
下面通过参考附图并结合实例具体地描述本发明，本发明的优点和实现方式将会更加明显，其中附图所示内容仅用于对本发明的解释说明，而不构成对本发明的任何意义上的限制，在附图中：The advantages and implementation methods of the present invention will be more obvious by referring to the accompanying drawings and describing the present invention in conjunction with examples below, wherein the content shown in the accompanying drawings is only used for explaining the present invention, and does not constitute any sense of the present invention The constraints, in the attached image:
图1为本发明多模式调光电源电路模块图；Fig. 1 is a block diagram of the multi-mode dimming power supply circuit of the present invention;
图2为本发明多模式调光电源电路图。Fig. 2 is a circuit diagram of the multi-mode dimming power supply of the present invention.
具体实施方式detailed description
如图1和图2所示，本发明多模式调光电源电路包括依次相连的输入整流滤波电路、高频变压切换电路、输出整流滤波电路、恒流恒压输出端调光控制电路，还包括调光控制电路，调光控制电路分别连接输入整流滤波电路和高频变压切换电路，其中调光控制电路包括依次相连的偏置供电电路和控制电路，偏置供电电路包括三极管Q2、齐纳二极管D1、电阻R7、电阻R27、电阻R26、有极性电容C18、有极性电容C4、二极管D3和电阻R18，齐纳二极管D1的负极连接三极管Q2的基极，齐纳二极管D1的正极接地，有极性电容C4的正极连接二极管D3的负极，有极性电容C4的负极接地，电阻R18的一端连接二极管D3的正极，另一端连接变压器T1一次侧非同名端5，电阻R7的一端连接齐纳二极管D1的负极，另一端连接有极性电容C4的正极，电阻R27和电阻R26串联后，电阻R26连接三极管Q2的发射极，电阻R27连接变压器T1一次侧同名端1，有极性电容C18的正极连接三极管Q2的发射极和光电耦合器U2的接线端4，有极性电容C18的负极接地；控制电路包括主控芯片U1、电阻R4、电阻R5、电阻R10、电阻R22、电阻R23、电阻R25、电阻R30、电阻R31、电阻R35、电容C3、电容C8和电容C9，电阻R30和电阻R31并联后，两端分别连接电阻R23和电阻R22，电阻R22的两端分别连接电阻R31和光电耦合器U2的接线端3，电阻R30、电阻R31和电阻R22的共极端接地，电阻R23的一端连接主控芯片U1管脚4，另一端连接电阻R30、电阻R31以及场效应管Q1源极的共极端，电容C3的一端连接主控芯片U1管脚4，另一端接地，电阻R10与电容C9并联后，一端连接电阻R25，另一端连接主控芯片U1管脚2，电阻R25的两端分别连接电阻R10和光电耦合器U2的接线端3，电阻R11与电容C8并联后，一端连接主控芯片U1管脚3，另一端接地，电阻R5与电阻R4串联后，电阻R5连接变压器T1的同名端1，电阻R4连接主控芯片U1管脚3，电阻R35的两端分别连接变压器T1一次侧非同名端5和主控芯片U1管脚5，主控芯片U1管脚6接地，主控芯片U1管脚7连接电阻R34。恒流恒压输出端调光控制电路包括运算放大器U3A、运算放大器U3B、运算放大器U3C、运算放大器U3D、齐纳二极管U4、齐纳二极管ZD1、齐纳二极管D11、二极管D2、二极管D9、电阻R5、电阻R6、电阻R8、电阻R13、电阻R15、电阻R17、电阻R20、电阻R28、电阻R29、电阻R36、电阻R39、电阻R41、电阻R42、电阻R43、电阻R44、电阻R45、电阻R46、电阻R47、电阻R51、电阻R52、电阻R54、电容C10、电容C11、电容C12、电容C13、电容C14、电容C15；电容C13与齐纳二极管U4并联后，齐纳二极管U4的负极连接电阻R15的一端和电阻R52的一端以及运算放大器U3C的同相输入端，齐纳二极管U4的正极接地，电阻R52的另一端连接运算放大器U3D的正电源电压输入端，电阻R15的另一端连接运算放大器U3D的同相输入端，运算放大器U3D的负电源电压输入端接地，电阻R20和电阻R17串联后，电阻R20连接运算放大器U3D的反相输入端，电阻R17连接齐纳二极管ZD1的负极，齐纳二极管ZD1的正极接地，运算放大器U3D的输出端连接电阻R20与电阻R17的共极端，电阻R13的一端连接运算放大器U3D的反相输入端，电阻R13的另一端接地，电容C10的一端连接运算放大器U3D的正电源电压输入端，电容C10的另一端接地，电阻R29的一端连接运算放大器U3D的同相输入端，电阻R29的另一端连接齐纳二极管ZD1的负极，电阻R39和电阻R46串联后，电阻R39连接齐纳二极管D11的负极和运算放大器U3A的同相输入端，电阻R46连接齐纳二极管ZD1的负极，齐纳二极管D11的正极接地，电阻R28的一端连接电阻R39与电阻R46的共极端，电阻R28的另一端连接输出端子4，电容C15的一端连接运算放大器U3A的同相输入端，电容C15的另一端接地，运算放大器U3A的反相输入端与运算放大器U3A的输出端连接，电阻R8的一端连接运算放大器U3A的反相输入端，电阻R8的另一端连接运算放大器U3B的同相输入端，电阻R41和电阻R42串联后，一端接地，另一端连接运算放大器U3B的同相输入端，电容C10与电阻R43串联后，电容C10连接运算放大器U3B的输出端，电阻R43连接运算放大器U3B的反相输入端，电容C14与电阻R51并联后，一端连接运算放大器U3B的反相输入端，另一端接地，二极管D2的负极连接运算放大器U3B的输出端，二极管D2的正极连接光电耦合器接线端2，二极管D9的正极连接二极管D2的正极，二极管D9的负极连接运算放大器U3C的输出端，电阻R44与电容C11串联后，电阻R44连接运算放大器U3C的输出端，电容C11连接运算放大器U3C的反相输入端，电阻R36与电阻R47以及电阻R45串联后，电阻R36连接互感器LF3的第一接线端，电阻R45接地，电阻R47与电阻R45的共极端连接运算放大器U3C的反相输入端。高频变压切换电路包括变压器T1、三极管Q1、电阻R9、电阻R21、电阻R24、电阻R37、电阻R38、有极性电容C6、电容C17、有极性电容C61、二极管D4、齐纳二极管D5、二极管D10；电阻R37和电阻R38以及电容C17并联后，一端连接变压器T1一次侧同名端1，另一端连接二极管D10的负极，电阻R21的两端分别连接D10的正极和变压器T1一次侧非同名端3，电阻R24的两端分别连接光电耦合器U2的接线端1和三极管Q1的发射极，有极性电容C6的正极连接三极管Q1的发射极，有极性电容C6的负极接地，齐纳二极管D5的负极连接三极管Q1的基极，齐纳二极管D5的正极接地，电阻R9的两端分别连接三极管Q1的基极和集电极，有极性电容C61的正极连接三极管Q1的集电极，有极性电容C61的负极接地，二极管D4的负极连接三极管Q1的集电极，二极管D4的正极连接变压器T1二次侧非同名端6。根据本发明的实施例，输入整流滤波电路包括整流桥DB1、熔断器F1、压敏电阻VDR1、互感器LF1、互感器LF2、电阻R12、电阻R14、电阻R16、电阻R19、电感L1、电感L2、电容C1、电容C2；熔断器F1的一端连接交流输入端，另一端连接互感器LF1的第一接线端，压敏电阻VDR1的两端分别连接互感器LF1的第一接线端和第二接线端，电阻R16与电感L1并联后一端连接电阻R19的一端，另一端连接互感器LF2的第一接线端，电阻R19的另一端连接互感器LF1的第三接线端，电阻R12与电感L1并联后一端连接电阻R14的一端，另一端连接互感器LF2的第二接线端，电阻R14的另一端连接互感器LF1的第四接线端，电容C1的两端分别连接互感器LF2的第一接线端和第二接线端，电阻R2与电阻R3串联后，电阻R2连接互感器LF2的第一接线端，电阻R3连接互感器LF2的第二接线端，整流桥DB1的接线端3连接互感器LF2的第三接线端，整流桥DB1的接线端1连接互感器LF2的第四接线端，整流桥DB1的接线端4接地，整流桥DB1的接线端2连接变压器T1一次侧同名端1，电容C2的一端连接变压器T1一次侧同名端1，另一端接地。