A high-efficiency conversion circuit for high-frequency resonant LED driver power supply
By optimizing the design of the high-frequency resonant LED driver power supply circuit, the problems of low integration and high loss in traditional power conversion circuits have been solved, realizing a highly integrated and intelligent high-power LED power supply, reducing switching losses and improving circuit reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional power conversion circuits have low integration, a large number of magnetic components, insufficient reliability, and high losses due to the control methods of switching transistors and inductors.
A high-frequency resonant LED driver power supply circuit is adopted, including a PFC relay circuit, a MOSFET driver circuit, a constant current module circuit, a voltage feedback circuit, and a current limiting protection circuit. By optimizing the circuit design and component selection, heat loss is reduced and integration is improved.
This high-power LED power supply achieves high integration and high intelligence, reduces switching losses, and improves the power factor and reliability of the circuit.
Smart Images
Figure CN224290118U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power conversion circuit technology, specifically a high-efficiency conversion circuit for high-frequency resonant LED driver power. Background Technology
[0002] With the development of technology, people have increasingly higher requirements for lighting quality. Lighting accounts for about 25% of total electricity consumption. As a new era of lighting, light-emitting diodes (LEDs) have great development potential. LEDs have the advantages of high brightness, low power consumption, and long lifespan. In special lighting fields, such as industrial photocuring, LEDs have solved the problem of unsatisfactory curing effects caused by the complete incompatibility of photoinitiators in existing UV inks. As a new type of green lighting technology, LEDs require a dedicated power supply. The main function of an LED driver is to convert 220V AC power into DC voltage and current suitable for LEDs, usually achieved through a switching converter circuit. LED driver circuits can be divided into two types: non-isolated switching drivers and isolated switching drivers. In a non-isolated switching driver, the input circuit and the output load circuit share the same current path when the circuit is working. In contrast, an isolated switching driver uses the mutual inductance generated by the magnetic core in the isolation transformer to achieve energy transfer, thereby avoiding the losses and interference caused by the input current and output load being in the same circuit.
[0003] However, traditional power conversion circuits have the following drawbacks:
[0004] Traditional power conversion circuits employ modular design but have low integration, numerous magnetic components, and insufficient reliability. Furthermore, the control methods for switching transistors and inductors result in significant losses. Utility Model Content
[0005] The purpose of this invention is to provide a high-efficiency conversion circuit for high-frequency resonant LED driver power supply, in order to solve the problems mentioned in the background art, such as the low integration of traditional power conversion circuits with modular design, numerous magnetic components, insufficient reliability, and high losses in the control methods of switching transistors and inductors.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-frequency resonant LED driver power supply high-efficiency conversion circuit, including a power conversion circuit, wherein the power conversion circuit includes a PFC relay circuit, a MOSFET driver circuit, a constant current module circuit, a voltage feedback circuit, and a current limiting protection circuit, wherein the PFC relay circuit, the MOSFET driver circuit, the voltage feedback circuit, and the current limiting protection circuit are all electrically connected to the constant current module circuit.
[0007] Preferably, the PFC relay circuit includes diode D1, diode D2, switch K1, thermistor RT1, resistor R128, resistor R127, diode D105, capacitor C100, resistor R125, capacitor C115, transistor Q104, and relay KTN222AS. One end of relay KTN222AS is connected to one end of diode D105 and one end of capacitor C100, respectively. The other end of relay KTN222AS is connected to one end of resistor R128, one end of resistor R127, the other end of diode D105, and capacitor C100, respectively. The other end of the circuit is connected to the capacitor C100. One end of the capacitor C100 is connected to one end of the transistor Q104. The other end of the transistor Q104 is connected to one end of the resistor R125 and one end of the capacitor C115. Pin 1 of the switch K1 is connected to one end of the thermistor RT1, one end of the diode D1, and one end of the diode D2. Pin 2 of the switch K1 is connected to the other end of the thermistor RT1. As an surge protector, the NTC thermistor has high power consumption, which can lead to temperature increases. Surrounding components may also be affected by this temperature increase, causing thermal damage or reducing their lifespan. To avoid this, the NTC thermistor can be short-circuited using a relay after the power supply circuit has stabilized. This will reduce the power consumption and temperature of the NTC thermistor to normal levels, preventing damage to surrounding components due to excessive temperature.
