WO2018177389A1 - Led constant-voltage current-sharing system - Google Patents

Abstract

The present solution relates to the field of LEDs, and provides an LED constant-voltage current-sharing system. In the present solution, the system comprises a plurality of current-sharing modules, a plurality of direct-current power supplies, and an LED load module. The plurality of current-sharing modules is connected to the plurality of direct-current power supplies in one-to-one correspondence. Each current-sharing module detects an output voltage of corresponding direct-current power supply, and generates a balance voltage according to the output voltage. The plurality of balance voltages generated by the plurality of current-sharing modules is output to a current-sharing bus to generate a current-sharing bus voltage. Each current-sharing module generates a feedback signal according to the current-sharing bus voltage to adjust an output voltage of the corresponding direct-current power supply. Therefore, the current-sharing effect of a parallel power supply of the LED load module can be improved.

Description

LED constant voltage current sharing system Technical field

The invention belongs to the field of LEDs, and in particular relates to an LED constant voltage current sharing system.

Background technique

As the power of the LED load module increases, the requirements for the power supply current are increasing. The high-power LED system requires several or more power modules to supply power. All the power modules share the load, which requires the power module to be perfect. Stable current sharing circuit.

In the prior art, as shown in FIG. 1, the parallel power supply of the LED load module utilizes the load change rate of the power supply itself and the DC-blocking diode to achieve natural current sharing, without complicated current sharing circuit, and only needs to be outputted in each power module. Adding a DC blocking diode at the end can be achieved, but the current sharing effect is poor due to its own load change rate and the natural current sharing of the DC blocking diode.

Therefore, the prior art has no current sharing circuit, resulting in a problem of poor current sharing effect.

technical problem

The invention provides an LED constant voltage current sharing system, which aims to solve the problem that the prior art has no current sharing circuit, thereby causing poor current sharing effect.

Technical solution

The present invention is achieved by an LED constant voltage current sharing system including a plurality of current sharing modules, a plurality of DC power sources, and an LED load module;

The plurality of current sharing modules are connected to the plurality of DC power sources in a one-to-one correspondence, wherein the current sampling end and the feedback output end of each current sharing module are respectively connected to the sampling end and the feedback input end of the corresponding DC power supply. The equalization voltage ends of the plurality of current sharing modules are connected to the current sharing bus, and the positive output ends of the plurality of DC power sources are connected to the first end of the LED load module, and the negative output terminals of the plurality of DC power sources And the second end of the LED load module is connected to the power ground;

Each of the current sharing modules detects an output voltage of a corresponding DC power source, and generates an equalization voltage according to the output voltage, and the plurality of equalization voltages generated by the plurality of current sharing modules are output to the current sharing bus to generate A bus voltage, each current sharing module generating a feedback signal according to the current sharing bus voltage to adjust an output voltage of its corresponding DC power supply.

Beneficial effect

The technical solution provided by the present invention has the beneficial effects that, as can be seen from the above invention, the LED constant voltage current sharing system includes a plurality of current sharing modules, a plurality of DC power sources, and an LED load module; and a plurality of current sharing modules and a plurality of The DC power sources are connected one by one, each current sharing module detects the output voltage of the corresponding DC power source, and generates an equalized voltage according to the output voltage, and the plurality of equalized voltages generated by the plurality of current sharing modules are output to the current sharing bus to generate a current sharing. The bus voltage, each current sharing module generates a feedback signal according to the current sharing bus voltage to adjust the output voltage of the corresponding DC power supply, so that the current sharing effect of the parallel power supply of the LED load module can be improved.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a block diagram of a prior art LED constant voltage current sharing system;

2 is a block diagram of a module for constant voltage equalization of an LED according to an embodiment of the present invention;

3 is a schematic circuit structural diagram of a current sharing module of an LED constant voltage current sharing system according to an embodiment of the present invention;

4 is another schematic circuit structure diagram of a current sharing module for an LED constant voltage current sharing system according to an embodiment of the present invention;

5 is a block diagram of a current sharing module of an LED constant voltage current sharing system according to an embodiment of the present invention;

FIG. 6 is a schematic circuit structural diagram of the LED constant voltage current sharing system current sharing module provided in FIG. 5. FIG.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

FIG. 2 shows a module structure of an LED constant voltage current sharing system according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail as follows:

An LED constant voltage current sharing system includes a plurality of current sharing modules 01i, a plurality of DC power sources 02i, and an LED load module 03.