输出整流滤波电路包括互感器LF3、二极管D6、二极管D7、有极性电容C7、有极性电容C16、电阻R6、电阻R48、电阻R49、电阻R53、电阻R54；电阻R6与电阻R54并联后，一端连接互感器LF3的第二接线端，另一端接地，电阻R53的一端连接互感器LF3的第二接线端，另一端连接有极性电容C16的正极，有极性电容C16的负极接地，有极性电容C7的正极连接有极性电容C16的正极，有极性电容C7的负极连接互感器LF3的第二接线端，电阻R48与电阻R49串联后，电阻R49连接互感器LF3的第一接线端，电阻R48连接变压器T1二次侧非同名端9，二极管D6与二极管D7同向并联后，正极连接变压器T1二次侧非同名端9，负极连接互感器LF3的第二接线端，互感器LF3的第三接线端连接输出端子1，互感器LF3的第四接线端，连接输出端子2。As shown in Figure 1 and Figure 2, the multi-mode dimming power supply circuit of the present invention includes an input rectifying and filtering circuit, a high-frequency transformer switching circuit, an output rectifying and filtering circuit, a constant current and constant voltage output end dimming control circuit connected in sequence, and It includes a dimming control circuit, which is respectively connected to an input rectification filter circuit and a high-frequency transformer switching circuit, wherein the dimming control circuit includes a bias power supply circuit and a control circuit connected in sequence, and the bias power supply circuit includes a triode Q2, a Qi Nano diode D1, resistor R7, resistor R27, resistor R26, polarized capacitor C18, polarized capacitor C4, diode D3 and resistor R18, the negative pole of Zener diode D1 is connected to the base of transistor Q2, and the positive pole of Zener diode D1 Grounding, the positive pole of the polarized capacitor C4 is connected to the negative pole of the diode D3, the negative pole of the polarized capacitor C4 is grounded, one end of the resistor R18 is connected to the positive pole of the diode D3, the other end is connected to the non-identical terminal 5 of the primary side of the transformer T1, and one end of the resistor R7 Connect the negative pole of the zener diode D1, and the other end is connected to the positive pole of the polarized capacitor C4. After the resistor R27 and the resistor R26 are connected in series, the resistor R26 is connected to the emitter of the triode Q2, and the resistor R27 is connected to the same-named terminal 1 of the primary side of the transformer T1, which has polarity The anode of the capacitor C18 is connected to the emitter of the transistor Q2 and the terminal 4 of the photocoupler U2, and the negative electrode of the polarized capacitor C18 is grounded; the control circuit includes the main control chip U1, resistor R4, resistor R5, resistor R10, resistor R22, resistor R23, resistor R25, resistor R30, resistor R31, resistor R35, capacitor C3, capacitor C8 and capacitor C9, after resistor R30 and resistor R31 are connected in parallel, connect resistor R23 and resistor R22 at both ends, and connect resistor R31 at both ends of resistor R22 and the terminal 3 of the photocoupler U2, the common terminal of the resistor R30, the resistor R31 and the resistor R22 are grounded, one end of the resistor R23 is connected to the pin 4 of the main control chip U1, and the other end is connected to the resistor R30, the resistor R31 and the source of the field effect transistor Q1 One end of the capacitor C3 is connected to the pin 4 of the main control chip U1, and the other end is grounded. After the resistor R10 is connected in parallel with the capacitor C9, one end is connected to the resistor R25, and the other end is connected to the pin 2 of the main control chip U1. The two