[0008] Preferably, the MOSFET driving circuit includes resistors R129 and R136, transistor Q101, resistors R132, R133, and R134, diode D103, MOSFET Q1, transistor Q100, and capacitor C113. One pin of transistor Q100 is connected to one end of capacitor C113. Pin 2 of transistor Q100 is connected to one end of resistor R129 and one end of resistor R136. Pin 3 of transistor Q100 is connected to one end of resistor R132 and one pin of transistor Q101. Pin 2 of transistor Q101 is connected to the other end of resistor R136. The other end of resistor R132 is connected to one end of diode D103 and one end of resistor R133. The other ends of diode D103, resistor R133, and resistor C113 are connected to... One end of R134 is connected to one end of MOSFET Q1. The turn-on time of the MOSFET is determined by the driver circuit, and the voltage on the DRV port is determined by the control chip. When a voltage signal arrives at the DRV port, the current flows through R129 and then through Q100 to charge the Cgs of the MOSFET. When the DRV port is high, Q100 operates in the amplification region. If the resistance values of R132 and R133 are chosen to be relatively large, the charging current to the Cgs of the MOSFET will decrease, the voltage rise rate of Cgs will be slower, and the turn-on speed of the MOSFET will be affected. When the DRV port is low, Q101 conducts, the Cgs capacitor discharges, and the diode is connected in parallel with resistor R133. The turn-on and turn-off speeds of the MOSFET become faster, the time taken is shorter, and the crossover loss is reduced. Changing the resistance value can control the turn-on and turn-off speeds of the MOSFET.
[0009] Preferably, the constant current module circuit includes current transformers P5 and P7, diode D16, capacitors C4 and C5, resistors R47, R46, R49, and R45, capacitors C41, C42, and C40, diode D15, inductor L4, resistor R50, capacitors C6, C7, and C8, current transformers P6 and P8, capacitor C43, resistor R48, and integrated circuit IC3. Pin 1 of integrated circuit IC3 is connected to one end of capacitor C40, and the other end of capacitor C40 is connected to diode D16. One end of diode D15 is connected; pin 2 of integrated circuit IC3 is connected to pin 1 of current transformer P5; pin 3 of integrated circuit IC3 is connected to one end of resistor R46 and one end of resistor R47; the other end of resistor R47 is connected to one end of capacitor C4 and one end of capacitor C5; pin 5 of integrated circuit IC3 is connected to one end of resistor R49; pin 8 of integrated circuit IC3 is connected to one end of resistor R45 and one end of capacitor C42; the other end of resistor R45 is connected to one end of capacitor C41. Connecting pin 7 of integrated circuit IC3, one end of resistor R50 is connected to one end of resistor R48, one end of capacitor C6, one end of capacitor C7, pin 1 of current transformer P6, and one end of capacitor C8. Pin 10 of integrated circuit IC3 is connected to one end of inductor L4. The other ends of inductor L4, capacitor C6, capacitor C7, and capacitor C8 are all connected to pin 2 of current transformer P6. Pin 9 of integrated circuit IC3 is connected to one end of capacitor C43 and one end of current transformer P6. Pin 2 of transformer P8 is connected, and the other ends of diode D15, resistor R46, capacitor C4, capacitor C5, pin 2 of transformer P5, resistor R49, pin 6 of integrated circuit IC3, capacitor C42, capacitor C41, resistor R48, capacitor C43, and pin 1 of transformer P8 are all grounded. The TPS92510 chip is selected as the control core of the constant current drive module, with an input voltage range of 3.5V to 60V and an output current of 1.5A.
