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

Digital communication high-power LED drive control system with light attenuation compensation Download PDF

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Publication number
CN115426735A
CN115426735A CN202211148439.XA CN202211148439A CN115426735A CN 115426735 A CN115426735 A CN 115426735A CN 202211148439 A CN202211148439 A CN 202211148439A CN 115426735 A CN115426735 A CN 115426735A
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module
microcontroller
voltage
control system
drive control
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Inventor
李明超
张聪
曹鹏彬
闫宽
罗强胜
陈绪兵
李晨雨
吴振亚
李立凡
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Wuhan Spike Technology Co ltd
Wuhan Institute of Technology
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Wuhan Spike Technology Co ltd
Wuhan Institute of Technology
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control

Abstract

The invention relates to an LED drive control system, in particular to a high-power LED drive control system with light attenuation compensation of digital communication, which can intelligently judge the light attenuation degree according to the actual working condition, intelligently give a circuit compensation value and avoid the weakening of the illumination intensity after a period of use; the current regulation range of 0-20A can be realized, the regulation precision can reach +/-6%, and the regulation precision of the output current can reach +/-3% when the proper input and output voltage is met; control signals sent by the control equipment can be transmitted through a Modbus protocol, and the control signals comprise current output current, output threshold voltage (aiming at different LED working voltages, different output voltage thresholds are configured by external control equipment through communication, the range can reach 6V-35V and enable signals, and system environment temperature, LED working temperature and real-time output voltage information can also be fed back to the external control equipment.

Description

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 high-power LED drive control system with light attenuation compensation for digital communication.
Background
The LED can efficiently convert electric energy into light energy, is a common light-emitting device, and is widely applied to the field of illumination. All need the LED light source can control continuous accurate change in scene such as shooting light filling, projection, plant light filling, so can with other equipment communications and can satisfy the requirement of accurate dimming very important, LED has nonlinear volt-ampere characteristic, very little voltage fluctuation will lead to very big current change to output power changes violently, but current LED light source has following problem:
1. because the illumination intensity of the LED is attenuated when the LED works for a long time, namely the illumination intensity is weakened after the LED is used for a period of time under the same power, the attenuation of the LED is more serious when the LED works for a longer time, and the attenuation compensation cannot be performed by the driving circuit according to the actual use condition (generally, the working time is calculated for compensation, but not according to the actual attenuation condition);
2. most LED driving circuits have the problem of poor expansibility, namely cannot be controlled by an upper computer or other external equipment;
3. some of the conventional LED adjustable main driving circuits claim high power, but the actual power is not high, and although the high-power main driving circuits exist, the high-power main driving circuits are not adjustable, a fixed value is generally output, and the compatibility is poor when the high-power main driving circuits are matched with fixed LED lamps.
Therefore, a high-power LED driving control system with light attenuation compensation for digital communication is needed to improve the above problems.
Disclosure of Invention
The present invention is directed to a high power LED driving control system with light attenuation compensation for digital communication, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a high-power LED drive control system of area light decay compensation of digital communication, includes main drive module, main drive module electric connection has MOS switch and microcontroller module, and the MOS switch passes through voltage reduction module and main power supply electric connection, MOS switch electric connection has output voltage collection module, and output voltage collection module electric connection has the LED module, electric module between output voltage collection module and the main drive module, electric connection has the temperature acquisition module between main drive module and the microcontroller module, microcontroller module electric connection has communication module, and communication module electric connection has external control equipment.
