Multi-channel decoding driving circuit based on DMX512 communication protocol, and lamp and package body therefor

Abstract

The present invention relates to the technical field of lighting driving. Disclosed are a multi-channel decoding driving circuit based on a DMX512 communication protocol, and a lamp and a package body therefor. The driving circuit comprises an address input / output protection circuit, an anti-reverse step-down filtering direct current circuit, a differential signal conversion circuit, and a plurality of step-down constant current dimming driving circuits; the address input / output protection circuit is electrically connected to a decoding control module; a signal reading end of the decoding control module is electrically connected to a signal output end of the differential signal conversion circuit; the decoding control module is provided with a plurality of PWM output ends; the plurality of PWM output ends are correspondingly electrically connected to the step-down constant current dimming driving circuits; the decoding control module sends an electrical signal to the step-down constant current dimming driving circuits by means of the PWM output ends; and the anti-reverse step-down filtering direct current circuit can provide a high direct current working voltage and a low direct current working voltage. The present invention meets the constant current output requirements and engineering requirements of multi-primary-color LED lamps, and can reduce the number of electronic components used.

Description

Multi-channel decoding driving circuit based on DMX512 communication protocol, lamp and packaging body thereof

[0001] The present application claims priority from Chinese Patent Application No. 2024108409301, filed on June 27, 2024. The present application incorporates the entire disclosure of the above-mentioned Chinese Patent Application. TECHNICAL FIELD

[0002] The present application relates to the field of lighting driving, in particular to a multi-channel decoding driving circuit based on DMX512 communication protocol, a lamp and a packaging body thereof. BACKGROUND

[0003] With the development of science and technology and the improvement of economic level, people's demand for spiritual and cultural needs is increasing, and the diversification and colorization of lamps and lanterns also emerge in more and more occasions. Lamps and lanterns are not only an indispensable tool in people's daily life, but also appear in front of the masses as a form of urban light beautification products, giving the masses more spiritual enjoyment and visual impact.

[0004] Multi-primary color LED lamps can adjust different lighting modes according to different use scenarios, such as adjusting to low color temperature mode for a warm atmosphere, and adjusting to high color temperature for concentrated work.

[0005] In the currently mass-produced LED lamps, due to the superimposed effects of factors such as the delay of the internal circuit of the constant current driving chip, the difference of the input voltage, the difference of the resistance value of the sampling resistor, and the decrease of the LED on-voltage after the LED is lighted, the current output by the constant current driving chip is not constant. This leads to that the loop currents of the same color LEDs of different lamps in the same batch of multi-primary color LED light sources are not completely consistent when driven by the same batch of multi-channel constant current driving power supply. The spectral differences of different multi-primary color LED lamps are large, and the light colors of different multi-primary color LED lamps will also have large differences in the same lighting mode. When the same batch of multi-primary color LED lamps are used in the same lighting place, the light color differences between different lamps will bring bad experience and observation.

[0006] To solve the above technical defects, the patent application publication number: CN 115633423 A provides a current control circuit and control method for multi-primary color LED lamp, which discloses a current control circuit including a multi-channel current detection module, a multi-channel constant current drive module, and a drive control module. The multi-channel current detection module includes a multi-channel current conversion amplification unit and a current sampling control unit. The multi-channel current conversion amplification unit converts the multi-channel current signal into a multi-channel voltage signal and amplifies it. The current sampling control unit collects and converts the multi-channel voltage signal into a current value, which is sent to the drive control module. The drive control module internally stores the function relationship between the loop current of each primary color LED and the corresponding PWM wave duty cycle, the target current of each loop of the multi-primary color LED lamp under specific light color, and the PID control algorithm program. The drive control module controls the loop current of each primary color LED of the multi-channel constant current drive module to track the set target current, which can effectively reduce the light color difference between the lamps caused by the inconsistency of the driving current among the same batch of multi-primary color LED lamps.

[0007] The above disclosed patent application technical solution can improve the color difference problem of multi-primary color LED lamps caused by inconsistent current, but it also introduces new technical problems:

[0008] First, to achieve the purpose of consistent current output, the multi-channel current conversion amplification unit and the current sampling control unit are introduced to realize PID closed-loop control. However, due to the objective factors of the multi-channel current conversion amplification unit and the current sampling control unit being greatly affected by temperature, the amplification factor and precision of the amplification unit will be disturbed, which is not conducive to the realization of consistent current output. Moreover, for multi-primary color LED lamps, the addition of the multi-channel current conversion amplification unit and the current sampling control unit will greatly increase the manufacturing cost.

[0009] Second, the drive control module, multi-channel constant current drive module, and multi-primary color LED light source require stable constant voltage +5V and +36V, etc. However, the above technical solution does not have circuit design protection measures for the input end of the power supply to prevent surge and reverse connection, nor does it perform hierarchical output of the DC voltage for power supply. This requires separate design of different voltage source circuits for output power supply, which not only increases the cost of circuit components and design, but also reduces the safety of the power supply circuit, making it prone to damage. In addition, the above technical solution does not mention the anti-surge and signal denoising technology for the address input and output of the drive control module and the differential signal input. However, anti-surge and signal denoising are crucial for multi-channel constant current stable driving.

[0010] Three, due to different base color LED lamp beads, with different color temperature and color, so that the corresponding lamp has a variety of state changes, color or color temperature display more diverse, however, prior art only provides four primary constant current drive, its mixed color effect or adjustable mixed color space is limited, greatly limits the adjustable mixed color light source, mixed color is single, can not meet the demand of city light beautification lighting.

[0011] Therefore, it is urgent to provide a multi-channel decoding driving circuit based on DMX512 communication protocol, a lamp and an encapsulation thereof which overcome the above problems.

[0012] SUMMARY

[0013] In view of the problems in the prior art, the application provides a multi-channel decoding driving circuit based on DMX512 communication protocol, a lamp and an encapsulation thereof. After the multi-channel decoding driving circuit, the lamp and the encapsulation thereof are used, on the one hand, the multi-channel current conversion amplification unit and the current sampling control unit in the prior art are abandoned. Under the condition that the objective condition that the human eye cannot perceive within ±3% color difference is ensured, the application directly supplies constant current by using a step-down constant current dimming driving circuit, so that the LED lamp bead color difference caused by slight current fluctuation can fall within the ±3% color difference range. This not only meets the demand of constant current output of multi-primary color LED lamps, but also meets the actual engineering demand, reduces the number of electronic components required in the circuit, greatly reduces the manufacturing cost, and on the contrary, avoids the interference on the amplification multiple and precision of the amplification unit caused by the introduction of the multi-channel current conversion amplification unit and the current sampling control unit due to temperature, which is not conducive to the consistency of current output.

[0014] In another aspect, the address input and output protection circuit, the reverse connection prevention and voltage reduction filter DC circuit and the differential signal conversion circuit are provided, the address input and output protection circuit is electrically connected with the decoding control module, the signal reading end of the decoding control module is electrically connected with the signal output end of the differential signal conversion circuit, the reverse connection prevention and voltage reduction filter DC circuit comprises a reverse connection prevention filter sub-circuit and a voltage reduction filter sub-circuit connected in sequence, the reverse connection prevention filter sub-circuit can provide DC working high voltage for the several voltage reduction constant current light adjustment driving circuits, the voltage reduction filter sub-circuit can provide DC working low voltage for the address input and output protection circuit, the differential signal conversion circuit and the several voltage reduction constant current light adjustment driving circuits, and can provide stable constant DC low voltage +5V and DC high voltage +36V for the decoding control module, the voltage reduction constant current light adjustment driving circuit, the differential signal conversion circuit and the LED lamp bead, thereby realizing the hierarchical output of DC voltage, reducing the circuit components and design cost, improving the safety of the power supply circuit, preventing damage, and improving the signal surge prevention and reverse connection prevention of the address input and output of the decoding control module and the signal denoising technology during differential signal input.

[0015] In addition, the decoding control module is provided with a plurality of PWM output ends, the plurality of PWM output ends are electrically connected with the voltage reduction constant current light adjustment driving circuit, and the decoding control module can send PWM electrical signals to the voltage reduction constant current light adjustment driving circuit through the PWM output end, so that the voltage reduction constant current light adjustment driving circuit can drive the LED lamp bead to turn on and off.

[0016] To solve the above technical problems, the technical scheme adopted by the present application is:

[0017] The application provides a multi-channel decoding driving circuit based on a DMX512 communication protocol, which comprises an address input and output protection circuit, an anti-reverse connection voltage reduction filter direct current circuit, a differential signal conversion circuit electrically connected with the anti-reverse connection voltage reduction filter direct current circuit and a plurality of voltage reduction constant current dimming driving circuits electrically connected with the anti-reverse connection voltage reduction filter direct current circuit, the address input and output protection circuit is electrically connected with a decoding control module, a signal reading end of the decoding control module is electrically connected with a signal output end of the differential signal conversion circuit, the decoding control module is provided with a plurality of PWM output ends, the plurality of PWM output ends are correspondingly electrically connected with the voltage reduction constant current dimming driving circuits, the decoding control module can send PWM electric signals to the voltage reduction constant current dimming driving circuits through the PWM output ends, so that the voltage reduction constant current dimming driving circuits can drive LED lamp beads to be bright or dark, the anti-reverse connection voltage reduction filter direct current circuit comprises an anti-reverse connection filter sub-circuit and a voltage reduction filter sub-circuit connected in sequence, the anti-reverse connection filter sub-circuit can provide direct current working high voltage for the plurality of voltage reduction constant current dimming driving circuits, and the voltage reduction filter sub-circuit can provide direct current working low voltage for the address input and output protection circuit, the differential signal conversion circuit and the plurality of voltage reduction constant current dimming driving circuits; the PWM output ends, the voltage reduction constant current dimming driving circuits and the LED lamp beads are all provided with at least seven, and the primary colors of each LED lamp bead are different.

