Two-stage temperature control protection method and system for power factor correction circuit

Abstract

The invention discloses a two-stage temperature control protection method and system for a power factor correction circuit, and the method comprises the steps: a main controller collects the working temperature of a power device in real time through a temperature collection module at a fixed period, and carries out the processing, and obtains the current temperature of the power device; judging whether the current temperature of the power device exceeds a first temperature threshold value or not; if not, monitoring is continued, and any protection action is not started; if the current temperature of the power device exceeds the first temperature threshold value, a fan corresponding to the power device is started, and the rotating speed of the fan is adjusted according to the difference value between the current temperature of the power device and the first temperature threshold value; and monitoring the current temperature of the power device when the fan runs, and starting temperature closed-loop control to reduce the power consumption of the power device when the current temperature of the power device rises to exceed a second temperature threshold value. Temperature control protection is triggered through double thresholds, and fan speed regulation and duty ratio regulation of the increment PID controller are combined, so that the power factor correction circuit is protected.

Description

Technical Field

[0001] This invention relates to the technical field of circuit temperature control protection, and more specifically, to a two-stage temperature control protection method and system for power factor correction circuits. Background Technology

[0002] In switching power supplies, frequency converters, UPS, and new energy grid-connected equipment, power factor correction (PFC) circuits are widely used to improve the power quality of the grid side and reduce harmonic currents. The main switching transistor and boost diode in the PFC circuit generate significant conduction and switching losses under high-frequency PWM drive, especially under high input voltage and heavy load conditions, resulting in significant temperature rise.

[0003] Existing PFC modules typically employ passive cooling or fixed on / off fans for thermal management, directly shutting down the PFC function or limiting output power when the temperature becomes too high. However, this approach has the following problems: 1. The fan starts and stops frequently, resulting in high noise and a short lifespan; 2. The protection mechanism is a "hard cutoff," which causes a sudden drop in system performance and affects the stability of downstream power supply. 3. Lacking an active regulatory mechanism, it cannot effectively suppress the temperature rise in the early stages; 4. The heat dissipation and electronic control are disconnected, failing to achieve coordinated control of "heat source suppression + external heat dissipation".

[0004] Therefore, there is an urgent need for a graded temperature control strategy that integrates active heat dissipation and intelligent power regulation, suitable for high-reliability PFC systems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a two-stage temperature control protection system and method for power factor correction circuits, which solves the technical problems of traditional temperature control protection methods affecting system stability, disconnecting heat dissipation from electrical control, and lacking coordinated management.

[0006] The present invention adopts the following technical solution.

[0007] A two-stage temperature control protection method for power factor correction circuits, the method specifically includes the following steps: The main controller collects and processes the operating temperature of the power device in real time through the temperature acquisition module at fixed intervals to obtain the current temperature of the power device. Determine whether the current temperature of the power device exceeds the first temperature threshold T1; if it does not exceed it, continue monitoring and do not initiate any protection action. If the current temperature of the power device exceeds the first temperature threshold T1, start the fan corresponding to the power device and adjust the fan speed according to the difference between the current temperature of the power device and the first temperature threshold T1. The current temperature of the power device is monitored during fan operation. When the current temperature of the power device rises above the second temperature threshold T2, temperature closed-loop control is activated to reduce the power consumption of the power device. The second temperature threshold T2 is greater than the first temperature threshold T1.

[0008] Preferably, the main controller acquires and processes the operating temperature of the power devices in real time through the temperature acquisition module at fixed intervals, specifically including: The main controller collects the operating temperature of the power device in real time at fixed intervals through a temperature acquisition module installed on the heat sink substrate or inside the package of the power device. The raw temperature sample values ​​are filtered to eliminate noise interference, and the current temperature of the power device is obtained after processing.

[0009] Preferably, the power device includes a first switching transistor and a second switching transistor.

[0010] Preferably, the step of adjusting the fan speed based on the difference between the current temperature of the power device and the first temperature threshold T1 is as follows: The fan's duty cycle V is calculated based on the difference between the current temperature and the first temperature threshold T1, using the following formula: V = (Treal - T1) / (T2 - T1) Where Treal is the current temperature of the power device.

[0011] Preferably, the start-up temperature closed-loop control reduces the power consumption of the power devices, specifically including: The difference between the second temperature threshold T2 and the current temperature of the power device is used as the input of the incremental PID controller. The incremental PID controller is used to calculate the duty cycle adjustment, and the duty cycle adjustment is superimposed on the base duty cycle output at the previous moment in the main control loop to obtain the final output value.

