LED isolated control circuit and control device

Abstract

The utility model discloses a kind of LED isolation control circuit and control device, including power management unit, power management unit includes first power conversion module and second power conversion module, first power conversion module includes first positive connection end, first negative connection end, second power conversion module includes second positive connection end, second negative connection end, one end of LED module is electrically connected first positive connection end, isolation control module includes first conducting end, second conducting end, first input end and second input end, first conducting end is electrically connected the other end of LED module, second conducting end is electrically connected first negative connection end, first input end is electrically connected first positive connection end, second input end is electrically connected second positive connection end, isolation control module is used for conducting or disconnecting the electrical connection between LED module and first negative connection end, main control module is configured as output trigger signal control isolation control module work.

Description

Technical Field

[0001] This utility model relates to the field of LED light source technology, and in particular to an LED isolation control circuit and control device. Background Technology

[0002] LED modules have been widely used in lighting, decoration and advertising. With the continuous advancement of LED technology, higher requirements have been put forward for LED control technology, such as more precise dimming and color adjustment functions, higher energy efficiency and system stability.

[0003] In related technologies, LED modules are typically driven by a single driver chip connected to multiple LEDs, which are designed to share a common ground. Specifically, the driver chip controls the anode of each LED to independently adjust its brightness or color, while the cathodes of all LEDs are connected to the same ground wire.

[0004] However, this setup of multiple LEDs sharing a common ground with the control circuit presents significant problems in practical applications. When multiple LED modules are connected in parallel, the total power of the modules increases significantly, leading to a substantial rise in current. This high current may cause fluctuations in the ground potential, affecting the control accuracy of the driver chip, thereby reducing the stability and reliability of the LED module, and may even cause electromagnetic compatibility issues, further exacerbating system interference. Utility Model Content

[0005] The main purpose of this invention is to propose an LED isolation control circuit, which aims to solve the problem of interference to the main control module caused by ground potential fluctuations generated by the LED module under high current operating conditions.

[0006] To achieve the above objectives, this utility model proposes an LED isolation control circuit, which includes: A power management unit, comprising a first power conversion module and a second power conversion module, wherein the first power conversion module includes a first positive connection terminal and a first negative connection terminal, and the second power conversion module includes a second positive connection terminal and a second negative connection terminal, and one end of the LED module is electrically connected to the first positive connection terminal. An isolation control module includes a first conducting terminal, a second conducting terminal, a first input terminal, and a second input terminal. The first conducting terminal is electrically connected to the other end of the LED module, the second conducting terminal is electrically connected to the first negative connection terminal, the first input terminal is electrically connected to the first positive connection terminal, and the second input terminal is electrically connected to the second positive connection terminal. The isolation control module is used to connect or disconnect the electrical connection between the LED module and the first negative connection terminal. The main control module is electrically connected to the second positive connection terminal, the second negative connection terminal and the isolation control module respectively. The main control module is configured to output a trigger signal to control the operation of the isolation control module.

[0007] In some embodiments, the first power conversion module generates a first voltage value for powering the main control module, and the second power conversion module generates a second voltage value for powering the isolation control module, wherein the first voltage value is less than the second voltage value.

[0008] In some embodiments, the isolation control module includes: An optocoupler, comprising a first pin, a second pin, a third pin, and a fourth pin, wherein the first pin is electrically connected to the second input terminal, the second pin is electrically connected to the main control module, and the third pin is electrically connected to the first input terminal; The switching transistor has its drain electrically connected to the first on terminal, its source electrically connected to the first negative terminal, and its gate electrically connected to the fourth pin.

[0009] In some embodiments, the number of isolation control modules is set to multiple, and the first conducting terminals of the multiple isolation control modules are respectively used to electrically connect to different LED modules.

[0010] In some embodiments, the isolation control module further includes a voltage divider module electrically connected between the fourth pin and the gate of the switching transistor.

[0011] In some embodiments, the voltage divider module includes a first resistor and a second resistor, the gate of the switching transistor is electrically connected to the fourth pin via the first resistor, and the gate of the switching transistor is also electrically connected to the first negative connection terminal via the second resistor.

[0012] In some embodiments, the main control module is an AW2026 chip.