[0018] The above technical scheme has the advantages that: on the one hand, the application discards the multi-channel current conversion amplification unit and the current sampling control unit in the prior art; under the condition of ensuring that the human eye cannot perceive the objective situation within ±3% color difference, the application directly supplies constant current by adopting the voltage reduction constant current dimming driving circuit, so that the LED lamp bead color difference caused by slight current fluctuation can fall within the ±3% color difference range, which not only meets the demand of constant current output of multi-primary-color LED lamps, but also meets the actual engineering demand, reduces the demand quantity of electronic components in the circuit, greatly reduces the manufacturing cost, and on the contrary, can also avoid the interference on the amplification multiple and precision of the amplification unit caused by the introduction of the multi-channel current conversion amplification unit and the current sampling control unit due to temperature, which is not conducive to the consistency of current output.

[0019] In another aspect, the application is provided with address input and output protection circuit, anti-reverse connection voltage reduction filter DC circuit and differential signal conversion circuit, the address input and output protection circuit is electrically connected with the decoding control module, the signal reading end of the decoding control module is electrically connected with the signal output end of the differential signal conversion circuit, the anti-reverse connection voltage reduction filter DC circuit comprises an anti-reverse connection filter sub-circuit and a voltage reduction filter sub-circuit connected in sequence, the anti-reverse connection filter sub-circuit can provide DC working high voltage for a plurality of voltage reduction constant current light adjustment driving circuits, the voltage reduction filter sub-circuit can provide DC working low voltage for the address input and output protection circuit, the differential signal conversion circuit and the plurality of voltage reduction constant current light adjustment driving circuits, and can provide stable constant DC low voltage +5V and DC high voltage +36V for the decoding control module, the voltage reduction constant current light adjustment driving circuit, the differential signal conversion circuit and the LED lamp bead, realizing the hierarchical output of DC voltage, without the need to separately design circuits of different voltage grades to output power supply, reducing the investment of circuit components and design cost, and at the same time, the input end of the power supply is protected by the circuit design measures of anti-surge and anti-reverse connection, improving the safety of the power supply circuit and being not easy to be damaged, in addition, the anti-surge technology processing of the address input and output of the decoding control module and the signal denoising technology processing during differential signal input play a positive role in multi-channel constant current stable driving.

[0020] In addition, the decoding control module of the application is provided with a plurality of PWM output ends, the plurality of PWM output ends are correspondingly electrically connected with the voltage reduction constant current light adjustment driving circuit, the decoding control module can send PWM electrical signals to the voltage reduction constant current light adjustment driving circuit through the PWM output end, so that the voltage reduction constant current light adjustment driving circuit can drive the LED lamp bead to turn on and off, here, the PWM output end, the voltage reduction constant current light adjustment driving circuit and the LED lamp bead are all provided with at least seven, and the primary color of each LED lamp bead is different, that is, the LED lamp of the application has seven LED lamp beads with different primary colors, and the seven LED lamp beads with different primary colors have different color temperatures and colors, so that the corresponding lamp has a variety of change states, the color or color temperature display is more diverse, under the driving action of the voltage reduction constant current light adjustment driving circuit, the mixed color effect or adjustable mixed color space is larger, the adjustability of the mixed color light source is greatly played, the mixed color is more diverse, a wider color gamut area is realized, the color gamut coverage is larger, the color temperature range of the mixed white light is wider, the quality is better, and the spectrum of the mixed white light can realize full-spectrum white light, which can meet the demand of city light beautification lighting.

[0021] In order to solve the technical problems, the further technical solutions adopted by the application are:

[0022] Optionally, the multi-channel decoding drive circuit, wherein the anti-reverse connection filter sub-circuit comprises a first lightning protection diode connected in parallel to the power input end, a first anti-reverse connection P-channel MOS tube and a second anti-reverse connection P-channel MOS tube electrically connected with the first lightning protection diode, a first resistor, a second resistor, a first capacitor, a second capacitor and a third capacitor connected in parallel and grounded, the first anti-reverse connection P-channel MOS tube and the second anti-reverse connection P-channel MOS tube have a common drain and a common gate, the first resistor is electrically connected between the source and the gate of the first anti-reverse connection P-channel MOS tube and the second anti-reverse connection P-channel MOS tube, one end of the second resistor is electrically connected with the first resistor, and the other end of the second resistor is grounded.

[0023] The step-down filter sub-circuit comprises a step-down chip, a fourth capacitor and a fifth capacitor electrically connected with a 1 pin of the step-down chip, and the fourth capacitor and the fifth capacitor are connected in parallel and grounded; the step-down filter sub-circuit further comprises a first energy storage inductor and a first diode electrically connected with a 2 pin of the step-down chip, a first voltage feedback resistor electrically connected with a 3 pin of the step-down chip, a second voltage feedback resistor and a sixth capacitor, the sixth capacitor is connected in parallel with the first voltage feedback resistor, the first energy storage inductor is further electrically connected with a seventh capacitor, an eighth capacitor, a first voltage feedback resistor and a sixth capacitor, the seventh capacitor and the eighth capacitor are connected in parallel and grounded, the second voltage feedback resistor is grounded, and a 5 pin, a 6 pin, a 7 pin and an 8 pin of the step-down chip are commonly grounded.

[0024] The above technical solution takes the input voltage DC 36V as an example, connects DC 36V to the 36V+ port and the GND port of the decoding board to supply power to the lamp decoding board, absorbs the start or shutdown or lightning-induced voltage of the power supply through the first lightning protection diode to protect the normal work of the lamp decoding board, obtains a relatively stable DC 36V voltage after filtering through the first anti-reverse connection P-channel MOS tube, the second anti-reverse connection P-channel MOS tube, the first resistor, the second resistor, the first capacitor, the second capacitor and the third capacitor, and then through the first voltage feedback resistor, the second voltage feedback resistor, the first diode, the sixth capacitor, the seventh capacitor and the eighth capacitor to form a current limiting and voltage stabilizing circuit, the output voltage of the step-down chip is stabilized at about DC 5V, and then the sixth capacitor, the seventh capacitor and the eighth capacitor are filtered to finally output a stable DC 5V working voltage to supply the decoding control module, the step-down constant current dimming drive circuit and the differential signal conversion circuit.

[0025] Optionally, the multi-channel decoding drive circuit, wherein the address input and output protection circuit comprises a first self-resetting fuse connected in series with a PI address input end of the decoding control module and a second self-resetting fuse connected in series with a PO address output end of the decoding control module, and the address input and output protection circuit further comprises a first surge protection diode, a third resistor, a second surge protection diode and a fourth resistor, the third resistor is electrically connected with the PI address input end, the third resistor is further electrically connected with the first self-resetting fuse and the first surge protection diode, the first surge protection diode is grounded, the fourth resistor is electrically connected with the PO address output end, the fourth resistor is further electrically connected with the second self-resetting fuse and the second surge protection diode, and the second surge protection diode is grounded.

[0026] The design of the above technical solution is that the PI port and the PO port of the decoding control module are input and output ports for address programming, the first self-resetting fuse and the second self-resetting fuse are connected to the PI and PO pins of the decoding control module through the third resistor and the fourth resistor, respectively, the first surge protection diode and the second surge protection diode (i.e. a ground pressure-sensitive protection device) are added between the first self-resetting fuse and the third resistor and between the second self-resetting fuse and the fourth resistor, so as to prevent irreversible damage to the decoding control module caused by high-voltage surges on the address line, and the decoding control module can also support online power-on encoding, which lays a foundation for functional upgrade and product iteration.

[0027] Optionally, the multi-channel decoding drive circuit, wherein the differential signal conversion circuit comprises a signal transceiver module, a first signal suppression resistor and a second signal suppression resistor connected in series with A and B pins of the signal transceiver module, a DE pin, B pin and a GND pin of the signal transceiver module are electrically connected and grounded, a VCC pin of the signal transceiver module is electrically connected with a ninth capacitor, the ninth capacitor is grounded, and a RO pin of the signal transceiver module is electrically connected with an RXD pin of the decoding control module.

[0028] The design of the above technical solution is that the DMX512 differential signal is input to the A pin and the B pin of the signal transceiver module after the scattered noise signal is reduced through the first signal suppression resistor and the second signal suppression resistor, and then the DMX512 differential signal is converted into a TTL signal by the internal circuit of the signal transceiver module and output to the RXD port of the decoding control module through the RO port, the RXD port of the decoding control module reads the input signal and converts it into a control signal after internal analysis, and the control signal controls the duty cycle of each PWM port.

