Fault detection method of staggered PFC circuit, control device and medium

Abstract

The invention relates to the field of PFC circuit control, in particular to a fault detection method of an interlaced PFC circuit, a control device and a medium, and the detection method comprises the steps: controlling the output end of the interlaced PFC circuit to be connected with a load, so as to provide electric energy for the load; receiving a single-path detection instruction; and in response to the instruction, respectively detecting whether each branch of the staggered PFC circuit has a fault. According to the fault detection method of the specific staggered PFC circuit, each branch is independently started to confirm whether a fault exists or not, so that the condition that the branch has the fault can be conveniently and efficiently screened out. When the method is applied to a production line batch production test, the condition that the staggered PFC circuit branch has a fault is screened out, and the method plays an important role in factory quality control.

Description

Technical Field

[0001] The present invention relates to the field of PFC circuit control, and specifically provides a fault detection method, a control device and a medium for an interleaved PFC circuit. Background Art

[0002] The power factor correction (PFC) circuit can effectively improve the power factor to nearly the ideal value of 1, significantly enhance the power supply efficiency and reduce the power grid pollution. Therefore, the PFC circuit has been widely used in electrical equipment in many fields. With the increasing popularity of new energy and microgrids, the role played by the PFC circuit in the household appliance field has become increasingly important, and the required power levels to be addressed have also been continuously increasing. In the face of application scenarios with large currents and high powers, the traditional single-phase PFC circuit is no longer sufficient. Therefore, the interleaved PFC circuit with multiple parallel branches has gradually become the mainstream choice. As the power level increases, compared with the single-phase PFC circuit of the same power level, the interleaved PFC with multiple parallel branches has the advantages of low current harmonics and low power device power levels. The interleaved PFC circuit can not only effectively reduce the high-frequency harmonic components in the current, but also reduce the requirements for the power levels of power devices, thus demonstrating significant cost advantages.

[0003] The interleaved PFC circuit can operate in a single-path mode and an interleaved mode. Taking a two-path interleaved PFC circuit as an example, in the single-path mode, only 1 PFC branch operates, running under the condition of a small load; in the interleaved mode, both branches operate, and the driving pulses have a phase difference of 180 degrees, running under the condition of a heavy load.

[0004] When the PFC circuit is batch-produced and tested on the production line, since the interleaved PFC circuit can also work when one branch is normal, it is very difficult to determine whether all branches are normal when other branches fail and cannot be driven normally. When mass-producing on the factory production line, due to the production line environment and the hardware circuit structure limitations, most interleaved PFCs use on-board reactance, which makes it difficult for us to test the AD signals of each branch one by one through an oscilloscope. Therefore, once there is a fault in the branch that causes abnormal operation, it is very difficult to detect it in time. In this situation, if the load is continuously increased, it may directly cause damage to the power devices. If the long-term single-path working mode is caused by a fault in a certain branch, it will have a significant impact on the service life and safety performance of the PFC circuit.

[0005] Therefore, a reliable and effective detection method for faults in the interleaved PFC branches is crucial for quality control in the multi-path parallel interleaved PFC. It is necessary to develop a reliable and effective detection method for faults in the interleaved PFC branches, which can screen out the cases where there are faults in the branches of the interleaved PFC circuit during batch production and testing on the production line. Summary of the Invention

[0006] To overcome the above - mentioned defects, the present invention provides a fault detection method, a control device and a medium for an interleaved PFC circuit, which can reliably and effectively screen out the situation where there is a fault in the branch of the interleaved PFC circuit.

[0007] In a first aspect, the present invention provides a fault detection method for an interleaved PFC circuit, including:

[0008] S1, connecting the output end of the interleaved PFC circuit to a load to supply electrical energy to the load;

[0009] S2, receiving a single - path detection instruction;

[0010] S3, in response to the instruction, detecting whether there is a fault in each branch of the interleaved PFC circuit respectively.