As a preferable scheme of the invention, the main driving module comprises U1, Q2, P1, P2 and U5, U1 is a fixed frequency synchronous buck DC/DC controller LT3741, a main conversion circuit is formed by LT3741 and MOSFETs Q1 and Q2, and an input power supply is fedThe line voltage reduction and constant current conversion are carried out, the line voltage reduction and the constant current conversion are converted into a constant current power supply for driving an LED, the main driving circuit receives enabling and DAC analog voltage signals from the microcontroller U2, and the start and stop of the main driving circuit and the magnitude of output current are controlled; the 3 pins of the LT3741 are chip power supply input pins, a constant current circuit is formed by the LT3741, the range of input Voltage (VIN) is 6-36V, the range of output voltage is VIN-2V (4-34V), the output current 20A is continuously adjustable, the 4 pins EN/UVLO are enable pins, the maximum input voltage is less than 6V, and the LT3741 can stop working when the voltage of the 4 pins is less than 1.55V in case of failure; conversely, when the voltage is 1.55-6V LT3741, the LT3741 can start to work, the 4 pin is connected with the A1I/O port of the microcontroller U2, and when A1 is set to be high level (3.3V), the main driving circuit enters a preparation working state; otherwise, the circuit stops working at a low level (0V), the 8-pin CTRL1 is an output current setting pin, the maximum input voltage is less than 2V, the normal input voltage is 0-1.5V, the corresponding output current is 0-20A, when LT3741 is enabled and a current signal exists, the main driving circuit works, the 10-pin FB pin sets an output voltage threshold value through a connected external digital potentiometer U5, and when the real-time output voltage exceeds 125% of the set voltage, the circuit triggers overvoltage protection and the main driving circuit stops outputting. The resistor connected to pin 14 RT is used to configure the main drive circuit operating frequency. The working frequency of the main driving circuit is set to be 400kHz; u5 receives the SPI communication signal from microcontroller U2 and sets up the resistance of U5 digital potentiometer to set up output voltage threshold, single channel, linear change, full resistance is 100k omega's digital potentiometer, has 256 to take a percentage. The device can be used as a three-terminal potentiometer, an internal register of the TPL0501 can use an SPI communication mode to set the resistance value, and pins 7, 1 and 8 of the device are equivalent to three pins of a common adjustable potentiometer. Setting the resistance values of the 7 pins and the 1 pin as Ra, then the resistance values of the 1 pin and the 8 pin as Rb = (100-Ra) k omega, and obtaining the feedback voltage V output to the LT3741-10 pin by the TPL0501-1 pin according to the resistance voltage division principle FB (V VCC_OUT As system output voltage) is:
Figure BDA0003854121540000031
the output voltage threshold can thus be set by changing the resistance of the digital potentiometer TPL 0501. Compared with the traditional mechanical potentiometer, the output voltage threshold value method controlled by the program is more linear, can quickly reach the desired threshold voltage, can directly change the output voltage threshold value by the program according to the voltage grade of the load LED under the condition of not changing a hardware structure, and is more convenient and higher in compatibility. SCLK of its 4 feet is SPI clock signal; 5 pin DIN MOSI (Master output slave input) data signal of input SPI; the 6-pin CS is a chip selection signal, when a plurality of slave machines are mounted on the SPI, the slave machines can be selected to communicate with by setting the level of the CS, the slave machines are defaulted to be low level, because only one slave machine exists on the SPI bus, and the 4, 5 and 6 pins of the U5 are connected with the A10, A11 and A12I/O of the microcontroller U2 for SPI data communication; the U1 adopts a fixed-frequency synchronous buck DC/DC controller LT3741, Q1 and Q2 to form a main conversion circuit, the U5 adopts a digital potentiometer TPL0501, the main driving module further comprises an inductor L1, a capacitor C9 and a capacitor C10, the inductor L1, the capacitor C9 and the capacitor C10 form a filter circuit, and ripple waves of output current and voltage are reduced;
r6 is a high-precision low-resistance current sampling resistor used for current closed-loop control. According to ohm's law U = IR and I = U/R, the output current can be obtained by measuring the voltage at two ends of R6;
the LED1 is an output indicator lamp, a resistor R7 connected in series with the LED1 is used for voltage division, the structure can also be used as a bleeder circuit, and when a load is disconnected, the bleeder circuit can discharge the electric energy stored in the capacitors C9 and C10;
the power supply P1 and the power supply P2 are power supply input and output interfaces respectively, and a plurality of pin headers are connected in parallel, so that the power supply P can bear rated current and can be conveniently connected with other equipment.
As a preferable scheme of the invention, the microcontroller module comprises a microcontroller U2, the model of the microcontroller is domestic mega easy innovation GD32F350G8U6, and the microcontroller module is used for sending current control and enabling signals to the main driving module, and the microcontroller module sets the resistance value of a U5 digital potentiometer TPL0501 in a SPI communication mode, so that output threshold voltage can be set to match LEDs with different voltage grades; collecting system environment temperature, LED working temperature and real-time output voltage; and the LED driving circuit is communicated with external control equipment, and receives signals of the external control equipment or feeds back the ambient temperature of the system, the working temperature of the LED and the real-time output voltage.
As a preferable scheme of the invention, the voltage reduction module adopts a voltage reduction chip, which is of model number AMS1117-3.3, and is used for converting an input 5V voltage into 3.3V and supplying power to the microcontroller U2 and the U5 digital potentiometer TPL 0501. .