The current sharing module 01i is connected to the plurality of DC power sources 02i in one-to-one correspondence, wherein the current sampling end and the feedback output end of each current sharing module 01i are respectively connected to the sampling end and the feedback input end of the corresponding DC power supply 02i. The equalized voltage terminals of the plurality of current sharing modules 01i are connected to the current sharing bus, and the positive output terminals of the plurality of DC power sources 02i are connected to the first end of the LED load module, and the negative output terminals of the plurality of DC power sources 02i and the LED load The second end of the module is connected to the power ground.

Each current sharing module 01i detects an output voltage of the corresponding DC power source 02i, and generates an equalization voltage according to the output voltage. The plurality of equalization voltages generated by the plurality of current sharing modules 01i are output to the current sharing bus to generate a current sharing bus voltage. The current sharing module 01i generates a feedback signal according to the current sharing bus voltage to adjust the output voltage of its corresponding DC power supply 02i.

The plurality of equalization voltages generated by the plurality of current sharing modules 01i are output to the current sharing bus to generate a current sharing bus voltage, and each current sharing module 01i generates a feedback signal according to the current sharing bus voltage to adjust the output of the corresponding DC power supply 02i. There are two specific situations for voltage:

In the first case, when one of the plurality of current sharing modules 01i is the main current sharing module 01i, and the plurality of current sharing modules 01i other than the main current sharing module 01i are from the current sharing module 01i, The plurality of equalization voltages generated by the current sharing modules 01i are output to the current sharing bus to generate a current sharing bus voltage, and each current sharing module 01i generates a feedback signal according to the current sharing bus voltage to adjust the output voltage of the corresponding DC power supply 02i. The equalization voltage of the main current sharing module is output to the current sharing bus to generate a current sharing bus voltage, and each of the current sharing modules compares the respective equalization voltage and the current sharing bus voltage, and generates a feedback signal to adjust each of the current sharing modules. The output voltage of the corresponding DC power supply.

Optionally, one current sharing module with the largest equalization voltage in the plurality of current sharing modules is a primary current sharing module, and the plurality of current sharing modules except the main current sharing module are slave current sharing modules.

Optionally, one of the plurality of current sharing modules is set as a primary current sharing module, and the plurality of current sharing modules except the main current sharing module are set as a secondary current sharing module.

In the second case, the plurality of equalization voltages generated by the plurality of current sharing modules 01i are output to the current sharing bus to generate a current sharing bus voltage, and each current sharing module 01i generates a feedback signal according to the current sharing bus voltage to adjust its corresponding DC voltage. The output voltage of the power source 02i is specifically: a plurality of equalization voltages generated by the plurality of current sharing modules 01i are output to the current sharing bus to generate a current sharing bus voltage, and each current sharing module 01i performs a corresponding equalization voltage and a current sharing bus voltage. Comparing and generating a feedback signal to adjust the output voltage of the DC power source 02i corresponding to each current sharing module 01i.

The LED load module can be a series of LED modules, a parallel LED module or a single LED.

FIG. 3 shows an example circuit structure of a current sharing module 01i in an LED constant voltage current sharing system according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are detailed below. :

The current sharing module 01i includes a current sharing chip U1, an optical coupling U2, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The current detecting terminal SENSE and the current sharing chip U1 The first end of the resistor R1 is the current sampling end of the current sharing module 01i, the power terminal Vcc of the current sharing chip U1 is connected to the first end of the second resistor R2, and the current regulating terminal ADJ of the current sharing chip U1 and the optical coupling The diode negative terminal is connected, the current regulation setting terminal ADJR of the current sharing chip U1 is connected with the first end of the third resistor R3, and the external capacitor terminal COMP of the current sharing chip U1 is connected with the first end of the first capacitor C1, and the current sharing chip U1 The bus terminal SHARE+ is the equalized voltage terminal of the current sharing module 01i, the bus reference terminal SHARE- of the current sharing chip U1, the ground terminal GND of the current sharing chip U1, the second end of the first resistor R1, and the first end of the third resistor R3. The emitter of the optocoupler U2 and the first end of the fourth resistor R4 are connected to the power ground. The second end of the second resistor R2 is connected to the anode of the photocoupler U2, and the collector of the optocoupler U2 is a current sharing module. 01i feedback output.