[0011] Further, in S3, the detecting whether there is a fault in each branch of the interleaved PFC circuit includes:

[0012] S31, turning on the branch to be detected of the interleaved PFC circuit;

[0013] S32, obtaining the input power of the interleaved PFC circuit;

[0014] S33, judging whether there is a fault in this branch according to the input power.

[0015] Further, the obtaining the input power of the interleaved PFC circuit includes:

[0016] Obtaining the main - circuit current of the interleaved PFC circuit;

[0017] Obtaining the main - circuit voltage of the interleaved PFC circuit;

[0018] Obtaining the input power according to the obtained main - circuit current and main - circuit voltage.

[0019] Further, the judging whether there is a fault in this branch according to the input power includes:

[0020] Obtaining the duration for which the input power is greater than a first preset threshold;

[0021] Judging whether the duration is greater than a second preset threshold;

[0022] If not greater, determining that there is a fault in this branch.

[0023] Further, before the step of turning on the branch to be detected of the interleaved PFC circuit, the method further includes:

[0024] Controlling all branches of the interleaved PFC circuit not to be turned on;

[0025] Determine whether the input power of the interleaved PFC circuit is greater than a first preset threshold value.

[0026] Further, after the step of determining whether the input power of the interleaved PFC circuit is greater than the first preset threshold value, the method further includes:

[0027] If the input power of the interleaved PFC circuit is greater than the first preset threshold value, control the branch to be detected of the interleaved PFC circuit to be turned on.

[0028] Further, the load includes an inverter and a compressor, wherein the input end of the inverter is connected to the output end of the interleaved PFC circuit, and the input end of the compressor is connected to the output end of the inverter.

[0029] Further, after the step S33, the step of determining whether there is a fault in the branch according to the input power, the method further includes:

[0030] S34, control the compressor to stop for a preset duration;

[0031] Repeat S31 to S34 until all branches of the interleaved PFC circuit are detected.

[0032] In a second aspect, the present invention provides a control device, including a processor and a storage device, the storage device is adapted to store a plurality of program codes, and the program codes are adapted to be loaded and run by the processor to execute the fault detection method of the interleaved PFC circuit described in the first aspect.

[0033] In a third aspect, the present invention provides a computer-readable storage medium, in which a plurality of program codes are stored, and the program codes are adapted to be loaded and run by a processor to execute the fault detection method of the interleaved PFC circuit described in the first aspect.

[0034] One or more of the above technical solutions of the present invention have at least one or more of the following beneficial effects:

[0035] Through the specific fault detection method of the interleaved PFC circuit of the present invention, each branch is separately started to confirm whether there is a fault, so as to conveniently and efficiently screen out the situation where the branch has a fault.

[0036] The present invention can be applied to mass production testing on the production line to screen out the situation where the branches of the interleaved PFC circuit have faults, which plays an important role in controlling the ex-factory quality. Description of the Drawings

[0037] With reference to the accompanying drawings, the disclosure of the present invention will become more readily understandable. It is easily understood by those skilled in the art that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, where:

[0038] Figure 1 is a schematic diagram of the main steps of a fault detection method for a interleaved PFC circuit according to an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of an interleaved PFC circuit according to an embodiment of the present invention;

[0040] Figure 3 is a schematic diagram of the main steps of a factory test mode according to an embodiment of the present invention;

[0041] Figure 4 is a schematic diagram of the main steps of a normal control mode according to an embodiment of the present invention. Detailed Embodiments

[0042] Some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0043] In the description of the present invention, a "module" and a "processor" may include hardware, software, or a combination of both. A module may include a hardware circuit, various suitable sensors, communication ports, memories, and may also include a software part, such as program code, or a combination of software and hardware. A processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, in hardware, or in a combination of both. A non-transitory computer-readable storage medium includes any suitable medium for storing program code, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and so on.

[0044] Referring to Figure 1 , the present invention provides a fault detection method for an interleaved PFC circuit, including:

[0045] S1, controlling the output end of the interleaved PFC circuit to be connected to a load to supply electrical energy to the load;

[0046] S2, receiving a single-channel detection instruction;

[0047] S3, in response to the instruction, detecting whether there is a fault in each branch of the interleaved PFC circuit respectively.