ends of the resistor R25 The terminals are respectively connected to the resistor R10 and the terminal 3 of the photocoupler U2. After the resistor R11 is connected in parallel with the capacitor C8, one end is connected to the pin 3 of the main control chip U1, and the other end is grounded. After the resistor R5 is connected in series with the resistor R4, the resistor R5 is connected to the transformer T1. terminal 1 of the same name of the main control chip, resistor R4 is connected to the pin 3 of the main control chip U1, the two ends of the resistor R35 are respectively connected to the non-identical terminal 5 of the primary side of the transformer T1 and the pin 5 of the main control chip U1, the pin 6 of the main control chip U1 is grounded, and the main control chip U1 pin 6 is grounded. The control chip U1 pin 7 is connected to the resistor R34. Constant current and constant voltage output dimming control circuit includes operational amplifier U3A, operational amplifier U3B, operational amplifier U3C, operational amplifier U3D, Zener diode U4, Zener diode ZD1, Zener diode D11, diode D2, diode D9, resistor R5 , resistor R6, resistor R8, resistor R13, resistor R15, resistor R17, resistor R20, resistor R28, resistor R29, resistor R36, resistor R39, resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R51, resistor R52, resistor R54, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15; after capacitor C13 is connected in parallel with Zener diode U4, the cathode of Zener diode U4 is connected to one end of resistor R15 And one end of the resistor R52 and the non-inverting input of the operational amplifier U3C, the anode of the Zener diode U4 is grounded, the other end of the resistor R52 is connected to the positive power supply voltage input of the operational amplifier U3D, and the other end of the resistor R15 is connected to the non-inverting input of the operational amplifier U3D terminal, the negative supply voltage input terminal of the operational amplifier U3D is grounded, and after the resistor R20 and the resistor R17 are connected in series, the resistor R20 is connected to the inverting input terminal of the operational amplifier U3D, the resistor R17 is connected to the negative pole of the Zener diode ZD1, and the positive pole of the Zener diode ZD1 is grounded , the output end of the operational amplifier U3D is connected to the common terminal of the resistor R20 and the resistor R17, one end of the resistor R13 is connected to the inverting input end of the operational amplifier U3D, the other end of the resistor R13 is grounded, and one end of the capacitor C10 is connected to the positive power supply voltage of the operational amplifier U3D At the input terminal, the other end of the capacitor C10 is grounded, one end of the resistor R29 is connected to the non-inverting input terminal of the operational amplifier U3D, the other end of the resistor R29 is connected to the negative pole of the Zener diode ZD1, and after the resistor R39 and the resistor R46 are connected in series, the resistor R39 is connected to the Zener diode The negative pole of D11 is connected to the non-inverting input terminal of operational amplifier U3A, the resistor R46 is connected to the negative pole of Zener diode ZD1, the positive pole of Zener diode D11 is grounded, one end of resistor R28 is connected to the common terminal of resistor R39 and resistor R46, and the other end of resistor R28 is connected to Output terminal 4, one end of the capacitor C15 is