LED driving circuit and lighting device

Abstract

The embodiment of the present application provides a kind of LED drive circuit and lighting device, belong to LED lighting technical field.The circuit includes: rectification module, constant power control module, ripple elimination module, LED module and current regulating module.Rectification module is converted into pulsating direct current signal from alternating current signal, and the first control unit of constant power control module is used to generate reference current signal according to the resistance value of first resistance regulating unit.Ripple elimination module is used to filter reference current signal, and obtain driving current signal.LED module is connected with first resistance regulating unit and ripple elimination module respectively, to produce light signal.Current regulating module is connected with rectification module, first control unit and ripple elimination module respectively, for adjusting the phase of pulsating direct current signal, to reduce the phase difference between voltage signal and pulsating direct current signal.The power factor of the present application can improve LED drive circuit.

Description

Technical Field

[0001] This application relates to the field of LED lighting technology, and in particular to an LED driver circuit and lighting device. Background Technology

[0002] Currently, LED lighting technology typically consists of a full-voltage input integrated circuit and a frequency suppression circuit. The pre-amplifier input circuit provides AC input across the full voltage range of the mains power (typically 100VAC to 260VAC). However, due to the need for operation over a wide voltage range, these circuits often employ switching power supplies to achieve voltage stabilization. The combination of switching power supplies and dimming circuits can lead to significant harmonic distortion, resulting in a low power factor. Therefore, improving the power factor of LED driver circuits has become a pressing technical problem. Utility Model Content

[0003] The main objective of this application is to provide an LED driving circuit and lighting device, which aims to improve the power factor of the LED driving circuit.

[0004] To achieve the above objectives, a first aspect of this application provides an LED driving circuit, the LED driving circuit comprising: A rectifier module is connected to an AC power supply and is used to convert the AC current signal of the AC power supply into a pulsating DC current signal. A constant power control module, comprising a first resistor adjustment unit and a first control unit, wherein the first control unit is connected to the rectifier module, the first resistor adjustment unit is connected to the first control unit, and the first control unit is used to convert the pulsating DC current signal into a reference current signal according to the resistance value corresponding to the first resistor adjustment unit. A ripple elimination module is connected to the first resistor adjustment unit. The ripple elimination module is used to filter the reference current signal to obtain a drive current signal. The LED module is connected to the first resistor adjustment unit and the ripple elimination module respectively, and is used to generate a light signal according to the drive current signal; A current regulation module is connected to the rectifier module, the first control unit and the ripple elimination module respectively. The current regulation module is used to adjust the phase of the pulsating DC current signal according to the voltage signal corresponding to the pulsating DC current signal and the drive current signal, so as to reduce the phase difference between the voltage signal and the pulsating DC current signal.

[0005] In some embodiments, the current regulation module includes a second control unit and a second resistance regulation unit. The second control unit includes a discharge current control terminal, a power supply terminal, and a current detection terminal. The rectifier module is connected to the discharge current control terminal through the second resistance regulation unit. The second control unit is used to output a discharge current according to the resistance value corresponding to the second resistance regulation unit. The rectifier module is also connected to the power supply terminal to acquire the voltage signal. The current detection terminal is connected to the ripple elimination module to acquire the drive current signal.

[0006] In some embodiments, the discharge current control terminal includes a first setting pin and a second setting pin, and the second resistor adjustment unit includes a first resistor, a second resistor, a third resistor, a first switching transistor, and a second switching transistor. The gate of the first switching transistor is connected to the rectifier module, the drain of the first switching transistor is connected to the gate of the second switching transistor, the drain of the second switching transistor is connected to the first setting pin through the first resistor, the first end of the second resistor is connected to the source of the second switching transistor, the second setting pin, and the first end of the third resistor, respectively, and the source of the first switching transistor, the second end of the second resistor, and the second end of the third resistor are grounded.

[0007] In some embodiments, the ripple elimination module includes a third control unit, a first capacitor, a first diode, and a fourth resistor. The first terminal of the LED module is connected to the first resistor adjustment unit, the first terminal of the first capacitor, and the first terminal of the fourth resistor of the constant power control module, respectively. The second terminal of the LED module is connected to the first terminal of the third control unit. The second terminals of the first capacitor, the fourth resistor, and the third control unit are connected to the anode of the first diode, respectively. The cathode of the first diode is connected to the current adjustment module.

