Totem pole power factor correction circuit protection method and device and electronic equipment

Abstract

The invention discloses a totem pole power factor correction circuit protection method, a totem pole power factor correction circuit protection device and electronic equipment. The protection method of the totem-pole power factor correction circuit is applied to the totem-pole power factor correction circuit. The totem-pole power factor correction circuit comprises a power supply, an inductor, a first switching tube, a second switching tube, a third switching tube and a fourth switching tube. The protection method of the totem-pole power factor correction circuit comprises the following steps: collecting the current of an inductor and judging whether the current is higher than a set value to obtain a judgment result; if the judgment result is that the current is higher than the preset value, the second switching tube is controlled to be switched off, and after the second switching tube is switched off, the first switching tube is controlled to be switched off in a delayed mode; or, the first switching tube is controlled to be switched off, and after the first switching tube is switched off, the second switching tube is controlled to be switched off in a delayed mode; and if the judgment result is that the current is not higher than the preset value, continuing to collect the current of the inductor. According to the invention, the control of the high-frequency and low-frequency switching tubes is simplified, and the complexity and cost of the controller are reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power electronics technology, and in particular to a protection method, device and electronic equipment for a totem pole power factor correction circuit. Background Art

[0002] Power electronics technology is a technology that converts electrical energy into another form and is widely used in the fields of power transmission, distribution and utilization. Power Factor Correction (PFC) is a common power electronics technology. Its main purpose is to improve the power factor of the power system, reduce the loss of reactive power, and improve the efficiency of electric energy utilization. Totem-Pole PFC is a special PFC topology with the advantages of simple structure and low cost. It is often used in medium and low power power supply systems.

[0003] Existing power factor correction circuits usually use a boost converter structure to adjust the output voltage by controlling the on and off of high-frequency switches, thereby achieving power factor correction. However, this structure has some problems, such as complex control and low efficiency. Therefore, some researchers have proposed a power factor correction circuit (Totem-Pole PFC) using a totem pole structure, which achieves power factor correction by controlling the on and off of high-frequency and low-frequency switches.

[0004] Although the protection method of the totem pole power factor correction circuit solves the problems of the prior art to a certain extent, it still has some defects. Its control is relatively complicated, and it is necessary to control the on and off of the high-frequency and low-frequency switches according to the polarity of the input voltage, which increases the complexity and cost of the controller. Summary of the invention

[0005] The present invention provides a protection method, device and electronic equipment for a totem pole power factor correction circuit, which simplifies the control of high-frequency and low-frequency switching tubes and reduces the complexity and cost of the controller.

[0006] According to one aspect of the present invention, a protection method for a totem pole power factor correction circuit is provided, which is applied to the totem pole power factor correction circuit. The totem pole power factor correction circuit comprises: a power supply, an inductor, a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, wherein a first end of the first switch tube is connected to a first end of the second switch tube and a first end of the inductor, a second end of the second switch tube is connected to a second end of the fourth switch tube, a first end of the fourth switch tube is connected to a first end of the third switch tube and a first end of the power supply, a second end of the power supply is connected to a second end of the inductor, and a second end of the third switch tube is connected to a second end of the first switch tube;

[0007] The protection method of the totem pole power factor correction circuit includes:

[0008] Collecting the current of the inductor and determining whether the current is higher than a set value to obtain a determination result;

[0009] If the judgment result is that the current is higher than the preset value, the second switch tube is controlled to be turned off, and after the second switch tube is turned off, the first switch tube is controlled to be turned off with a delay;

[0010] Alternatively, the first switch tube is controlled to be turned off, and after the first switch tube is turned off, the second switch tube is controlled to be turned off with a delay;

[0011] If the judgment result is that the current is not higher than the preset value, the current of the inductor continues to be collected.

[0012] Optionally, the protection method of the totem pole power factor correction circuit further includes:

[0013] When the current of the inductor is a reverse current, the first switch tube and the second switch tube are controlled to be turned off at the same time.

