CN115426735A - A digital communication high-power LED drive control system with light attenuation compensation - Google Patents

Abstract

The invention relates to an LED drive control system, especially a digital communication high-power LED drive control system with light attenuation compensation. The invention can intelligently judge the degree of light attenuation according to actual working conditions, intelligently give circuit compensation values, and avoid using a section The light intensity will become weaker after time; the adjustment range of current 0-20A can be realized, and the adjustment accuracy can reach ±6%. When the appropriate input and output voltages are met, the adjustable accuracy of the output current can reach ±3%. The protocol transmits the control signal sent by the control device, the control signal includes the current output current, the output threshold voltage (for different LED operating voltages, the external control device configures different output voltage thresholds through communication, the range can reach (6V‑35V), the enable signal , It can also feed back the system ambient temperature, LED operating temperature, and real-time output voltage information to the external control device.

Description

A digital communication high-power LED drive control system with light attenuation compensation

technical field

The invention relates to an LED drive control system, in particular to a digital communication high-power LED drive control system with light attenuation compensation.

Background technique

LED can efficiently convert electrical energy into light energy. It is a commonly used light-emitting device and is widely used in the field of lighting. In scenes such as shooting fill light, projection, plant fill light, etc., it is necessary for the LED light source to be able to change continuously and accurately under control, so it is very important to be able to communicate with other devices and meet the requirements of precise dimming. LED has a nonlinear voltage Safety characteristics, a small voltage fluctuation will lead to a large current change, so the output power changes drastically, but the existing LED light source has the following problems:

1. Due to long-term LED working, there will be light intensity attenuation, that is, under the same power, the light intensity will become weaker after a period of use. Calculate the working time to compensate, not to compensate according to the actual attenuation) to perform attenuation compensation;

2. Most LED drive circuits have the problem of poor scalability, that is, they cannot be controlled by the host computer or other external devices;

3. In the existing LED adjustable main drive circuits, although some claim to be high-power, the actual power is not very high. Although there are high-power main drive circuits, they are not adjustable. Generally, a fixed value is output to match the fixed LED lights, poor compatibility.

Therefore, a digital communication high-power LED drive control system with light attenuation compensation is needed to improve the above problems.

Contents of the invention

The object of the present invention is to provide a digital communication high-power LED drive control system with light attenuation compensation to solve the problems raised in the above-mentioned background technology.

To achieve the above object, the present invention provides the following technical solutions:

A digital communication high-power LED drive control system with light attenuation compensation, including a main drive module, the main drive module is electrically connected to a MOS switch and a microcontroller module, and the MOS switch is electrically connected to the main power supply through the step-down module. connection, the MOS switch is electrically connected to an output voltage acquisition module, the output voltage acquisition module is electrically connected to an LED module, the electrical module between the output voltage acquisition module and the main drive module, the active drive module and the microcontroller module A temperature acquisition module is electrically connected between them, the microcontroller module is electrically connected to a communication module, and the communication module is electrically connected to an external control device.