[0010] Preferably, the voltage feedback circuit includes resistors R224, R225, R226, R235, R236, R250, capacitors C206 and C212, resistors R237, C205, C204, R260, C216, R239, and power amplifier U202A. Pin 1 of power amplifier U202A is connected to one end of capacitor C205, one end of capacitor C204, and resistor R202A, respectively. One end of capacitor C205 is connected to one end of resistor R237. Pins 2 of amplifier U202A are connected to the other end of resistor R237, one end of resistor R236, resistor R235, resistor R226, and one end of capacitor C216, respectively. Pin 3 of amplifier U202A is connected to one end of capacitor C206 and one end of resistor R250, respectively. Pin 8 of amplifier U202A is connected to one end of capacitor C212. The other end of resistor R226 is connected to one end of resistor R225, the other end of resistor R225 is connected to one end of resistor R224, and the other end of capacitor C216 is connected to one end of resistor R260. The output current of the LLC switching power supply is generally 12.5A, and the current limiting threshold is 16A. At this time, only the voltage feedback circuit works, and the current limiting protection circuit does not work. When the output current increases from 12.5A, through the cooperation of the feedback circuit and the control chip, the operating frequency of the LLC switching power supply decreases. When the output current is 16A, assuming the output load is 2.5, the output voltage is 40V. The output voltage is transmitted to the inverting input of operational amplifier U202A through loop 1. The output voltage of operational amplifier U202A is too high, causing the diode of the voltage feedback circuit to be cut off, and the voltage feedback circuit is in a non-working state. In summary, when the output current reaches the current limiting threshold, the voltage feedback circuit will be shielded, and the abnormal operation of the feedback circuit will be avoided when the output is short-circuited.
[0011] Preferably, the current limiting protection circuit includes resistor R240, operational amplifier UC202A, capacitor C207, resistor R249, capacitor C208, capacitor C209, resistor R254, resistor R253, resistor R252, resistor R251, and TH2. Pin 7 of operational amplifier UC202A is connected to one end of capacitor C207, one end of capacitor C208, and one end of resistor R240. Pin 5 of operational amplifier UC202A is connected to one end of sprocket C209, one end of resistor R254, and one end of resistor R253. The other end of resistor R253 is connected to one end of resistor R252. The other end of resistor R252 is connected to one end of resistor R251. The outer side of resistor R251 is connected in parallel with TH2. Pins 6 of operational amplifier UC202A are connected to one end of resistor R259 and one end of resistor R23, respectively. The other end of capacitor C207 is connected to the other end of resistor R249. When the voltage feedback circuit is working normally, the bias current flowing into the operational amplifier is about 0.5μA. The current of the voltage divider resistor must be much greater than 0.5μA, otherwise the operational amplifier bias current will have a significant impact on the voltage divider resistor. Based on the output voltage and the voltage divider resistor current, the lower voltage divider resistor value is selected as 5.1kΩ and the upper voltage divider resistor value is selected as 92.8kΩ.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. LLC resonant converter is selected as LED driver power supply. A large number of electrolytic capacitors are used in the power correction circuit and LLC resonant circuit to eliminate noise in the input and output signals. In practical applications, this avoids the limitation of environmental factors and meets the requirements of modern industrial construction, as well as the demand for highly integrated and intelligent high-power LED power supplies.
[0014] 2. The LLC resonant converter parameters enable soft start, thereby reducing switching losses. The PFC relay module corrects the input current. The selection of PFC output capacitor and MOSFET parameters is analyzed to improve the circuit power factor. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the architecture of this utility model;
[0016] Figure 2 This is a circuit diagram of the PFC relay circuit of this utility model;
[0017] Figure 3 This is a circuit diagram of the MOS transistor driving circuit of this utility model;
[0018] Figure 4 This is a circuit diagram of the constant current module circuit of this utility model;
[0019] Figure 5 This is a circuit diagram of the voltage feedback circuit of this utility model;
[0020] Figure 6 This is a circuit diagram of the current limiting protection circuit of this utility model. Detailed Implementation
[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0022] Please see Figure 1-6 This utility model provides a high-efficiency conversion circuit for high-frequency resonant LED driver power supply, including a power conversion circuit. The power conversion circuit includes a PFC relay circuit, a MOSFET driver circuit, a constant current module circuit, a voltage feedback circuit, and a current limiting protection circuit. The PFC relay circuit, the MOSFET driver circuit, the voltage feedback circuit, and the current limiting protection circuit are all electrically connected to the constant current module circuit.