[0014] Optionally, controlling the first switch tube to delay shutdown includes:

[0015] The first switch tube is controlled to be turned off with a delayed shutdown according to the preset dead time.

[0016] Optionally, controlling the second switch tube to delay shutdown includes:

[0017] The second switch tube is controlled to be turned off with a delay according to the preset dead time.

[0018] Optionally, the preset dead time includes: 50us-100us.

[0019] According to another aspect of the present invention, a protection device for a totem pole power factor correction circuit is provided, and the protection device for the totem pole power factor correction circuit comprises:

[0020] A judgment result determination module, used for collecting the current of the inductor and judging whether the current is higher than a set value to obtain a judgment result;

[0021] A first control module, configured to control the second switch tube to turn off if the judgment result is that the current is higher than a preset value, and after the second switch tube is turned off, control the first switch tube to delay turning off;

[0022] Alternatively, the first switch tube is controlled to be turned off, and after the first switch tube is turned off, the second switch tube is controlled to be turned off with a delay;

[0023] The current collection module is used to continue collecting the current of the inductor if the judgment result is that the current is not higher than the preset value.

[0024] Optionally, the protection device of the totem pole power factor correction circuit further includes a second control module, and the second control module is used to control the first switch tube and the second switch tube to be turned off simultaneously when the current of the inductor is a reverse current.

[0025] Optionally, the first control module is further used to control the first switch tube to delay turning off according to a preset dead time, and control the second switch tube to delay turning off according to a preset dead time.

[0026] According to another aspect of the present invention, there is also provided an electronic device, the electronic device comprising:

[0027] one or more processors;

[0028] A memory for storing one or more programs;

[0029] When the one or more programs are executed by the one or more processors, the one or more processors implement the protection method of the totem pole power factor correction circuit as described in the embodiment of the present invention.

[0030] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the protection method of the totem pole power factor correction circuit as described in the embodiment of the present invention is implemented.

[0031] The technical solution of the embodiment of the present invention simplifies the control of high-frequency and low-frequency switches through the configuration of the ePWM module improved by software, and the control method is simpler. It is not necessary to control the on and off of the high-frequency and low-frequency switches according to the polarity of the input voltage, and no additional complex control logic is required, thereby reducing the complexity and cost of the controller. In summary, the present invention solves the problem that the protection method of the totem pole power factor correction circuit is relatively complex to control, and it is necessary to control the on and off of the high-frequency and low-frequency switches according to the polarity of the input voltage, which increases the complexity and cost of the controller.

[0032] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a flow chart of a protection method for a totem pole power factor correction circuit provided according to an embodiment of the present invention;

[0035] Figure 2 is a structural schematic diagram of a totem pole power factor correction circuit provided according to an embodiment of the present invention;

[0036] Figure 3 It is a control waveform diagram of an existing totem pole power factor correction circuit;

[0037] Figure 4 is a control waveform diagram of a totem pole power factor correction circuit provided according to an embodiment of the present invention;

[0038] Figure 5 It is a structural schematic diagram of a protection device of a totem pole power factor correction circuit provided according to an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Figure 1 It is a flow chart of a protection method for a totem pole power factor correction circuit provided according to an embodiment of the present invention. The method can be executed by a protection device for a totem pole power factor correction circuit provided by an embodiment of the present invention. The device can be implemented in software and / or hardware and can generally be integrated in an electronic device.