[0013] In some embodiments, the LED module is at least one of a red LED, a green LED, and a yellow LED.

[0014] In some embodiments, the main control module includes multiple control pins, each of which is used to electrically connect to a different isolation control module.

[0015] This utility model further proposes a control device, including the LED isolation control circuit of the aforementioned embodiment.

[0016] The beneficial effects of this utility model are as follows: by setting up independent first power conversion module and second power conversion module, and using isolation control module to realize electrical isolation control between LED module and main control module, the driving circuit of LED module and control circuit of main control module do not share ground line, thereby effectively eliminating the interference of ground potential fluctuation generated by LED module under high current operation to main control module, and improving the stability and reliability of the entire control system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the module electrical connections of the LED isolation control circuit in one embodiment of the present invention; Figure 2 This is a circuit diagram of an LED isolation control circuit in one embodiment of the present invention; Figure 3 This is a circuit diagram of an LED isolation control circuit in another embodiment of the present invention.

[0018] Explanation of icon numbers: 10. LED module; 100. Power Management Unit; 110. First power conversion module; A1. First positive connection terminal; A2. First negative connection terminal; 120. Second power conversion module; B1. Second positive connection terminal; B2. Second negative connection terminal; 200. Isolation control module; 201. First conducting terminal; 202. Second conducting terminal; 203. First input terminal; 204. Second input terminal; U1, optocoupler; U11, first pin; U12, second pin; U13, third pin; U14, fourth pin; Q1. Switching transistor; 210. Voltage divider module; R1. First resistor; R2. Second resistor; 300. Main control module.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0023] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0024] Reference Figure 1 An embodiment of this utility model provides an LED isolation control circuit, which includes: The power management unit 100 includes a first power conversion module 110 and a second power conversion module 120. The first power conversion module 110 includes a first positive connection terminal A1 and a first negative connection terminal A2. The second power conversion module 120 includes a second positive connection terminal B1 and a second negative connection terminal B2. One end of the LED module is electrically connected to the first positive connection terminal A1. The isolation control module 200 includes a first conducting terminal 201, a second conducting terminal 202, a first input terminal 203, and a second input terminal 204. The first conducting terminal 201 is electrically connected to the other end of the LED module, the second conducting terminal 202 is electrically connected to the first negative connection terminal A2, the first input terminal 203 is electrically connected to the first positive connection terminal A1, and the second input terminal 204 is electrically connected to the second positive connection terminal B1. The isolation control module 200 is used to turn on or off the electrical connection between the LED module and the first negative connection terminal A2. The main control module 300 is electrically connected to the second positive connection terminal B1, the second negative connection terminal B2 and the isolation control module 200 respectively. The main control module 300 is configured to output a trigger signal to control the isolation control module 200 to work.

[0025] In this embodiment, the power management unit 100 includes a first power conversion module 110 and a second power conversion module 120, mainly used for power conversion, such as AC to DC conversion. This can be achieved using components such as an LM7805 voltage regulator chip, an MC34063 switching regulator chip, or a TL494 pulse width modulation control chip. It should be noted that in this embodiment, the first voltage value generated by the first power conversion module 110 and the second voltage value generated by the second power conversion module 120 can be such that the first voltage value is greater than the second voltage value. This is because the first power conversion module 110 supplies power to the LED module, which typically requires a higher voltage to drive the LED to emit light, while the second power module supplies power to the control circuit, and its voltage value can be lower, for example, the first voltage value is 12V or 24V, and the second voltage value is 5V or 3.3V, etc.

[0026] In this embodiment, the isolation control module 200 is mainly used to receive trigger signals. Specifically, after receiving a trigger signal, the isolation control module 200 turns on or off the electrical connection between the other end of the LED module and the first negative connection terminal A2. Specifically, the first input terminal 203 is electrically connected to the first positive connection terminal A1, and the isolation control module 200 obtains operating power from the first positive connection terminal A1. Since one end of the LED module is connected to the first positive connection terminal A1, and the other end is electrically connected to the first negative connection terminal A2 via the isolation control module 200, the current direction is: first positive connection terminal A1, LED module, first conducting terminal 201, second conducting terminal 202, first negative connection terminal A2. After receiving the trigger signal, the isolation control module 200 controls the connection or disconnection of the LED module's current loop by turning on or off the electrical connection between the first conducting terminal 201 and the second conducting terminal 202, thereby realizing the on or off state of the LED module.