[0023] The PFC relay circuit includes diode D1, diode D2, switch K1, thermistor RT1, resistor R128, resistor R127, diode D105, capacitor C100, resistor R125, capacitor C115, transistor Q104, and relay KTN222AS. One end of relay KTN222AS is connected to one end of diode D105 and one end of capacitor C100, respectively. The other end of relay KTN222AS is connected to one end of resistor R128, one end of resistor R127, the other end of diode D105, and capacitor C100, respectively. The other end of the circuit is connected to the capacitor C100, which is connected to one end of the transistor Q104. The other end of the transistor Q104 is connected to one end of the resistor R125 and one end of the capacitor C115. Pin 1 of the switch K1 is connected to one end of the thermistor RT1, one end of the diode D1, and one end of the diode D2. Pin 2 of the switch K1 is connected to the other end of the thermistor RT1. As an surge protector, the NTC thermistor has high power consumption, which can lead to temperature increases. Surrounding components may also be affected by this temperature increase, causing thermal damage or reducing their lifespan. To avoid this, the NTC thermistor can be short-circuited using a relay after the power supply circuit has stabilized. This will reduce the power consumption and temperature of the NTC thermistor to normal levels, preventing damage to surrounding components due to excessive heat.
[0024] The MOSFET driver circuit includes resistors R129 and R136, transistor Q101, resistors R132, R133, and R134, diode D103, MOSFET Q1, transistor Q100, and capacitor C113. Pin 1 of transistor Q100 is connected to one end of capacitor C113. Pin 2 of transistor Q100 is connected to one end of resistor R129 and one end of resistor R136. Pin 3 of transistor Q100 is connected to one end of resistor R132 and one end of transistor Q101. Pin 2 of transistor Q101 is connected to the other end of resistor R136. The other end of resistor R132 is connected to one end of diode D103 and one end of resistor R133. The other ends of diode D103, resistor R133, and resistor R134 are all connected to... One end of MOSFET Q1 is connected. The turn-on time of the MOSFET is determined by the driver circuit, and the voltage on the DRV port is determined by the control chip. When a voltage signal arrives at the DRV port, the current flows through R129 and then through Q100 to charge the Cgs of the MOSFET. When the DRV port is high, Q100 operates in the amplification region. If the resistance values of R132 and R133 are chosen to be relatively large, the charging current to the Cgs of the MOSFET will decrease, the voltage rise rate of Cgs will be slower, and the turn-on speed of the MOSFET will be affected. When the DRV port is low, Q101 conducts, the Cgs capacitor discharges, and the diode is connected in parallel with the R133 resistor. The turn-on and turn-off speeds of the MOSFET become faster, the time taken is shorter, and the crossover loss is reduced. Changing the resistance value can control the turn-on and turn-off speeds of the MOSFET.