[0043] An embodiment of the present invention provides a protection method for a totem pole power factor correction circuit, which is applied to the totem pole power factor correction circuit. Figure 2 is a schematic diagram of a totem pole power factor correction circuit according to an embodiment of the present invention, with reference to Figure 2 The totem pole power factor correction circuit includes: a power supply U, an inductor L, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, wherein a first end of the first switch tube Q1 is connected to a first end of the second switch tube Q2 and a first end of the inductor L, a second end of the second switch tube Q2 is connected to a second end of the fourth switch tube Q4, a first end of the fourth switch tube Q4 is connected to a first end of the third switch tube Q3 and a first end of the power supply U, a second end of the power supply U is connected to a second end of the inductor L, and a second end of the third switch tube Q3 is connected to a second end of the first switch tube Q1; the first switch tube Q1 and the second switch tube Q2 are high-frequency switch tubes, and the third switch tube Q3 and the fourth switch tube Q4 are low-frequency switch tubes.

[0044] Continue to refer Figure 1 , the protection method of the totem pole power factor correction circuit includes:

[0045] S110, collecting the current of the inductor and determining whether the current is higher than a set value to obtain a determination result.

[0046] Specific, combined Figure 2, by using the software ePWM module to generate ePWM1A and ePWM1B signals, respectively, through the control terminal HS-IN of the first switch tube Q1 to control the first switch tube Q1 to be periodically turned on or off, and the LS-IN of the second switch tube Q2 to control the second switch tube Q2 to be periodically turned on or off. The current of the inductor is collected and sent to the ePWM module, and the ePWM module determines whether the current is higher than the set value to obtain the judgment result.

[0047] Define ePWM1A to be set high at the ZREO event and set low at the count comparator CMPA or T1 event (T1 comes from the comparator, trip or synchronization event in the ePWM module). The T1 event is triggered by the inductor current comparator in the ePWM module, and the low ePWM1A is cleared under overcurrent conditions to replace the traditional CBC scheme, thereby improving the protection capability and response speed of the circuit. CBC is a cycle-by-cycle protection mode, which is characterized by setting the PWM output level to a preset level once triggered.

[0048] S120, if the judgment result is that the current is higher than the preset value, the second switch tube is controlled to be turned off, and after the second switch tube is turned off, the first switch tube is controlled to be turned off with a delay;

[0049] Alternatively, the first switch tube is controlled to be turned off, and after the first switch tube is turned off, the second switch tube is controlled to be turned off with a delay.

[0050] Specifically, if the judgment result is that the current is higher than the preset value, it means that an overcurrent event has occurred, and the ePWM module needs to control the first switch tube and the second switch tube through PWM shutdown. The control logic of the positive half-cycle: first control the second switch tube Q2 to shut down, and after the second switch tube Q2 is shut down, control the first switch tube Q1 to delay shutdown. The control logic of the negative half-cycle: first control the first switch tube Q1 to shut down, and after the first switch tube Q1 is shut down, control the second switch tube Q2 to delay shutdown.

[0051] Using the action qualifier (AQ) submodule in the ePWM module, T1 and T2 events (from comparators, trips, or synchronization events) can also generate actions through the action qualifier submodule in the ePWM module. Since the action qualifier submodule is before the dead band (DB) submodule, when using the active high complementary (AHC) mode, the rising edge delay and falling edge delay are usually enabled for the ePWM1A and ePWM1B signals, respectively.

[0052] S130: If the judgment result is that the current is not higher than the preset value, continue to collect the current of the inductor.

[0053] Specifically, the totem pole power factor correction circuit can better cope with transient conditions under overload, light load or fault conditions, improving the stability and reliability of the system. By using the ePWM configuration, efficient and reliable overcurrent protection is achieved, avoiding the risk of power stage under high temperature conditions, and improving the safety and reliability of the system.

[0054] For example, when the PFC enters an overload condition, overcurrent protection is implemented through PWM shutdown control based on the CBC protection mode, thereby limiting the PFC inductor current instead of shutting down the power stage.

[0055] Figure 3 This is a control waveform diagram of the existing totem pole power factor correction circuit. Figure 3 , After the over-current protection in the CBC protection mode, the upper bridge arm and the lower bridge arm are closed at the same time.