[0029] Optionally, the multi-channel decoding drive circuit, wherein the VCC pin and the GND pin of the decoding control module are electrically connected with a tenth capacitor, and the GND pin of the decoding control module is electrically connected with the tenth capacitor and grounded.

[0030] The design of the above technical solution can achieve the effects of denoising, filtering and voltage stabilization on the output current and voltage by electrically connecting the tenth capacitor between the VCC pin and the GND pin of the decoding control module.

[0031] Optionally, the multi-channel decoding drive circuit, wherein the buck constant current dimming drive circuit comprises a DC-DC buck constant current dimming drive module, the 1 pin, the 2 pin, the 3 pin and the 4 pin of the DC-DC buck constant current dimming drive module are respectively electrically connected with a current limiting resistor, a signal anti-interference resistor, an eleventh capacitor and a chip sampling resistor, the 5 pin and the 6 pin of the DC-DC buck constant current dimming drive module are electrically connected, the 7 pin and the 8 pin of the DC-DC buck constant current dimming drive module are electrically connected and grounded, the 1 pin and the 3 pin of the DC-DC buck constant current dimming drive module are electrically connected, the signal anti-interference resistor is further electrically connected with a voltage pull-down resistor, the chip sampling resistor, the eleventh capacitor and the voltage pull-down resistor are all grounded, the 5 pin and the 6 pin of the DC-DC buck constant current dimming drive module are further electrically connected with a second energy storage inductor, the signal anti-interference resistor and the voltage pull-down resistor are both electrically connected with the PWM output end of the decoding control module, and the second energy storage inductor is electrically connected with the LED lamp bead.

[0032] The design of the above technical solution adopts a Buck topology structure for the buck constant current dimming drive circuit, the peripheral circuit is simple, and the efficiency is high, the 1 pin of the DC-DC buck constant current dimming drive module is powered by the DC 5V voltage through the current limiting resistor, the 3 pin is set to high level, the 2 pin is used as the input pin of the control PWM signal, the signal is subjected to anti-interference treatment through the signal anti-interference resistor, the voltage pull-down resistor is used for grounding, the port voltage of the input pin of the PWM signal is pulled down, it is ensured that the DC-DC buck constant current dimming drive module does not work when there is no PWM signal, and the size of the chip sampling resistor between the 4 pin and the ground determines the maximum output capacity of the DC-DC buck constant current dimming drive module.

[0033] The 5 pin and the 6 pin are the gate of the built-in MOS tube of the DC-DC buck constant current dimming drive module, and the second energy storage inductor is the energy storage inductor of the buck constant current dimming drive circuit, and the inductance size directly affects the working frequency of the DC-DC buck constant current dimming drive module and the conversion efficiency of the buck constant current dimming drive circuit.

[0034] Further optionally, the multi-channel decoding drive circuit, wherein the step-down constant current dimming drive circuit further comprises a freewheeling diode, the positive electrode of the freewheeling diode is electrically connected to the second energy storage inductor, and the negative electrode of the freewheeling diode is electrically connected to the direct-current working high-voltage output end of the anti-reverse connection filtering sub-circuit.

[0035] The main function of the freewheeling diode is to provide a current loop for the second energy storage inductor to continuously supply power to the load when the MOS tube gate connected with the 5th pin and the 6th pin is disconnected, so as to ensure that the step-down constant current dimming drive circuit has stable current to maintain the normal work of the LED lamp bead.

[0036] Optionally, the multi-channel decoding drive circuit, wherein the decoding control module adopts a DMX01 chip, the decoding control module is provided with seven-channel PWM output ends, the step-down constant current dimming drive circuit is provided with seven, and the seven-channel PWM output ends are electrically connected to the step-down constant current dimming drive circuit one by one.

[0037] The decoding control module controls the output of the seven-channel PWM drive signal, and each channel of the PWM drive signal is output to a plurality of groups of LED lamp beads with the same base color, so that the seven-channel PWM drive signal output can control a total of seven groups of LED lamp beads with different base colors, so that the mixed color effect of RGBWCLA seven base colors can be realized.

[0038] The application further provides a lamp, which comprises a multi-channel decoding drive circuit and a lamp panel, wherein the lamp panel is provided with a plurality of heat dissipation pads, one side of each heat dissipation pad is welded with a seven-base-color LED array, and the seven-base-color LED array comprises R base color LED lamp beads, G base color LED lamp beads, B base color LED lamp beads, W base color LED lamp beads, C base color LED lamp beads, L base color LED lamp beads and A base color LED lamp beads.

[0039] The seven-base-color LED array is composed of seven LED lamp beads with different base colors in an array form, heat is generated during light emission, and the heat is dissipated in real time through the metal heat dissipation pad, so that the LED lamp bead can be protected and damage caused by high temperature can be avoided.

[0040] In order to solve the technical problems, the further technical scheme adopted by the present application is:

[0041] Optionally, the lamp mentioned above, wherein the LED lamp beads of the same base color of each seven-base-color LED array are connected in series.

[0042] The design of the above technical scheme connects the LED lamp beads of the same base color of each seven-base-color LED array in series, which can realize that the LED lamp beads of the same base color form a single-color LED lamp string, and the lamp can form seven different base color LED lamp strings, which can execute the intermittent overall on-off work of the LED lamp strings at the same time or at different times according to the instructions of the PWM driving signal output.

[0043] In addition, the present application also proposes a packaging body applied to a multi-channel decoding driving circuit, the packaging body comprising a semi-closed shell, a circuit board with the multi-channel decoding driving circuit and a heat sink, the circuit board being arranged in the shell, the circuit board being provided with the heat sink on one side of the electronic components, the circuit board, the heat sink and the shell being filled with heat-conducting insulating glue, and an insulating gasket being arranged between the circuit board and the shell.

[0044] The design of the above technical scheme can effectively improve the heat dissipation effect because the multi-channel decoding driving circuit has high conversion efficiency, and a large amount of heat is generated in the electronic components on the multi-channel decoding driving circuit and the circuit board during long-time work. The heat is conducted to the heat sink for high-efficiency heat dissipation. In addition, the electronic components have the effects of waterproofing, heat insulation and dust prevention by filling the heat-conducting insulating glue between the circuit board, the heat sink and the shell, which can not only fix the electronic components and the circuit board but also enhance the heat dissipation capacity. The insulating gasket arranged between the circuit board and the shell can have the electrical insulation effect between the electronic components and the shell, further improve the service life of the electronic components, and improve the heat conduction and dissipation effect.

[0045] First, an aspect of the present application, abandon the prior art in the multi-channel current conversion amplification unit and current sampling control unit, in ensuring that the objective situation within ± 3% color difference, the present application adopts the constant current supplied directly by the voltage reduction constant current dimming drive circuit, so that the LED lamp bead color difference caused by the small current fluctuation can fall within the ± 3% color difference range, which not only meets the demand of constant current output of multi-primary color LED lamps, but also meets the actual engineering demand, reduces the number of electronic components required in the circuit, greatly reduces the manufacturing cost, on the contrary, it can also avoid the interference on the amplification factor and precision of the amplification unit caused by the introduction of multi-channel current conversion amplification unit and current sampling control unit affected by temperature, which is not conducive to the consistency of current output technical problems;

[0046] Second, another aspect of the present application, address input and output protection circuit, anti-reverse connection voltage reduction filter DC circuit and differential signal conversion circuit are provided, the address input and output protection circuit is electrically connected with the decoding control module, the signal reading end of the decoding control module is electrically connected with the signal output end of the differential signal conversion circuit, the anti-reverse connection voltage reduction filter DC circuit includes anti-reverse connection filter sub-circuit and voltage reduction filter sub-circuit connected in sequence, the anti-reverse connection filter sub-circuit can provide DC working high voltage for several voltage reduction constant current dimming drive circuits, the voltage reduction filter sub-circuit can provide DC working low voltage for the address input and output protection circuit, the differential signal conversion circuit and several voltage reduction constant current dimming drive circuits, which can provide stable constant DC low voltage + 5V and DC high voltage + 36V for the decoding control module, the voltage reduction constant current dimming drive circuit, the differential signal conversion circuit and the LED lamp bead, realizing the hierarchical output of DC voltage, without the need to design separate circuits of different voltage grades to output power supply, reducing the investment of circuit components and design cost, at the same time, the input end of the power supply is protected by the circuit design measures of anti-surge and anti-reverse connection, improving the safety of the power supply circuit, not easy to damage, in addition, the anti-surge technology processing of the address input and output of the decoding control module and the signal denoising technology processing when the differential signal is input, play a positive role in multi-channel constant current stable drive;

[0047] In addition, the decoding control module of the present application is provided with a plurality of PWM output terminals corresponding to the voltage reduction constant current dimming drive circuit, and the decoding control module can send PWM electrical signals to the voltage reduction constant current dimming drive circuit through the PWM output terminals, so that the voltage reduction constant current dimming drive circuit can drive the LED lamp beads to turn on and off. Here, the PWM output terminals, the voltage reduction constant current dimming drive circuit and the LED lamp beads are all provided with at least seven, and the base colors of each LED lamp bead are different, that is, the LED lamp of the present application has seven LED lamp beads with different base colors, and the seven LED lamp beads with different base colors have different color temperatures and colors, so that the corresponding lamp has a variety of change states, and the color or color temperature display is more diverse. Under the driving action of the voltage reduction constant current dimming drive circuit, the mixed color effect or the adjustable mixed color space is larger, the adjustability of the mixed color light source is greatly exerted, the mixed color is more diverse, a wider color gamut area is realized, the color gamut coverage is larger, the color temperature range of the mixed white light is wider, the quality is better, and the spectrum of the mixed white light can realize full-spectrum white light, which can meet the demand of city light beautification lighting.