As a preferred solution of the present invention, the main drive module includes U1, Q1, Q2, P1, P2 and U5, U1 is a fixed-frequency synchronous step-down DC/DC controller LT3741, and uses LT3741 and MOSFETs Q1 and Q2 to form the main conversion Circuit, step-down and constant current conversion of the input power supply, and convert it into a constant current power supply for driving LEDs. The main drive circuit receives the enable and DAC analog voltage signals from the microcontroller U2, and controls the start-stop and output of the main drive circuit. The size of the current; LT3741's 3-pin is the chip power input pin, which constitutes a constant current circuit, the input voltage (VIN) range is 6-36V, the output voltage range is VIN-2V (4-34V), and the output current is 20A continuous Adjustable, the 4-pin EN/UVLO is the enable pin, the maximum input voltage is less than 6V, when the 4-pin voltage is less than 1.55V, the LT3741 is disabled and stops working; on the contrary, when the voltage is 1.55-6V LT3741 is enabled and starts to work, the 4-pin Connect with the A1 I/O port of the microcontroller U2. When A1 is set to high level (3.3V), the main drive circuit enters the ready working state; otherwise, it stops working when it is low level (0V), and the 8-pin CTRL1 is the output current setting Pin, the maximum input voltage is less than 2V, the normal input voltage is 0-1.5V, and the corresponding output current is 0-20A. When the LT3741 is enabled and there is a current signal, the main drive circuit works, and the 10-pin FB pin is connected to the external The digital potentiometer U5 sets the output voltage threshold. When the real-time output voltage exceeds 125% of the set voltage, the circuit triggers overvoltage protection, and the main drive circuit stops output. The resistor connected to 14-pin RT is used to configure the operating frequency of the main drive circuit. Here, the operating frequency of the main drive circuit is set to 400kHz; U5 receives the SPI communication signal from the microcontroller U2 to set the resistance value of the U5 digital potentiometer, thereby setting the output voltage threshold, single channel, linear change, and a full resistance value of 100kΩ Digital potentiometer with 256 taps. This device can be used as a three-terminal potentiometer. The internal register of TPL0501 can use SPI communication to set its resistance value. Its pins 7, 1, and 8 are equivalent to the three pins of an ordinary adjustable potentiometer. Set the resistance value of pin 7 and pin 1 to Ra, then the resistance value of pin 1 and pin 8 is Rb=(100-Ra)kΩ, which can be obtained according to the principle of resistance voltage division, and the output of pin TPL0501-1 is to pin 10 of LT3741 The feedback voltage V _FB (V _{VCC_OUT} is the system output voltage) is:

Therefore, the output voltage threshold can be set by changing the resistance value of the digital potentiometer TPL0501. Compared with traditional mechanical potentiometers, this program-controlled output voltage threshold method is more linear and can quickly reach the desired threshold voltage. It can be directly passed through the program according to the voltage level of the load LED without changing the hardware structure. It is also more convenient and more compatible to change the output voltage threshold. Its 4-pin SCLK is the SPI clock signal; 5-pin DIN inputs the SPI MOSI (master output slave input) data signal; 6-pin CS is the chip select signal. When multiple slaves are mounted on the SPI, you can set the CS The level is high or low to choose which slave to communicate with, here the default is low level, because there is only one slave on the SPI bus, pins 4, 5, 6 of U5 and A10, A11, A12 of the microcontroller U2 I /O connection is used for SPI data communication; the U1 uses a fixed frequency synchronous step-down DC/DC controller LT3741 and Q1, Q2 to form the main conversion circuit, the U5 uses a digital potentiometer TPL0501, and the main drive module also includes Inductor L1, capacitor C9, and capacitor C10, the inductor L1, capacitor C9, and capacitor C10 form a filter circuit to reduce output current and voltage ripple;

R6 is a current sampling resistor with high precision and low resistance, which is used for current closed-loop control. According to Ohm's law U=IR, I=U/R, the output current can be obtained by measuring the voltage across R6;

LED1 is the output indicator light, and the resistor R7 in series with it is used to divide the voltage. This structure can also act as a discharge circuit. When the load is disconnected, this part can be used to discharge the electric energy stored in the capacitors C9 and C10;

Among them, P1 and P2 are the power input and output interfaces respectively, and adopt the connection method of multiple pin headers in parallel, which can not only carry the rated current, but also facilitate the connection with other devices.

As a preferred solution of the present invention, the microcontroller module includes a microcontroller U2, and the model is the domestic Zhaoyi Innovation GD32F350G8U6, which is used to send current control and enable signals to the main drive module. Communication mode Set the resistance value of U5 digital potentiometer TPL0501, so that the output threshold voltage can be set to match LEDs of different voltage levels; collect system ambient temperature, LED operating temperature, and real-time output voltage; communicate with external control equipment and receive external control Equipment signal or feedback system ambient temperature, LED operating temperature, real-time output voltage.

As a preferred solution of the present invention, the step-down module adopts a step-down chip, the model of which is AMS1117-3.3, which is used to convert the input 5V voltage into 3.3V to supply power for the microcontroller U2 and U5 digital potentiometer TPL0501. .

