Driving circuit applied to LED lighting device
By integrating an isolated dimming module in the LED lighting device driving circuit, electrical isolation is achieved using the first circuit and the second circuit, the problem of electrical isolation in the prior art increases volume and safety risks is solved, and a smaller driving is achieved Circuit size and higher economic benefits.
Patent Information
- Application Number
- CN202323072329.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-10
- Filing Date
- 2023-11-14
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-11-14
AI Technical Summary
When the existing LED lighting device driver circuit is electrically isolated, the volume and soldering points of the circuit board are increased, resulting in increased safety risks and costs.
An integrated isolation dimming module is designed to realize electrical isolation through the first circuit and the second circuit, reduce the complexity and number of components of the external isolation circuit, and integrate it into the driving circuit.
It reduces the volume and cost of the driver circuit, improves reliability and safety, optimizes the line layout, reduces welding points and wiring, and improves economic benefits.
Smart Images
Figure CN222283522U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of driving power supplies, and in particular to a driving circuit applied to an LED lighting device. Background Art
[0002] As a light source, LED is gradually replacing traditional lighting with its advantages of being green, environmentally friendly, low-carbon and energy-saving. As people's awareness of energy conservation and environmental protection increases, LED dimming is required in some occasions. Currently, common dimming types include: thyristor dimming, resistor dimming, analog (1-10V) dimming, and PWM dimming.
[0003] In the dimming system, in order to ensure the safety of users and equipment and to improve the stability of the circuit, the circuit needs to be electrically isolated. Common electrical isolation methods include photoelectric coupling isolation, magnetic isolation, and physical isolation. Adding isolation circuits often increases the number of solder joints and the size of the circuit board, thereby increasing safety risks.
[0004] Therefore, a new driving circuit applied to LED lighting devices is needed to solve the above problems. Utility Model Content
[0005] In view of the shortcomings of the above-mentioned related art, the object of the present invention is to provide a driving circuit for an LED lighting device, characterized in that the driving circuit includes: a rectifier module, which is used to receive an external power signal and rectify it to generate a rectified signal; a filter module, which is electrically connected to the rectifier module, which is used to receive the rectified signal and filter it to generate a filtered signal; a control module, which is electrically connected to the filter module, which is used to adjust and output a driving signal to the LED load; and an isolated dimming module, which is coupled to the control module, which is used to receive a first dimming instruction through a first pin and transmit a signal related to the first dimming instruction through a second pin. The second dimming instruction of the first dimming instruction is sent to the control module, wherein the control module adjusts the driving signal according to the second dimming instruction so that the LED load adjusts the luminous brightness in response to the second dimming instruction, wherein the isolated dimming module includes: a first loop, coupled to the first pin, for receiving and processing the first dimming instruction, wherein the first loop is coupled to a first ground terminal; and a second loop, coupled to the second pin, for generating the second dimming instruction in response to the first dimming instruction, wherein the second loop is coupled to a second ground terminal, wherein the first ground terminal and the second ground terminal are electrically independent.
[0006] In certain embodiments disclosed in the first aspect of the present application, the first circuit includes: a signal processing unit having an input end and an output end, the signal processing unit being used to convert a first dimming instruction received from the input end into a dimming signal, and output the dimming signal from the output end; and a first isolation component, one end of the first isolation component being coupled to the output end of the signal processing unit to receive the first dimming signal and form a second dimming signal, and the other end of the first isolation component being coupled to the first ground end through a third pin of the isolated dimming module.
[0007] In certain embodiments disclosed in the first aspect of the present application, the second circuit includes: a voltage conversion unit, whose input end is coupled to the second pin, for converting the first voltage into the execution voltage required inside the isolated dimming module; a second isolation component, one end of which is coupled to the voltage conversion unit, for synchronously receiving the first dimming signal of the first isolation component to form a second dimming signal; a switching device, the other end of the second isolation component is coupled to the first end of the switching device, and the second end of the second isolation component is coupled to the voltage conversion unit; a resistor, one end of which is coupled to the third end of the switching device, and the other end is coupled to the second ground end, wherein the third end of the switching device is electrically connected to the fourth pin of the isolated dimming module.