[0048] When the factory production line is in mass production, in order to detect whether there is a fault in each branch of the interleaved PFC circuit being produced, the detection method of the present invention, i.e., the factory test mode, is enabled.

[0049] First, a load is connected to the output terminal of the interleaved PFC circuit. The load can be an RL resistor or a combination of an inverter and a compressor. Among them, the input terminal of the inverter is connected to the output terminal of the interleaved PFC circuit, and the input terminal of the compressor is connected to the output terminal of the inverter. When applied to the air-conditioning technical field, after starting the air-conditioning compressor, the interleaved PFC circuit supplies power to the air-conditioning compressor.

[0050] After receiving the instruction to enter the factory test mode through the host computer, each branch of the interleaved PFC is separately turned on. If a certain branch has a fault, it cannot operate normally.

[0051] The present invention lies in that through the factory test mode of the interleaved PFC circuit, each branch of the interleaved PFC is automatically tested separately, and it can accurately judge whether there is a fault in the branch. It is applicable to the requirements of mass testing in the factory production line, avoiding the situation where a fault in the interleaved PFC branch cannot be detected, and greatly improving the convenience and accuracy of controlling the quality of products leaving the factory.

[0052] In one embodiment, in step S3, the detecting whether there is a fault in each branch of the interleaved PFC circuit includes:

[0053] S31, controlling the branch to be detected of the interleaved PFC circuit to be turned on;

[0054] S32, obtaining the input power of the interleaved PFC circuit;

[0055] S33, judging whether there is a fault in this branch according to the input power.

[0056] Whether there is a fault in a branch can be detected through steps S31 - S33. After the detection is completed, another branch is detected, and steps S31 - S33 are repeatedly executed in a loop until all branches of the interleaved PFC circuit are detected.

[0057] In one embodiment, in step S32, the obtaining the input power of the interleaved PFC circuit includes:

[0058] S321, obtaining the trunk current of the interleaved PFC circuit;

[0059] S322, obtaining the trunk voltage of the interleaved PFC circuit;

[0060] S323, obtaining the input power according to the obtained trunk current and trunk voltage.

[0061] In one embodiment, in S33, determining whether there is a fault in the branch according to the input power includes:

[0062] S331, obtaining the duration for which the input power is greater than a first preset threshold;

[0063] S332, determining whether the duration is greater than a second preset threshold;

[0064] S333, if it is not greater, determining that there is a fault in the branch.

[0065] If the input power can last for a certain duration, it indicates that there is no fault in the branch to be tested. If the duration cannot reach the second preset threshold after the branch to be tested is turned on, it indicates that there is a fault in the branch.

[0066] Since the interleaved PFC circuit consumes a certain amount of energy when starting up, and at the same time, for some loads such as a compressor connected through an inverter, high voltage is not required at the initial start-up. At this time, before the step of turning on the branch to be detected of the interleaved PFC circuit, the method further includes:

[0067] Controlling all branches of the interleaved PFC circuit not to be turned on;

[0068] Determining whether the input power of the interleaved PFC circuit is greater than a first preset threshold.

[0069] In this way, at the initial stage of the compressor start-up, each branch is first turned off. In the interleaved PFC circuit, only the rectification unit plays a rectification role, and the boost unit does not play a boost role. As the input power increases, after the step of continuously determining whether the input power of the interleaved PFC circuit is greater than a first preset threshold, the method further includes:

[0070] If the input power of the interleaved PFC circuit is greater than a first preset threshold, controlling the branch to be detected of the interleaved PFC circuit to be turned on. After being turned on, the interleaved PFC circuit is used for boosting, and the boosted voltage is transmitted to the compressor as the driving voltage of the compressor.

[0071] Next, it is determined whether there is a fault in the branch through S331 - S333.

[0072] In one embodiment, after the step S33, the step of determining whether there is a fault in the branch according to the input power, the method further includes:

[0073] S34, controlling the compressor to stop for a preset duration.