[0008] In some embodiments, the constant power control module further includes a second capacitor, a second diode, and a third diode. The first control unit includes a voltage sampling pin, a first constant current output pin, and a second constant current output pin. The first end of the second capacitor is connected to the voltage sampling pin and the first constant current output pin, respectively. The second end of the second capacitor is connected to the positive terminal of the second diode and the negative terminal of the third diode, respectively. The positive terminal of the third diode is connected to the positive terminal of the first diode. The first control unit is used to control the operating state of the first constant current output pin and the second constant current output pin through the voltage value obtained by the voltage sampling pin. The second capacitor is used for filtering, and the third diode is used to provide freewheeling current to the second capacitor.

[0009] In some embodiments, the first control unit further includes a third setting pin and a fourth setting pin, and the first resistor adjustment unit includes a fifth resistor and a sixth resistor. The first end of the fifth resistor is connected to the third setting pin, the first end of the sixth resistor is connected to the fourth setting pin, and the second ends of the fifth resistor and the sixth resistor are respectively connected to the first end of the LED module.

[0010] In some embodiments, the rectifier module includes an overcurrent protection unit, a varistor unit, and a rectifier diode bridge unit. The first terminal of the overcurrent protection unit is connected to the live wire of the AC power supply. The second terminal of the overcurrent protection unit is connected to the first terminal of the varistor unit and the first terminal of the rectifier diode bridge unit, respectively. The second terminals of the varistor unit and the rectifier diode bridge unit are connected to the neutral wire of the AC power supply. The third terminal of the rectifier diode bridge unit is connected to the constant power control module and the current regulation module, respectively.

[0011] In some embodiments, the LED driving circuit further includes a silicon controlled rectifier (SCR) dimmer, which is disposed between the rectifier module and the AC power supply.

[0012] In some embodiments, the LED module includes a preset number of light-emitting diodes connected in series, wherein the preset number is greater than or equal to 1.

[0013] The LED driver circuit proposed in this application converts the AC current signal from the AC power supply into a pulsating DC current signal through a rectifier module. Then, the pulsating DC current signal is converted into a reference current signal through the first resistor adjustment unit and the first control unit in the constant power control module. A ripple elimination module filters the reference current signal to obtain a stable drive current signal, thereby driving the LED module to generate a stable light signal. Simultaneously, the current adjustment module adjusts the phase of the pulsating DC current signal according to the voltage signal and drive current signal corresponding to the pulsating DC current signal, effectively reducing the phase difference between the voltage signal and the pulsating DC current signal, reducing harmonic distortion, and improving the power factor. This solves the problem of low power factor in LED driver circuits and significantly improves the overall efficiency and stability of the circuit. This embodiment can simultaneously support SCR dimming, high power factor, and flicker elimination. This embodiment integrates three specific functions (full-voltage linear constant power control circuit, linear constant current SCR dimming processing and discharge current control circuit, and flicker elimination circuit) into a single-stage power conversion circuit, while traditional solutions require two or more stages to achieve all the aforementioned functions. This embodiment optimizes circuit space and economic costs.

[0014] To achieve the above objectives, a second aspect of the present application provides a lighting device, which includes an LED driving circuit as described in the first aspect.

[0015] The lighting device proposed in this application, by using the LED driving circuit provided in the foregoing embodiments, can adapt to different grid voltages. Due to the high power factor of the LED driving circuit, it can achieve energy saving and high efficiency, and reduce grid losses. Attached Figure Description

[0016] Figure 1 This is an optional module diagram of the LED driving circuit provided in the embodiments of this application; Figure 2 This is another optional module diagram of the LED driving circuit provided in the embodiments of this application; Figure 3 This is a circuit structure diagram of the LED driving circuit according to an embodiment of this application.

[0017] Reference numerals: rectifier module 100; AC power supply 200; constant power control module 300; first resistance adjustment unit 310; first control unit 320; ripple elimination module 400; LED module 500; current adjustment module 600; second control unit 610; second resistance adjustment unit 620. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0021] Currently, LED lighting technology typically consists of a full-voltage input integrated circuit and a frequency suppression circuit. The pre-amplifier input circuit provides AC input across the full voltage range of the mains power (typically 100VAC to 260VAC). However, due to the need for operation over a wide voltage range, these circuits often employ switching power supplies to achieve voltage stabilization. The combination of switching power supplies and dimming circuits can lead to significant harmonic distortion, resulting in a low power factor. Therefore, improving the power factor of LED driver circuits has become a pressing technical problem.