The current sharing chip U1 includes a first operational amplifier U11, a second operational amplifier U12, a third operational amplifier U13, a fourth operational amplifier U14, a first diode D1, and a first transistor Q1, and a first operational amplifier U11. The inverting input terminal is the current detecting terminal of the current sharing chip U1, and the non-inverting input terminal of the first operational amplifier U11 is the grounding terminal GND of the current sharing chip U1, and the output terminal of the first operational amplifier U11 and the second operational amplifier U12 are positive. The input terminal is connected to the inverting input terminal of the fourth operational amplifier U4, the inverting input terminal of the second operational amplifier U12, the forward input terminal of the third operational amplifier U13, and the negative terminal of the first diode D1 are current sharing chips. The bus terminal SHARE+ of U1, the output terminal of the second operational amplifier U12 is connected to the anode of the first diode D1, and the output terminal of the third operational amplifier U13 is connected to the forward input terminal of the fourth operational amplifier U14, and the third operational amplifier The inverting input terminal of U13 is the bus reference terminal SHARE- of the current sharing chip U1, the output terminal of the fourth operational amplifier U14 is connected to the base of the first transistor Q1, and the collector of the first transistor Q1 is current sharing. Chip U1 Flow regulating terminal ADJ, the emitter electrode of the first transistor Q1 is a current flow are set terminal regulator chip U1 ADJR.

The following is a description of the current sharing module 01i of the LED constant voltage current sharing system shown in FIG. 3 in combination with the working principle:

The current sampling signal of the DC power source is input to the first operational amplifier U11 through the current detecting terminal SENSE of the current sharing chip U1, and the first operational amplifier U11 is amplified and divided into two signal outputs, and one path is amplified by the second operational amplifier U12 and then passed through the current sharing. The bus terminal SHARE+ of the chip U1 is output to the current sharing bus. Since the output terminal of the second operational amplifier U12 and the bus terminal SHARE+ of the current sharing chip U1 have a diode, the current sharing module with the largest output current value on the current sharing bus becomes the main module. The remaining current sharing modules are adjusted according to the output current value of the main module. Due to the function of the main module, the level of the forward input terminal of the fourth operational amplifier U14 of each slave module is locked to a constant value. If the output current of a current sharing module is small, the positive of the fourth operational amplifier U14 The level to the input terminal is small, the output level of the fourth operational amplifier U14 is large, and the current flowing through the first transistor Q1 is also large, so the current of the collector of the photocoupler U2 is large, thereby completing the current sharing adjustment.

FIG. 4 is a diagram showing another example circuit structure of the current sharing module 01i in the LED constant voltage current sharing system according to the embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown. as follows:

The current sharing module 01i includes a fifth operational amplifier U5, a sixth operational amplifier U6, a seventh operational amplifier U7, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a fifth resistor R5, and a sixth Resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth Resistor R15, sixteenth resistor R16 and seventeenth resistor R17;