connected to the non-inverting input of the operational amplifier U3A, the other end of the capacitor C15 is grounded, the inverting input of the operational amplifier U3A is connected to the output of the operational amplifier U3A, and one end of the resistor R8 is connected to the terminal of the operational amplifier U3A The inverting input terminal, the other end of the resistor R8 is connected to the non-inverting input terminal of the operational amplifier U3B. After the resistor R41 and the resistor R42 are connected in series, one end is connected to the ground, and the other end is connected to the non-inverting input terminal of the operational amplifier U3B. After the capacitor C10 is connected in series with the resistor R43, the capacitor C10 is connected to the output terminal of operational amplifier U3B, resistor R43 is connected to the inverting input terminal of operational amplifier U3B, after capacitor C14 is connected in parallel with resistor R51, one end is connected to the inverting input terminal of operational amplifier U3B, and the other end is connected to ground, the cathode of the diode D2 is connected to the output terminal of the operational amplifier U3B, the anode of the diode D2 is connected to the terminal 2 of the photocoupler, the anode of the diode D9 is connected to the anode of the diode D2, the cathode of the diode D9 is connected to the output terminal of the operational amplifier U3C, and the resistor R44 After being connected in series with capacitor C11, resistor R44 is connected to the output terminal of operational amplifier U3C, capacitor C11 is connected to the inverting input terminal of operational amplifier U3C, after resistor R36 is connected in series with resistor R47 and resistor R45, resistor R36 is connected to the first terminal of transformer LF3 , the resistor R45 is grounded, and the common terminal of the resistor R47 and the resistor R45 is connected to the inverting input terminal of the operational amplifier U3C. High-frequency variable voltage switching circuit includes transformer T1, transistor Q1, resistor R9, resistor R21, resistor R24, resistor R37, resistor R38, polarized capacitor C6, capacitor C17, polarized capacitor C61, diode D4, Zener diode D5 , Diode D10; after resistor R37, resistor R38 and capacitor C17 are connected in parallel, one end is connected to terminal 1 of the primary side of transformer T1 with the same name, the other end is connected to the negative pole of diode D10, and the two ends of resistor R21 are respectively connected to the positive pole of D10 and the primary side of transformer T1 with the same name Terminal 3, the two ends of the resistor R24 are respectively connected to the terminal 1 of the photocoupler U2 and the emitter of the transistor Q1, the positive electrode of the polarized capacitor C6 is connected to the emitter of the transistor Q1, and the negative electrode of the polarized capacitor C6 is grounded, Zener The cathode of the diode D5 is connected to the base of the transistor Q1, the anode of the zener diode D5 is grounded, the two ends of the resistor R9 are respectively connected to the base and the collector of the transistor Q1, and the positive electrode of the polarized capacitor C61 is connected to the collector of the transistor Q1. The negative pole of the polarity capacitor C61 is grounded, the negative pole of the diode D4 is connected to the collector of the transistor Q1, and the positive pole of the diode D4 is connected to the non-identical