[0025] The constant current module circuit includes current transformers P5 and P7, diode D16, capacitors C4 and C5, resistors R47, R46, R49, and R45, capacitors C41, C42, and C40, diode D15, inductor L4, resistor R50, capacitors C6, C7, and C8, current transformers P6 and P8, capacitor C43, resistor R48, and integrated circuit IC3. Pin 1 of integrated circuit IC3 is connected to one end of capacitor C40, and the other end of capacitor C40 is connected to diode D15. One end of D15 is connected; pin 2 of integrated circuit IC3 is connected to pin 1 of current transformer P5; pin 3 of integrated circuit IC3 is connected to one end of resistor R46 and one end of resistor R47 respectively; the other end of resistor R47 is connected to one end of capacitor C4 and one end of capacitor C5 respectively; pin 5 of integrated circuit IC3 is connected to one end of resistor R49; pin 8 of integrated circuit IC3 is connected to one end of resistor R45 and one end of capacitor C42 respectively; the other end of resistor R45 is connected to one end of capacitor C41. Pin 7 of IC3 is connected to one end of resistor R50. The other end of resistor R50 is connected to one end of resistor R48, one end of capacitor C6, one end of capacitor C7, pin 1 of current transformer P6, and one end of capacitor C8. Pin 10 of IC3 is connected to one end of inductor L4. The other ends of inductor L4, capacitor C6, capacitor C7, and capacitor C8 are all connected to pin 2 of current transformer P6. Pin 9 of IC3 is connected to one end of capacitor C43 and pin 2 of current transformer P8. The pin connections are as follows: the other end of diode D15, the other end of resistor R46, the other end of capacitor C4, the other end of capacitor C5, pin 2 of current transformer P5, the other end of resistor R49, pin 6 of integrated circuit IC3, the other end of capacitor C42, the other end of capacitor C41, the other end of resistor R48, the other end of capacitor C43, and pin 1 of current transformer P8 are all grounded. The TPS92510 chip is selected as the control core of the constant current drive module, with an input voltage range of 3.5V to 60V and an output current of 1.5A.
[0026] The voltage feedback circuit includes resistors R224, R225, R226, R235, R236, and R250; capacitors C206 and C212; resistors R237, C205, and C204; resistors R260, C216, and R239; and power amplifier U202A. Pin 1 of power amplifier U202A is connected to one end of capacitor C205, one end of capacitor C204, and resistor R239. One end of the capacitor C205 is connected to one end of the resistor R237. Pins 2 of the power amplifier U202A are connected to the other end of resistor R237, one end of resistor R236, resistor R235, resistor R226, and one end of capacitor C216, respectively. Pin 3 of the power amplifier U202A is connected to one end of capacitor C206 and one end of resistor R250, respectively. Pin 8 of the power amplifier U202A is connected to one end of capacitor C212, and resistor R2... The other end of capacitor C26 is connected to one end of resistor R225, the other end of resistor R225 is connected to one end of resistor R224, and the other end of capacitor C216 is connected to one end of resistor R260. The output current of the LLC switching power supply is generally 12.5A, and the current limiting threshold is 16A. At this time, only the voltage feedback circuit works, and the current limiting protection circuit does not work. When the output current increases from 12.5A, through the cooperation of the feedback circuit and the control chip, the operating frequency of the LLC switching power supply decreases. When the output current is 16A, assuming the output load is 2.5, the output voltage is 40V. The output voltage is transmitted to the inverting input of op-amp U202A through loop 1. The output voltage of op-amp U202A is too high, causing the diode of the voltage feedback circuit to be cut off, and the voltage feedback circuit is in a non-working state. In summary, when the output current reaches the current limiting threshold, the voltage feedback circuit will be shielded, and the abnormal operation of the feedback circuit will be avoided when the output is short-circuited.
[0027] The current limiting protection circuit includes resistor R240, operational amplifier UC202A, capacitor C207, resistor R249, capacitor C208, capacitor C209, resistor R254, resistor R253, resistor R252, resistor R251, and TH2. Pin 7 of operational amplifier UC202A is connected to one end of capacitor C207, one end of capacitor C208, and one end of resistor R240. Pin 5 of operational amplifier UC202A is connected to one end of sprocket C209, one end of resistor R254, and one end of resistor R253. The other end of resistor R253 is connected to one end of resistor R252. Resistor R... The other end of 252 is connected to one end of resistor R251. The outer side of resistor R251 is connected in parallel with TH2. Pins 6 of op-amp UC202A are connected to one end of resistor R259 and one end of resistor R23 respectively. The other end of capacitor C207 is connected to the other end of resistor R249. When the voltage feedback circuit is working normally, the bias current flowing into the op-amp is about 0.5μA. The current of the voltage divider resistor must be much greater than 0.5μA, otherwise the op-amp bias current will have a significant impact on the voltage divider resistor. Based on the output voltage and the voltage divider resistor current, the lower voltage divider resistor value is selected as 5.1k and the upper voltage divider resistor value is 92.8k.