[0074] Maintaining the compressor in a stopped state for a certain duration, for example, for 30 s, so as to balance the valves of the compressor and facilitate the next start-up.

[0075] Repeat the execution of S31 to S34 until all branches of the interleaved PFC circuit are detected.

[0076] In order to obtain the main circuit current in step S321 and the main circuit voltage in S322, on the basis of the existing interleaved PFC circuit, a test control module is added to execute the method of the present invention. By receiving the obtained main circuit current and main circuit voltage, the input power is calculated, and it is determined whether there is a fault in this branch according to the input power.

[0077] For the circuit structure schematic diagram of the specific interleaved PFC circuit, see Figure 2 .

[0078] The existing interleaved PFC circuit includes: a rectification unit and a boost unit;

[0079] Among them, the rectification unit is used to convert the input alternating current into direct current;

[0080] The boost unit is used to receive the direct current and controllably boost the direct current.

[0081] If the interleaved PFC circuit is used to supply power to an air conditioner compressor, the boosted direct current is converted into alternating current after passing through an inverter and supplied to the compressor.

[0082] The input end of the rectification unit is connected to the AC power supply, and the output end of the rectification unit is connected to the boost unit. The rectification unit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The anode of the first diode D1 and the cathode of the second diode D2 are commonly connected to the first phase of the AC power supply, the anode of the third diode D3 and the cathode of the fourth diode D4 are commonly connected to the second phase of the AC power supply, the cathode of the first diode D1 is connected to the cathode of the third diode D3, and the anode of the second diode D2 is connected to the anode of the fourth diode D4.

[0083] The boost unit includes an energy storage module, a switch control module, a filter module, a resistance module, a PI control module, and a normal control module;

[0084] The energy storage module includes a first inductor L1, a second inductor L2, a fifth diode D5, and a sixth diode D6. Among them, the first end of the first inductor L1 is connected to the cathode of the third diode D3, the second end of the first inductor L1 is connected to the anode of the fifth diode D5, the first end of the first inductor L2 is connected to the cathode of the third diode D3, the second end of the first inductor L2 is connected to the anode of the sixth diode D6, and the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6.

[0085] The resistance module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. Among them, the first resistor R1 is connected to the cathode of the sixth diode D6, the other end of the first resistor R1 is connected to the second resistor R2, the other end of the second resistor R2 is respectively connected to the first end of the third resistor R3, the first end of the fourth resistor R4, and the first end of the fifth resistor R5, and the second end of the third resistor R3 is connected to the anode of the fourth diode D4.

[0086] The switch control module includes a first switch tube and a second switch tube. Among them, the input end of the first switch tube is connected to the second end of the fourth resistor R4, the output end of the first switch tube is connected to the second end of the first inductor L2, the control end of the first switch tube is used to receive the first switch tube drive signal, and the control end of the first switch tube is connected to the normal control module. The second end of the fifth resistor R5 is connected to the input end of the second switch tube, the output end of the second switch tube is connected to the second end of the first inductor L1, the control end of the second switch tube is used to receive the second switch tube drive signal, and the control end of the second switch tube is connected to the normal control module.

[0087] The first switch tube is also connected with a seventh diode D7. The anode of the seventh diode D7 is connected to the input end of the first switch tube, and the cathode of the seventh diode D7 is connected to the output end of the first switch tube. The second switch tube is also connected with an eighth diode D8. The anode of the eighth diode D8 is connected to the input end of the second switch tube, and the cathode of the eighth diode D8 is connected to the output end of the second switch tube.

[0088] The second end of the third resistor R3 is connected to the anode of the fourth diode D4.

[0089] The first switch tube and the second switch tube are both IGBT1 and IGBT2.

[0090] The input ends of the first switch tube and the second switch tube are both the emitters, the output ends of the first switch tube and the second switch tube are both the collectors, and the control ends of the first switch tube and the second switch tube are both the bases.

[0091] The test control module and the normal control module are selected as the MCU.

[0092] Preferably, the fifth diode D5 and the sixth diode D6 are fast recovery diodes.