terminal 6 of the secondary side of the transformer T1. According to an embodiment of the present invention, the input rectification filter circuit includes a rectifier bridge DB1, a fuse F1, a piezoresistor VDR1, a transformer LF1, a transformer LF2, a resistor R12, a resistor R14, a resistor R16, a resistor R19, an inductor L1, and an inductor L2 , capacitor C1, and capacitor C2; one end of the fuse F1 is connected to the AC input end, the other end is connected to the first terminal of the transformer LF1, and the two ends of the varistor VDR1 are respectively connected to the first terminal and the second terminal of the transformer LF1 terminal, resistor R16 is connected in parallel with inductance L1, one end is connected to one end of resistor R19, the other end is connected to the first terminal of transformer LF2, the other end of resistor R19 is connected to the third terminal of transformer LF1, after resistor R12 is connected in parallel with inductor L1 One end is connected to one end of the resistor R14, the other end is connected to the second terminal of the transformer LF2, the other end of the resistor R14 is connected to the fourth terminal of the transformer LF1, and the two ends of the capacitor C1 are respectively connected to the first terminal of the transformer LF2 and The second terminal, after resistor R2 and resistor R3 are connected in series, resistor R2 is connected to the first terminal of transformer LF2, resistor R3 is connected to the second terminal of transformer LF2, terminal 3 of rectifier bridge DB1 is connected to the first terminal of transformer LF2 Three terminals, terminal 1 of the rectifier bridge DB1 is connected to the fourth terminal of the transformer LF2, terminal 4 of the rectifier bridge DB1 is grounded, terminal 2 of the rectifier bridge DB1 is connected to the primary side of the transformer T1 with the same name terminal 1, and one end of the capacitor C2 Connect the primary side of the transformer T1 with the same name as terminal 1, and the other terminal is grounded. The output rectification filter circuit includes transformer LF3, diode D6, diode D7, polarized capacitor C7, polarized capacitor C16, resistor R6, resistor R48, resistor R49, resistor R53, resistor R54; after resistor R6 and resistor R54 are connected in parallel, One end is connected to the second terminal of the transformer LF3, the other end is grounded, one end of the resistor R53 is connected to the second terminal of the transformer LF3, the other end is connected to the positive pole of the polarized capacitor C16, and the negative pole of the polarized capacitor C16 is grounded. The positive pole of the polarized capacitor C7 is connected to the positive pole of the polarized capacitor C16, and the negative pole of the polarized capacitor C7 is connected to the second terminal of the transformer LF3. After the resistor R48 is connected in series with the resistor R49, the resistor R49 is connected to the first terminal of the transformer LF3. Resistor R48 is connected to the non-identical terminal 9 of the secondary side of the transformer T1, and after the diode D6 and diode D7 are connected in parallel in the same direction, the positive pole is connected to the non-identical terminal 9 of the secondary side of the transformer T1, and the negative pole is connected to the second terminal of the transformer LF3. The third terminal of LF3 is connected to output terminal 1, and the fourth terminal of transformer LF3 is connected to output terminal 2.