As a preferred solution of the present invention, the temperature acquisition module includes P4 and P6, the P4 is connected to R15 and R16, the P6 is connected to R11 and R12, and the 10kΩ NTC resistor and R15 are used to form a voltage divider circuit. When P4 is connected When the NTC resistance changes due to temperature, the voltage at the right end of R16 (input to the microcontroller U2) changes according to the principle of voltage division. The microcontroller U2 collects this voltage V _ADC5 through the ADC, and calculates the NTC at this time according to the formula Resistance value R _NTC , and then use the look-up table method (find the table corresponding to the temperature and NTC resistance value) to obtain the temperature information at this time. The ambient temperature acquisition process is the same.

As a preferred solution of the present invention, the communication module includes a microcontroller U3, a transient suppression diode D3 and P3, the microcontroller U3 adopts the Modbus protocol to communicate and exchange data, and the U3-10 pin and the microcontroller U2 The serial port sending end is connected, U3-12 pins are connected with the serial port receiving end of the microcontroller U2, and the U3 model is MAX3232EEAE, which converts the logical signal level of the microcontroller and the level of RS232 mutually, and the present invention can communicate with the external control equipment through RS232 connection, use Modbus protocol to communicate and exchange data. The microcontroller uses 3.3V TTL level serial port communication, while RS232 is a negative logic level, which defines +3~+15V as low level, and -15~-3V as high level, RS232 serial port RX and TX need to be level-shifted before they can be connected to the pins of the microcontroller, otherwise the high voltage is likely to burn the microcontroller;

J1 is the RS232 standard interface of DB-9, D3 is a transient suppression diode (TVS), because J1 is a hardware interface connected with external control equipment, when there is high-voltage static electricity on the hardware connected to J1, it may damage the device. In the RS232 hardware circuit part of the invention, the D3 connected in parallel to the interface circuit can absorb electric energy first, so that the RS323 hardware circuit is not damaged by high-voltage static electricity.

As a preferred solution of the present invention, the output voltage acquisition module includes D4, D4 is connected with A4/ADC4, and the A4/ADC4 is connected with R17 and R18, and the R17 and R18 form a voltage divider circuit, and the A4/ADC4 and The ADC acquisition pin of the microcontroller U2 is connected, the D4 is a 3.3V Zener diode ZM4728, V _{VCC_OUT} is the system output voltage, and A4/ADC4 is connected with the ADC acquisition pin of the microcontroller U2. When V _{VCC_OUT} changes, according to the principle of voltage division between R17 and R18 (the voltage input to the microcontroller U2 changes, the microcontroller U2 collects this voltage V _ADC4 through the ADC, and the system V _{VCC_OUT} at this time can be calculated according to the formula The actual output voltage. D4 is a 3.3V Zener diode ZM4728, which is used to prevent the microcontroller I/O from being damaged by high voltage.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention can intelligently judge the degree of light attenuation according to the actual working conditions, intelligently give the circuit compensation value, and avoid the weakening of the light intensity after a period of use;

2. The present invention transmits the control signal sent by the control device through the Modbus protocol. The control signal includes the current output current and the output threshold voltage (for different LED operating voltages, the external control device configures different output voltage thresholds through communication, and the range can reach (6V- 35V), enable signal, and can also feed back system ambient temperature, LED operating temperature, and real-time output voltage information to external control equipment;

3. The present invention can realize the highest power output of 680W, realize the adjustment range of the current 0-20A, and the adjustment accuracy can reach ±6%. When the appropriate input and output voltages are met, the adjustable accuracy of the output current can reach ±3%. High compatibility.

Description of drawings

Fig. 1 is a system block diagram of the present invention;

Fig. 2 is the flow chart of program execution of the present invention;

Fig. 3 is the circuit diagram of main drive module among the present invention;

Fig. 4 is the circuit diagram of microcontroller module among the present invention;

Fig. 5 is the circuit diagram of step-down chip among the present invention;

Fig. 6 is the circuit diagram of the temperature acquisition module of the present invention;

Fig. 7 is the circuit diagram of the communication module of the present invention;

Fig. 8 is a circuit diagram of the output voltage acquisition module of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the present invention Embodiments, and all other embodiments obtained by persons of ordinary skill in the art without creative efforts, all belong to the scope of protection of the present invention.