[0022] Based on this, embodiments of this application provide an LED driving circuit and a lighting device, which aim to improve the power factor of the LED driving circuit.

[0023] The LED driving circuit and lighting device provided in this application are specifically described through the following embodiments. First, the LED driving circuit in the embodiments of this application is described.

[0024] Figure 1 This is an optional module diagram of the LED driving circuit provided in the embodiments of this application. The LED driving circuit provided in the embodiments of this application includes: The rectifier module 100 is connected to the AC power supply 200 and is used to convert the AC current signal of the AC power supply 200 into a pulsating DC current signal.

[0025] The constant power control module 300 includes a first resistance adjustment unit 310 and a first control unit 320. The first control unit 320 is connected to the rectifier module 100, and the first resistance adjustment unit 310 is connected to the first control unit 320. The first control unit 320 is used to convert the pulsating DC current signal into a reference current signal according to the resistance value corresponding to the first resistance adjustment unit 310.

[0026] Ripple elimination module 400 is connected to the first resistor adjustment unit 310. Ripple elimination module 400 is used to filter the reference current signal to obtain the drive current signal.

[0027] LED module 500 is connected to the first resistor adjustment unit 310 and the ripple elimination module 400 respectively, and is used to generate light signals according to the drive current signal.

[0028] The current adjustment module 600 is connected to the rectifier module 100, the first control unit 320 and the ripple elimination module 400 respectively. The current adjustment module 600 is used to adjust the phase of the pulsating DC current signal according to the voltage signal and the drive current signal corresponding to the pulsating DC current signal, so as to reduce the phase difference between the voltage signal and the pulsating DC current signal.

[0029] The LED driver circuit provided in this application converts the AC current signal from the AC power supply into a pulsating DC current signal through a rectifier module. Then, the pulsating DC current signal is converted into a reference current signal through a first resistor adjustment unit and a first control unit in the constant power control module. A ripple cancellation module filters the reference current signal to obtain a stable drive current signal, thereby driving the LED module to generate a stable light signal. Simultaneously, the current adjustment module adjusts the phase of the pulsating DC current signal according to the voltage signal and drive current signal corresponding to the pulsating DC current signal, effectively reducing the phase difference between the voltage signal and the pulsating DC current signal, reducing harmonic distortion, and improving the power factor. This solves the problem of low power factor in LED driver circuits and significantly improves the overall efficiency and stability of the circuit.

[0030] In some embodiments, the LED driving circuit further includes a silicon controlled rectifier (SCR) dimmer, which is disposed between the rectifier module 100 and the AC power supply 200. The SCR dimmer can adjust the amount of current flowing through the light source by controlling the conduction time (i.e., trigger angle) of the current in each AC cycle, thereby controlling the brightness of the light source.

[0031] Please see Figure 2 , Figure 2 This is another optional module diagram of the LED driving circuit provided in this application embodiment. In some embodiments, the current adjustment module 600 includes a second control unit 610 and a second resistance adjustment unit 620. The second control unit 610 includes a discharge current control terminal, a power supply terminal, and a current detection terminal. The rectifier module 100 is connected to the discharge current control terminal through the second resistance adjustment unit 620. The second control unit 610 is used to output a discharge current according to the resistance value corresponding to the second resistance adjustment unit 620. It is understood that the discharge current output by the second control unit 610 can safely release the electrical energy stored in the circuit, preventing damage to electronic components, short circuits, or other safety hazards caused by excessive current or voltage, thereby ensuring the safety and stability of the circuit. The rectifier module 100 is also connected to the power supply terminal to obtain a voltage signal. The current detection terminal is connected to the ripple cancellation module 400 to obtain a drive current signal.

[0032] Specifically, please refer to Figure 3 , Figure 3 This is a circuit structure diagram of the LED driving circuit according to an embodiment of this application.