[0012] Preferably, the step of using an incremental PID controller to calculate the duty cycle adjustment specifically includes: The output of the incremental PID controller is the sum of the current control quantity u(k) and the previous control quantity u(k). The difference Δu(k) is used as the duty cycle adjustment amount, and the calculation formula is as follows: Δu(k)=u(k) u(k 1)=Kp[e(k) e(k 1)]+Ki×e(k)+Kd[e(k) 2e(k 1)+e(k 2)] Where Kp, Ki, and Kd are the proportional, integral, and derivative gains of the PID controller, respectively; e(k) represents the difference between the actual and theoretical values ​​of the input duty cycle in the k-th control iteration; e(k 1) e(k) 2) These represent the differences between the actual and theoretical values ​​of the input duty cycle in the (k-1)th and (k-2)th control operations, respectively.

[0013] Preferably, the actual value of the input duty cycle is the duty cycle corresponding to the power device at the current temperature; The theoretical value of the input duty cycle is the duty cycle corresponding to the power device under the second temperature threshold T2.

[0014] Preferably, the method further includes: Continuously monitor the current temperature of the power devices in real time and adjust the temperature control protection mode accordingly: If the current temperature of the power device is less than or equal to the second temperature threshold T2 and the duration reaches the preset duration, the temperature closed-loop control will be exited. When the current temperature of the power device is lower than the first temperature threshold T1, the fan speed is gradually reduced until it is turned off.

[0015] This invention also proposes a two-stage temperature control protection system for power factor correction circuits, used to implement the two-stage temperature control protection method for power factor correction circuits, comprising: The temperature acquisition module is used to acquire the operating temperature of the power devices in real time at fixed intervals. The main controller is used to process the real-time acquired operating temperature of the power devices to obtain the current temperature of the power devices; The temperature comparison module is used to determine whether the current temperature of the power device exceeds the first temperature threshold T1 and the second temperature threshold T2. If the current temperature of the power device does not exceed the first temperature threshold T1, monitoring continues and no protection action is initiated. The second temperature threshold T2 is greater than the first temperature threshold T1. The fan adjustment module is used to start the fan corresponding to the power device when the current temperature of the power device exceeds the first temperature threshold T1, and adjust the fan speed according to the difference between the current temperature of the power device and the first temperature threshold T1. The controller adjustment module is used to activate temperature closed-loop control to reduce the power consumption of the power device when the current temperature of the power device rises above the second temperature threshold T2.

[0016] The present invention also proposes a computer-readable storage medium storing computer-readable instructions that can be executed by a processor to implement the described two-stage temperature control protection method for power factor correction circuits.

[0017] The beneficial effects of this invention are as follows: Compared with the prior art, by introducing a dual-temperature threshold graded protection mechanism, combined with fan speed regulation and PID duty cycle coordinated control, it effectively solves the technical problem of power devices in PFC circuits being easily damaged by overheating, and realizes intelligent temperature regulation without interrupting system operation; when the temperature exceeds the first threshold, the fan is started for active cooling, avoiding noise and losses caused by frequent start-stop; when the temperature rises further, the PWM duty cycle is dynamically reduced through a temperature feedback PID algorithm, suppressing power loss from the source, preventing thermal runaway, and significantly improving the thermal management efficiency and operational stability of the system; at the same time, the use of incremental PID control and hysteresis exit mechanism avoids control oscillation and response abrupt changes, extending the service life of power devices and cooling fans, making it particularly suitable for power electronic equipment with high power density and long-term high-load operation, and has good reliability, adaptability and engineering application value. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the two-stage temperature control protection system method for power factor correction circuits in this invention. Figure 2 This is a schematic diagram of the two-stage temperature control protection system used in the power factor correction circuit of this invention; Figure 3 This is a circuit diagram of the two-stage temperature control protection circuit used in the power factor correction circuit of this invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0020] Example 1 like Figure 1 As shown, this invention proposes a two-stage temperature control protection method for power factor correction circuits. This method is used to provide temperature control protection for power factor correction circuits, enabling timely heat dissipation when power devices in the power factor correction circuit overheat, thus preventing damage to the power devices due to overheating. The power devices in the power factor correction circuit include: a first switching transistor Q1 and a second switching transistor Q2; The two-stage temperature control protection method for power factor correction circuits proposed in this invention specifically includes the following steps: Step 1: The main controller collects and processes the operating temperature of the power device in real time through the temperature acquisition module at fixed intervals to obtain the current temperature of the power device. The power devices in the power factor correction circuit include: a first switching transistor Q1 and a second switching transistor Q2, each of which corresponds to a heat dissipation device, which can be a fan. Specifically, after the dual-stage temperature control protection system is powered on, the main controller collects the operating temperature of the power device in real time at fixed intervals through a temperature acquisition module installed on the heat sink substrate of the power device or packaged inside the power device. The original temperature sampling values ​​of the first switch Q1 and the second switch Q2 are filtered to eliminate noise interference, and the current temperature of the first switch Q1 and the second switch Q2 are obtained after processing, thus improving the temperature measurement accuracy. At the same time, the first temperature threshold T1 and the second temperature threshold T2 are set according to the working environment and chip parameter specifications.