[0027] It should be noted that the LED module in this embodiment can be one of the different colors of LED lights, such as red, yellow, and green, or it can be an LED light group or an LED display panel composed of multiple LED lights.

[0028] The isolation control module 200 in this embodiment can be implemented using optocoupler U1 isolation devices such as PC817, TLP521, 4N35, etc., or it can be built using optocoupler U1 and MOSFET transistors such as IRF540, IRFZ44N, etc., or it can be implemented using solid-state relays such as G3VM-401BY to achieve electrical isolation control.

[0029] In this embodiment, the main control module 300 outputs a trigger signal to control the operating state of the isolation control module 200. The main control module 300 can be a microcontroller such as STM32 or Arduino series, or a dedicated LED control chip such as AW2026. In some embodiments, the main control module 300 can output a trigger signal (which can be a high-level signal or a low-level signal) according to a preset program, and can also dynamically adjust the output state of the trigger signal based on received external control commands or sensor signals.

[0030] In this embodiment, the LED isolation control circuit operates as follows: First, the first power conversion module 110 converts the input power into a voltage value suitable for the operation of the LED module, and provides driving power to the LED module through the first positive connection terminal A1; at the same time, the second power conversion module 120 converts the input power into a voltage value suitable for the operation of the main control module 300, and provides working power to the main control module 300 and its related control circuits through the second positive connection terminal B1.

[0031] When the main control module 300 needs to control the LED module to turn on, it outputs a corresponding trigger signal to the isolation control module 200. Upon receiving the trigger signal, the isolation control module 200, while internally implementing electrical isolation, connects the first conducting terminal 201 and the second conducting terminal 202, closing the current loop of the LED module and causing it to start emitting light. When the main control module 300 needs to control the LED module to turn off, it outputs a corresponding trigger signal to the isolation control module 200, which then disconnects the electrical connection between the first conducting terminal 201 and the second conducting terminal 202, breaking the current loop of the LED module and stopping it from working.

[0032] In this way, the driving circuit of the LED module and the control circuit of the main control module 300 are completely electrically isolated and do not share a ground wire. Even if the LED module generates ground potential fluctuations under high current operation, these fluctuations will not be transmitted to the main control module 300 through the shared ground wire, thus avoiding interference with the main control module 300. This isolation control method effectively solves the problem of ground interference that may occur when the LED module operates under high brightness and high power conditions.

[0033] The beneficial effects of this utility model are as follows: by setting up independent first power conversion module 110 and second power conversion module 120, and using isolation control module 200 to realize electrical isolation control between LED module and main control module 300, the driving circuit of LED module and control circuit of main control module 300 do not share ground wire, thereby effectively eliminating the interference of ground potential fluctuation generated by LED module under high current working state to main control module 300, and improving the stability and reliability of the entire control system.

[0034] In some embodiments, the first power conversion module 110 generates a first voltage value for powering the main control module 300, and the second power conversion module 120 generates a second voltage value for powering the isolation control module 200. The first voltage value is less than the second voltage value.

[0035] In this embodiment, the first power conversion module 110 can output a lower stable voltage, such as 3.3V or 5V, specifically for providing operating power to the main control module 300. The main control module 300 can employ a low-voltage microcontroller or dedicated control chip, such as an STM32 series microcontroller, an Arduino controller, or an AW2026 LED control chip. These devices typically operate most efficiently at 3.3V or 5V and have low power consumption.

[0036] The second power conversion module 120 outputs a higher voltage, such as 12V, 24V, or higher, to provide operating power to the LED module and the isolation control module 200. Since LED modules, especially high-brightness LEDs or LED light groups, typically require higher driving voltages, the second voltage value needs to be sufficiently high to ensure the LED module can operate normally and achieve the expected brightness effect. The isolation control module 200, as the interface between the LED module and the main control module 300, needs to adapt to the electrical characteristics of both ends; therefore, it also operates using the higher voltage provided by the second power conversion module 120.