[0008] In certain embodiments disclosed in the first aspect of the present application, the second circuit includes: a voltage conversion unit, whose input end is coupled to the second pin, for converting the first voltage into the execution voltage required inside the isolated dimming module; a second isolation component, one end of which is coupled to the voltage conversion unit, for synchronously receiving the dimming signal of the first isolation component, and the other end is coupled to the fourth pin of the isolated dimming module.
[0009] In certain embodiments disclosed in the first aspect of the present application, the fourth pin is coupled to the control module through a switching device, wherein a first end of the switching device is coupled to the fourth pin to receive a second dimming instruction; a second end is coupled to a communication pin of the control module; and a third end is coupled to the second ground end.
[0010] In certain embodiments disclosed in the first aspect of the present application, the first dimming instruction includes: a 0-100% PWM signal, a resistance dimming signal, and a 0-10V analog dimming signal.
[0011] In certain embodiments disclosed in the first aspect of the present application, the second dimming instruction is a PWM dimming signal.
[0012] In certain embodiments disclosed in the first aspect of the present application, the first isolation component includes a first inductor, and the second isolation component includes a second inductor, wherein the first inductor is coupled to the signal processing unit and the first ground terminal to obtain the first dimming signal; one end of the second inductor is coupled to the voltage conversion unit, and the other end is coupled to the second ground terminal through the switching device.
[0013] In certain embodiments disclosed in the first aspect of the present application, the first isolation component includes a first relay, and the second isolation component includes a second relay, wherein the first relay is coupled to the signal processing unit to obtain the first dimming signal; one end of the second relay is coupled to the voltage conversion unit to obtain the execution voltage, and the other end is coupled to the second ground end through the switching device.
[0014] The first isolation component includes a first light-emitting diode, and the second isolation component includes a second light-emitting diode, wherein the first light-emitting diode is coupled to the signal processing unit to obtain the first dimming signal; one end of the second light-emitting diode is coupled to the voltage conversion unit to obtain the execution voltage, and the other end thereof is coupled to the second ground end through the switching device.
[0015] In certain embodiments disclosed in the first aspect of the present application, the first isolation component and the second isolation component constitute an isolation unit, the dimming signal of the first isolation component is synchronized on the second isolation component, and the switching device is triggered to transmit the second dimming instruction to the control module.
[0016] In certain embodiments disclosed in the first aspect of the present application, the isolated dimming module is a chip.
[0017] Beneficial Effects
[0018] Compared with the prior art, the dimming module in the driving circuit of the LED lighting device provided by the present application has the following advantages:
[0019] 1) The dimming module in the LED driving circuit integrates an isolation circuit to reduce the size of the driving circuit.
[0020] 2) Integrating the isolation circuit into the dimming module can optimize the circuit layout of the driving circuit, reduce the wiring and welding points when welding externally, and improve the reliability of the driving circuit.
[0021] 3) Integrating the isolation circuit into the drive circuit can reduce costs and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.
[0023] Figure 1 This is a schematic diagram of an LED lighting device and a driving circuit according to an embodiment of the present application;
[0024] Figure 2 This is a schematic diagram of the connection relationship of some modules in an embodiment of the present application;
[0025] Figure 3 for Figure 2 A schematic diagram of the internal circuit of a dimming module according to an embodiment of the present invention;
[0026] Figure 4 for Figure 2 A schematic diagram of an internal circuit of a dimming module according to another embodiment;
[0027] Figure 5 for Figure 2 A schematic diagram of an internal circuit of a dimming module according to another embodiment of the present invention; and
[0028] Figure 6 The module connection relationship of another embodiment of the present application is a schematic diagram. DETAILED DESCRIPTION
[0029] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.
[0030] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.