[0056] Figure 4 is a control waveform diagram of a totem pole power factor correction circuit provided according to an embodiment of the present invention, with reference to Figure 4 In this embodiment, after the overcurrent protection is triggered, the lower bridge arm is first closed, and then the upper bridge arm is closed in the next cycle of the upper bridge arm, thereby realizing the shutdown of the power level.

[0057] The technical solution of the embodiment of the present invention simplifies the control of high-frequency and low-frequency switches through the configuration of the ePWM module improved by software, and the control method is simpler. It is not necessary to control the on and off of the high-frequency and low-frequency switches according to the polarity of the input voltage, and no additional complex control logic is required, thereby reducing the complexity and cost of the controller. In summary, the present invention solves the problem that the protection method of the totem pole power factor correction circuit is relatively complex to control, and it is necessary to control the on and off of the high-frequency and low-frequency switches according to the polarity of the input voltage, which increases the complexity and cost of the controller.

[0058] Optionally, the protection method of the totem pole power factor correction circuit further includes:

[0059] When the current of the inductor is a reverse current, the first switch tube and the second switch tube are controlled to be turned off at the same time.

[0060] Specifically, for reverse current control, it can be simplified to use traditional CBC protection based on zero current detection events. This protection mechanism is effective for both ePWM1A and ePWM1B, controlling the first switch tube and the second switch tube to be turned off at the same time, thereby improving the protection capability of the circuit.

[0061] Optionally, controlling the first switch tube to delay turning off includes:

[0062] The first switch tube is controlled to be turned off with delay according to the preset dead time.

[0063] Optionally, controlling the second switch tube to delay turning off includes:

[0064] The second switch tube is controlled to be turned off with delay according to the preset dead time.

[0065] Specifically, the application of the improved PWM configuration under high temperature conditions: Under high temperature conditions, the improved PWM configuration avoids risks at the power level and improves the safety and reliability of the system. The PWM of the synchronous switch (in this embodiment, the first switch tube Q1 for the positive half-cycle) should be turned on after the active switch tube is turned off, and have a custom dead time. It should be noted that in the positive half-cycle, the first switch tube Q1 is a synchronous switch tube, and the second switch tube Q2 is an active switch tube; in the negative half-cycle, the first switch tube Q1 is an active switch tube, and the second switch tube Q2 is a synchronous switch tube.

[0066] The improved PWM configuration is adopted, which can turn on the active switch tube immediately after turning off, and has a custom dead time, thereby improving the response speed and efficiency of the system. At the same time, the PWM configuration of the present invention can also automatically work in both the positive half cycle and the negative half cycle, avoiding the shortcomings of the traditional PWM configuration.

[0067] Optionally, the preset dead time includes: 50us-100us.

[0068] Specifically, the dead time is a protection period set during PWM output to prevent the upper and lower bridge arms from being turned on at the same time due to switching speed issues. It is usually also referred to as the PWM response time. The dead time can be customized, for example, it can be 50us-100us.

[0069] Figure 5 is a schematic diagram of a protection device for a totem pole power factor correction circuit according to an embodiment of the present invention, with reference to Figure 5 The embodiment of the present invention provides a protection device for a totem pole power factor correction circuit, which can be configured in an electronic device. The protection device for the totem pole power factor correction circuit includes:

[0070] The judgment result determination module 201 is used to collect the current of the inductor and determine whether the current is higher than a set value to obtain a judgment result;

[0071] The first control module 202 is used for controlling the second switch tube to turn off if the judgment result is that the current is higher than the preset value, and after the second switch tube is turned off, controlling the first switch tube to delay turning off;

[0072] Alternatively, the first switch tube is controlled to be turned off, and after the first switch tube is turned off, the second switch tube is controlled to be turned off with a delay;

[0073] The current collection module 203 is used to continue collecting the current of the inductor if the judgment result is that the current is not higher than the preset value.

[0074] The protection device of the totem pole power factor correction circuit can execute the protection method of the totem pole power factor correction circuit provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the protection method of the totem pole power factor correction circuit.