The positive input terminal of the fifth operational amplifier U5 is connected to the first end of the third capacitor C3 and the first end of the fifth resistor R5, and the inverting input terminal of the fifth operational amplifier U5 and the first end of the eighth resistor R8 The first end of the tenth resistor R10 is connected, the output end of the fifth operational amplifier U5 is connected to the second end of the eighth resistor R8 and the first end of the eleventh resistor R11, and the positive input terminal of the sixth operational amplifier U6 is The first end of the second capacitor C2 is connected to the first end of the seventh resistor R7, and the inverting input end of the sixth operational amplifier U6 is connected to the first end of the ninth resistor R9 and the second end of the tenth resistor R10, The output end of the sixth operational amplifier U6 is connected to the second end of the ninth resistor R9 and the first end of the twelfth resistor R12, and the inverting input terminal of the seventh operational amplifier U7 and the second end of the eleventh resistor R11 are a first end of the fourth capacitor C4 and a first end of the fifteenth resistor R15, the forward input end of the seventh operational amplifier U7 is connected to the second end of the twelfth resistor R12 and the first end of the thirteenth resistor R13, The output end of the seventh operational amplifier U7 and the first end of the fourteenth resistor R14, and the fifteenth resistor R15 The first end of the sixteenth resistor R16 and the first end of the seventeenth resistor R17 are the feedback output of the current sharing module 01i, and the second of the seventeenth resistor R17 The terminal is connected to the first power source VAA, the second end of the fifth resistor R5 and the first end of the sixth resistor R6 are the current sampling end of the current sharing module 01i, the second end of the seventh resistor R7 and the sixth resistor R6 The second end is the equalized voltage end of the current sharing module 01i, the second end of the fourteenth resistor R14 is connected to the second end of the fourth capacitor C4, the second end of the third capacitor C3, the second end of the second capacitor C2, and The second end of the thirteenth resistor R13 is connected to the power ground.

The following is a description of the current sharing module 01i of the LED constant voltage current sharing system shown in FIG. 4 in combination with the working principle:

If the equalization voltage (the voltage of the second end of the seventh resistor R7 and the second end of the sixth resistor R6) is less than the current sharing bus voltage, the fifth operational amplifier U5 and the sixth operational amplifier U6 are used to check the amplification and the seventh operation of the subsequent stage. After the amplifier U6 is amplified, at the output end of the seventh operational amplifier U6, a voltage value of the DC power supply and the current-sharing bus voltage error n times the amplified voltage value can be obtained, and the output voltage is positive, so that the voltage value is raised. Thereby, the output voltage of the feedback output terminal (the second end of the sixteenth resistor R16 and the first end of the seventeenth resistor R17) of the current sharing module 01i is increased, and the output voltage of the DC power source is increased.

FIG. 5 is a block diagram showing a structure of a current sharing module 01i in an LED constant voltage current sharing system according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are detailed below. :

The current sharing module 01i includes a first amplifier 01i-1, a second amplifier 01i-2, a bus control module 01i-3, a clamp module 01i-4, and a third amplifier 01i-5;

The output of the first amplifier 01i-1 and the input of the second amplifier 01i-2, the input of the clamp module 01i-4, and the second input of the third amplifier 01i-5, the output of the second amplifier 01i-2 The end is connected to the second input and output end of the bus control module 01i-3, the input and output end of the clamp module 01i-4, and the first input end of the third amplifier 01i-5;

The first input end and the second input end of the first amplifier 01i-1 together form a current sampling end of the current sharing module 01i, and the first input and output end of the bus control module 01i-3 is a balanced voltage end of the current sharing module 01i, The output of the three amplifier 01i-5 is the feedback output of the current sharing module 01i;

The first amplifier 01i-1 detects an output voltage of the DC power source 02i corresponding to the current sharing module 01i, and generates a first voltage according to the output voltage, and the second amplifier 01i-2 generates a second voltage according to the first voltage, the bus control module 01i- 3 generating an equalization voltage according to the second voltage, the clamping module 01i-4 clamps the equalization voltage, the plurality of equalization voltages generate a current sharing bus voltage, and the third amplifier 01i-5 compares the first voltage and the current sharing bus voltage, And generating a feedback signal to adjust the output voltage of the DC power source 02i corresponding to the current sharing module 01i.