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant ones. Several examples of the invention are given. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

It should be noted that when an element is referred to as being “fixed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to Figures 1-8, the present invention provides a technical solution:

For the embodiment, please refer to Figures 1-8, a digital communication high-power LED drive control system with light attenuation compensation, including a main drive module, the main drive module is electrically connected to a MOS switch and a microcontroller module, and the MOS switch passes through The step-down module is electrically connected to the main power supply, the MOS switch is electrically connected to the output voltage acquisition module, the output voltage acquisition module is electrically connected to the LED module, the electrical module is between the output voltage acquisition module and the main drive module, and the active drive module is connected to the main drive module. The microcontroller modules are electrically connected to a temperature acquisition module, the microcontroller modules are electrically connected to a communication module, and the communication module is electrically connected to an external control device.

Please refer to Figure 3. The main drive module includes U1, Q1, Q2, P1, P2 and U5. U1 uses a fixed frequency synchronous step-down DC/DC controller LT3741 to form the main conversion circuit with Q1 and Q2. U5 uses a digital potentiometer TPL0501 , the main drive module also includes inductor L1, capacitor C9, and capacitor C10. Inductor L1, capacitor C9, and capacitor C10 form a filter circuit, which steps down and converts the input power to a constant current power supply for driving LEDs. The main driver The circuit receives the enable and DAC analog voltage signal from the microcontroller U2, and controls the start and stop of the main drive circuit and the output current; pin 3 of the LT3741 is the input pin of the chip power supply, and the constant current circuit composed of it, the input voltage ( VIN) range is 6-36V, the output voltage range is VIN-2V (4-34V), the output current is 20A continuously adjustable, the 4-pin EN/UVLO is the enable pin, the maximum input voltage is less than 6V, when the 4-pin voltage is less than When the voltage is 1.55V, the LT3741 is disabled and stops working; on the contrary, when the voltage is 1.55-6V, the LT3741 is enabled and starts working, and the 4 pin is connected to the A1 I/O port of the microcontroller U2. When A1 is set to a high level (3.3V) The main drive circuit enters the ready working state; otherwise, it stops working when it is low (0V), and the 8-pin CTRL1 is the output current setting pin. The maximum input voltage is less than 2V, the normal input voltage is 0-1.5V, and the corresponding output current is 0-20A , when the LT3741 is enabled and there is a current signal, the main drive circuit works, and the 10-pin FB pin sets the output voltage threshold through the connected external digital potentiometer U5. When the real-time output voltage exceeds 125% of the set voltage, the circuit triggers overvoltage Protection, the main drive circuit stops output. The resistor connected to 14-pin RT is used to configure the operating frequency of the main drive circuit. Here, the operating frequency of the main drive circuit is set to 400kHz; U5 receives the SPI communication signal from the microcontroller U2 to set the resistance value of the U5 digital potentiometer, thereby setting the output voltage threshold, single channel, linear change, and a full resistance value of 100kΩ Digital potentiometer with 256 taps. This device can be used as a three-terminal potentiometer, and the internal register of TPL0501 can use SPI communication to set its resistance value. Its pins 7, 1, and 8 are equivalent to the three pins of an ordinary adjustable potentiometer. If the resistance value of pin 7 and pin 1 is set to Ra, then the resistance value of pin 1 and pin 8 is Rb=(100-Ra)kΩ , according to the principle of resistor voltage division, the feedback voltage V _FB (V _{VCC_OUT} is the system output voltage) output from the TPL0501-1 pin to the LT3741-10 pin is:

Therefore, the output voltage threshold can be set by changing the resistance value of the digital potentiometer TPL0501. Compared with traditional mechanical potentiometers, this program-controlled output voltage threshold method is more linear and can quickly reach the desired threshold voltage. It can be directly passed through the program according to the voltage level of the load LED without changing the hardware structure. It is also more convenient and more compatible to change the output voltage threshold. Its 4-pin SCLK is the SPI clock signal; 5-pin DIN inputs the SPI MOSI (master output slave input) data signal; 6-pin CS is the chip select signal. When multiple slaves are mounted on the SPI, you can set the CS The level is high or low to choose which slave to communicate with, here the default is low level, because there is only one slave on the SPI bus, pins 4, 5, 6 of U5 and A10, A11, A12 of the microcontroller U2 I /O connection is used for SPI data communication; the U1 uses a fixed frequency synchronous step-down DC/DC controller LT3741 and Q1, Q2 to form the main conversion circuit, the U5 uses a digital potentiometer TPL0501, and the main drive module also includes Inductor L1, capacitor C9, and capacitor C10, the inductor L1, capacitor C9, and capacitor C10 form a filter circuit to reduce output current and voltage ripple;