[0048] Thirdly, the present application solves the problems of the prior art and achieves significant technical progress.

[0049] Firstly, the present application is aimed at a multi-channel decoding drive circuit based on DMX512 communication protocol, which solves the problems of traditional circuits in address input and output protection, anti-reverse connection voltage reduction filtering DC power supply and differential signal conversion. By introducing an address input and output protection circuit, damage to the circuit caused by abnormal address signals is effectively prevented; by designing an anti-reverse connection voltage reduction filtering DC circuit, a stable and high-quality DC working voltage is provided for the circuit, ensuring the stability and reliability of the circuit; at the same time, the differential signal conversion circuit ensures that the DMX512 differential signal can be accurately converted into a signal recognizable by the decoding control module, improving the accuracy and efficiency of signal transmission.

[0050] Secondly, the present application has made significant technical progress in the design of the decoding control module and the voltage reduction constant current dimming drive circuit. The DMX01 chip is used as the core of the decoding control module, which not only improves the output accuracy and stability of the PWM signal, but also supports up to seven channels of PWM output, meeting the dimming needs of multi-channel LED lamp beads. At the same time, the design of the voltage reduction constant current dimming drive circuit fully considers the driving characteristics of the LED lamp beads, and through accurate current control and dimming strategy, the LED lamp beads are driven efficiently and stably, and the consistency of their brightness and color is guaranteed.

[0051] Furthermore, the present application significantly improves the integration and reliability of the circuit by adopting a unique circuit design and optimized signal transmission method. By integrating multiple functional modules into one, the circuit structure is simplified and the manufacturing cost is reduced. At the same time, the optimized signal transmission method reduces signal loss and interference, improving the accuracy and stability of signal transmission. These improvements not only improve the performance and reliability of the circuit, but also enhance its applicability and reliability in various application scenarios.

[0052] Finally, the present application has made significant technical progress in the driving and control of LED lamp beads. By adopting multi-channel PWM output and precise current control strategy, precise light and color control of LED lamp beads is realized. At the same time, by optimizing the circuit design and signal transmission method, the brightness and color consistency of LED lamp beads are improved, making its application in stage lighting, landscape lighting and other fields more extensive and flexible. These technical progress not only enhances the market competitiveness of the product, but also brings better user experience. BRIEF DESCRIPTION OF DRAWINGS

[0053] FIG. 1 is a schematic diagram of the circuit architecture of an embodiment of the present application;

[0054] FIG. 2 is a schematic diagram of the electrical connection of the reverse connection prevention filter subcircuit of a preferred embodiment of the present application;

[0055] FIG. 3 is a schematic diagram of the electrical connection of the voltage reduction filter subcircuit of another preferred embodiment of the present application;

[0056] FIG. 4 is a schematic diagram of the electrical connection of the reverse connection prevention voltage reduction filter direct current circuit of another embodiment of the present application;

[0057] FIG. 5 is a schematic diagram of the electrical connection of the address input and output protection circuit of another preferred embodiment of the present application;

[0058] FIG. 6 is a schematic diagram of the electrical connection of the differential signal conversion circuit of another preferred embodiment of the present application;

[0059] FIG. 7 is a schematic diagram of the electrical connection of the voltage reduction constant current dimming driving circuit of another preferred embodiment of the present application;

[0060] FIG. 8 is a schematic diagram of the electrical connection between the voltage reduction constant current dimming driving circuits of seven-channel different base color LED lamp beads of another preferred embodiment of the present application;

[0061] FIG. 9 is a schematic diagram of the structure of a lamp of another embodiment of the present application (front view);

[0062] FIG. 10 is a schematic diagram of the structure of a lamp of another embodiment of the present application (side view);

[0063] FIG. 11 is a schematic diagram of the heat dissipation pad plane structure of a lamp of another embodiment of the present application;

[0064] Fig. 12 is a perspective structural schematic diagram of a package according to another embodiment of the present application;

[0065] Fig. 13 is a heat simulation distribution schematic diagram of a shell and a circuit board (without a heat sink, with a heat-conducting insulating adhesive, an internal view) according to another embodiment of the present application;

[0066] Fig. 14 is a heat simulation distribution schematic diagram of a shell and a circuit board (without a heat sink, with a heat-conducting insulating adhesive, an external view) according to another embodiment of the present application;

[0067] Fig. 15 is a heat simulation distribution schematic diagram of a shell and a circuit board (with a heat sink, with a heat-conducting insulating adhesive, an internal view) according to another embodiment of the present application;

[0068] Fig. 16 is a heat simulation distribution schematic diagram of a shell and a circuit board (with a heat sink, with a heat-conducting insulating adhesive, an external view) according to another embodiment of the present application.

[0069] The parts in the drawings are marked as follows: address input and output protection circuit 1, reverse connection prevention and voltage reduction filter DC circuit 2, reverse connection prevention filter sub-circuit 21, voltage reduction filter sub-circuit 22, voltage reduction chip 221, differential signal conversion circuit 3, signal transceiver module 31, voltage reduction constant current dimming drive circuit 4, DC-DC voltage reduction constant current dimming drive module 41, decoding control module 5, LED lamp bead 6, lamp panel 7, heat dissipation pad 8, seven-primary-color LED array 9, shell 100, circuit board 200, and heat sink 300. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0071] Embodiment 1

[0072] As shown in FIGS. 1-8, in one embodiment of the present application, a multi-channel decoding driving circuit based on DMX512 communication protocol is provided, which comprises an address input and output protection circuit 1, an anti-reverse connection voltage reduction filter DC circuit 2, a differential signal conversion circuit 3 electrically connected with the anti-reverse connection voltage reduction filter DC circuit 2, and a plurality of voltage reduction constant current dimming driving circuits 4 electrically connected with the anti-reverse connection voltage reduction filter DC circuit 2. The address input and output protection circuit 1 is electrically connected with a decoding control module 5. The signal reading end of the decoding control module 5 is electrically connected with the signal output end of the differential signal conversion circuit 3. The decoding control module 5 is provided with a plurality of PWM output ends, and the plurality of PWM output ends are correspondingly electrically connected with the voltage reduction constant current dimming driving circuits 4. The decoding control module 5 can send PWM electrical signals to the voltage reduction constant current dimming driving circuits 4 through the PWM output ends, so that the voltage reduction constant current dimming driving circuits 4 can drive the LED lamp beads 6 to turn on and off. The anti-reverse connection voltage reduction filter DC circuit 2 comprises an anti-reverse connection filter sub-circuit 21 and a voltage reduction filter sub-circuit 22 connected in sequence. The anti-reverse connection filter sub-circuit 21 can provide DC working high voltage for the plurality of voltage reduction constant current dimming driving circuits 4. The voltage reduction filter sub-circuit 22 can provide DC working low voltage for the address input and output protection circuit 1, the differential signal conversion circuit 3, and the plurality of voltage reduction constant current dimming driving circuits 4. The PWM output ends, the voltage reduction constant current dimming driving circuits 4, and the LED lamp beads 6 are all provided with at least seven, and the base colors of each LED lamp bead 6 are different.

[0073] In one aspect of the present embodiment, the multi-channel current conversion amplification unit and the current sampling control unit in the prior art are abandoned. Under the condition of ensuring that the human eye cannot perceive within ±3% color difference, the present application directly supplies constant current by using the voltage reduction constant current dimming driving circuit, so that the LED lamp bead color difference caused by slight current fluctuation can fall within the ±3% color difference range. This not only meets the demand for constant current output of multi-base color LED lamps, but also meets the actual engineering demand, reduces the number of electronic components required in the circuit, greatly reduces the manufacturing cost, and on the contrary, avoids the interference on the amplification factor and precision of the amplification unit caused by the introduction of the multi-channel current conversion amplification unit and the current sampling control unit affected by temperature, which is not conducive to the consistency of current output.

[0074] In another aspect, the address input and output protection circuit, the reverse connection prevention and voltage reduction filter DC circuit and the differential signal conversion circuit are provided, the address input and output protection circuit is electrically connected with the decoding control module, the signal reading end of the decoding control module is electrically connected with the signal output end of the differential signal conversion circuit, the reverse connection prevention and voltage reduction filter DC circuit comprises a reverse connection prevention filter sub-circuit and a voltage reduction filter sub-circuit connected in sequence, the reverse connection prevention filter sub-circuit can provide DC working high voltage for the several voltage reduction constant current light adjustment driving circuits, the voltage reduction filter sub-circuit can provide DC working low voltage for the address input and output protection circuit, the differential signal conversion circuit and the several voltage reduction constant current light adjustment driving circuits, and can provide stable constant DC low voltage +5V and DC high voltage +36V for the decoding control module, the voltage reduction constant current light adjustment driving circuit, the differential signal conversion circuit and the LED lamp bead, so as to realize the hierarchical output of DC voltage, without the need of separately designing circuits of different voltage grades to output power supply, reduce the investment of circuit components and design cost, improve the safety of the power supply circuit, and the power supply circuit is not easy to be damaged. In addition, the anti-surge technology processing of the address input and output of the decoding control module and the signal denoising technology processing during the differential signal input play a positive role in the multi-channel constant current stable driving.