[0093] The first end and the second end of the third resistor R3 are used for sampling the trunk current. Specifically, the first end and the second end of the third resistor R3 are both connected to the input end of the test control module.

[0094] The filtering module includes a capacitor C1. One end of the capacitor C1 is connected to the first end of a third resistor R3, and the other end of the capacitor C1 is connected to the cathode of a fifth diode D5.

[0095] Both ends of the capacitor C1 can be connected to an inverter as the output end of the interleaved PFC circuit, and then the boosted alternating current is transmitted to the compressor.

[0096] An AC power supply provides input alternating current for the interleaved PFC circuit. The AC power supply is also connected to the input end of a test control module. The test control module is connected to two phases of the AC power supply for obtaining the sampling of the main circuit voltage. The AC power supply is usually 220V alternating current. There are two phases of the sampled main circuit voltage. The absolute value is calculated and the sin trigonometric operation is performed to obtain the phase and amplitude information.

[0097] The PI control module is used to receive the actual voltage between a first resistor R1 and a second resistor R2 and receive the target DC voltage value. The target DC voltage value is generally a value preset by the user. It is calculated and adjusted through a first PI algorithm. According to the current output by the first PI algorithm, the phase information and amplitude information of the obtained main circuit voltage, and the output main circuit current, it is calculated and adjusted through a second PI algorithm and input to the input end of the normal control module for the control of starting in the normal mode.

[0098] The output voltage of the interleaved PFC circuit follows the phase and amplitude of the input voltage through the PI control module.

[0099] The input end of the test control module receives the main circuit current and the main circuit voltage. Among them, the voltage output by the AC power supply is the main circuit voltage, and the current flowing through the third resistor R3 is the main circuit current.

[0100] The output end of the test control module can be used to output the driving signals of the first switching tube and the second switching tube, to automatically detect the faults of all branches, control each branch to be turned on separately, and turn off the branch after the test is completed. It can also not output the driving signals of the first switching tube and the second switching tube, and only analyze whether there are faults in each branch after obtaining the main circuit voltage and the main circuit current.

[0101] The output end of the normal control module is used to output the driving signal of the first switching tube (the driving signal of the first IGBT) and the driving signal of the second switching tube (the driving signal of the second IGBT). The output end of the normal control module is respectively connected to the control ends of two switching tubes (IGBTs).

[0102] When the normal control module and the test control module are integrated into one controller, it can be used in the normal control mode or start the factory test mode. After the factory test mode test is completed by the test control module that executes the fault detection method of the present invention, the test can be ended or the normal control mode can be continued through the normal control module.

[0103] Referring to Figure 3 , in an application scenario, the control process of the factory test mode is as follows.

[0104] After the compressor starts, neither the first PFC branch (denoted as CH1) nor the second PFC branch (denoted as CH2) is turned on;

[0105] Detect the input power, which is obtained according to the product of the trunk current and the trunk voltage;

[0106] If the input power is greater than the first preset threshold, control to turn on the single-branch detection mode.

[0107] The single-branch detection mode is to detect each branch separately. Specifically, if the branch of the interleaved PFC circuit to be detected is the first PFC branch, control to turn on CH1;

[0108] Judge whether the duration is lower than the second preset threshold, for example, whether it lasts for 3 minutes;

[0109] If the duration is greater than or equal to the second preset threshold, it means that the CH1 branch has no fault. If the duration is less than the second preset threshold, for example, it cannot last for 3 minutes, it means that the CH1 branch has a fault and needs to be repaired in time.

[0110] After judging whether the branch has a fault, control the compressor to stop.

[0111] Maintain the compressor in the stopped state for a certain duration, for example, for 30 seconds.

[0112] Next, judge whether the other branch CH2 has a fault, which is similar to the judgment method of the above CH1 branch.