[0021] Step 2: Determine whether the current temperature of the power device exceeds the first temperature threshold T1; if it does not exceed the threshold, continue monitoring and do not initiate any protection action; otherwise, proceed to step 3. Step 3: If the current temperature of the power device exceeds the first temperature threshold T1, start the fan corresponding to the power device and adjust the fan speed according to the difference between the current temperature of the power device and the first temperature threshold T1. Specifically, when the temperature of a certain switching transistor exceeds the first temperature threshold T1, the cooling fan corresponding to that switching transistor is started, and the fan speed is adjusted according to a preset ratio or non-linear function based on the difference between the current temperature of the switching transistor and the first temperature threshold T1, so as to achieve on-demand cooling and avoid frequent fan start-stop and excessive noise.

[0022] The duty cycle V of the fan is calculated using the following formula: V = (Treal - T1) / (T2 - T1) Treal represents the actual temperature, which can reach up to 100%, thus enabling linear speed-controlled heat dissipation.

[0023] When Treal=T1, the duty cycle is 0% and the fan does not rotate; when Treal=T2, the duty cycle is 100% and the fan rotates at its maximum speed.

[0024] Step 4: Monitor the fan's operating status and continuously obtain the current temperature of the power device. When the current temperature of the power device rises above the second temperature threshold T2, activate the temperature closed-loop control to reduce the power consumption of the power device. While the fan is running, the system continuously monitors temperature changes. When the temperature rises further and exceeds the second temperature threshold T2, it needs to enter a deep protection phase. At this point, it is determined that heat dissipation alone is insufficient to suppress the temperature rise, and power consumption needs to be reduced from the source.

[0025] Furthermore, the deep protection phase specifically includes: Temperature closed-loop control is initiated, using the error between the set reference temperature T2 and the measured temperature as input. An incremental PID controller calculates the duty cycle adjustment. This adjustment is superimposed on the base duty cycle output of the main control loop to form the final output value. By reducing the duty cycle, the conduction time of power devices is reduced, thereby suppressing power loss and slowing down the temperature rise.

[0026] The output of the incremental PID controller is the sum of the current control quantity u(k) and the previous control quantity u(k). The difference Δu(k) is calculated as follows: Δu(k)=u(k) u(k 1)=Kp[e(k) e(k 1)]+Ki×e(k)+Kd[e(k) 2e(k 1)+e(k 2)] Where Kp, Ki, and Kd are the proportional, integral, and derivative gains of the PID controller, respectively; e(k) represents the difference between the actual and theoretical values ​​of the input duty cycle in the k-th control operation; e(k 1) e(k) 2) These represent the differences between the actual and theoretical values ​​of the input duty cycle in the (k-1)th and (k-2)th control operations, respectively.

[0027] The actual and theoretical values ​​of the input duty cycle are obtained as follows: the actual value of the input duty cycle is the duty cycle corresponding to the power device at the current temperature, and the theoretical value can be set as the duty cycle corresponding to the power device at the second temperature threshold T2.

[0028] Furthermore, the difference Δu(k) is used as the duty cycle adjustment amount and superimposed on the base duty cycle of the output of the main control loop power device in the power factor correction circuit to suppress power loss. The main control loop power device in this invention is the first switch Q1 and the second switch Q2.

[0029] When the current temperature of the device drops to or below the second temperature threshold T2 for 2 seconds, the PID control is exited; when it is below the first temperature threshold T1, the fan speed is gradually reduced until it is turned off.

[0030] This novel solution employs dual-temperature threshold graded control, first activating fan cooling and then introducing incremental PID control to adjust the duty cycle, achieving smooth protection by prioritizing heat dissipation before reducing power consumption. This effectively avoids the sudden shocks of traditional over-temperature protection, improving system stability and power device lifespan, while balancing heat dissipation efficiency and operational continuity. It is suitable for high-power-density power electronic systems.