[0033] In some embodiments, the second control unit 610 may be a second control chip U2, whose power supply terminal is the VIN pin and current detection terminal is the OUT pin. The discharge current control terminal of the control chip includes a first setting pin REXT1 and a second setting pin REXT2. The second resistor adjustment unit 620 includes a first resistor R1, a second resistor R2, a third resistor R3, a first switch Q1, and a second switch Q2. Specifically, the gate of the first switch Q1 is connected to the rectifier module 100, and the drain of the first switch Q1 is connected to the gate of the second switch Q2. Further, the rectifier module 100 is connected to the gate of the first switch Q1 through resistor R13. The gate of the first switch Q1 is also connected to the first end of resistor R12, the second end of resistor R12 is grounded, and the source of the first switch Q1 is connected to the second end of resistor R12. The drain of the second switching transistor Q2 is connected to the first setting pin REXT1 via the first resistor R1. The first end of the second resistor R2 is connected to the source of the second switching transistor Q2, the second setting pin REXT2, and the first end of the third resistor R3. The source of the first switching transistor Q1, the second end of the second resistor R2, and the second end of the third resistor R3 are grounded. The gate of the second switching transistor Q2 is also connected to the first end of resistor R7 and the second end of resistor R14. The second end of resistor R7 is grounded, and the first end of resistor R14 is connected to the rectifier module 100.

[0034] In some embodiments, the second control unit 610 further includes NC1, NC2, TRAC, VDD, and GND pins. The TRAC pin is connected to the second terminal of resistor R8, the first terminal of resistor R9, and the first terminal of capacitor C1, respectively. The second terminal of resistor R8 is connected to the rectifier module 100, and the second terminals of resistor R9 and capacitor C1 are both grounded. The VIN pin is connected to the second terminals of resistors R10 and R11, respectively. The first terminals of resistors R10 and R11 are both connected to the second terminal of resistor R15, the first terminal of resistor R15 is connected to the cathode of diode D4, and the anode of diode D4 is connected to the rectifier module 100. The VDD pin is left floating, the GND pin is grounded, and the NC1, NC2, and OUT pins are grounded through the variable resistor RV2. It should be noted that when the input to the rectifier module 100 is high voltage, the first switch Q1 and the second switch Q2 are turned off, and the second control unit 610 disables the leakage function. When the input voltage of the rectifier module 100 is low, the first switch Q1 and the second switch Q2 are turned on, and the second control unit 610 activates the current leakage function. The magnitude of the leakage current is determined by the first resistor R1, the second resistor R2, and the third resistor R3. The second control chip U2 internally contains multiple switches and comparators, operating in a segmented automatic switching mode. It can obtain electrical signals through the VIN and OUT pins and sequentially turn on the internal switches according to the voltage corresponding to the comparison signal, ensuring that the input current waveform closely follows the AC voltage waveform, significantly reducing harmonic distortion and thus improving the power factor. The model of the second control chip U2 can be DX2318E.

[0035] In some embodiments, the ripple elimination module 400 includes a third control unit, a first capacitor E1, a first diode D1, and a fourth resistor R4. The first terminal of the LED module 500 is connected to the first resistor adjustment unit 310 of the constant power control module 300, the first terminal of the first capacitor E1, and the first terminal of the fourth resistor R4. The second terminal of the LED module 500 is connected to the first terminal of the third control unit. The second terminals of the first capacitor E1, the fourth resistor R4, and the third control unit are connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the current adjustment module 600. The circuit structure formed by the first capacitor E1 and the fourth resistor R4 can reduce ripple in the circuit, thereby reducing flicker when the LED illuminates. Specifically, the third control unit includes a third control chip U3 and a capacitor C2. The third control chip U3 has an OUT pin, a VCC pin, and a GND pin. The second terminal of the LED module 500 is connected to the OUT pin, the VCC pin is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is connected to the GND pin and the anode of the first diode D1. The cathode of the first diode D1 is connected to one end of the variable resistor RV2, and the NC1, NC2, and OUT pins of the second control chip U2, respectively. The first diode D1 prevents reverse current from flowing into the second control chip U2. The third control chip U3 can be a DX27641.

[0036] In some embodiments, the constant power control module 300 further includes a second capacitor E2, a second diode D2, and a third diode D3. The first control unit 320 may include a resistor R16 and a first control chip U1. The first control chip U1 is provided with a voltage sampling pin VT, a first constant current output pin OUT1, and a second constant current output pin OUT2. The first end of the second capacitor E2 is connected to the first end of the resistor R16 and the first constant current output pin, respectively. The second end of the resistor R16 is connected to the voltage sampling pin. The second end of the second capacitor E2 is connected to the anode of the second diode D2 and the cathode of the third diode D3, respectively. The anode of the third diode D3 is connected to the anode of the first diode D1. The first control unit 320 is used to control the operating state of the first constant current output pin and the second constant current output pin through the voltage value obtained by the voltage sampling pin. The second capacitor E2 is used for filtering, and the third diode D3 is used for freewheeling current to the second capacitor E2.