As a preferable scheme 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 a voltage division circuit is formed by the NTC resistor of 10k Ω and R15, when the NTC resistor connected to the P4 is changed due to a temperature resistance value, a voltage at the right end (input to the microcontroller U2) of the R16 is changed according to a voltage division principle, and the microcontroller U2 acquires the voltage V through the ADC ADC5 Calculating the resistance R of the NTC at the moment according to a formula NTC And then, a table look-up method (a table corresponding to the temperature and the NTC resistance value is searched) is used for obtaining the temperature information at the moment. The same applies to the ambient temperature collection process.
Figure BDA0003854121540000041
As a preferable scheme of the invention, the communication module comprises a microcontroller U3, transient suppression diodes D3 and P3, the microcontroller U3 adopts Modbus protocol communication to exchange data, pins U3-10 are connected with a serial port sending end of the microcontroller U2, pins U3-12 are connected with a serial port receiving end of the microcontroller U2, the type of U3 is MAX3232EEAE to mutually convert the logic signal level of the microcontroller and the RS232 level, and the invention is connected with external control equipment through RS232 and uses Modbus protocol communication to exchange data. The microcontroller uses 3.3V TTL level serial port communication, RS232 is a negative logic level, which defines + 3- +15V as a low level and-15- + 3V as a high level, RX and TX of the RS232 serial port can be connected to pins of the microcontroller only through level conversion, otherwise, the microcontroller is likely to be burnt out by the high voltage;
j1 is an 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 high-voltage static electricity exists on hardware connected with J1, the RS232 hardware circuit part of the invention can be damaged, and D3 connected in parallel with the interface circuit can absorb electric energy firstly, so that the RS323 hardware circuit is not damaged by the high-voltage static electricity.
As a preferable scheme of the invention, the output voltage acquisition module comprises D4, the D4 is connected with A4/ADC4, the A4/ADC4 is connected with R17 and R18, the R17 and R18 form a voltage division circuit, the A4/ADC4 is connected with an ADC acquisition pin of the microcontroller U2, and the D4 is a 3.3V voltage stabilizing diode ZM4728, V VCC_OUT The A4/ADC4 is connected with an ADC acquisition pin of the microcontroller U2 for outputting voltage. When V is VCC_OUT When the voltage changes, the voltage V is acquired by the microcontroller U2 through the ADC according to the voltage division principle between the R17 and the R18 (the voltage input to the microcontroller U2 changes) ADC4 The system V at the moment can be calculated according to a formula VCC_OUT The actual output voltage of. D4 is a 3.3V zener diode ZM4728 used to protect microcontroller I/O from high voltages.
Compared with the prior art, the invention has the beneficial effects that:
1. the intelligent light attenuation degree judging device can intelligently judge the light attenuation degree according to the actual working condition, intelligently give out a circuit compensation value, and avoid that the illumination intensity is weakened after the intelligent light attenuation degree judging device is used for a period of time;
2. according to the invention, a control signal sent by control equipment is transmitted through a Modbus protocol, wherein the control signal comprises the current output current, the output threshold voltage (aiming at different LED working voltages, different output voltage thresholds are configured by external control equipment through communication, the range can reach 6V-35V and an enabling signal, and the system environment temperature, the LED working temperature and the real-time output voltage information can also be fed back to the external control equipment;
3. the invention can realize the maximum 680W power output, the adjustment range of the current 0-20A, the adjustment precision can reach +/-6%, when the proper input and output voltage is met, the adjustable precision of the output current can reach +/-3%, and the compatibility is high.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a circuit diagram of the main driving module of the present invention;
FIG. 4 is a circuit diagram of a microcontroller module according to the present invention;
FIG. 5 is a circuit diagram of the buck chip of the present invention;
FIG. 6 is a circuit diagram of a temperature acquisition module of the present invention;
FIG. 7 is a circuit diagram of a communication module according to 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 with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. 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 the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-8, the present invention provides a technical solution:
an embodiment, please refer to fig. 1-8, a high-power LED driving control system with light attenuation compensation for digital communication, includes a main driving module electrically connected to a MOS switch and a microcontroller module, the MOS switch is electrically connected to a main power source through a voltage reduction module, the MOS switch is electrically connected to an output voltage acquisition module, the output voltage acquisition module is electrically connected to a LED module, an electrical module between the output voltage acquisition module and the main driving module, a temperature acquisition module is electrically connected between the main driving 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.