[0031] Example 2 like Figure 2 As shown, this invention also proposes a two-stage temperature control protection system for power factor correction circuits, used to implement the two-stage temperature control protection method for power factor correction circuits proposed in Example 1. This system specifically includes: The temperature acquisition module is used to acquire the operating temperature of the power devices in real time at fixed intervals. The main controller is used to process the real-time acquired operating temperature of the power devices to obtain the current temperature of the power devices; The temperature comparison module is used to determine whether the current temperature of the power device exceeds the first temperature threshold T1 and the second temperature threshold T2. If the current temperature of the power device does not exceed the first temperature threshold T1, monitoring continues and no protection action is initiated. The fan adjustment module is used to start the fan corresponding to the power device when the current temperature of the power device exceeds the first temperature threshold T1, and adjust the fan speed according to the difference between the current temperature of the power device and the first temperature threshold T1. The controller adjustment module is used to activate temperature closed-loop control to reduce the power consumption of the power device when the current temperature of the power device rises above the second temperature threshold T2.

[0032] Example 3 like Figure 3 As shown, this invention proposes a two-stage temperature control protection circuit for a power factor correction circuit. The circuit includes: a first fan, a second fan, a temperature acquisition module, and a main controller; the power factor correction circuit includes: an AC power supply AC, a sampling resistor R1, an inductor L1, a first switching transistor Q1, a second switching transistor Q2, a PWM control module, a first diode D1, a second diode D2, a capacitor C1, an input voltage detection circuit, an input current detection circuit, a power correction module, and a main controller. The input voltage detection circuit is connected to both sides of the AC power supply, and the input current detection circuit samples the input current of the circuit by collecting the voltage across the sampling resistor R1. The system's operating status is determined based on the collected circuit input current. Specifically, if the external power supply is working normally, but the switching transistor is not working and the temperature of the switching transistor does not change, then the switching transistor is considered to be damaged and should be checked. If the external power supply is not working normally, then the power supply section should be considered first.

[0033] The PWM control module drives the first switching transistor Q1 and the second switching transistor Q2. The temperature acquisition module includes a first temperature detection circuit 1 and a second temperature detection circuit 2, which are respectively connected to the first switching transistor Q1 and the second switching transistor Q2. The first fan and the second fan are cooling fans for the two switching transistors. The main controller drives the first fan and the second fan according to the acquisition results of the temperature acquisition module. The first diode D1 and the second diode D2 are fast recovery diodes. The voltage and current signals acquired by the input voltage detection circuit and the input current detection circuit enter the power correction module, thereby controlling the PWM module to perform power correction.

[0034] The first temperature detection circuit 1 is used to detect the temperature of the first switching transistor Q1, and the second temperature detection circuit 2 is used to detect the temperature of the second switching transistor Q2. The first switching transistor Q1 and the second switching transistor Q2 are used to control the transfer of energy and the shaping of the input current to achieve high power factor and bidirectional power flow; while the first diode D1 and the second diode D2 are used for freewheeling to reduce losses and improve overall efficiency.

[0035] The main controller is used to receive the real-time temperatures of the first switch Q1 and the second switch Q2 collected by the temperature acquisition module, process and judge the real-time temperatures, and then adjust the duty cycle of the first fan and the second fan, as well as execute temperature closed-loop control.

[0036] The beneficial effects of this invention are that, compared with the prior art, this invention constructs an intelligent, hierarchical, and collaborative thermal protection system for PFC circuits. Through the combination of "dual threshold triggering + fan speed regulation + incremental PID duty cycle adjustment + smooth mode switching", it realizes the transformation of over-temperature protection from passive cut-off to active regulation, and solves the key problem of reliable operation of high-power PFC systems in high-temperature environments.

[0037] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0038] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0039] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0040] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A two-stage temperature control protection method for power factor correction circuits, characterized in that, Specifically, the steps include the following: The main controller collects and processes the operating temperature of the power device in real time through the temperature acquisition module at fixed intervals to obtain the current temperature of the power device. Determine whether the current temperature of the power device exceeds the first temperature threshold T1; if it does not exceed it, continue monitoring and do not initiate any protection action. If the current temperature of the power device exceeds the first temperature threshold T1, start the fan corresponding to the power device and adjust the fan speed according to the difference between the current temperature of the power device and the first temperature threshold T1. The current temperature of the power device is monitored during fan operation. When the current temperature of the power device rises above the second temperature threshold T2, temperature closed-loop control is activated to reduce the power consumption of the power device. The second temperature threshold T2 is greater than the first temperature threshold T1.