6 shows an exemplary circuit configuration diagram corresponding to the current sharing module 01i in the LED constant voltage current sharing system provided in FIG. 5. For convenience of explanation, only parts related to the embodiment of the present invention are shown. Said as follows:

The first amplifier 01i-1 includes an eighth operational amplifier U8, an adjustable resistor R01, a fifth capacitor C5, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, and a second The thirteenth resistor R23 and the twenty-fourth resistor R24; the eighth operational amplifier U8 is connected to the first end of the eighteenth resistor R18, and the eighth operational amplifier U8 is opposite to the input terminal and the twentieth resistor R20 One end is connected to the first end of the twenty-first resistor R21. The second end of the eighteenth resistor R18, the first end of the nineteenth resistor R19, and the first end of the fifth capacitor C5 are the first amplifier 01i-1. The first input end, the second end of the twentieth resistor R20, the second end of the nineteenth resistor R19, and the second end of the fifth capacitor C5 are the second input end of the first amplifier 01i-1, and the eighth operation The output end of the amplifier U8 is connected to the first end of the twenty-fourth resistor R24, the adjustment end of the adjustable resistor R01, the first fixed end of the adjustable resistor R01, and the first end of the twenty-third resistor R23, the twenty-first The second end of the resistor R21 is connected to the second fixed end of the adjustable resistor R01 and the second end of the twenty-third resistor R23, A first terminal of a second amplifier output fourteen resistor R24 to 01i-1.

The second amplifier 01i-2 includes a ninth operational amplifier U9, a twenty-fifth resistor R25, a twenty-sixth resistor R26, and a twenty-seventh resistor R27; a forward input terminal and a twenty-fifth resistor of the ninth operational amplifier U9 The first end of the R25 is connected, the second end of the twenty-fifth resistor R25 is the input end of the second amplifier 01i-2, the inverting input terminal of the ninth operational amplifier U9 and the output end of the ninth operational amplifier U9 and the second The first end of the seventeen resistor R27 is connected, and the second end of the twenty seventh resistor R27 is the output of the second operational amplifier.

The bus control module 01i-3 includes a first FET M1, a second FET M2, and a twenty-eighth resistor R28; the drain of the first FET M1 is a first input and output of the bus control module 01i-3, The source of the first field effect transistor M1 is connected to the drain of the second field effect transistor M2, and the source of the second field effect transistor M2 is the second input and output end of the bus control module 01i-3, and the first field effect transistor M1 The gate is connected to the gate of the second field effect transistor M2, the first end of the twenty-eighth resistor R28, and the bus control signal, and the second end of the twenty-eighth resistor R28 is connected to the second power source VBB.

The clamping module 01i-4 includes a second diode D2, a sixth capacitor C6, a twenty-ninth resistor R29, and a thirtieth resistor R30; a first end of the twenty-ninth resistor R29 and a second diode D2 The negative electrode is the input and output end of the clamp module 01i-4, the second end of the twenty-ninth resistor R29 and the third power source VDD, the first end of the sixth capacitor C6, the anode of the second diode D2, and the thirtyth The first end of the resistor R30 is connected, and the second end of the sixth capacitor C6 and the second end of the thirtieth resistor R30 are the input ends of the clamping module 01i-4.

The third amplifier 01i-5 includes a tenth operational amplifier U10, a seventh capacitor C7, a thirty-first resistor R31, and a thirty-second resistor R32; the positive input terminal of the tenth operational amplifier U10 is the third amplifier 01i-5. a first input end, an inverting input terminal of the tenth operational amplifier U10, a first end of the seventh capacitor C7, and a first end of the thirty first resistor R31 are second input ends of the third amplifier 01i-5, tenth The output end of the operational amplifier U10 is connected to the first end of the thirty-second resistor R32, the second end of the seventh capacitor C7, and the second end of the thirty-first resistor R31. The second end of the thirty-second resistor R32 is The output of the third amplifier 01i-5.