Referring to fig. 3, the main driving module includes U1, Q2, P1, P2 and U5, U1 adopts a fixed frequency synchronous buck DC/DC controller LT3741, Q1 and Q2 to form a main conversion circuit, U5 adopts a digital potentiometer TPL0501, the main driving module further includes an inductor L1, a capacitor C9 and a capacitor C10, the inductor L1, the capacitor C9 and the capacitor C10 form a filter circuit, the input power is subjected to buck and constant current conversion and converted into a constant current power supply for driving the LED, the main driving circuit receives enable and DAC analog voltage signals from the microcontroller U2, and controls the start and stop of the main driving circuit and the magnitude of output current; the 3 pins of the LT3741 are chip power supply input pins, a constant current circuit is formed by the LT3741, the range of input Voltage (VIN) is 6-36V, the range of output voltage is VIN-2V (4-34V), the output current 20A is continuously adjustable, the 4 pins EN/UVLO are enable pins, the maximum input voltage is less than 6V, and the LT3741 can stop working when the voltage of the 4 pins is less than 1.55V in case of failure; on the contrary, when the voltage is 1.55-6V LT3741, the LT3741 is enabled to start to work, the 4 pin is connected with the A1I/O port of the microcontroller U2, and the main driving circuit enters a preparation working state when A1 is set to be high level (3.3V); otherwise, the operation is stopped at low level (0V),the 8-pin CTRL1 is an output current setting pin, the maximum input voltage is less than 2V, the normal input voltage is 0-1.5V, the corresponding output current is 0-20A, when LT3741 is enabled and a current signal exists, the main driving circuit works, the 10-pin FB pin sets an output voltage threshold value through a connected external digital potentiometer U5, when the real-time output voltage exceeds 125% of the set voltage, the circuit triggers overvoltage protection, and the main driving circuit stops outputting. The resistor connected to the 14-pin RT is used to configure the main drive circuit operating frequency. The working frequency of the main driving circuit is set to be 400kHz; u5 receives the SPI communication signal from microcontroller U2 and sets up the resistance of U5 digital potentiometer to set up output voltage threshold, single channel, linear change, full resistance is 100k omega's digital potentiometer, has 256 to take a percentage. The device may be implemented as a three terminal potentiometer, and the internal register of TPL0501 may be set to its resistance using SPI communication. Pins 7, 1 and 8 of the adjustable potentiometer are equivalent to three pins of a common adjustable potentiometer, the resistance values of the pin 7 and the pin 1 are set to be Ra, the resistance values of the pin 1 and the pin 8 are Rb = (100-Ra) k omega, and the feedback voltage V output from the pin TPL0501-1 to the pin LT3741-10 can be obtained according to the resistance voltage division principle FB (V VCC_OUT Is the system output voltage) is:
Figure BDA0003854121540000081
the output voltage threshold can thus be set by varying the resistance of the digital potentiometer TPL 0501. Compared with the traditional mechanical potentiometer, the output voltage threshold value method controlled by the program is more linear, can quickly reach the desired threshold voltage, can directly change the output voltage threshold value by the program according to the voltage grade of the load LED under the condition of not changing a hardware structure, and is more convenient and higher in compatibility. SCLK at its 4 feet is SPI clock signal; 5 pin DIN input SPI MOSI (master output slave input) data signal; the 6-pin CS is a chip selection signal, when a plurality of slave machines are mounted on the SPI, the slave machines can be selected to communicate with by setting the level of the CS, the slave machines are defaulted to be low level, only one slave machine exists on the SPI bus, and the 4, 5 and 6 pins of the U5 and the A10, A11 and A12I/O of the microcontroller U2 are connected for SPI data communication; the U1 adopts a fixed-frequency synchronous buck DC/DC controller LT3741, Q1 and Q2 to form a main conversion circuit, the U5 adopts a digital potentiometer TPL0501, the main driving module further comprises an inductor L1, a capacitor C9 and a capacitor C10, the inductor L1, the capacitor C9 and the capacitor C10 form a filter circuit, and ripple waves of output current and voltage are reduced;
and R6 is a high-precision low-resistance current sampling resistor used for current closed-loop control. According to ohm's law U = IR, I = U/R, the voltage of two ends of R6 is measured to obtain the output current;
the LED1 is an output indicator lamp, a resistor R7 connected in series with the LED1 is used for voltage division, the structure can also be used as a bleeder circuit, and when a load is disconnected, the bleeder circuit can discharge the electric energy stored in the capacitors C9 and C10;
the power supply P1 and the power supply P2 are power supply input and output interfaces respectively, and a plurality of pin headers are connected in parallel, so that the power supply P can bear rated current and can be conveniently connected with other equipment.