[0028] In this application embodiment, when using an NTC thermistor as a surge protector, its power consumption is very high, which can lead to a rise in temperature. This temperature increase may also affect surrounding devices, causing thermal damage or reducing their lifespan. To avoid this, the NTC thermistor can be short-circuited with a relay after the power supply circuit has stabilized. This reduces the power consumption and temperature of the NTC thermistor to normal levels, preventing damage to surrounding devices due to excessive temperature. The turn-on time of the MOSFET is determined by the drive circuit, and the voltage at the DRV port is determined by the control chip. When a voltage signal arrives at the DRV port, current flows through R129 and then through Q100 to charge the MOSFET's Cgs. When the DRV port is high, Q100 operates in the amplification region. If the resistance values of R132 and R133 are chosen to be relatively large, the charging current to the MOSFET's Cgs will decrease, the voltage rise rate of Cgs will slow down, and the turn-on speed of the MOSFET will be affected. When the DRV port is low, Q101 conducts, Cgs capacitor discharges, and the diode is connected in parallel with resistor R133. The turn-on and turn-off speeds of the MOSFET become faster, the time taken is shorter, and the crossover loss is reduced. Changing the resistor value can control the turn-on and turn-off speeds of the MOSFET. The TPS92510 chip is selected as the control core of the constant current drive module. Its input voltage range is 3.5V to 60V, and the output current is 1.5A. When the voltage feedback circuit is working normally, the bias current flowing into the op-amp is about 0.5μA. The voltage divider resistor current must be much greater than 0.5μA, otherwise the op-amp bias current will have a significant impact on the voltage divider resistor. Based on the output voltage and the voltage divider resistor current, the lower voltage divider resistor value is selected as 5.1kΩ, and the upper voltage divider resistor value is selected as 92.8kΩ.
[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A high-efficiency conversion circuit for a high-frequency resonant LED driver power supply, comprising a power conversion circuit, characterized in that: The power conversion circuit includes a PFC relay circuit, a MOSFET driver circuit, a constant current module circuit, a voltage feedback circuit, and a current limiting protection circuit. The PFC relay circuit, the MOSFET driver circuit, the voltage feedback circuit, and the current limiting protection circuit are all electrically connected to the constant current module circuit.
2. The high-efficiency conversion circuit for a high-frequency resonant LED driver power supply according to claim 1, characterized in that: The PFC relay circuit includes diode D1, diode D2, switch K1, thermistor RT1, resistor R128, resistor R127, diode D105, capacitor C100, resistor R125, capacitor C115, transistor Q104, and relay KTN222AS. One end of relay KTN222AS is connected to one end of diode D105 and one end of capacitor C100, respectively. The other end of relay KTN222AS is connected to resistor R128. One end of the switch K1 is connected to one end of the resistor R127, the other end of the diode D105, and the other end of the capacitor C100. One end of the capacitor C100 is connected to one end of the transistor Q104. The other end of the transistor Q104 is connected to one end of the resistor R125 and one end of the capacitor C115. One pin of the switch K1 is connected to one end of the thermistor RT1, one end of the diode D1, and one end of the diode D2. The other pin of the switch K1 is connected to the other end of the thermistor RT1.
3. The high-efficiency conversion circuit for a high-frequency resonant LED driver power supply according to claim 1, characterized in that: The MOSFET driving circuit includes resistors R129 and R136, transistor Q101, resistors R132, R133, and R134, diode D103, MOSFET Q1, transistor Q100, and capacitor C113. Pin 1 of transistor Q100 is connected to one end of capacitor C113. Pin 2 of transistor Q100 is connected to one end of resistor R129 and one end of resistor R136. Pin 3 of transistor Q100 is connected to one end of resistor R132 and one end of transistor Q101. Pin 2 of transistor Q101 is connected to the other end of resistor R136. The other end of resistor R132 is connected to one end of diode D103 and one end of resistor R133. The other ends of diode D103, resistor R133, and resistor R134 are all connected to one end of MOSFET Q1.