The following is a description of the current sharing module 01i of the LED constant voltage current sharing system shown in FIG. 6 in combination with the working principle:

The input terminal of the eighth operational amplifier U8 is connected to the sampling resistor of the DC power supply, and the amplified current signal is output to the inverting input terminal of the tenth operational amplifier U10, and the other route is amplified by the ninth operational amplifier U9 to the current sharing bus. And the positive phase input of the tenth operational amplifier U10. If the output current of a DC power supply is smaller than other DC power supplies, the voltage of the non-inverting input terminal of the tenth operational amplifier U10 will be higher than the voltage of the inverting input terminal, and the voltage of the output terminal of the tenth operational amplifier U10 will increase, that is, increase the direct current. The output voltage of the power supply increases the output current. If the output current of a DC power supply is greater than other DC power supplies, the voltage of the non-inverting input terminal of the tenth operational amplifier U10 will be lower than the voltage of the inverting input terminal, and the voltage of the output terminal of the tenth operational amplifier U10 is reduced, that is, the DC power supply is lowered. The output voltage is reduced by the output current. Thereby achieving the purpose of current sharing.

In summary, the embodiment of the present invention includes a plurality of current sharing modules, a plurality of DC power sources, and an LED load module; the plurality of current sharing modules are connected to the plurality of DC power sources one by one, and each current sharing module detects each corresponding The output voltage of the DC power source generates an equalization voltage according to the output voltage, and a plurality of equalization voltages generated by the plurality of current sharing modules are output to the current sharing bus to generate a current sharing bus voltage, and each current sharing module generates a feedback according to the current sharing bus voltage. The signal adjusts the output voltage of the corresponding DC power supply, so that the current sharing effect of the parallel power supply of the LED load module can be improved.

There is also an LED thermostat system similar to the LED constant voltage current sharing system, which maintains multiple parallel DC power supplies at the same operating temperature and supplies power to the LED load modules, as follows:

The utility model comprises a plurality of DC power sources, a plurality of sensor modules and a plurality of microprocessors, wherein each sensor obtains the temperature of each DC power source corresponding to each sensor, and then obtains an average temperature through the microprocessor, and finally the microprocessor is configured according to The average temperature and the temperature of each of the DC power sources determine the feedback signals of each of the DC power sources, and each of the DC power sources adjusts the output voltage/output current according to the respective corresponding feedback signals. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims (13)