[0075] In addition, the decoding control module is provided with a plurality of PWM output ends, the plurality of PWM output ends are correspondingly electrically connected with the voltage reduction constant current light adjustment driving circuit, the decoding control module can send PWM electrical signals to the voltage reduction constant current light adjustment driving circuit through the PWM output end, so that the voltage reduction constant current light adjustment driving circuit can drive the LED lamp bead to turn on and off. Here, the PWM output end, the voltage reduction constant current light adjustment driving circuit and the LED lamp bead are all provided with at least seven, and the base color of each LED lamp bead is different, that is, the LED lamp of the application has seven LED lamp beads with different base colors, and the seven LED lamp beads with different base colors have different color temperatures and colors, so that the corresponding lamp has multiple change states, the color or color temperature display is more diverse, the mixed color effect or adjustable mixed color space is larger under the driving of the voltage reduction constant current light adjustment driving circuit, the adjustability of the mixed color light source is greatly exerted, the mixed color is more diverse, a wider color gamut area is realized, the color gamut coverage is larger, the color temperature range of the mixed white light is wider, the quality is better, and the spectrum of the mixed white light can realize full-spectrum white light, so as to meet the demand of city light beautification lighting.

[0076] The decoding control module 5 adopts a DMX512 decoding chip, specifically a high-performance customized DMX01 chip, which is an LED light driving control IC with DMX512 differential parallel protocol, can select 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8-way PWM signal output, has 65536-level gray scale, can be internally programmed, can be used for sample lamp level simple engineering demonstration, the gray scale smoothing function makes the color change more smooth, the fixed 8K port refresh frequency can be adjusted by software 16-level variable duty cycle for each channel PWM signal, and in the embodiment, at least the differential signal decoding function, PWM adjustable duty cycle pulse output function, constant power expansion protocol function and demonstration program playing display function can be achieved.

[0077] As shown in FIGS. 2-4, in the above embodiment, the reverse connection prevention filter sub-circuit 21 preferably comprises a first lightning protection diode TS1 connected in parallel to the power input end, a patch type first reverse connection prevention P-channel MOS tube Q1 and a second reverse connection prevention P-channel MOS tube Q2 electrically connected with the first lightning protection diode TS1, a first resistor R2, a second resistor R1, a first capacitor EC1, a second capacitor EC2 and a third capacitor C6 connected in parallel and grounded, the first reverse connection prevention P-channel MOS tube Q1 and the second reverse connection prevention P-channel MOS tube Q2 share a drain and a gate, the first resistor R2 is electrically connected between the source and the gate of the first reverse connection prevention P-channel MOS tube Q1 and the second reverse connection prevention P-channel MOS tube Q2, one end of the second resistor R1 is electrically connected with the first resistor R2, the other end of the second resistor R1 is grounded, the resistance value of the first resistor R2 is 10k, the resistance value of the second resistor R1 is 20k, the capacitance value of the first capacitor EC1 is 100uF, the capacitance value of the third capacitor C6 is 225pF, and the model of the first lightning protection diode TS1 is SMDJ40CA.

[0078] The voltage reduction filter sub-circuit 22 comprises a voltage reduction chip 221, a fourth capacitor C5 and a fifth capacitor C7 electrically connected with a 1-pin of the voltage reduction chip 221, the fourth capacitor C5 and the fifth capacitor C7 are connected in parallel with the ground; the voltage reduction filter sub-circuit 22 further comprises a first energy storage inductor L8 and a first diode D8 electrically connected with a 2-pin of the voltage reduction chip 221, a first voltage feedback resistor R6, a second voltage feedback resistor R7 and a sixth capacitor C4 electrically connected with a 3-pin of the voltage reduction chip 221, the sixth capacitor C4 is connected in parallel with the first voltage feedback resistor R6, the first energy storage inductor L8 is further connected with a seventh capacitor C2, an eighth capacitor C3, the first voltage feedback resistor R6 and the sixth capacitor C4, the seventh capacitor C2 and the eighth capacitor C3 are connected in parallel and connected with the ground, the second voltage feedback resistor R7 is connected with the ground, the 5-pin, the 6-pin, the 7-pin and the 8-pin of the voltage reduction chip 221 are connected with the ground in common, wherein the capacitance value of the fifth capacitor C7 is 225pF, the model of the voltage reduction chip 221 is XL7005A, the model of the first diode D8 is a SK36B patch Schottky diode, the model of the first energy storage inductor L8 is L8GBF7032 and the inductance value is 100uH, the capacitance value of the eighth capacitor C3 and the fourth capacitor C5 is 104pF, the capacitance value of the seventh capacitor C2 is 225pF, the resistance value of the first voltage feedback resistor R6 is 15.8k, the resistance value of the second voltage feedback resistor R7 is 4.7k, and the capacitance value of the sixth capacitor C4 is 330pF.

[0079] The embodiment takes the input voltage DC 36V as an example. The DC-DC step-down constant current dimming drive module uses the constant current drive chip NL30560 and works in the continuous conduction mode. It is suitable for the power supply voltage between DC 5V-DC 60V. The output current of the setting circuit is adjusted through the external current sampling resistor. The maximum output current supports 5A. DC 36V is connected to the 36V+ port and the GND port of the decoding board to supply power for the lamp decoding board. The first lightning protection diode TS1 absorbs the starting or closing or lightning induced voltage of the power supply to protect the normal work of the lamp decoding board. After the anti-reverse connection function circuit composed of the first resistance R2, the second resistance R1, the first capacitor EC1, the second capacitor EC2 and the third capacitor C6, a relatively stable DC 36V voltage is obtained after filtering. The circuit ensures stable DC power supply voltage and current. Then, the current limiting and voltage stabilizing circuit composed of the first voltage feedback resistor R6, the second voltage feedback resistor R7, the first diode D8, the sixth capacitor C4, the seventh capacitor C2 and the eighth capacitor C3 limits the current and stabilizes the voltage of the DC 36V. After the output voltage of the DC-DC step-down constant current dimming drive module is stabilized at DC 5V, the sixth capacitor C4, the seventh capacitor C2 and the eighth capacitor C3 are filtered to output a stable DC 5V working voltage to the decoding control module, the step-down constant current dimming drive circuit and the differential signal conversion circuit.

[0080] Detailed working principle of anti-reverse connection filter sub-circuit 21 and step-down filter sub-circuit 22:

[0081] Working principle of anti-reverse connection filter sub-circuit 21:

[0082] 1) Lightning protection: when the power input end is subjected to voltage impact during starting or closing, or lightning induced voltage, the first lightning protection diode TS1 (model SMDJ40CA) will be turned on to absorb these instantaneous overvoltages, thereby protecting the subsequent circuit from damage.

[0083] 2) Anti-reverse connection function: when the positive and negative poles of the power supply are connected in reverse, the first anti-reverse connection P-channel MOS tube Q1 and the second anti-reverse connection P-channel MOS tube Q2 will be in the cut-off state, thereby preventing current from passing through and protecting the circuit from damage. When connected normally, the two MOS tubes will be turned on to allow current to pass through.

[0084] 3) Filter: The voltage divider circuit composed of the first resistor R2 (10kΩ) and the second resistor R1 (20kΩ) is used to provide a bias voltage for the gate of the MOS tube, ensuring the normal operation of the MOS tube. The first capacitor EC1 (100uF), the second capacitor EC2, and the third capacitor C6 (225pF) are connected in parallel to the ground, playing a filtering role and filtering out high-frequency noise in the power supply to provide a stable DC operating voltage for the circuit.

[0085] Working principle of the voltage reduction filter sub-circuit 22:

[0086] 1) Voltage reduction: The voltage reduction chip 221 (model XL7005A) adjusts the output voltage according to the voltage division ratio of the first voltage feedback resistor R6 (15.8kΩ) and the second voltage feedback resistor R7 (4.7kΩ), so that it is stabilized at about DC 5V.

[0087] 2) Current limiting and voltage stabilization: The first energy storage inductor L8 (model L8GBF7032, inductance 100uH) and the first diode D8 (patch Schottky diode of model SK36B) constitute the charging and discharging circuit of the inductor, which is used to stabilize the output voltage and limit the output current. The sixth capacitor C4 (330pF), the seventh capacitor C2 (225pF), and the eighth capacitor C3 (104pF, same as the fourth capacitor C5) are connected in parallel to the ground, playing a filtering role and further smoothing the output voltage.

[0088] 3) Power supply: The voltage reduction chip 221 stabilizes the input voltage of DC 36V to DC 5V and provides a stable DC 5V operating voltage to the decoding control module, the voltage reduction constant current dimming drive circuit, and the differential signal conversion circuit through the filter circuit, ensuring the normal operation of these circuits.