[0113] After the compressor starts, neither CH1 nor CH2 branch is turned on;

[0114] Detect whether the input power is greater than the first preset threshold;

[0115] If it is greater, control to turn on the single-branch detection mode;

[0116] If the branch of the interleaved PFC circuit to be detected is the second PFC branch, control to turn on CH2;

[0117] Obtain the duration for which the interleaved PFC circuit meets the turn-on condition after the branch is turned on;

[0118] Determine whether the duration is lower than a second preset threshold, such as whether it lasts for 3 minutes;

[0119] If the duration is greater than or equal to the second preset threshold, it indicates that the CH2 branch has no fault. If the duration is less than the second preset threshold, such as it cannot last for 3 minutes, it indicates that the CH2 branch has a fault and needs to be repaired in time.

[0120] After determining whether the branch has a fault, control the compressor to stop.

[0121] Maintain the compressor in the stopped state for a certain duration, such as 30 seconds, to balance the valves of the compressor.

[0122] After determining all the PFC branches, you can choose to enable the normal control mode or stop and only perform fault detection.

[0123] The normal control mode refers to Figure 4 , including the following steps:

[0124] Receive the normal control mode instruction from the host computer. The initial interleaved PFC is in the non-turn-on state; control the compressor to start;

[0125] Neither the first PFC branch CH1 nor the second PFC branch CH2 is turned on;

[0126] Judgment in the non-turn-on state: Detect whether the input power is greater than the power threshold 1, i.e., the first preset threshold;

[0127] If it is greater, the interleaved PFC switches to the single-path mode and turns on CH1;

[0128] Judgment in the single-path mode: After CH1 is turned on, detect whether the input power is greater than the power threshold 2;

[0129] If it is greater, control both CH1 and CH2 to be turned on, and the interleaved PFC switches to the interleaved mode. If the input power is not greater than the power threshold 2, continue to judge whether the input power is less than the power threshold 3. If it is less, turn off CH1 and CH2 of the PFC and be in the non-turn-on state. If the input power is not less than the power threshold 3, it operates in the single-path mode and turns on CH1.

[0130] Judgment in the interleaved mode: When both branches CH1 and CH2 are turned on, judge whether the input power is less than the power threshold 4. If it is less, the interleaved PFC switches to the single-path mode and turns on CH1. If the input power is not less than the power threshold 4, it operates in the interleaved mode and turns on both CH1 and CH2.

[0131] In an application scenario, the power threshold 1 is 500W, the power threshold 2 is 1000W, the power threshold 3 is 400W, and the power threshold 4 is 900W.

[0132] The control method for the factory test mode can automatically test each branch where the PFC is separately turned on by obtaining the main circuit voltage and main circuit current and making a judgment. If a fault occurs in a branch, it cannot operate normally.

[0133] It should be noted that although two branches are taken as examples in the embodiments of the present invention and are described with two-phase interleaving, the present invention is not limited to two-phase interleaving and is equally applicable to multi-phase interleaving, that is, the case where the number of branches is greater than 2.

[0134] The present invention adds a test control module by obtaining the main circuit current and main circuit voltage in the original interleaved PFC circuit, and runs the fault detection method of the interleaved PFC circuit of the method of the present invention to implement the factory test mode, and automatically tests each branch of the interleaved PFC separately, and can accurately judge whether there is a fault in the branch. It is applicable to the requirements of batch testing in the factory production line, avoids the situation where a fault in the interleaved PFC branch cannot be detected, and greatly improves the convenience and accuracy of controlling the product quality at the time of leaving the factory.

[0135] Those skilled in the art can understand that for all or part of the processes in the method of the above-mentioned embodiment of the present invention, the test control module can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable storage medium can include: any entity or device, medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal, and software distribution medium that can carry the computer program code. It should be noted that the content included in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0136] Furthermore, the present invention also provides a control device. In an embodiment of the control device according to the present invention, the control device includes a processor and a storage device. The storage device can be configured to store a program for executing the fault detection method of the interleaved PFC circuit in the above method embodiment. The processor can be configured to execute the program in the storage device, and the program includes, but is not limited to, the program for executing the fault detection method of the interleaved PFC circuit in the above method embodiment. For ease of description, only the parts related to the embodiments of the present invention are shown. For the specific technical details not disclosed, please refer to the method part of the embodiments of the present invention. The control device can be a control device formed by various electronic devices.