An LED constant voltage current sharing system, wherein the LED constant voltage current sharing system comprises a plurality of current sharing modules, a plurality of DC power sources, and an LED load module; The plurality of current sharing modules are connected to the plurality of DC power sources in a one-to-one correspondence, wherein the current sampling end and the feedback output end of each current sharing module are respectively connected to the sampling end and the feedback input end of the corresponding DC power supply. The equalization voltage ends of the plurality of current sharing modules are connected to the current sharing bus, and the positive output ends of the plurality of DC power sources are connected to the first end of the LED load module, and the negative output terminals of the plurality of DC power sources And the second end of the LED load module is connected to the power ground; Each of the current sharing modules detects an output voltage of a corresponding DC power source, and generates an equalization voltage according to the output voltage, and the plurality of equalization voltages generated by the plurality of current sharing modules are output to the current sharing bus to generate A bus voltage, each current sharing module generating a feedback signal according to the current sharing bus voltage to adjust an output voltage of its corresponding DC power supply. The LED constant voltage current sharing system according to claim 1, wherein one of the plurality of current sharing modules is a main current sharing module, and the plurality of current sharing modules other than the main current sharing module The module is a current equalization module, and the plurality of equalization voltages generated by the plurality of current sharing modules are output to the current sharing bus to generate a current sharing bus voltage, and each current sharing module generates feedback according to the current sharing bus voltage The signal is adjusted to adjust the output voltage of its corresponding DC power supply as follows: The equalized voltage of the main current sharing module is output to the current sharing bus to generate a current sharing bus voltage, and each of the slave current sharing modules compares the respective equalization voltage and the current sharing bus voltage, and generates a feedback signal to adjust each of the slaves. The output voltage of the DC power supply corresponding to the current sharing module. The LED constant voltage current sharing system according to claim 2, wherein one of the plurality of current sharing modules having the largest equalization voltage is a main current sharing module, and the main current sharing module is The multiple current sharing modules are slave current sharing modules. The LED constant voltage current sharing system according to claim 2, wherein one of the plurality of current sharing modules is set as a main current sharing module, and the plurality of current sharing modules are The current sharing module is set to the slave current sharing module. The LED constant voltage current sharing system according to claim 3, wherein the current sharing module comprises a current sharing chip, an optocoupler, a first capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor. ; The current detecting end of the current sharing chip and the first end of the first resistor are current sampling ends of the current sharing module, and the power end of the current sharing chip is connected to the first end of the second resistor, The current regulating end of the current sharing chip is connected to the negative end of the light emitting diode of the optocoupler, and the current regulating setting end of the current sharing chip is connected to the first end of the third resistor, and the external connection of the current sharing chip a capacitor end is connected to the first end of the first capacitor, a bus end of the current sharing chip is an equalization voltage end of the current sharing module, a bus reference end of the current sharing chip, and a grounding of the current sharing chip a second end of the first resistor, a first end of the third resistor, an emitter of the optocoupler, and a first end of the fourth resistor are connected to a power ground, the second resistor The second end is connected to the anode of the light-emitting diode of the optocoupler, and the collector of the optocoupler is a feedback output end of the current sharing module. The LED constant voltage current sharing system according to claim 1, wherein a plurality of equalization voltages generated by said plurality of current sharing modules are output to said current sharing bus to generate a current sharing bus voltage, said each The flow module generates a feedback signal according to the current sharing bus voltage to adjust an output voltage of the corresponding DC power supply: And outputting, by the plurality of current sharing modules, a plurality of equalization voltages to the current sharing bus to generate a current sharing bus voltage, wherein each current sharing module compares the corresponding equalized voltage and the current sharing bus voltage, And generating a feedback signal to adjust an output voltage of the DC power source corresponding to each of the current sharing modules. The LED constant voltage current sharing system according to claim 6, wherein the current sharing module comprises a fifth operational amplifier, a sixth operational amplifier, a seventh operational amplifier, a second capacitor, a third capacitor, and a fourth capacitor. , fifth capacitor, fifth resistor, sixth resistor, seventh resistor, eighth resistor, ninth resistor, tenth resistor, eleventh resistor, twelfth resistor, thirteenth resistor, fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor; a forward input end of the fifth operational amplifier is connected to a first end of the third capacitor and a first end of the fifth resistor, and an inverting input end of the fifth operational amplifier and the eighth resistor The first end is connected to the first end of the tenth resistor, and the output end of the fifth operational amplifier is connected to the second end of the eighth resistor and the first end of the eleventh resistor, a forward input terminal of the sixth operational amplifier is coupled to the first end of the second capacitor and the first end of the seventh resistor, and the inverting input terminal of the sixth operational amplifier and the first resistor One end is connected to the second end of the tenth resistor, and an output end of the sixth operational amplifier is connected to the second end of the ninth resistor and the first end of the twelfth resistor, the seventh An inverting input of the operational amplifier and a second end of the eleventh resistor, a first end of the fourth capacitor, and a first end of the fifteenth resistor, a forward input of the seventh operational