Referring to fig. 4, referring to fig. 1, 2 and 3, the microcontroller module includes a microcontroller U2, and the model is domestic mega easy innovation GD32F350G8U6, and is used for sending current control and enabling signals to the main driving module, and the microcontroller module sets the resistance value of the U5 digital potentiometer TPL0501 through SPI communication, so that the output threshold voltage can be set to match LEDs of different voltage levels; collecting system environment temperature, LED working temperature and real-time output voltage; and the LED driving circuit is communicated with external control equipment, and receives signals of the external control equipment or feeds back the ambient temperature of the system, the working temperature of the LED and the real-time output voltage.
Referring to fig. 5, the voltage dropping module adopts a voltage dropping chip, which is model number AMS1117-3.3, for converting an input 5V voltage into 3.3V to supply power to the microcontroller U2 and the U5 digital potentiometer TPL 0501.
Referring to fig. 6, the temperature acquisition module includes P4 and P6, where P4 is connected to R15 and R16, P6 is connected to R11 and R12, and the NTC resistor connected to P4 and R15 form a voltage divider circuit, and when the NTC resistor connected to P4 is changed in resistance due to temperature, the NTC resistor is input to the microcontroller U2 at the right end of R16 according to the voltage divider principleThe voltage changes, and the microcontroller U2 collects the voltage V through the ADC ADC5 Calculating the resistance R of the NTC according to a formula NTC And then using a table look-up method (searching a table corresponding to the temperature and the NTC resistance value) to obtain the temperature information at the moment. The ambient temperature collection process is the same.
Figure BDA0003854121540000101
Referring to fig. 7, the communication module includes a microcontroller U3, transient suppression diodes D3 and P3, the microcontroller U3 exchanges data by Modbus protocol communication, pins U3-10 are connected to a serial port transmitting terminal of the microcontroller U2, pins U3-12 are connected to a serial port receiving terminal of the microcontroller U2, the type of U3 is MAX3232EEAE to interconvert logic signal level of the microcontroller and RS232 level, and the present invention is connected to an external control device by RS232 to exchange data by Modbus protocol communication. The microcontroller uses 3.3V TTL level serial port communication, RS232 is a negative logic level, which defines + 3- +15V as a low level and-15- + 3V as a high level, RX and TX of the RS232 serial port can be connected to pins of the microcontroller only through level conversion, otherwise, the microcontroller is likely to be burnt out by the high voltage;
j1 is an 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 high-voltage static electricity exists on hardware connected with J1, the RS232 hardware circuit part of the invention can be damaged, and D3 connected in parallel with the interface circuit can absorb electric energy firstly, so that the RS323 hardware circuit is not damaged by the high-voltage static electricity.
Referring to fig. 8, the output voltage collecting module includes D4, D4 is connected to A4/ADC4, the A4/ADC4 is connected to R17 and R18, the R17 and R18 form a voltage dividing circuit, the A4/ADC4 is connected to an ADC collecting pin of the microcontroller U2, D4 is a 3.3V zener diode ZM4728, V VCC_OUT The A4/ADC4 is connected with an ADC acquisition pin of the microcontroller U2 for outputting voltage. When V is VCC_OUT When the voltage changes, the voltage V is acquired by the microcontroller U2 through the ADC according to the voltage division principle between the R17 and the R18 (the voltage input to the microcontroller U2 changes) ADC4 The system V at the moment can be calculated according to a formula VCC_OUT The actual output voltage of (c). D4 is a 3.3V zener diode ZM4728 used to protect microcontroller I/O from high voltages.
The control method of the control system comprises the following steps:
a. and (3) light attenuation compensation: the difference between the ambient temperature of the system and the operating temperature of the LEDs is recorded as the decay temperature. And continuously sampling the output current and the attenuation temperature value of the system in the working time. And analyzing the change rate of the attenuation temperature under the same current for a period of time, and if the change rate continuously increases, judging that the LED generates illumination attenuation and then increasing the current.