[0037] In this way, the most suitable operating voltage is provided according to the electrical requirements of different modules. On the one hand, this ensures that the main control module 300 operates stably and efficiently under low voltage, and on the other hand, it meets the higher drive voltage requirements of the LED modules. At the same time, power isolation further enhances the electrical isolation performance of the system, effectively preventing interference from high-voltage and high-current components to the low-voltage control circuit, thereby improving the reliability and safety of the entire system.

[0038] In addition, this configuration facilitates power consumption optimization and thermal management of the system. The low-voltage control section can adopt a more energy-efficient design, while the high-voltage drive section can be targeted for heat dissipation and current management.

[0039] See Figure 2In this embodiment, the isolation control module 200 includes: Optical coupler U1 includes a first pin U11, a second pin U12, a third pin U13 and a fourth pin U14. The first pin U11 is electrically connected to the second positive connection terminal B1, the second pin U12 is electrically connected to the main control module 300, and the third pin U13 is electrically connected to the first input terminal 203. Switch Q1, the drain of switch Q1 is electrically connected to the first conducting terminal 201, the source of switch Q1 is electrically connected to the first negative terminal A2, and the gate of switch Q1 is electrically connected to the fourth pin U14.

[0040] In this embodiment, the isolation control module 200 can be built from an optocoupler U1 and a switching transistor Q1. The optocoupler U1 can be a common optocoupler such as PC817, TLP521, or 4N35, and the switching transistor Q1 can be an NMOS transistor such as IRF540N, IRFZ44N, or 2N7000. In this way, complete electrical isolation between the LED driving circuit and the control circuit can be achieved, effectively preventing common ground interference.

[0041] In this embodiment, the main control module 300 can use the AW2026 control chip. The AW2026 is an integrated chip specifically designed for LED control, featuring multi-channel control, PWM dimming, and rich display effects, making it suitable for various LED display and lighting applications.

[0042] The control loop can use the power supplied by the second power conversion module 120. The first pin U11 of the optocoupler U1 is connected to the second input terminal 204 (the second input terminal 204 is connected to the second positive connection terminal B1, through which the operating power can be obtained). One output pin of the main control module 300 is connected to the second pin U12 of the optocoupler U1. When the main control module 300 needs to control the LED module to turn on, the current flows through the following path: second positive connection terminal B1, second input terminal 204, first pin U11 of the optocoupler U1, internal LED of the optocoupler U1, second pin U12 of the optocoupler U1, main control module 300 → second negative connection terminal.

[0043] For example, if the main control module 300 sets the output port of the second pin U12 of the optocoupler U1 to a low level (internal conduction grounded), the current flows sequentially from the second positive connection terminal B1, the second input terminal 204, and the first pin U11 through the light-emitting diode inside the optocoupler U1, and then flows through the second pin U12 to the main control module 300, finally reaching the second negative connection terminal B2, forming a complete circuit and lighting up the light-emitting diode inside the optocoupler U1.

[0044] The LED driving circuit uses power supplied by the first power conversion module 110. Based on the working principle of optocoupler U1, since the third pin U13 is electrically connected to the first input terminal 203, and the first input terminal 203 is electrically connected to the first positive connection terminal A1, and obtains operating power from the first positive connection terminal A1, when the light-emitting diode inside optocoupler U1 is lit, the phototransistor or photosensitive transistor of optocoupler U1 is activated, making the third pin U13 and the fourth pin U14 conduct. In this way, the power supply voltage of the first positive connection terminal A1 can be transmitted to the gate of the switching transistor Q1 through the first input terminal 203, the third pin U13 of optocoupler U1, and the fourth pin U14 of optocoupler U1.

[0045] Since an NMOS transistor is used, when the gate receives a sufficient positive voltage, the switch Q1 is turned on, which forms a low-resistance path between the first conducting terminal 201 and the second conducting terminal 202, thereby electrically connecting the LED module to the first negative connection terminal A2, and the LED module begins to work normally and emit light.