[0031] Reference Figure 1 , Figure 1It is a schematic diagram of an LED lighting device and a driving circuit of an embodiment of the present application. The LED lighting device includes a driving circuit 00 and an LED load 50, wherein the driving circuit 00 includes a rectifier module 20, a filter module 30, a control module 40 and a dimming module 60. The driving circuit 00 has an input end and an output end, the input end is electrically connected to an AC power source 10, and the output end is electrically connected to the LED load 50. The driving circuit 00 plays the role of converting an external power signal connected from an external AC power source 10 into a driving signal required by the LED load 50. When the driving circuit 00 is used for a straight tube lamp in an LED lighting device, the driving circuit 00 is configured on a circuit board, and the power board is configured in the lamp holder of the straight tube lamp by snapping, bonding or other methods.
[0032] The rectifier module 20 is used to receive an external power signal and rectify it to generate a rectified signal. The rectifier module 20 can be a half-wave rectifier, a full-wave rectifier, a full-wave bridge rectifier or a voltage doubler rectifier, which is not limited in this application. The AC signal output by the AC power supply 10 is rectified by the rectifier module 20 to generate a DC signal. The input end of the rectifier module 20 is electrically connected to the AC power supply 10. In this embodiment, the AC power supply 10 can be, for example, a mains voltage, that is, an AC signal of 100V-320V, 50 / 60Hz, including each voltage value, such as 101V, 102V, 103V...
[0033] The filter module 30 is electrically connected to the rectifier module 20 to receive the rectified signal and perform filtering to generate a filtered signal for supplying to the subsequent circuit. In the filter module 30, a device with special impedance characteristics to AC power can be used to construct a filter circuit, for example, a capacitor filter circuit, a π-type RC filter circuit (also called a π-type resistor and capacitor filter circuit), a π-type LC filter circuit (also called a π-type inductor and capacitor filter circuit), and an electronic filter circuit. In this embodiment, one of the above-mentioned filter circuits can be selected to constitute the filter module 30.
[0034] The control module 40 is electrically connected to the filter module 30 to control and output a driving signal. For example, if the control module 40 is composed of a boost topology, the output voltage value of the driving power supply 00 of the LED lighting device is greater than the input voltage value; if the control module 40 is composed of a buck topology, the output voltage value of the driving power supply 00 of the LED lighting device is less than the input voltage value. The control module 40 has an input end and an output end, wherein the input end is electrically connected to the output end of the filter module 30, and the output end is electrically connected to the LED load 50. The control module 40 includes a processing unit 41, which includes an input pin 411 of a dimming signal. The processing unit 41 processes the dimming signal received from the input pin 411, so that the control module 40 adjusts the output voltage according to the received dimming signal to control the luminous degree of the LED load 50.
[0035] refer to Figure 2 , showing a schematic diagram of the connection relationship of some modules in an embodiment of the present application. The dimming module 60 includes at least four external pins 61 and an internal unit 62. The external pin 61 serves as a transmission component of the internal unit 62 and plays a role in signal transmission between the internal unit 62 and the outside of the dimming module 60. The external pin 61 includes an input pin 611 of a first voltage, an output pin 612 of a second dimming instruction, an input pin 613 of a first dimming instruction, and a ground pin 614. The input pin 611 of the first voltage is electrically connected to the first voltage vbus in the main circuit. The voltage value of the first voltage vbus usually uses the output voltage of the filter module 30 or the output voltage of the control module 40; the output pin 612 of the second dimming instruction is electrically connected to the input pin 411 of the second dimming instruction of the processing unit 41; the input pin 613 of the first dimming instruction is electrically connected to the external dimming signal module 70 to obtain the first dimming instruction; the ground pin 614 is connected to the first reference ground GND1. To simplify the description, it can be directly expressed as "pin XXX" below.
[0036] Continue to refer Figure 2 , the dimming signal sent by the external dimming signal module 70 to the dimming module 60 is a first dimming instruction, that is, the dimming signal transmitted by the pin 613 of the dimming module 60 is a first dimming instruction, wherein the first dimming instruction can be a 0-10V analog dimming signal, a 0-100% PWM signal or a resistance dimming signal. The internal unit 62 of the dimming module 60 is used to convert the first dimming instruction into a second dimming instruction that can be received by the processing unit 41, and is configured with a voltage conversion unit 621, a signal processing unit 622 and an isolation unit 623. Among them, the voltage conversion unit 621 is used to convert the first voltage vbus in the main circuit into the execution voltage required by the internal unit of the dimming module 60; the signal processing unit 622 is used to convert the received first dimming instruction into a first dimming signal that can be recognized by the isolation unit 623; the isolation unit 623 has a first isolation component 623a and a second isolation component 623b, and the two isolation components are electrically isolated.