R6 is a current sampling resistor with high precision and low resistance, which is used for current closed-loop control. According to Ohm's law U=IR, I=U/R, the output current can be obtained by measuring the voltage across R6;

LED1 is the output indicator light, and the resistor R7 in series with it is used to divide the voltage. This structure can also act as a discharge circuit. When the load is disconnected, this part can be used to discharge the electric energy stored in the capacitors C9 and C10;

Among them, P1 and P2 are the power input and output interfaces respectively, and adopt the connection method of multiple pin headers in parallel, which can not only carry the rated current, but also facilitate the connection with other devices.

Please refer to Figure 4, please refer to Figures 1, 2 and 3. The microcontroller module includes a microcontroller U2, and the model is the domestic Zhaoyi Innovation GD32F350G8U6, which is used to send current control and enable signals to the main drive module. The microcontroller The module sets the resistance value of U5 digital potentiometer TPL0501 through SPI communication, so that the output threshold voltage can be set to match LEDs of different voltage levels; collect system ambient temperature, LED operating temperature, and real-time output voltage; communicate with external control equipment, Receive signals from external control devices or feed back system ambient temperature, LED operating temperature, and real-time output voltage.

Please refer to Figure 5. The step-down module uses a step-down chip, the model of which is AMS1117-3.3, which is used to convert the input 5V voltage to 3.3V to supply power for the microcontroller U2 and U5 digital potentiometer TPL0501.

Please refer to Figure 6. The temperature acquisition module includes P4 and P6. P4 is connected to R15 and R16, and P6 is connected to R11 and R12. The 10kΩ NTC resistor and R15 form a voltage divider circuit. When the NTC resistor connected to P4 is affected by the temperature resistance When changing, the voltage at the right end of R16 (input to the microcontroller U2) changes according to the principle of voltage division, and the microcontroller U2 collects this voltage V _ADC5 through the ADC, calculates the resistance value R _NTC of the NTC at this time according to the formula, and then uses the query Table method (find the table corresponding to temperature and NTC resistance value) to get the temperature information at this time. The ambient temperature acquisition process is the same.

Please refer to Figure 7. The communication module includes microcontroller U3, TVS diode D3 and P3. Microcontroller U3 adopts Modbus protocol to communicate and exchange data. Pin U3-10 is connected to the serial port sending end of microcontroller U2. U3- The 12 pins are connected to the serial port receiving end of the microcontroller U2, and the U3 model is MAX3232EEAE, which converts the logic signal level of the microcontroller and the level of RS232. data. The microcontroller uses 3.3V TTL level serial port communication, while RS232 is a negative logic level, which defines +3~+15V as low level, and -15~-3V as high level, RS232 serial port RX and TX need to be level-shifted before they can be connected to the pins of the microcontroller, otherwise the high voltage is likely to burn the microcontroller;

J1 is the RS232 standard interface of DB-9, D3 is a transient suppression diode (TVS), because J1 is a hardware interface connected with external control equipment, when there is high-voltage static electricity on the hardware connected to J1, it may damage the device. In the RS232 hardware circuit part of the invention, the D3 connected in parallel to the interface circuit can absorb electric energy first, so that the RS323 hardware circuit is not damaged by high-voltage static electricity.

Please refer to Figure 8, the output voltage acquisition module includes D4, D4 is connected to A4/ADC4, A4/ADC4 is connected to R17 and R18, R17 and R18 form a voltage divider circuit, A4/ADC4 is connected to the ADC acquisition pin of the microcontroller U2, D4 is a 3.3V Zener diode ZM4728, V _{VCC_OUT} is the system output voltage, and A4/ADC4 is connected to the ADC acquisition pin of the microcontroller U2. When V _{VCC_OUT} changes, according to the principle of voltage division between R17 and R18 (the voltage input to the microcontroller U2 changes, the microcontroller U2 collects this voltage V _ADC4 through the ADC, and the system V _{VCC_OUT} at this time can be calculated according to the formula The actual output voltage. D4 is a 3.3V Zener diode ZM4728, which is used to prevent the microcontroller I/O from being damaged by high voltage.