[0037] In some embodiments, the first control unit 320 further includes a third setting pin REXT3 and a fourth setting pin REXT4. The first resistor adjustment unit 310 includes a fifth resistor R5 and a sixth resistor R6. The first end of the fifth resistor R5 is connected to the third setting pin, the first end of the sixth resistor R6 is connected to the fourth setting pin, and the second ends of the fifth resistor R5 and the sixth resistor R6 are respectively connected to the first end of the LED module 500. Further, the first control chip U1 also has a GND pin, which is connected to the second end of the fifth resistor R5. The first control chip U1 may be an SM2098EH. The first end of the LED module 500 is connected to the positive terminal of the light-emitting diode, and the second end of the LED module 500 is connected to the negative terminal of the light-emitting diode.

[0038] In some embodiments, the rectifier module 100 includes an overcurrent protection unit FR1, a varistor unit RV1, and a rectifier diode bridge unit DB1. The first terminal of the overcurrent protection unit FR1 is connected to the live wire AC_L1 of the AC power supply 200. The second terminal of the overcurrent protection unit FR1 is connected to the first terminal of both the varistor unit RV1 and the rectifier diode bridge unit DB1. The second terminals of both the varistor unit RV1 and the rectifier diode bridge unit DB1 are connected to the neutral wire AC_N1 of the AC power supply 200. The third terminal of the rectifier diode bridge unit DB1 is connected to both the constant power control module 300 and the current regulation module 600. Further, the third terminal of the rectifier diode bridge unit DB1 is connected to the anode of diode D5, and the cathode of diode D5 is connected to the first terminal of the second capacitor E2. The rectifier diode bridge unit DB1 also has a fourth terminal, which is grounded. The overcurrent protection unit FR1 can be a fuse.

[0039] In some embodiments, the LED module 500 includes a preset number of light-emitting diodes connected in series, wherein the preset number is greater than or equal to 1. The preset number can be adjusted according to the actual needs of the scenario, and this embodiment does not strictly limit the specific value of the preset number. For example, in a commonly used household LED bulb, if 9V forward voltage LED beads are used, to approximate the supply voltage, 14 LED beads can be connected in series (14 × 9V = 126V).

[0040] Understandable, Figure 3 The provided embodiment can simultaneously support SCR dimming, high power factor, and flicker elimination. This embodiment integrates three specific functions (full-voltage linear constant power control circuit, linear constant current SCR dimming processing and discharge current control circuit, and flicker elimination circuit) into a single-stage power conversion circuit, while traditional solutions require two or more stages to achieve all the aforementioned functions. This embodiment optimizes circuit space and economic costs.

[0041] This application also provides a lighting device, including the LED driving circuit as described in the foregoing embodiments. The lighting device is applicable to various scenarios such as indoors, outdoors, and industrial settings. The specific implementation of this lighting device is essentially the same as the specific embodiments of the LED driving circuit described above, and will not be repeated here.

[0042] The lighting device provided in this application embodiment can adapt to different grid voltages by using the LED driving circuit provided in the foregoing embodiment. Due to the high power factor of the LED driving circuit, it can achieve energy saving and high efficiency and reduce grid loss.

[0043] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0044] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0045] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0046] Those skilled in the art will understand that all or some of the functional modules / units in the systems or devices disclosed in the methods above can be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0047] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0049] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0050] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. An LED driving circuit, characterized in that, The LED driving circuit includes: A rectifier module is connected to an AC power supply and is used to convert the AC current signal of the AC power supply into a pulsating DC current signal. A constant power control module, comprising a first resistor adjustment unit and a first control unit, wherein the first control unit is connected to the rectifier module, the first resistor adjustment unit is connected to the first control unit, and the first control unit is used to convert the pulsating DC current signal into a reference current signal according to the resistance value corresponding to the first resistor adjustment unit. A ripple elimination module is connected to the first resistor adjustment unit. The ripple elimination module is used to filter the reference current signal to obtain a drive current signal. The LED module is connected to the first resistor adjustment unit and the ripple elimination module respectively, and is used to generate a light signal according to the drive current signal; A current regulation module is connected to the rectifier module, the first control unit and the ripple elimination module respectively. The current regulation module is used to adjust the phase of the pulsating DC current signal according to the voltage signal corresponding to the pulsating DC current signal and the drive current signal, so as to reduce the phase difference between the voltage signal and the pulsating DC current signal.