[0037] The internal unit 62 of the dimming module 60 further includes: a switch device Q and a resistor R. The first end of the switch device Q is coupled to the voltage conversion unit 621, the second end is coupled to the resistor R, and the third end is coupled to the isolation unit 623. One end of the resistor R is coupled to the switch device Q, and the other end is coupled to the second reference ground GND2, wherein one end connected to the switch device Q is also coupled to the pin 621 to output the second dimming instruction.
[0038] One end of the signal processing unit 622 is coupled to the pin 613 to receive the first dimming instruction, and the other end is coupled to the first isolation component 623a to output the first dimming signal to the first isolation component 623a. The first isolation component 623a is further coupled to the first reference ground GND1 through the pin 614. This loop can be called the first loop. The input end of the voltage conversion unit 621 is coupled to the pin 611 to receive the first voltage vbus, and the output end is coupled to the switch device Q and the second isolation component 623b to provide the execution voltage to the switch device Q and the second isolation component 623b. The switch device Q is further coupled to the pin 612 and coupled to the second reference ground GND2 through the resistor R. This loop can be called the second loop. The first reference ground GND1 and the second reference ground GND2 are electrically isolated (independent), which can also be said that the first loop and the second loop are electrically isolated (independent).
[0039] refer to Figure 3 , Figure 3 for Figure 2 A schematic diagram of the internal circuit of a dimming module according to an embodiment, wherein the internal unit 62 includes a voltage conversion unit 621, a signal processing unit 622, and an isolation unit 623. The voltage conversion unit 621 includes a first input terminal and a first output terminal, and is used to provide the execution voltage required inside the dimming module 60, wherein the first input terminal is electrically connected to the input pin 611 of the first voltage, and the first output terminal is electrically connected to the switch device Q. The voltage conversion module 621 converts the first voltage vbus obtained by the input pin 611 of the first voltage into the second voltage VCC required by the switch device Q. The signal processing module 622 has a first input terminal and a first output terminal, wherein the first input terminal is electrically connected to the input pin 613 of the first dimming instruction, and the first output terminal is electrically connected to the first isolation component 623a. The signal processing unit 622 converts the first dimming instruction obtained from the input pin 613 of the first dimming instruction into a first dimming signal and outputs it to the first isolation component 623a; the input end of the first isolation component 623a receives the first dimming signal from the output end of the signal processing unit to form a second dimming signal, and the second isolation component 623b receives the second dimming signal to generate a third dimming signal, which is adjusted to the second dimming instruction through the switch device Q, that is, the pin 612 outputs the second dimming instruction. The dimming module can be a chip, or it can be said that the signal processing unit and the isolation unit are integrated in the same chip. In some embodiments, the signal processing unit, the isolation unit and the voltage conversion unit are all integrated in the same chip.
[0040] In some embodiments, Figure 3As shown, the first isolation component 623a includes a first inductor L1, the second isolation component 623b includes a second inductor L2, and the internal unit includes a switch device Q and a first resistor R. One end of the first inductor L1 is electrically connected to the first output end of the signal processing unit 622 to obtain a first dimming signal, and the other end is electrically connected to the first reference ground GND1 through a pin 614. One end of the second inductor L2 is electrically connected to the first input end (trigger end) of the switch device Q, and the other end is electrically connected to the second reference ground GND2. The first inductor L1 and the second inductor L2 form magnetic coupling isolation, and the second dimming signal of the first inductor L1 is converted into a third dimming signal synchronously on the second inductor L2 to ensure the safety of personnel and equipment and improve the anti-interference ability of the circuit. The second input terminal of the switch device Q is electrically connected to the first output terminal of the voltage conversion unit 621 to obtain the second voltage VCC; the output terminal of the switch device Q is electrically connected to the second dimming instruction output pin 612; the first input terminal (trigger terminal) of the switch device Q is electrically connected to one end of the second inductor L2. When a signal of the second inductor L2 triggers the first input terminal (trigger terminal) of the switch device Q, the switch device Q is turned on, and the third dimming signal is adjusted to the second dimming instruction and transmitted to the second dimming instruction output pin 612, and then transmitted to the processing unit 41. The output terminal of the switch device Q is also electrically connected to one end of the first resistor R, and the other end of the first resistor R is electrically connected to the second ground pin GND2. The first resistor R is used to increase the bias stability of the switch device Q.