[0046] When the main control module 300 needs to turn off the LED module, it only needs to set its output port to a high level or a high impedance state to cut off the current path of the light-emitting diode inside the optocoupler U1. The photosensitive part of the optocoupler U1 then loses its excitation and turns off. The gate voltage of the switching transistor Q1 decreases, the switching transistor Q1 turns off, the electrical connection between the LED module and the first negative connection terminal A2 is cut off, and the LED module stops working.

[0047] By combining the optocoupler U1 and the switching transistor Q1, complete opto-isolation is achieved between the control circuit and the LED driver circuit. The control signal is transmitted from the control circuit to the driver circuit only in the form of light, without any electrical connection, thus effectively avoiding grounding interference. Even if the LED module generates ground potential fluctuations under high current operation, they will not be transmitted to the main control module 300 through the common ground wire, ensuring the stability and reliability of the entire system.

[0048] See Figure 3 In this embodiment, the number of isolation control modules 200 is set to multiple, and the first conducting terminal 201 of the multiple isolation control modules 200 is used to electrically connect different LED modules.

[0049] In this embodiment, there can be multiple LED modules, such as LED modules of different colors (e.g., red, green, blue, yellow, etc.), and there are also multiple corresponding isolation control modules 200. That is, each LED module has a corresponding isolation control module 200 to control it, forming a multi-channel independent control structure.

[0050] In this embodiment, multiple independent LED control channels can be configured, each containing an LED module and a corresponding isolation control module 200. For example, three channels can be configured: a red LED module, a green LED module, and a blue LED module, each corresponding to a separate isolation control module 200. The first conducting terminal 201 of each isolation control module 200 is connected to the corresponding LED module, the second conducting terminal 202 is connected to the first negative connection terminal A2, the first input terminal 203 is connected to the first positive connection terminal A1, and the second input terminal 204 is connected to the second positive connection terminal B1.

[0051] The main control module 300 can be connected to various isolation control modules 200 through multiple output ports to achieve independent control of LED modules of different colors. For example, pin D1 of the main control module 300 can be connected to the isolation control module 200 that controls the red LED module, pin D2 can be connected to the isolation control module 200 that controls the green LED module, and pin D3 can be connected to the isolation control module 200 that controls the blue LED module.

[0052] Each isolation control module 200 can adopt the optocoupler U1 and switch Q1 structure described in the previous embodiment, or other types of isolation devices can be selected according to actual needs. The optocoupler U1 can be a multi-channel optocoupler U1 such as TLP280-4, and the switch Q1 can be an NMOS transistor of appropriate specifications according to the current requirements of each LED module.

[0053] In this multi-channel structure, the main control module 300 can be programmed to independently control each LED module, including switching, brightness adjustment, and flashing effects. For example, the following control methods can be implemented: Monochrome control: The main control module 300 can individually control the on / off state of a single LED module, such as lighting only the red LED or only the green LED.

[0054] Color mixing control: The main control module 300 can simultaneously control the switching status of multiple LED modules to achieve color mixing effects, such as simultaneously lighting up red and green LED modules to produce a yellow light effect.

[0055] Sequential control allows the main control module 300 to control each LED module sequentially according to a preset program, achieving dynamic display effects such as flowing lights and running lights.

[0056] In addition, the main control module 300 can control the duty cycle of each LED module through PWM output to achieve brightness adjustment, thereby realizing richer color mixing and gradient effects.

[0057] The control principle of each LED module is the same as that of the single-channel embodiment, which uses the isolation control module 200 to control the conduction or disconnection of the LED module's current loop. Since each LED module has an independent isolation control module 200, even if one LED module operates under high current and causes grounding fluctuations, it will not affect the normal operation of other LED modules, nor will it affect the main control module 300 through a common ground.

[0058] Continue reading Figure 2 In this embodiment, the isolation control module 200 further includes a voltage divider module 210, which is electrically connected between the fourth pin U14 and the gate of the switching transistor Q1.

[0059] Furthermore, the voltage divider module 210 includes a first resistor R1 and a second resistor R2. The gate of the switching transistor Q1 is electrically connected to the fourth pin U14 via the first resistor R1, and the gate of the switching transistor Q1 is also electrically connected to the first negative connection terminal A2 via the second resistor R2.