2. The LED driving circuit according to claim 1, characterized in that, The current regulation module includes a second control unit and a second resistance regulation unit. The second control unit includes a discharge current control terminal, a power supply terminal, and a current detection terminal. The rectifier module is connected to the discharge current control terminal through the second resistance regulation unit. The second control unit is used to output a discharge current according to the resistance value corresponding to the second resistance regulation unit. The rectifier module is also connected to the power supply terminal to acquire the voltage signal. The current detection terminal is connected to the ripple elimination module to acquire the drive current signal.

3. The LED driving circuit according to claim 2, characterized in that, The discharge current control terminal includes a first setting pin and a second setting pin. The second resistor adjustment unit includes a first resistor, a second resistor, a third resistor, a first switching transistor, and a second switching transistor. The gate of the first switching transistor is connected to the rectifier module, the drain of the first switching transistor is connected to the gate of the second switching transistor, the drain of the second switching transistor is connected to the first setting pin through the first resistor, the first end of the second resistor is connected to the source of the second switching transistor, the second setting pin, and the first end of the third resistor, respectively, and the source of the first switching transistor, the second end of the second resistor, and the second end of the third resistor are grounded.

4. The LED driving circuit according to claim 1, characterized in that, The ripple elimination module includes a third control unit, a first capacitor, a first diode, and a fourth resistor. The first terminal of the LED module is connected to the first resistor adjustment unit, the first terminal of the first capacitor, and the first terminal of the fourth resistor of the constant power control module. The second terminal of the LED module is connected to the first terminal of the third control unit. The second terminals of the first capacitor, the fourth resistor, and the third control unit are connected to the positive terminal of the first diode. The negative terminal of the first diode is connected to the current adjustment module.

5. The LED driving circuit according to claim 4, characterized in that, The constant power control module further includes a second capacitor, a second diode, and a third diode. The first control unit includes a voltage sampling pin, a first constant current output pin, and a second constant current output pin. The first end of the second capacitor is connected to the voltage sampling pin and the first constant current output pin, respectively. The second end of the second capacitor is connected to the positive terminal of the second diode and the negative terminal of the third diode, respectively. The positive terminal of the third diode is connected to the positive terminal of the first diode. The first control unit is used to control the operating state of the first constant current output pin and the second constant current output pin through the voltage value obtained by the voltage sampling pin. The second capacitor is used for filtering, and the third diode is used to provide freewheeling current to the second capacitor.

6. The LED driving circuit according to claim 5, characterized in that, The first control unit further includes a third setting pin and a fourth setting pin. The first resistor adjustment unit includes a fifth resistor and a sixth resistor. The first end of the fifth resistor is connected to the third setting pin, the first end of the sixth resistor is connected to the fourth setting pin, and the second ends of the fifth resistor and the sixth resistor are respectively connected to the first end of the LED module.

7. The LED driving circuit according to any one of claims 1 to 6, characterized in that, The rectifier module includes an overcurrent protection unit, a varistor unit, and a rectifier diode bridge unit. The first terminal of the overcurrent protection unit is connected to the live wire of the AC power supply. The second terminal of the overcurrent protection unit is connected to the first terminal of the varistor unit and the first terminal of the rectifier diode bridge unit. The second terminals of the varistor unit and the rectifier diode bridge unit are connected to the neutral wire of the AC power supply. The third terminal of the rectifier diode bridge unit is connected to the constant power control module and the current regulation module.

8. The LED driving circuit according to any one of claims 1 to 6, characterized in that, The LED driving circuit also includes a silicon controlled rectifier (SCR) dimmer, which is disposed between the rectifier module and the AC power supply.

9. The LED driving circuit according to any one of claims 1 to 6, characterized in that, The LED module includes a preset number of light-emitting diodes connected in series, wherein the preset number is greater than or equal to 1.

10. A lighting device, characterized in that, The lighting device includes an LED driving circuit as described in any one of claims 1 to 9.

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