2. The two-stage temperature control protection method for a power factor correction circuit according to claim 1, characterized in that, The main controller collects and processes the operating temperature of the power devices in real time through the temperature acquisition module at fixed intervals, specifically including: The main controller collects the operating temperature of the power device in real time at fixed intervals through a temperature acquisition module installed on the heat sink substrate or inside the package of the power device. The raw temperature sample values ​​are filtered to eliminate noise interference, and the current temperature of the power device is obtained after processing.

3. The two-stage temperature control protection method for a power factor correction circuit according to claim 1, characterized in that, The power device includes a first switching transistor and a second switching transistor.

4. The two-stage temperature control protection method for a power factor correction circuit according to claim 1, characterized in that, The fan speed is adjusted based on the difference between the current temperature of the power device and the first temperature threshold T1, as follows: The fan's duty cycle V is calculated based on the difference between the current temperature and the first temperature threshold T1, using the following formula: V = (Treal - T1) / (T2 - T1) Where Treal is the current temperature of the power device.

5. A two-stage temperature control protection method for a power factor correction circuit according to claim 1, characterized in that, The startup temperature closed-loop control reduces the power consumption of power devices, specifically including: The difference between the second temperature threshold T2 and the current temperature of the power device is used as the input of the incremental PID controller. The incremental PID controller is used to calculate the duty cycle adjustment, and the duty cycle adjustment is superimposed on the base duty cycle output at the previous moment in the main control loop to obtain the final output value.

6. A two-stage temperature control protection method for a power factor correction circuit according to claim 5, characterized in that, The calculation of the duty cycle adjustment using an incremental PID controller specifically includes: The output of the incremental PID controller is the sum of the current control quantity u(k) and the previous control quantity u(k). The difference Δu(k) is used as the duty cycle adjustment amount, and the calculation formula is as follows: Δu(k)=u(k) u(k 1)=Kp[e(k) e(k 1)]+Ki×e(k)+Kd[e(k) 2e(k 1)+e(k 2)] Where Kp, Ki, and Kd are the proportional, integral, and derivative gains of the PID controller, respectively; e(k) represents the difference between the actual and theoretical values ​​of the input duty cycle in the k-th control iteration; e(k 1) e(k) 2) These represent the differences between the actual and theoretical values ​​of the input duty cycle in the (k-1)th and (k-2)th control operations, respectively.

7. A two-stage temperature control protection method for a power factor correction circuit according to claim 6, characterized in that, The actual value of the input duty cycle is the duty cycle corresponding to the power device at the current temperature; The theoretical value of the input duty cycle is the duty cycle corresponding to the power device under the second temperature threshold T2.

8. A two-stage temperature control protection method for a power factor correction circuit according to claim 1, characterized in that, The method also includes: Continuously monitor the current temperature of the power devices in real time and adjust the temperature control protection mode accordingly: If the current temperature of the power device is less than or equal to the second temperature threshold T2 and the duration reaches the preset duration, the temperature closed-loop control will be exited. When the current temperature of the power device is lower than the first temperature threshold T1, the fan speed is gradually reduced until it is turned off.

9. A two-stage temperature control protection system for a power factor correction circuit, used to implement the two-stage temperature control protection method for a power factor correction circuit as described in any one of claims 1-8, characterized in that, include: The temperature acquisition module is used to acquire the operating temperature of the power devices in real time at fixed intervals. The main controller is used to process the real-time acquired operating temperature of the power devices to obtain the current temperature of the power devices; The temperature comparison module is used to determine whether the current temperature of the power device exceeds the first temperature threshold T1 and the second temperature threshold T2. If the current temperature of the power device does not exceed the first temperature threshold T1, monitoring continues and no protection action is initiated. The second temperature threshold T2 is greater than the first temperature threshold T1. The fan adjustment module is used to start the fan corresponding to the power device when the current temperature of the power device exceeds the first temperature threshold T1, and adjust the fan speed according to the difference between the current temperature of the power device and the first temperature threshold T1. The controller adjustment module is used to activate temperature closed-loop control to reduce the power consumption of the power device when the current temperature of the power device rises above the second temperature threshold T2.

10. A computer-readable storage medium storing computer-readable instructions thereon, characterized in that, The computer-readable instructions can be executed by a processor to implement the two-stage temperature control protection method for a power factor correction circuit as described in any one of claims 1-8.

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