[0137] Furthermore, the present invention also provides a computer-readable storage medium. In an embodiment of the computer-readable storage medium according to the present invention, the computer-readable storage medium can be configured to store a program for executing the fault detection method of the interleaved PFC circuit in the above method embodiment. The program can be loaded and run by a processor to implement the fault detection method of the above interleaved PFC circuit. For ease of description, only the parts related to the embodiments of the present invention are shown. For the specific technical details not disclosed, please refer to the method part of the embodiments of the present invention. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiments of the present invention is a non-transitory computer-readable storage medium.

[0138] Furthermore, it should be understood that since the setting of each module is only for illustrating the functional units of the device of the present invention, the corresponding physical devices of these modules can be the processor itself, or a part of the software in the processor, a part of the hardware, or a part combined by software and hardware. Therefore, the number of each module in the figure is only illustrative.

[0139] Those skilled in the art can understand that the various modules in the device can be adaptively split or combined. Such splitting or combination of specific modules will not cause the technical solution to deviate from the principle of the present invention. Therefore, the technical solutions after splitting or combination will all fall within the protection scope of the present invention.

[0140] It should be noted that although the above steps are described in a specific order in the above embodiments, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these changes are all within the protection scope of the present invention.

[0141] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A fault detection method for an interleaved PFC circuit, characterized in that, Including: S1, connecting the output terminal of the interleaved PFC circuit to a load to supply electrical energy to the load; S2, receiving a single-channel detection instruction; S3, in response to the instruction, detecting whether there is a fault in each branch of the interleaved PFC circuit respectively.

2. The method according to claim 1, characterized in that, In S3, the detecting whether there is a fault in each branch of the interleaved PFC circuit includes: S31, controlling the branch to be detected of the interleaved PFC circuit to be turned on; S32, obtaining the input power of the interleaved PFC circuit; S33, judging whether there is a fault in this branch according to the input power.

3. The method according to claim 2, characterized in that, The obtaining the input power of the interleaved PFC circuit includes: Obtaining the main circuit current of the interleaved PFC circuit; Obtaining the main circuit voltage of the interleaved PFC circuit; Obtaining the input power according to the obtained main circuit current and main circuit voltage.

4. The method according to claim 2, wherein The judging whether there is a fault in this branch according to the input power includes: Obtaining the duration for which the input power is greater than a first preset threshold; Judging whether the duration is greater than a second preset threshold; If it is not greater than, determining that there is a fault in this branch.

5. The method according to claim 2, characterized in that Before the step of controlling the branch to be detected of the interleaved PFC circuit to be turned on, the method further includes: Controlling all branches of the interleaved PFC circuit not to be turned on; Judging whether the input power of the interleaved PFC circuit is greater than a first preset threshold.

6. The method according to claim 5, characterized in that, After the step of judging whether the input power of the interleaved PFC circuit is greater than a first preset threshold, the method further includes: If the input power of the interleaved PFC circuit is greater than a first preset threshold, controlling the branch to be detected of the interleaved PFC circuit to be turned on.

7. The method according to claim 2, characterized in that The load includes an inverter and a compressor, wherein the input end of the inverter is connected to the output end of the interleaved PFC circuit, and the input end of the compressor is connected to the output end of the inverter.

8. The method according to claim 7, wherein After the step S33, the step of judging whether there is a fault in this branch according to the input power, the method further includes: S34, controlling the compressor to stop for a preset duration; Repeating S31 to S34 until all branches of the interleaved PFC circuit are detected.

9. A control device, comprising a processor and a storage device, the storage device being adapted to store a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to execute the fault detection method of the interleaved PFC circuit according to any one of claims 1 to 8.

10. A computer-readable storage medium storing multiple program codes, characterized in that, The program code is adapted to be loaded and run by the processor to execute the fault detection method of the interleaved PFC circuit according to any one of claims 1 to 8.

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