[0089] The working principle of the entire circuit is to convert the unstable DC 36V input voltage into a stable and reliable DC 5V operating voltage through lightning protection, reverse connection prevention, filtering, and voltage reduction and stabilization, etc., to supply the subsequent circuits, ensuring the normal operation of the lamp decoding board.

[0090] As shown in FIG. 5, the above embodiment preferably, the address input and output protection circuit 1 includes a first self-resetting fuse F1 connected in series with the PI address input end of the decoding control module 5 and a second self-resetting fuse F2 connected in series with the PO address output end of the decoding control module 5, and the address input and output protection circuit 1 further includes a first surge protection diode TS2, a third resistor R3, a second surge protection diode TS3, and a fourth resistor R4, the third resistor R3 is electrically connected with the PI address input end, the third resistor R3 is further electrically connected with the first self-resetting fuse F1 and the first surge protection diode TS2, the first surge protection diode TS2 is grounded, the fourth resistor R4 is electrically connected with the PO address output end, the fourth resistor R4 is further electrically connected with the second self-resetting fuse F2 and the second surge protection diode TS3, and the second surge protection diode TS3 is grounded, wherein the model numbers of the first surge protection diode TS2 and the second surge protection diode TS3 are both P0080SB-LV1, the model numbers of the first self-resetting fuse F1 and the second self-resetting fuse F2 are MF-NSMF012-2, and the resistance values of the third resistor R3 and the fourth resistor R4 are both 510 ohms;

[0091] The PI port and the PO port of the decoding control module in the embodiment are input and output ports for address programming, and the first self-resetting fuse F1 and the second self-resetting fuse F2 are connected to the PI and PO pins of the decoding control module through the third resistor R3 and the fourth resistor R4, respectively. The first surge protection diode TS2 and the second surge protection diode TS3 (i.e. pressure-sensitive protection devices) are added between the first self-resetting fuse F1 and the third resistor R3 and between the second self-resetting fuse F2 and the fourth resistor R4, so as to prevent irreversible damage to the decoding control module caused by high-voltage surges on the address line. The decoding control module can also support online power-on encoding, which lays a foundation for functional upgrade and product iteration.

[0092] The address input and output protection circuit 1 is designed to protect the address input (PI port) and output (PO port) of the decoding control module 5.

[0093] 1) The first self-resetting fuse F1 and the second self-resetting fuse F2:

[0094] F1 is connected in series with the PI address input end, and F2 is connected in series with the PO address output end. These fuses can automatically cut off the circuit when encountering overcurrent and re-close after the voltage returns to normal, thereby protecting the circuit and avoiding damage to related equipment caused by excessive current.

[0095] 2) The first surge protection diode TS2 and the second surge protection diode TS3:

[0096] These diodes are connected in series between the fuses F1 and F2 to prevent high voltage surges on the address lines from damaging the decode control module 5. When an overvoltage occurs on the address lines, these diodes will pass the voltage to ground, thereby protecting the circuit from damage.

[0097] 3) Third resistor R3 and fourth resistor R4:

[0098] R3 and R4 are connected to the PI and PO address lines, respectively, to limit current flow and are also connected to the fuses and surge diodes.

[0099] 4) Decode control module 5:

[0100] The PI and PO ports are the input and output ports for address programming. They are connected to the decode control module 5 through fuses and resistors, ensuring the stability and safety of the address input and output ports.

[0101] The decode control module 5 supports online power-on encoding, which means that address programming can be performed while the device is powered on, providing convenience for functional upgrades and product iterations.

[0102] In summary, this address input and output protection circuit effectively protects the address input and output ports of the decode control module through the combination of fuses, surge diodes, and resistors, ensuring the stable operation and safety of the device. At the same time, it supports online power-on encoding, improving the flexibility and scalability of the device.

[0103] As shown in FIG. 6, the differential signal conversion circuit 3 preferably includes a signal transceiver module 31, a first signal suppression resistor RA and a second signal suppression resistor RB connected in series with the A pin and the B pin of the signal transceiver module 31, the DE pin, the pin and the GND pin of the signal transceiver module 31 are electrically connected and grounded, the VCC pin of the signal transceiver module 31 is electrically connected with a ninth capacitor C1, the ninth capacitor C1 is grounded, the RO pin of the signal transceiver module 31 is electrically connected with the RXD pin of the decode control module 5, wherein the capacitance value of the ninth capacitor C1 is 105 pF, the resistance values of the first signal suppression resistor RA and the second signal suppression resistor RB are both 5.1 k, and the transceiver module 31 is of the MAX13085EESA type;

[0104] The DMX512 differential signal of the embodiment is input to the A pin and the B pin of the signal transceiver module through the first signal suppression resistor RA and the second signal suppression resistor RB after reducing the scattered noise signal, and then is converted into a TTL signal by the internal circuit of the signal transceiver module and output to the RXD port of the decoding control module at the RO port.

[0105] In addition, the signal input end of the decoding board uses the RS-485 special serial communication IC MAX13085E to receive the DMX512 control signal, and converts the A / B differential signal output by the DMX512 controller into a TTL signal which is convenient for the DMX512 decoding chip to identify.

[0106] The working principle of the differential signal conversion circuit 3 is as follows:

[0107] 1) Signal input and suppression:

[0108] The DMX512 differential signal is input through the A and B interfaces.

[0109] Before entering the signal transceiver module 31, the differential signal first passes through the first signal suppression resistor RA and the second signal suppression resistor RB (both with a resistance of 5.1kΩ). The main function of the two resistors is to reduce scattered noise signals and ensure signal quality.

[0110] 2) Signal transceiver module 31:

[0111] The signal transceiver module 31 is of the type MAX13085EESA, which is an RS-485 / RS-422 transceiver.

[0112] The DE pin, the RE pin and the GND pin of the MAX13085EESA are electrically connected and grounded, which is used to configure and control the operating mode of the transceiver.

[0113] The VCC pin provides power for the module and is grounded through the ninth capacitor C1 (with a capacitance of 105pF) for power filtering.

[0114] The A pin and the B pin are used to receive differential signals, and the converted signals are output from the RO port after internal processing.

[0115] 3) Signal conversion:

[0116] In the signal transceiver module 31, the input DMX512 differential signal (A / B signal) is converted into a TTL signal.

[0117] The TTL signal is output at the RO port and connected to the RXD pin of the decoding control module 5.

[0118] 4) Decoding and control:

[0119] The RXD port of the decoding control module 5 reads the input TTL signal.

[0120] After internal analysis, the decoding control module converts the signal into a control signal for controlling the duty cycle of each PWM port.

[0121] The main function of the differential signal conversion circuit 3 is to convert the A / B differential signal output by the DMX512 controller into a TTL signal for use by the decoding control module.

[0122] MAX13085EESA, as the core of the signal transceiver module, plays a key role in the signal conversion process, ensuring the accuracy and reliability of the signal.

[0123] The application of signal suppression resistors and filter capacitors and other components further improves the signal quality and stability of the system.

[0124] As shown in Figures 5 and 6, the VCC pin of the decoding control module 5 is electrically connected to the GND pin, and the GND pin of the decoding control module 5 is electrically connected to the tenth capacitor C8 and grounded, wherein the capacitance of the tenth capacitor C8 is 105pF.

[0125] By electrically connecting the tenth capacitor C8 between the VCC pin and the GND pin of the decoding control module, the output current and voltage can be denoised, filtered, and stabilized.

[0126] As shown in Figure 7, the above embodiment is preferably taken as an example of the LED lamp bead 6 with the R base color, and the Buck constant current dimming drive circuit 4 of the other six base colors G, B, W, C, L and A is the same as the Buck constant current dimming drive circuit 4. The Buck constant current dimming drive circuit 4 comprises a DC-DC Buck constant current dimming drive module 41. The 1st pin, the 2nd pin, the 3rd pin and the 4th pin of the DC-DC Buck constant current dimming drive module 41 are respectively electrically connected with the current-limiting resistor RV7, the signal anti-interference resistor RP7, the 11th capacitor CV7 and the chip sampling resistor RS7. The 5th pin and the 6th pin of the DC-DC Buck constant current dimming drive module 41 are electrically connected. The 7th pin and the 8th pin of the DC-DC Buck constant current dimming drive module 41 are electrically connected and grounded. The 1st pin and the 3rd pin of the DC-DC Buck constant current dimming drive module 41 are electrically connected. The signal anti-interference resistor RP7 is further electrically connected with a voltage pull-down resistor RG7. The chip sampling resistor RS7, the 11th capacitor CV7 and the voltage pull-down resistor RG7 are grounded. The 5th pin and the 6th pin of the DC-DC Buck constant current dimming drive module 41 are further electrically connected with the second energy storage inductor L7. The signal anti-interference resistor RP7 and the voltage pull-down resistor RG7 are electrically connected with the PWM output end of the decoding control module 5. The second energy storage inductor L7 is electrically connected with the LED lamp bead 6. The capacitance of the 11th capacitor CV7 is 105 pF. The resistance of the voltage pull-down resistor RG7 is 4.7 k. The resistance of the signal anti-interference resistor RP7 is 1 k. The resistance of the current-limiting resistor RV7 is 22 ohms. The model of the DC-DC Buck constant current dimming drive module 41 is NL30560 / SOP8. The resistance of the chip sampling resistor RS7 is 36 ohms. The inductance of the second energy storage inductor L7 is 100 μH.