[0041] The embodiment of the present application proposes a driving circuit for an LED lighting device. By integrating a magnetic coupling isolation module into a dimming module, a first circuit and a second circuit that are isolated from each other are formed inside the dimming module, thereby replacing the original complex external isolation circuit, reducing the number of peripheral circuit components and reducing the volume of the overall driving circuit, which not only improves the safety of the driving circuit but also reduces the circuit cost.
[0042] refer to Figure 4, which is a schematic diagram of the internal circuit of a dimming module according to another embodiment of the present application. The main difference between this embodiment and the above-mentioned embodiment lies in the internal circuit structure of the first isolation component 623a and the second isolation component 623b in the isolation unit 623, and the coupling form of the second isolation component 623b and the voltage conversion unit 621. In this embodiment, the first isolation component 623a includes a first relay S1, the second isolation component 623b includes a second relay S2, and the voltage conversion unit 621 also includes a second output terminal, the second output terminal is electrically connected to one end of the second relay S2, and is used to output a third voltage VDD that can trigger the second relay S2 to work. The other end of the second relay S2 is electrically connected to the first input terminal (trigger terminal) of the switching device Q. One end of the first relay S1 is electrically connected to the first output terminal of the signal processing unit 622 to obtain a first dimming signal and generate a second dimming signal, and the other end is electrically connected to one end of the second resistor Rs, and the other end of the second resistor Rs is electrically connected to the first reference ground GND1 through the pin 614. The second resistor Rs plays a role in current limiting. The first relay S1 and the second relay S2 form relay isolation. The second dimming signal of the first relay S1 is converted into a third dimming signal and synchronized on the second relay S2. Subsequently, the third dimming signal is adjusted to a second dimming instruction through the switching device Q and output from pin 612 to ensure the safety of personnel and equipment and improve the anti-interference ability of the circuit.
[0043] refer to Figure 5, which is a schematic diagram of the internal circuit of a dimming module according to another embodiment of the present application. The main difference between this embodiment and the above-mentioned embodiment is that the internal circuit structures of the first isolation component 623a and the second isolation component 623b in the isolation unit 623 are different, and the coupling form of the second isolation component 623b and the voltage conversion unit 621 is different. The voltage conversion unit 621 also includes a second output terminal, and the voltage conversion unit 621 converts the first voltage vbus into a third voltage VDD, and transmits it to the anode end of the second light-emitting diode D2 through its second output terminal. The cathode end of the second light-emitting diode D2 is electrically connected to the first input end (trigger end) of the switching device Q. The anode end of the first light-emitting diode D1 is electrically connected to the first output end of the signal processing unit 622 to obtain the first dimming signal and generate the second dimming signal, and its cathode end is electrically connected to one end of the second resistor Rs; the other end of the second resistor Rs is electrically connected to the ground pin 614, and the second resistor Rs plays a role in current limiting. The first light-emitting diode D1 and the second light-emitting diode D2 form an optical coupling isolation, and the second dimming signal of the first light-emitting diode D1 is converted into a third dimming signal and synchronized on the second light-emitting diode D2. When the second light-emitting diode D2 receives the signal sent by the first light-emitting diode D1, the second light-emitting diode D2 is turned on to trigger the switch device Q to generate a second dimming instruction and transmit it to the second dimming instruction output pin 612. The circuit isolation method can effectively ensure the safety of personnel and equipment and improve the anti-interference ability of the circuit.