The control method of the control system:

a. Light attenuation compensation: The difference between the system ambient temperature and the LED operating temperature is recorded as the attenuation temperature. Continuously sample the system output current and attenuation temperature values during working hours. Analyze the rate of change of the attenuation temperature under the same current for a period of time. If the rate of change continues to increase, it is judged that the LED has light attenuation and the current is increased.

I=I ₁ +ΔI

I is the actual output current; I ₁ is the target current; ΔI is the compensation current. Because of the light attenuation, when only the target current is directly output, the actual light intensity is not the target intensity (although the current has reached, but some energy is converted into heat energy), increase the compensation current ΔI;

b. Program linearity correction: Because the control signal to the main drive circuit is an analog voltage of 0-1.5V, the corresponding output current is 0-20A, but the actual output current is not according to the following formula.

flow:

In the actual situation, the analog signal voltage and output current are non-linear correspondence, and the program is used for linear correction to achieve a linear correspondence between the 0-1.5V analog signal voltage and the 0-20A actual output current;

c. Modbus communication control: The system uses the Modbus communication protocol when communicating with external control equipment. When the external control equipment sends a control signal to the system, the microcontroller first analyzes the signal, extracts control information, and then controls the main computer. The drive circuit, while the microcontroller responds to the external control equipment through the communication protocol to collect the collected system ambient temperature, LED operating temperature and real-time output voltage.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. A high-power LED drive control system with light attenuation compensation for digital communication, characterized in that: it includes a main drive module, and the main drive module is electrically connected with a MOS switch and a microcontroller module, and the MOS switch passes through a step-down The module is electrically connected to the main power supply, the MOS switch is electrically connected to the output voltage acquisition module, the output voltage acquisition module is electrically connected to the LED module, and the electrical module between the output voltage acquisition module and the main drive module is actively driven A temperature acquisition module is electrically connected between the module and the microcontroller module, the microcontroller module is electrically connected to a communication module, and the communication module is electrically connected to an external control device. 2. A digital communication high-power LED drive control system with light attenuation compensation according to claim 1, characterized in that: the main drive module includes U1, Q1, Q2, P1, P2 and U5, the U1 adopts a fixed-frequency synchronous step-down DC/DC controller LT3741 and Q1, Q2 to form the main conversion circuit. The U5 uses a digital potentiometer TPL0501. The main drive module also includes an inductor L1, a capacitor C9, and a capacitor C10. Inductor L1, capacitor C9, and capacitor C10 form a filter circuit. 3. A digital communication high-power LED drive control system with light attenuation compensation according to claim 1, characterized in that: the microcontroller module includes a microcontroller U2, and the model is the domestic Zhaoyi Innovation GD32F350G8U6 , used to send current control and enable signals to the main drive module, and the microcontroller module sets the resistance value of the U5 digital potentiometer TPL0501 through SPI communication. 4. A digital communication high-power LED drive control system with light attenuation compensation according to claim 1, characterized in that: the step-down module adopts a step-down chip, the model of which is AMS1117-3.3, which is used to The input 5V voltage is converted to 3.3V to power the microcontroller U2 and U5 digital potentiometer TPL0501. 5. A digital communication high-power LED drive control system with light attenuation compensation according to claim 1, characterized in that: said temperature acquisition module includes P4, P6, said P4 is connected to R15, R16, said P6 connects R11 and R12. 6. A digital communication high-power LED drive control system with light attenuation compensation according to claim 1, characterized in that: the communication module includes a microcontroller U3, TVS diodes D3 and P3, the Microcontroller U3 adopts Modbus protocol to communicate and exchange data, the U3-10 pins are connected with the serial port sending end of microcontroller U2, and the U3-12 pins are connected with the serial port receiving end of microcontroller U2. 7. A digital communication high-power LED drive control system with light attenuation compensation according to claim 1, characterized in that: the output voltage acquisition module includes D4, D4 is connected to A4/ADC4, and the A4/ADC4 ADC4 is connected with R17 and R18, the R17 and R18 form a voltage divider circuit, the A4/ADC4 is connected with the ADC acquisition pin of the microcontroller U2, and the D4 is a 3.3V Zener diode ZM4728.

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