4. The high-efficiency conversion circuit for a high-frequency resonant LED driver power supply according to claim 1, characterized in that: The constant current module circuit includes current transformers P5 and P7, diode D16, capacitors C4 and C5, resistors R47, R46, R49, and R45, capacitors C41, C42, and C40, diode D15, inductor L4, resistor R50, capacitors C6, C7, and C8, current transformers P6 and P8, capacitor C43, resistor R48, and integrated circuit IC3. Pin 1 of integrated circuit IC3 is connected to one end of capacitor C40. The other end of capacitor C40 is connected to one end of diode D15. Pin 2 of integrated circuit IC3 is connected to pin 1 of current transformer P5. Pin 3 of integrated circuit IC3 is connected to one end of resistor R46 and one end of resistor R47. The other end of resistor R47 is connected to one end of capacitor C4 and one end of capacitor C5. Pin 5 of integrated circuit IC3 is connected to one end of resistor R49. Pin 8 of integrated circuit IC3 is connected to one end of resistor R45 and one end of capacitor C42. The connection is as follows: the other end of resistor R45 is connected to one end of capacitor C41; pin 7 of integrated circuit IC3 is connected to one end of resistor R50; the other end of resistor R50 is connected to one end of resistor R48, one end of capacitor C6, one end of capacitor C7, pin 1 of current transformer P6, and one end of capacitor C8; pin 10 of integrated circuit IC3 is connected to one end of inductor L4; and the other ends of inductor L4, capacitor C6, capacitor C7, and capacitor C8 are all connected to... Pin 2 of current transformer P6 is connected, and pin 9 of integrated circuit IC3 is connected to one end of capacitor C43 and pin 2 of current transformer P8 respectively. The other end of diode D15, the other end of resistor R46, the other end of capacitor C4, the other end of capacitor C5, pin 2 of current transformer P5, the other end of resistor R49, pin 6 of integrated circuit IC3, the other end of capacitor C42, the other end of capacitor C41, the other end of resistor R48, the other end of capacitor C43, and pin 1 of current transformer P8 are all grounded.
5. The high-efficiency conversion circuit for a high-frequency resonant LED driver power supply according to claim 1, characterized in that: The voltage feedback circuit includes resistors R224, R225, R226, R235, R236, and R250, capacitors C206 and C212, resistors R237, C205, C204, R260, C216, and R239, and power amplifier U202A. Pin 1 of power amplifier U202A is connected to one end of capacitor C205, one end of capacitor C204, and one end of resistor R239. The other end of capacitor C205 is connected to one end of resistor R237. Pin 2 of the amplifier U202A is connected to the other end of resistor R237, one end of resistor R236, resistor R235, resistor R226, and one end of capacitor C216, respectively. Pin 3 of the amplifier U202A is connected to one end of capacitor C206 and one end of resistor R250, respectively. Pin 8 of the amplifier U202A is connected to one end of capacitor C212. The other end of resistor R226 is connected to one end of resistor R225. The other end of resistor R225 is connected to one end of resistor R224. The other end of capacitor C216 is connected to one end of resistor R260.
6. The high-efficiency conversion circuit for a high-frequency resonant LED driver power supply according to claim 1, characterized in that: The current limiting protection circuit includes resistor R240, operational amplifier UC202A, capacitor C207, resistor R249, capacitor C208, capacitor C209, resistor R254, resistor R253, resistor R252, resistor R251, and TH2. Pin 7 of operational amplifier UC202A is connected to one end of capacitor C207, one end of capacitor C208, and one end of resistor R240, respectively. Pin 5 of operational amplifier UC202A is connected to sprocket C209. One end of the capacitor is connected to one end of resistor R254 and one end of resistor R253. The other end of resistor R253 is connected to one end of resistor R252. The other end of resistor R252 is connected to one end of resistor R251. The outer side of resistor R251 is connected in parallel with TH2. The 6 pins of the operational amplifier UC202A are connected to one end of resistor R259 and one end of resistor R23 respectively. The other end of capacitor C207 is connected to the other end of resistor R249.