[0060] In this embodiment, the voltage divider module 210 forms a voltage divider network through the first resistor R1 and the second resistor R2, appropriately reducing the voltage output from the fourth pin U14 of the optocoupler U1 before supplying it to the gate of the switch Q1. This ensures that the switch Q1 operates within a suitable gate voltage range, preventing damage or instability caused by excessively high gate voltage. Different models of NMOS switches Q1 have different gate threshold voltages and maximum gate-source voltages; by appropriately designing the resistance ratio of the voltage divider network, different types of switches Q1 can be adapted.

[0061] In addition to its voltage divider function, the first resistor R1 also serves as a current limiter, preventing excessive gate charging current during transient processes and improving the system's transient immunity. The second resistor R2 provides a discharge path from the gate to ground, ensuring that the gate voltage drops rapidly when the optocoupler U1 is disconnected, thus accelerating the turn-off speed of the switching transistor Q1.

[0062] When the internal LED of optocoupler U1 is lit, the photosensitive part of optocoupler U1 is activated, and conduction occurs between the third pin U13 and the fourth pin U14. The voltage at the first input terminal 203 is then transmitted to the fourth pin U14 through optocoupler U1. This voltage is then divided by a voltage divider network consisting of the first resistor R1 and the second resistor R2, generating an appropriate gate voltage that is applied to the gate of the switching transistor Q1. When this gate voltage exceeds the threshold voltage of the switching transistor Q1, the switching transistor Q1 conducts, forming a low-resistance path between the first conducting terminal 201 and the second conducting terminal 202, and the LED module begins to operate.

[0063] When the internal LED of optocoupler U1 is turned off, the photosensitive part of optocoupler U1 is shut down, and the connection between the third pin U13 and the fourth pin U14 is broken. At this time, the charge on the gate of switching transistor Q1 is quickly discharged to the first negative connection terminal A2 through the second resistor R2, the gate voltage drops rapidly, switching transistor Q1 is turned off, and the LED module stops working.

[0064] In some embodiments, the LED module is at least one of red LEDs, green LEDs, and yellow LEDs.

[0065] In this embodiment, the LED isolation control circuit can be configured with LED modules of different colors, including red LEDs, green LEDs, and yellow LEDs, or combinations thereof. These LED modules of different colors can be flexibly configured according to actual application requirements to achieve different indication, lighting, or display functions.

[0066] Red LED modules typically use LED chips with wavelengths between 620-630nm, emitting bright red light with good penetration and visibility. Green LED modules usually use LED chips with wavelengths between 520-530nm, emitting bright green light that is comfortable for the eyes and offers good visibility. Yellow LED modules typically use LED chips with wavelengths between 585-595nm, emitting bright yellow light that provides good warning in certain environments.

[0067] These different colored LED modules can be implemented using a single high-power LED or multiple low-power LEDs connected in series and parallel. Depending on the brightness and power requirements, each color of LED module may require different drive current and voltage. For example, red LEDs typically have a lower forward voltage (approximately 1.8-2.2V), while green LEDs have a higher forward voltage (approximately 3.0-3.4V).

[0068] In some embodiments, the main control module 300 includes multiple control pins, which are used to electrically connect to different isolated control modules 200.

[0069] In this embodiment, the main control module 300 is designed with multiple independent control pins, each of which is dedicated to controlling a corresponding isolated control module 200, thereby achieving independent control of multiple LED modules. This multi-control pin design makes the system more flexible and scalable, and can adapt to more complex LED control requirements.

[0070] The main control module 300 can use a highly integrated microcontroller, such as the STM32 series, Arduino series, ESP32 series, or a dedicated LED control chip such as AW2026 or TLC5940. These controllers typically have abundant GPIO port resources and can provide multiple output pins for controlling different isolated control modules 200.

[0071] In terms of specific connection methods, each control pin of the main control module 300 is connected to the second pin U12 of the optocoupler U1 in the corresponding isolation control module 200, forming multiple independent control loops. For example, pin D1 of the main control module 300 can be connected to the isolation control module 200 that controls the red LED module, pin D2 can be connected to the isolation control module 200 that controls the green LED module, and pin D3 can be connected to the isolation control module 200 that controls the yellow LED module.