[0127] The Buck constant current dimming drive circuit of the embodiment adopts the Buck topology structure design, has a simple peripheral circuit and high efficiency. The 1st pin of the DC-DC Buck constant current dimming drive module is supplied with power by the DC 5V voltage through the current-limiting resistor RV7, and the 3rd pin is set as high level. The 2nd pin is used as the input pin of the control PWM signal. The signal is subjected to anti-interference treatment through the signal anti-interference resistor RP7. The voltage pull-down resistor RG7 is used for the ground. The port voltage of the input pin of the PWM signal is pulled down, so that the DC-DC Buck constant current dimming drive module does not work when there is no PWM signal. The chip sampling resistor RS7 between the 4th pin and the ground determines the maximum output capacity of the DC-DC Buck constant current dimming drive module.

[0128] The 5th pin and the 6th pin are the gate of the built-in MOS tube of the DC-DC Buck constant current dimming drive module. The second energy storage inductor L7 is the energy storage inductor of the Buck constant current dimming drive circuit. The inductance directly affects the working frequency of the DC-DC Buck constant current dimming drive module and the conversion efficiency of the Buck constant current dimming drive circuit.

[0129] DC-DC step-down constant current dimming drive module 41:

[0130] The module adopts Buck topology structure design, which can reduce the input filtered DC bus voltage to the normal working voltage of LED load and keep the constant output current. The module of NL30560 / SOP8 type is used as an example.

[0131] Pin 1 receives power supply from DC 5V voltage through current limiting resistor RV7.

[0132] Pin 3 is set to high level to make the module work.

[0133] Pin 2 is used as the input pin of PWM signal to control the brightness of LED.

[0134] Peripheral circuit:

[0135] Signal anti-interference resistor RP7 is used for anti-interference processing of PWM signal.

[0136] Voltage pull-down resistor RG7 is used to pull down the port voltage of the input pin of PWM signal to ensure that the DC-DC step-down constant current dimming drive module does not work when PWM has no signal.

[0137] The capacitance of the eleventh capacitor CV7 is 105pF, which is used for circuit stabilization.

[0138] The size of chip sampling resistor RS7 determines the maximum output capacity of DC-DC step-down constant current dimming drive module.

[0139] LED drive part:

[0140] Pin 5 and pin 6 are the gate of the built-in MOS tube of DC-DC step-down constant current dimming drive module.

[0141] The second energy storage inductor L7 is the energy storage inductor of the step-down constant current dimming drive circuit, whose inductance value is 100μH, which is used for storing energy, and its size directly affects the working frequency and conversion efficiency of DC-DC step-down constant current dimming drive module.

[0142] In summary, this step-down constant current dimming drive circuit reduces the input voltage to the required voltage through DC-DC step-down module, keeps the output current constant, controls the brightness of LED lamp bead through PWM signal, and processes and stabilizes the PWM signal through peripheral circuit.

[0143] As shown in Fig. 7, in the above embodiment, further preferably, the step-down constant-current dimming driving circuit 4 further comprises a freewheeling diode D7, the positive electrode of the freewheeling diode D7 is electrically connected to the second energy storage inductor L7, the negative electrode of the freewheeling diode D7 is electrically connected to the direct-current working high-voltage output end of the anti-reverse connection filtering sub-circuit 21, and the freewheeling diode D7 is of the SK56C / DO-214AB type.

[0144] In the embodiment, the main function of the freewheeling diode D7 is to provide a current loop for the continuous power supply for the load in the case that the MOS tube gate connected to the 5th pin and the 6th pin is disconnected, so as to ensure that there is stable current in the step-down constant-current dimming driving circuit to maintain the normal work of the LED lamp beads. Preferably, a Schottky diode is used as the freewheeling diode, which has the advantages of high switching frequency and low forward voltage drop. Therefore, in order to increase the conversion efficiency of the step-down constant-current dimming driving circuit, reduce the loss and cost, the Schottky diode is the most optimal choice as the freewheeling diode.

[0145] As shown in Fig. 8, in the above embodiment, preferably, the decoding control module 5 adopts a DMX01 chip, the decoding control module 5 is provided with seven-channel PWM output ends, the step-down constant-current dimming driving circuit 4 is provided with seven seven-channel PWM output ends which are electrically connected to the step-down constant-current dimming driving circuit 4 one by one, and the seven step-down constant-current dimming driving circuits 4 are respectively electrically connected to the R primary color LED lamp beads, the G primary color LED lamp beads, the B primary color LED lamp beads, the W primary color LED lamp beads, the C primary color LED lamp beads, the L primary color LED lamp beads and the A primary color LED lamp beads.

[0146] In the embodiment, the decoding control module controls the seven-channel PWM driving signal output, and each channel of the PWM driving signal is output to a plurality of groups of LED lamp beads of the same primary color. Therefore, the seven channels of the PWM driving signal output can control a total of seven groups of LED lamp beads of different primary colors, so that the RGBWCLA seven-primary-color mixing effect can be realized.

[0147] Embodiment 2

[0148] As shown in Figs. 9 to 11, in another embodiment of the present application, the lamp includes the multi-channel decoding driving circuit in the embodiment 1, and further includes a lamp panel 7, a plurality of heat dissipation pads 8 are arranged on the lamp panel 7, each heat dissipation pad 8 is welded with a seven-primary-color LED array 9 on one side, and the seven-primary-color LED array 9 includes R primary color LED lamp beads, G primary color LED lamp beads, B primary color LED lamp beads, W primary color LED lamp beads, C primary color LED lamp beads, L primary color LED lamp beads and A primary color LED lamp beads.

[0149] The embodiment can protect the LED lamp beads and avoid high-temperature damage, because the seven-primary-color LED array is surrounded by seven lamp beads with different primary colors in an array form, heat is generated during light source emission, and the metal heat dissipation pad is used for real-time heat dissipation.

[0150] The LED light source lamp bead used in the application is model 6070RGBLACW25FC120-NUVCNG-02A, and the seven colors are R (red), G (green), B (blue), W (white 4000K), C (cyan), L (lemon), and A (amber). The single size and die disassembly arrangement are shown in FIGS. 9 and 10.

[0151] As shown in FIGS. 8 to 10, in the above embodiment, preferably, the LED lamp beads with the same primary color of each seven-primary-color LED array 9 are connected in series.

[0152] In the embodiment, the LED lamp beads with the same primary color of each seven-primary-color LED array are connected in series, so that the LED lamp beads with the same primary color can form a single-color LED lamp string, and the lamp can form seven LED lamp strings with different primary colors. The seven LED lamp strings with different primary colors can execute the intermittent overall on-off work of the LED lamp strings at the same time or at different times according to the instructions of the PWM driving signal output.

[0153] Embodiment 3

[0154] As shown in FIG. 12, in another embodiment of the application, a multi-channel decoding driving circuit in the embodiment 1 is included, the package includes a semi-closed shell 100, a circuit board 200 with a multi-channel decoding driving circuit, and a heat sink 300. The circuit board 200 is arranged in the shell 100, and the circuit board 200 is provided with the heat sink 300 on the side of the electronic components. The circuit board 200, the heat sink 300, and the shell 100 are all filled with a heat-conducting insulating adhesive (not shown in the figure), and an insulating gasket (not shown in the figure) is arranged between the circuit board 200 and the shell 100.

[0155] The multi-channel decoding drive circuit has high conversion efficiency. Long-time operation of the multi-channel decoding drive circuit and electronic components on the circuit board generates a large amount of heat. At this time, the heat is conducted to the heat sink for high-efficiency heat dissipation through the design of the heat sink, which can effectively improve the heat dissipation effect. In addition, the electronic components have the effects of waterproofing, heat insulation, and dust prevention by filling the heat-conducting insulating adhesive between the circuit board, the heat sink, and the shell. The electronic components and the circuit board are fixed in position, and the heat dissipation capacity is enhanced. The insulating gasket between the circuit board and the shell can achieve electrical insulation between the electronic components and the shell, further improve the service life of the electronic components, and improve the heat conduction and heat dissipation effect.

[0156] Figure 13: Internal view without a heat sink and with a heat-conducting insulating adhesive.

[0157] In this configuration, the circuit board is connected to the shell directly through the heat-conducting insulating adhesive.

[0158] The heat-conducting insulating adhesive is used to ensure heat conduction between the circuit board and the shell while maintaining electrical insulation.

[0159] As can be seen from the heat simulation distribution map, although the heat-conducting insulating adhesive provides a certain heat conduction effect, the heat on the circuit board is still relatively concentrated, especially near high-power components.

[0160] Figure 14: External view without a heat sink and with a heat-conducting insulating adhesive.

[0161] From the external view, the heat distribution on the surface of the shell can be seen. Since there is no heat sink, the temperature distribution on the surface of the shell corresponds to the heat distribution on the internal circuit board, and the heat is relatively concentrated. In some areas, the surface of the shell may feel warm or even hot.

[0162] Figure 15: Internal view with a heat sink and a heat-conducting insulating adhesive.