[0044] The embodiment of the present application proposes an LED lighting device and a driving circuit. By integrating a signal isolation module into a dimming module, the first circuit inside the dimming module is isolated from the second circuit, replacing the original complex external isolation circuit, reducing the number of peripheral circuit components and reducing the overall driving circuit volume, which not only improves the safety of the driving circuit but also reduces the circuit cost.
[0045] refer to Figure 6, showing a schematic diagram of the connection relationship of some modules of another embodiment of the present application. The dimming module 60 includes at least four external pins 61 and an internal unit 62. The external pin 61 serves as a transmission component of the internal unit 62 and plays a role in signal transmission between the internal unit 62 and the outside of the dimming module 60. The external pin 61 includes an input pin 611 of a first voltage, an output pin 612 of a second dimming instruction, an input pin 613 of a first dimming instruction, and a ground pin 614. The input pin 611 of the first voltage is electrically connected to the first voltage vbus in the main circuit. The voltage value of the first voltage vbus usually uses the output voltage of the filter module 30 or the output voltage of the control module 40; the output pin 612 of the second dimming instruction is coupled to the input pin 411 of the second dimming instruction of the processing unit 41 through a switch device Q, and the switch device Q is coupled to the second reference ground GND2; the input pin 613 of the first dimming instruction is electrically connected to the external dimming signal module 70 to obtain the first dimming instruction; the ground pin 614 is connected to the first reference ground GND1. To simplify the description, it can be directly expressed as "pin XXX" below.
[0046] Continue to refer Figure 6 , the dimming signal sent by the external dimming signal module 70 to the dimming module 60 is a first dimming instruction, that is, the dimming signal transmitted by the pin 613 of the dimming module 60 is a first dimming instruction, wherein the first dimming instruction can be a 0-10V analog dimming signal, a 0-100% PWM signal or a resistance dimming signal. The internal unit 62 of the dimming module 60 is used to convert the first dimming instruction into a second dimming instruction that can be received by the processing unit 41, and is configured with a voltage conversion unit 621, a signal processing unit 622 and an isolation unit 623. Among them, the voltage conversion unit 621 is used to convert the first voltage vbus in the main circuit into the execution voltage required by the internal unit of the dimming module 60; the signal processing unit 622 is used to convert the received first dimming instruction into a first dimming signal that can be recognized by the isolation unit 623; the isolation unit 623 has a first isolation component 623a and a second isolation component 623b, and the two isolation components are electrically isolated.
[0047] There is a switch device Q between the dimming module 60 and the processing unit 41. The first end (trigger end) of the switch device Q is coupled to the pin 612, that is, coupled to the second isolation component 623b; the second end of the switch device Q is coupled to the pin 411 of the processing unit 41 to obtain the second signal instruction; the third end of the switch device Q is coupled to the second reference ground GND2.
[0048] One end of the signal processing unit 622 is coupled to pin 613 to receive a first dimming instruction, and the other end is coupled to the first isolation component 623a to output a first dimming signal to the first isolation component 623a. The first isolation component 623a is further coupled to the first reference ground GND1 through pin 614, or the first isolation component 623a is directly electrically connected to the first reference ground GND1. This loop can be referred to as a first loop. The input end of the voltage conversion unit 621 is coupled to pin 611 to receive a first voltage vbus, and the output end is coupled to the second isolation component 623b to provide an execution voltage to the second isolation component 623b. The second isolation component 623b is coupled to pin 612. This loop can be referred to as a second loop. The first reference ground GND1 is electrically isolated (independent) from the second reference ground GND2, or the first loop is electrically isolated (independent) from the second loop. Among them, the first isolation component 623a and the second isolation component 623b can refer to Figure 3-5 .
[0049] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.
Claims
1. A driving circuit, suitable for driving an LED load, characterized in that: The driving circuit comprises: A rectifier module, used for receiving an external power signal and rectifying it to generate a rectified signal; A filtering module, electrically connected to the rectifying module, for receiving the rectified signal and filtering the signal to generate a filtered signal; a control module, electrically connected to the filter module, for adjusting and outputting a driving signal to the LED load; and an isolated dimming module, coupled to the control module, for receiving a first dimming instruction through a first pin, and transmitting a second dimming instruction associated with the first dimming instruction to the control module through a second pin, The control module adjusts the driving signal according to the second dimming instruction, so that the LED load adjusts the light brightness in response to the second dimming instruction. Wherein, the isolated dimming module comprises: a first loop coupled to the first pin, for receiving and processing the first dimming instruction, wherein the first loop is coupled to a first ground terminal; and A second loop is coupled to the second pin and is used to generate the second dimming instruction in response to the first dimming instruction, wherein the second loop is coupled to a second ground terminal. The first ground terminal and the second ground terminal are electrically independent.