[0075] Continue to refer Figure 5 Optionally, the protection device of the totem pole power factor correction circuit further includes a second control module 204, and the second control module 204 is used to control the first switch tube and the second switch tube to be turned off simultaneously when the current of the inductor is a reverse current.

[0076] Continue to refer Figure 5 Optionally, the first control module 202 is further configured to control the first switch tube to be turned off with a delay according to a preset dead time, and control the second switch tube to be turned off with a delay according to a preset dead time.

[0077] Figure 6 A schematic diagram of the structure of an electronic device 1 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0078] like Figure 6 As shown, the electronic device 1 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 1 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0079] A number of components in the electronic device 1 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 1 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0080] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, for example, a protection method for a totem pole power factor correction circuit.

[0081] In some embodiments, the protection method of the totem pole power factor correction circuit can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 1 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the protection method of the totem pole power factor correction circuit described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the protection method of the totem pole power factor correction circuit in any other appropriate manner (for example, by means of firmware).

[0082] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0083] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0084] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0085] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0086] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0087] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0088] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0089] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A protection method for a totem pole power factor correction circuit, applied to a totem pole power factor correction circuit, characterized in that: The totem pole power factor correction circuit includes: a power supply, an inductor, a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, wherein a first end of the first switch tube is connected to a first end of the second switch tube and a first end of the inductor, a second end of the second switch tube is connected to a second end of the fourth switch tube, a first end of the fourth switch tube is connected to a first end of the third switch tube and a first end of the power supply, a second end of the power supply is connected to a second end of the inductor, and a second end of the third switch tube is connected to a second end of the first switch tube; The protection method of the totem pole power factor correction circuit includes: Collecting the current of the inductor and determining whether the current is higher than a set value to obtain a determination result; If the judgment result is that the current is higher than the preset value, the second switch tube is controlled to be turned off, and after the second switch tube is turned off, the first switch tube is controlled to be turned off with a delay; Alternatively, the first switch tube is controlled to be turned off, and after the first switch tube is turned off, the second switch tube is controlled to be turned off with a delay; If the judgment result is that the current is not higher than the preset value, the current of the inductor continues to be collected.

2. The method according to claim 1, characterized in that Also includes: When the current of the inductor is a reverse current, the first switch tube and the second switch tube are controlled to be turned off at the same time.

3. The method according to claim 1, characterized in that The controlling the first switch tube to delay shutting down comprises: The first switch tube is controlled to be turned off with a delayed shutdown according to the preset dead time.

4. The method according to claim 3, characterized in that The controlling the second switch tube to delay shutting down comprises: The second switch tube is controlled to be turned off with a delay according to the preset dead time.

5. The method according to claim 4, characterized in that The preset dead time includes: 50us-100us.

6. A protection device for a totem pole power factor correction circuit, characterized in that: include: A judgment result determination module, used for collecting the current of the inductor and judging whether the current is higher than a set value to obtain a judgment result; A first control module, configured to control the second switch tube to turn off if the judgment result is that the current is higher than a preset value, and after the second switch tube is turned off, control the first switch tube to delay turning off; Alternatively, the first switch tube is controlled to be turned off, and after the first switch tube is turned off, the second switch tube is controlled to be turned off with a delay; The current collection module is used to continue collecting the current of the inductor if the judgment result is that the current is not higher than the preset value.

7. The device according to claim 6, characterized in that It also includes a second control module, which is used to control the first switch tube and the second switch tube to be turned off at the same time when the current of the inductor is a reverse current.

8. The device according to claim 6, characterized in that The first control module is further used to control the first switch tube to delay turning off according to a preset dead time, and to control the second switch tube to delay turning off according to a preset dead time.

9. An electronic device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the protection method of the totem pole power factor correction circuit as described in any one of claims 1-5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the protection method of the totem pole power factor correction circuit as described in any one of claims 1-5 is implemented.

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