[0072] The present invention further proposes a control device, including the LED isolation control circuit of the foregoing embodiment. The specific structure of the LED isolation control circuit is as described in the above embodiment. Since the present control device adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0073] In this embodiment, the control device is a complete system-level implementation based on the aforementioned LED isolation control circuit technology. It mainly includes a first power conversion module 110 and a second power conversion module 120, responsible for providing a stable and reliable power supply to the entire system. The first power conversion module 110 provides a voltage suitable for the LED module's operation, and the second power conversion module 120 provides a voltage suitable for the control circuit's operation. The two are electrically isolated to avoid mutual interference.

[0074] The main control section employs a main control module 300 with multiple control pins, which can be an STM32 series microcontroller or a dedicated LED control chip such as AW2026. The main control module 300 controls different isolated control modules 200 by outputting trigger signals through multiple control pins according to a preset program or external input signals.

[0075] The isolation control section may include multiple isolation control modules 200, each module consisting of an optocoupler U1, a switching transistor Q1, and a voltage divider module 210. The isolation control module 200 receives trigger signals from the main control module 300 and controls the operating state of the LED module through opto-isolation, effectively avoiding common-ground interference. By integrating the technical solutions of the aforementioned embodiments into a complete control device, this invention provides an ideal solution for various application scenarios requiring high-reliability LED control.

[0076] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. An LED isolation control circuit, applied to an LED module, characterized in that, include: A power management unit, comprising a first power conversion module and a second power conversion module, wherein the first power conversion module includes a first positive connection terminal and a first negative connection terminal, and the second power conversion module includes a second positive connection terminal and a second negative connection terminal, and one end of the LED module is electrically connected to the first positive connection terminal. An isolation control module includes a first conducting terminal, a second conducting terminal, a first input terminal, and a second input terminal. The first conducting terminal is electrically connected to the other end of the LED module, the second conducting terminal is electrically connected to the first negative connection terminal, the first input terminal is electrically connected to the first positive connection terminal, and the second input terminal is electrically connected to the second positive connection terminal. The isolation control module is used to connect or disconnect the electrical connection between the LED module and the first negative connection terminal. The main control module is electrically connected to the second positive connection terminal, the second negative connection terminal and the isolation control module respectively. The main control module is configured to output a trigger signal to control the operation of the isolation control module.

2. The LED isolation control circuit according to claim 1, characterized in that, The first power conversion module generates a first voltage value to power the main control module, and the second power conversion module generates a second voltage value to power the isolation control module. The first voltage value is less than the second voltage value.

3. The LED isolation control circuit according to claim 1, characterized in that, The isolation control module includes: An optocoupler, comprising a first pin, a second pin, a third pin, and a fourth pin, wherein the first pin is electrically connected to the second input terminal, the second pin is electrically connected to the main control module, and the third pin is electrically connected to the first input terminal; The switching transistor has its drain electrically connected to the first on terminal, its source electrically connected to the first negative terminal, and its gate electrically connected to the fourth pin.

4. The LED isolation control circuit according to claim 3, characterized in that, The isolation control module is configured to be multiple, and the first conducting terminal of the multiple isolation control modules is used to electrically connect to different LED modules.

5. The LED isolation control circuit according to claim 3 or 4, characterized in that, The isolation control module also includes a voltage divider module, which is electrically connected between the fourth pin and the gate of the switching transistor.

6. The LED isolation control circuit according to claim 5, characterized in that, The voltage divider module includes a first resistor and a second resistor. The gate of the switching transistor is electrically connected to the fourth pin via the first resistor, and the gate of the switching transistor is also electrically connected to the first negative connection terminal via the second resistor.

7. The LED isolation control circuit according to claim 1, characterized in that, The main control module is an AW2026 chip.

8. The LED isolation control circuit according to claim 1, characterized in that, The LED module is at least one of red LED lights, green LED lights, and yellow LED lights.

9. The LED isolation control circuit according to claim 1, characterized in that, The main control module includes multiple control pins, which are used to electrically connect to different isolated control modules.

10. A control device, characterized in that, Includes the LED isolation control circuit as described in any one of claims 1 to 9.

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