2. The driving circuit according to claim 1, characterized in that: The first circuit comprises: a signal processing unit having an input end and an output end, the signal processing unit being used to convert a first dimming instruction received from the input end into a first dimming signal, and output the first dimming signal from the output end; and A first isolation component, one end of the first isolation component is coupled to the output end of the signal processing unit to receive the first dimming signal and form a second dimming signal, and the other end of the first isolation component is coupled to the first ground end through the third pin of the isolated dimming module.
3. The driving circuit according to claim 2, characterized in that: The second circuit comprises: A voltage conversion unit, whose input end is coupled to the second pin, for converting the first voltage into an execution voltage required inside the isolated dimming module; A second isolation component, one end of which is coupled to the voltage conversion unit, and is used to synchronously receive the first dimming signal of the first isolation component to form a second dimming signal; A switch device, wherein the other end of the second isolation component is coupled to the first end of the switch device, and the second end of the second isolation component is coupled to the voltage conversion unit; a resistor, one end of which is coupled to the third end of the switch device, and the other end of which is coupled to the second ground end, Wherein, the third end of the switch device is electrically connected to the fourth pin of the isolated dimming module.
4. The driving circuit according to claim 2, characterized in that: The second circuit comprises: A voltage conversion unit, whose input end is coupled to the second pin, for converting the first voltage into an execution voltage required inside the isolated dimming module; The second isolation component has one end coupled to the voltage conversion unit for synchronously receiving the dimming signal of the first isolation component, and the other end coupled to the fourth pin of the isolated dimming module.
5. The driving circuit according to claim 4, characterized in that: The fourth pin is coupled to the control module through a switch device, wherein a first end of the switch device is coupled to the fourth pin to receive a second dimming instruction; a second end is coupled to a communication pin of the control module; and a third end is coupled to the second ground end.
6. The driving circuit according to claim 1, characterized in that: The first dimming instruction includes: a 0-100% PWM signal, a resistance dimming signal and a 0-10V analog dimming signal.
7. The driving circuit according to claim 1, characterized in that: The second dimming instruction is a PWM dimming signal.
8. The driving circuit according to any one of claims 3 or 5, characterized in that: The first isolation component includes a first inductor, and the second isolation component includes a second inductor, wherein the first inductor is coupled to the signal processing unit and the first ground terminal to obtain the first dimming signal; one end of the second inductor is coupled to the voltage conversion unit, and the other end is coupled to the second ground terminal through the switching device.
9. The driving circuit according to any one of claims 3 or 5, characterized in that: The first isolation component includes a first relay, and the second isolation component includes a second relay, wherein the first relay is coupled to the signal processing unit to obtain the first dimming signal; One end of the second relay is coupled to the voltage conversion unit to obtain the execution voltage, and the other end of the second relay is coupled to the second ground terminal through the switch device.
10. The driving circuit according to any one of claims 3 or 5, characterized in that: The first isolation component includes a first light emitting diode, and the second isolation component includes a second light emitting diode, wherein the first light emitting diode is coupled to the signal processing unit to obtain the first dimming signal; One end of the second light emitting diode is coupled to the voltage conversion unit to obtain the execution voltage, and the other end of the second light emitting diode is coupled to the second ground terminal through the switch device.
11. The driving circuit according to any one of claims 3 or 5, characterized in that: The first isolation component and the second isolation component constitute an isolation unit, the dimming signal of the first isolation component is synchronized with the second isolation component, and the switch device is triggered to transmit the second dimming instruction to the control module.
12. The driving circuit according to claim 1, wherein: The isolated dimming module is a chip.