[0163] In this configuration, in addition to the heat-conducting insulating adhesive, a heat sink (such as a heat sink fin, a heat pipe, etc.) is added. The heat sink is connected to the circuit board through the heat-conducting insulating adhesive, effectively expanding the heat dissipation area. As can be seen from the heat simulation distribution map, the addition of the heat sink makes the heat distribution on the circuit board more uniform, and the high-temperature area is significantly reduced.

[0164] Figure 16: External view with a heat sink and a heat-conducting insulating adhesive.

[0165] From the external view, the heat distribution on the surface of the shell with the heat sink can be seen. Due to the effect of the heat sink, the temperature distribution of the shell surface is more uniform, and the overall temperature is lower. Even in a high temperature environment (such as ambient temperature 50°), due to the effective heat dissipation effect of the heat sink, the overall temperature is about 20° lower than the traditional configuration, greatly improving the stability and reliability of the system. The embodiment of the application improves the heat dissipation performance of the system by increasing the heat-conducting insulating colloid and the heat sink. The heat-conducting insulating colloid ensures effective heat conduction between the circuit board and the heat sink while maintaining electrical insulation. The heat sink expands the heat dissipation area, quickly dissipates heat to the surrounding environment, thereby reducing the overall temperature of the system. Under the condition of ambient temperature 50°, the overall temperature of the system using this configuration is about 20° lower than the traditional configuration, showing excellent conduction and heat dissipation effect.

[0166] The above description is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or direct or indirect application in other related technical fields based on the content of the specification and drawings is also included in the patent protection scope of the application.

Claims

1. A multi-channel decoding driving circuit based on DMX512 communication protocol, characterized in that, The application relates to an address input and output protection circuit (1) for protecting address input PI ports and output PO ports of a decoding control module (5); an anti-reverse connection and voltage reduction filter direct current circuit (2) comprising an anti-reverse connection filter subcircuit (21) and a voltage reduction filter subcircuit (22), wherein the anti-reverse connection filter subcircuit (21) provides a direct current working high voltage, and the voltage reduction filter subcircuit (22) provides a direct current working low voltage; the high voltage is DC 36V, and the low voltage is DC 5V; a differential signal conversion circuit (3) electrically connected with the anti-reverse connection and voltage reduction filter direct current circuit (2) and used for converting a differential signal into a signal suitable for the decoding control module (5); a voltage reduction constant current light modulation driving circuit (4) electrically connected with the anti-reverse connection and voltage reduction filter direct current circuit and receiving a PWM electric signal from the decoding control module to drive LED lamp beads to be bright or dark; and the decoding control module (5) is electrically connected with the address input and output protection circuit (1) and the differential signal conversion circuit (3) and has a plurality of PWM output ends for controlling the voltage reduction constant current light modulation driving circuit (4). The PWM output end, the voltage reduction constant current light modulation driving circuit (4) and the LED lamp beads (6) are provided with at least seven, the base colors of each LED lamp bead (6) are different, the decoding control module (5) adopts a DMX01 chip, is provided with seven-channel PWM output ends, is electrically connected with seven voltage reduction constant current light modulation driving circuits (4) respectively, and the seven voltage reduction constant current light modulation driving circuits (4) are electrically connected with R base color LED lamp beads, G base color LED lamp beads, B base color LED lamp beads, W base color LED lamp beads, C base color LED lamp beads, L base color LED lamp beads and A base color LED lamp beads respectively. The anti-reverse connection filter subcircuit (21) comprises a first lightning protection diode connected in parallel with a power input end, a first anti-reverse connection P-channel MOS tube and a second anti-reverse connection P-channel MOS tube electrically connected with the first lightning protection diode, a first resistor, a second resistor, a first capacitor, a second capacitor and a third capacitor connected in parallel and grounded, the first anti-reverse connection P-channel MOS tube and the second anti-reverse connection P-channel MOS tube share a drain electrode and a gate electrode, the first resistor is electrically connected between the source electrode and the gate electrode of the first anti-reverse connection P-channel MOS tube and the second anti-reverse connection P-channel MOS tube, one end of the second resistor is electrically connected with the first resistor, and the other end of the second resistor is grounded. ​ ​ ​ 2. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: ​ 3. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: ​ The voltage reduction filter sub-circuit (22) comprises a voltage reduction chip (221), a fourth capacitor and a fifth capacitor electrically connected with a 1-pin of the voltage reduction chip (221), and the fourth capacitor and the fifth capacitor are connected in parallel with the ground; the voltage reduction filter sub-circuit (22) further comprises a first energy storage inductor and a first diode electrically connected with a 2-pin of the voltage reduction chip (221), a first voltage feedback resistor electrically connected with a 3-pin of the voltage reduction chip (221), a second voltage feedback resistor and a sixth capacitor, the sixth capacitor is connected in parallel with the first voltage feedback resistor, the first energy storage inductor is further electrically connected with a seventh capacitor, an eighth capacitor, a first voltage feedback resistor and a sixth capacitor, the seventh capacitor and the eighth capacitor are connected in parallel and connected with the ground, the second voltage feedback resistor is connected with the ground, and the 5-pin, the 6-pin, the 7-pin and the 8-pin of the voltage reduction chip (221) are commonly connected with the ground.

4. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: The address input and output protection circuit (1) comprises a first self-recovery fuse connected in series with a PI address input end of the decoding control module (5) and a second self-recovery fuse connected in series with a PO address output end of the decoding control module (5), and further comprises a first surge protection diode, a third resistor, a second surge protection diode and a fourth resistor, the third resistor is electrically connected with the PI address input end, the third resistor is further electrically connected with the first self-recovery fuse and the first surge protection diode, the first surge protection diode is connected with the ground, the fourth resistor is electrically connected with the PO address output end, the fourth resistor is further electrically connected with the second self-recovery fuse and the second surge protection diode, and the second surge protection diode is connected with the ground.

5. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: The differential signal conversion circuit (3) comprises a signal transceiver module (31), first and second signal suppression resistors connected in series with A and B pins of the signal transceiver module (31), a DE pin, a GND pin of the signal transceiver module (31) is electrically connected and grounded, a VCC pin of the signal transceiver module (31) is electrically connected with a ninth capacitor, the ninth capacitor is grounded, and a RO pin of the signal transceiver module (31) is electrically connected with an RXD pin of the decoding control module (5).

6. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: The tenth capacitor is electrically connected between the VCC pin and the GND pin of the decoding control module (5), and the GND pin of the decoding control module (5) is electrically connected with the tenth capacitor and connected with the ground.

7. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: The voltage reduction constant current dimming drive circuit (4) comprises a DC-DC voltage reduction constant current dimming drive module (41), the 1-pin, the 2-pin, the 3-pin and the 4-pin of the DC-DC voltage reduction constant current dimming drive module (41) are respectively electrically connected with a current limiting resistor, a signal anti-interference resistor, an eleventh capacitor and a chip sampling resistor, the 5-pin and the 6-pin of the DC-DC voltage reduction constant current dimming drive module (41) are electrically connected, the 7-pin and the 8-pin of the DC-DC voltage reduction constant current dimming drive module (41) are electrically connected and connected with the ground, the 1-pin and the 3-pin of the DC-DC voltage reduction constant current dimming drive module (41) are electrically connected, the signal anti-interference resistor is further electrically connected with a voltage pull-down resistor, the chip sampling resistor, the eleventh capacitor and the voltage pull-down resistor are all connected with the ground, the 5-pin and the 6-pin of the DC-DC voltage reduction constant current dimming drive module (41) are further electrically connected with a second energy storage inductor, the signal anti-interference resistor and the voltage pull-down resistor are both electrically connected with a PWM output end of the decoding control module (5), and the second energy storage inductor is electrically connected with the LED lamp bead (6).

8. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 7, characterized in that: The step-down constant current light modulation driving circuit (4) further comprises a freewheeling diode, the positive electrode of the freewheeling diode is electrically connected with the second energy storage inductor, and the negative electrode of the freewheeling diode is electrically connected with the direct current working high-voltage output end of the anti-reverse connection filtering sub-circuit (21).

9. The multi-channel decoding driving circuit based on DMX512 communication protocol according to claim 1, characterized in that: The decoding control module (5) adopts a DMX01 chip, is provided with seven channels of PWM output ends, and the step-down constant current light modulation driving circuit (4) is provided with seven corresponding PWM output ends.

10. A luminaire characterized by: The lamp includes a lamp panel (7) provided with a plurality of heat dissipation pads (8), one side of each heat dissipation pad (8) is welded with a seven-primary-color LED array (9), and the seven-primary-color LED array (9) includes R, G, B, W, C, L and A primary color LED lamp beads.

11. A luminaire as claimed in claim 10, characterised in that: The same primary color LED lamp beads of each seven-primary-color LED array (9) are connected in series.

12. A package, characterized by: The package includes a semi-closed shell (100), a circuit board (200) provided with the multi-channel decoding driving circuit and a heat sink (300), the circuit board (200) is arranged in the shell (100), the circuit board (200) is provided with the heat sink (300) on one side of electronic components, the circuit board (200), the heat sink (300) and the shell (100) are filled with heat-conducting insulating glue, and the circuit board (200) and the shell (100) are provided with insulating gaskets.

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