amplifier The end is connected to the second end of the twelfth resistor and the first end of the thirteenth resistor, An output end of the seventh operational amplifier is connected to a first end of the fourteenth resistor, a second end of the fifteenth resistor, and a first end of the sixteenth resistor, the sixth resistor The first end of the two ends and the seventeenth resistor are the feedback output end of the current sharing module, the second end of the seventeenth resistor is connected to the first power source, and the second end of the fifth resistor is The first end of the sixth resistor is a current sampling end of the current sharing module, and the second end of the seventh resistor and the second end of the sixth resistor are equalized voltage ends of the current sharing module, The second end of the fourteenth resistor is connected to the second end of the fourth capacitor, the second end of the third capacitor, the second end of the second capacitor, and the third resistor The two ends are connected to the power ground. The LED constant voltage current sharing system according to claim 6, wherein the current sharing module comprises a first amplifier, a second amplifier, a bus control module, a clamp module, and a third amplifier; An output of the first amplifier and an input of the second amplifier, an input of the clamp module, and a second input of the third amplifier, an output of the second amplifier, and the bus a second input and output end of the control module, an input and output end of the clamp module, and a first input end of the third amplifier; The first input end and the second input end of the first amplifier together constitute a current sampling end of the current sharing module, and the first input and output end of the bus line control module is a balanced voltage end of the current sharing module. The output end of the third amplifier is a feedback output end of the current sharing module; The first amplifier detects an output voltage of a DC power source corresponding to the current sharing module, and generates a first voltage according to the output voltage, and the second amplifier generates a second voltage according to the first voltage, the bus bar The control module generates an equalization voltage according to the second voltage, the clamping module clamps the equalization voltage, the plurality of equalization voltages generate the current sharing bus voltage, and the third amplifier pairs the first voltage and The current sharing bus voltages are compared, and a feedback signal is generated to adjust an output voltage of the DC power supply corresponding to the current sharing module. The LED constant voltage current sharing system according to claim 8, wherein the first amplifier comprises an eighth operational amplifier, an adjustable resistor, a fifth capacitor, an eighteenth resistor, a nineteenth resistor, and a twentieth a resistor, a twenty-first resistor, a twenty-third resistor, and a twenty-fourth resistor; The eighth operational amplifier forward input terminal is coupled to the first end of the eighteenth resistor, the eighth operational amplifier inverting input terminal and the first end of the twentieth resistor and the twentieth a first end of the first amplifier, a first end of the eighteenth resistor, a first end of the nineteenth resistor, and a first end of the fifth capacitor being a first input of the first amplifier a second end of the twentieth resistor, a second end of the nineteenth resistor, and a second end of the fifth capacitor being a second input of the first amplifier, the eighth operational amplifier The output end is connected to the first end of the twenty-fourth resistor, the adjustment end of the adjustable resistor, the first fixed end of the adjustable resistor, and the first end of the twenty-third resistor, a second end of the twenty-first resistor is connected to the second fixed end of the adjustable resistor and the second end of the twenty-third resistor, and the second end of the twenty-fourth resistor is the first end The output of the amplifier. The LED constant voltage current sharing system according to claim 8, wherein the second amplifier comprises a ninth operational amplifier, a twenty-fifth resistor, a twenty-sixth resistor, and a twenty-seventh resistor; a forward input end of the ninth operational amplifier is connected to a first end of the twenty-fifth resistor, and a second end of the twenty-fifth resistor is an input end of the second amplifier, the ninth An inverting input terminal of the operational amplifier is connected to an output end of the ninth operational amplifier and a first end of the twenty-seventh resistor, and a second end of the twenty-seventh resistor is a second operational amplifier Output. The LED constant voltage current sharing system according to claim 8, wherein the bus bar control module comprises a first field effect transistor, a second field effect transistor, and a twenty-eighth resistor; a drain of the first FET is a first input and output of the bus control module, a source of the first FET is connected to a drain of the second FET, and the second field The source of the effect tube is the second input and output end of the bus control module, the gate of the first field effect transistor and the gate of the second field effect transistor, and the first end of the twenty-eighth resistor And a bus control signal connection, the second end of the twenty-eighth resistor is connected to the second power source VBB. The LED constant voltage current sharing system according to claim 8, wherein the clamping module comprises a second diode, a sixth capacitor, a twenty-ninth resistor, and a thirtieth resistor; The first end of the twenty-ninth resistor and the cathode of the second diode are the input and output ends of the clamping module, and the second end of the twenty-ninth resistor is connected to the third power source VDD a first end of the sixth capacitor, a positive pole of the second diode, and a first end of the thirtieth resistor connected, a second end of the sixth capacitor and a second end of the thirtieth resistor The end is the input of the clamping module. The LED constant voltage current sharing system according to claim 8, wherein the third amplifier comprises a tenth operational amplifier, a seventh capacitance, a thirty-first resistance, and a thirty-second resistance; a forward input end of the tenth operational amplifier is a first input end of the third amplifier, an inverse input end of the tenth operational amplifier, a first end of the seventh capacitor, and the thirtieth a first end of the resistor is a second input of the third amplifier, an output of the tenth operational amplifier and a first end of the thirty-second resistor, a second end of the seventh capacitor, and The second end of the thirty-first resistor is connected, and the second end of the thirty-second resistor is an output end of the third amplifier.