输入整流滤波电路包括F1、VDR1、LF1、R19、R14、L1、L2、R16、R12、C1、LF2、DB1、C2，其中R19、R14是阻尼电阻，避免电感与滤波电容产生震荡引起的闪烁。同时R19和R14不能太大或者太小，应当根据调光电源的瓦数大小去选择对应的阻值，C1的取值尽量使容量最少，但是又能起到消除电磁传导干扰的作用，折中选取的话C1的容量在47NF以内为最好。高频变压切换电路主要由高频变压器T1、开关三极管Q1组成，R37、R38、C17、D10、R21组成漏感尖峰吸收回路，可以为变压器T1消磁，吸收漏感尖峰，保护三极管Q1不被击穿。R27、R26、C18、Q2、D1、R7、C4、D3、R18构成偏置供电电路，同时也起到了假负载的作用。R7、D1、Q2构成串联稳压电路，调光到最暗时，电路负载很轻了，同时输出灯串的LED电压也较低，辅助供电的电压同灯串的电压是成正比的，为了较低的时候有足够的供电电压，所以辅助供电电压在全亮时非常高，超过了主控芯片U1 可以承受的供电电压，就需要这个串联稳压电路来降压到正常的工作电压，同时它在亮度调到最暗时可以起到假负载的作用来满足维持电流的需求。调光控制工作过程主要由主控芯片U1及其周围的阻容回路来实现。主控芯片U1可以选用临界模式的电流控制型PFC IC，例如ST L6562、FARICHILD 公司的FAN7527等等，调光器的信号通过输入整流回路得到一个电压幅度与其切相幅度相对应的信号，通过R27、R26、R11、C8 分压滤波进入到主控芯片U1管脚3，再通过主控芯片U1内部的乘法器和比较器确定U1 管脚4峰值电流的幅度，从而决定了电路的负载能力，通过调光器信号变化去改变LED电流输出负载电流，从而实现电流大小可调，即LED负载的亮度可变。输出整流滤波电路主要由D6、D7、C16、C7、LF3构成，R48和R49为二极管进行尖峰吸收。恒流控制由U3B、U3A、U3C、U3D、U4和其外围阻容元器件构成，U3B、U3A、U3C、U3D可以选用4通道的运算放大器，一般选用LM324，也可以选用温度系数较好的比较器。其中U3C、R36、R47、R45、R44、C11、D9构成了恒压控制电路，R36、R47、R45决定了输出电压大小，U3C的正相输入端的基准电压是2.5V，它是来自于U4（型号是TL431），它构成2.5V的基准稳压源，恒流控制由U3B、U3A、R6、R54、R51、C14、R41、R42、R8组成，R6和R54是电流调节电阻，R41和R42还有R8是基准电压设定电阻。可变电阻调光控制主要由U3D、ZD1、U3A，U3B完成，输出端子4接入的三种信号可以通过运放到达光耦U2，调控主控芯片U1，进行调光，这里的ZD1和D1必须选用10V 的稳压管， 如果输出端子4输入信号为0-10V 和可变电阻信号时，因为ZD1的负极电压被钳位到10V，所以0-10V信号可以通过R28、R39加到U3A的正相输入端，提供基准电压，如果是可变电阻时，ZD1的电压通过R46、R28与外接的可变电阻进行分压，通过R39送到U3A的正相输入端，给电流调节提供基准，从而实现可靠的调光。如果输出端子4输入信号为PWM方波，R39和C15组成了RC 积分器，就会在C15上得到一个同脉冲宽度成正比的直流电压，同时也会受限于D11的钳住最高10V电压，这个电压就会成为电流调节的基准电压，从而实现电流的改变。The input rectification and filtering circuit includes F1, VDR1, LF1, R19, R14, L1, L2, R16, R12, C1, LF2, DB1, and C2, among which R19 and R14 are damping resistors to avoid flicker caused by oscillation of the inductor and filter capacitor. At the same time, R19 and R14 should not be too large or too small. The corresponding resistance should be selected according to the wattage of the dimming power supply. The value of C1 should minimize the capacity, but it can also eliminate electromagnetic conduction interference. A compromise If selected, the capacity of C1 is best within 47NF. The high-frequency variable voltage switching circuit is mainly composed of a high-frequency transformer T1 and a switching transistor Q1. R37, R38, C17, D10, and R21 form a leakage inductance peak absorption circuit, which can degauss the transformer T1, absorb leakage inductance peaks, and protect the transistor Q1 from being breakdown. R27, R26, C18, Q2, D1, R7, C4, D3, R18 form a bias power supply circuit, and also act as a dummy load. R7, D1, and Q2 form a series voltage regulator circuit. When the light is dimmed to the darkest, the circuit load is very light, and the LED voltage of the output light string is also low. The voltage of the auxiliary power supply is proportional to the voltage of the light string. When it is low, there is sufficient power supply voltage, so the auxiliary power supply voltage is very high when it is fully bright, exceeding the power supply voltage that the main control chip U1 can withstand, so this series voltage regulator circuit is needed to reduce the voltage to the normal working voltage, and at the same time It can play the role of dummy load to meet the demand of maintaining current when the brightness is adjusted to the dimmest. The working process of dimming control is mainly realized by the main control chip U1 and the resistance-capacitance circuit around it. The main control chip U1 can use a critical mode current control PFC IC, such as ST L6562, FAN7527 of FARICHILD company, etc., the signal of the dimmer is input through the rectifier circuit to obtain a signal with a voltage amplitude corresponding to the phase cut amplitude, and through R27 , R26, R11, C8 The voltage divider filter enters the pin 3 of the main control chip U1, and then determines the amplitude of the peak current of the U1 pin 4 through the