I＝I 1 +ΔI
I is the actual output current; i is 1 Is a target current; Δ I is the compensation current. Because of illumination attenuation, when only the target current is directly output, the actual illumination intensity is not the target intensity (although the current has already reached, part of the energy is converted into heat energy), and the compensation current Δ I is increased;
b. and (3) program linear correction: since the control signal to the main driving circuit is an analog voltage of 0-1.5V, corresponding to an output current of 0-20A, but the actual output current does not perform the output according to the following formula
Flow:
Figure BDA0003854121540000111
under the actual condition, the analog signal voltage and the output current are in a nonlinear corresponding relation, and linear correction is carried out by using a program to achieve the linear corresponding relation between the analog signal voltage of 0-1.5V and the actual output current of 0-20A;
modbus communication control: the system adopts a Modbus communication protocol when communicating with external control equipment, when the external control equipment sends a control signal to the system, the microcontroller firstly analyzes the signal, extracts control information, controls the main drive circuit and simultaneously reflects the acquired system environment temperature, LED working temperature and real-time output voltage to the external control equipment through the communication protocol.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a high-power LED drive control system of area light decay compensation of digital communication which characterized in that: including the main drive module, main drive module electric connection has MOS switch and microcontroller module, and the MOS switch passes through voltage reduction module and main power supply electric connection, MOS switch electric connection has output voltage acquisition module, and output voltage acquisition module electric connection has the LED module, electric module between output voltage acquisition module and the main drive module, electric connection has the temperature acquisition module between main drive module and the microcontroller module, microcontroller module electric connection has communication module, and communication module electric connection has external control equipment.
2. The digitally-communicated high-power LED drive control system with optical attenuation compensation according to claim 1, wherein: the main driving module comprises a U1, a Q2, a P1, a P2 and a U5, the U1 adopts a fixed-frequency synchronous buck DC/DC controller LT3741 to form a main conversion circuit with the Q1 and the Q2, the U5 adopts a digital potentiometer TPL0501, the main driving module further comprises an inductor L1, a capacitor C9 and a capacitor C10, and the inductor L1, the capacitor C9 and the capacitor C10 form a filter circuit.
3. The digital communication high-power LED drive control system with optical attenuation compensation as claimed in claim 1, wherein: the microcontroller module comprises a microcontroller U2, the model of the microcontroller module is domestic megaly easy-to-innovate GD32F350G8U6 and is used for sending current control and enabling signals to the main driving module, and the microcontroller module is used for setting the resistance value of the U5 digital potentiometer TPL0501 in an SPI communication mode.
4. The digital communication high-power LED drive control system with optical attenuation compensation as claimed in claim 1, wherein: the voltage reduction module adopts a voltage reduction chip, is AMS1117-3.3 in model number, and is used for converting input 5V voltage into 3.3V to supply power for the microcontroller U2 and the U5 digital potentiometer TPL 0501.
5. The digitally-communicated high-power LED drive control system with optical attenuation compensation according to claim 1, wherein: the temperature acquisition module comprises P4 and P6, wherein the P4 is connected with R15 and R16, and the P6 is connected with R11 and R12.
6. The digital communication high-power LED drive control system with optical attenuation compensation as claimed in claim 1, wherein: the communication module comprises a microcontroller U3, transient suppression diodes D3 and P3, the microcontroller U3 adopts Modbus protocol communication to exchange data, pins U3-10 are connected with a serial port sending end of the microcontroller U2, and pins U3-12 are connected with a serial port receiving end of the microcontroller U2.
7. The digital communication high-power LED drive control system with optical attenuation compensation as claimed in claim 1, wherein: the output voltage acquisition module comprises a D4, the D4 is connected with an A4/ADC4, the A4/ADC4 is connected with R17 and R18, the R17 and R18 form a voltage division circuit, the A4/ADC4 is connected with an ADC acquisition pin of a microcontroller U2, and the D4 is a 3.3V voltage stabilizing diode ZM4728.
CN202211148439.XA 2022-09-20 2022-09-20 Digital communication high-power LED drive control system with light attenuation compensation Pending CN115426735A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116930671A (en) * 2023-09-19 2023-10-24 成都光创联科技有限公司 Circuit and method for testing performance of current-driven optical device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116930671A (en) * 2023-09-19 2023-10-24 成都光创联科技有限公司 Circuit and method for testing performance of current-driven optical device
CN116930671B (en) * 2023-09-19 2023-11-21 成都光创联科技有限公司 Circuit and method for testing performance of current-driven optical device

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