multiplier and comparator inside the main control chip U1, thus determining the load capacity of the circuit. Change the LED current output load current through the dimmer signal change, so as to realize the adjustable current, that is, the brightness of the LED load is variable. The output rectification filter circuit is mainly composed of D6, D7, C16, C7, LF3, R48 and R49 are diodes for peak absorption. The constant current control is composed of U3B, U3A, U3C, U3D, U4 and their peripheral resistance-capacitance components. U3B, U3A, U3C, and U3D can use 4-channel operational amplifiers. Generally, LM324 is used, or a relatively good temperature coefficient can be selected. device. Among them, U3C, R36, R47, R45, R44, C11, and D9 constitute a constant voltage control circuit, and R36, R47, and R45 determine the output voltage. The reference voltage of the positive phase input terminal of U3C is 2.5V, which comes from U4 ( The model is TL431), which constitutes a 2.5V reference voltage regulator, the constant current control is composed of U3B, U3A, R6, R54, R51, C14, R41, R42, R8, R6 and R54 are current adjustment resistors, R41 and R42 are also R8 is the reference voltage setting resistor. The variable resistor dimming control is mainly completed by U3D, ZD1, U3A, and U3B. The three signals connected to the output terminal 4 can reach the optocoupler U2 through the op amp, and adjust the main control chip U1 to perform dimming. Here, ZD1 and D1 A 10V Zener tube must be selected. If the input signal of output terminal 4 is 0-10V and variable resistance signal, because the negative voltage of ZD1 is clamped to 10V, the 0-10V signal can be added to U3A through R28 and R39. The positive-phase input terminal provides the reference voltage. If it is a variable resistor, the voltage of ZD1 is divided by R46, R28 and the external variable resistor, and sent to the positive-phase input terminal of U3A through R39 to provide a reference for current regulation. This enables reliable dimming. If the input signal of output terminal 4 is a PWM square wave, R39 and C15 form an RC integrator, a DC voltage proportional to the pulse width will be obtained on C15, and it will also be limited by D11 to clamp the maximum voltage of 10V. This voltage will become the reference voltage for current regulation, so as to realize the change of current.
本领域技术人员不脱离本发明的实质和精神，可以有多种变形方案实现本发明，以上所述仅为本发明较佳可行的实施例而已，并非因此局限本发明的权利范围，凡运用本发明说明书及附图内容所作的等效结构变化，均包含于本发明的权利范围之内。Those skilled in the art do not depart from the essence and spirit of the present invention, there can be many variants to realize the present invention, the above description is only a preferred and feasible embodiment of the present invention, and it does not limit the scope of rights of the present invention. The equivalent structural changes made in the description of the invention and the accompanying drawings are all included in the scope of rights of the present invention.
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| CN110572899A (en) * | 2019-08-21 | 2019-12-13 | 东莞华明灯具有限公司 | Light modulation circuit |
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| WO2012155801A1 (en) * | 2011-05-17 | 2012-11-22 | 广州南科集成电子有限公司 | Led lamp control circuit |
| CN102752932B (en) * | 2012-07-04 | 2014-10-29 | 宁波高新区赛尔富电子有限公司 | LED (light-emitting diode) dimming circuit |
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Address after: 523000 Daliantang Industrial Zone No. 3, Daliantang Community, Wanjiang District, Dongguan City, Guangdong Province Patentee after: Guangdong Collar Crown Intelligent Technology Co., Ltd. Address before: 523000 Daliantang Industrial Zone No. 3, Daliantang Community, Wanjiang District, Dongguan City, Guangdong Province Patentee before: Linkun (Dongguan) Semiconductor Lighting Co., Ltd. |