Power factor correction circuit, control method and identification method thereof, and storage medium

Abstract

The invention provides a power factor correction circuit, a control method thereof, an identification method and a storage medium, the power factor correction circuit comprises an inductor module, a power regulation module and a switch module, the inductor module comprises a plurality of inductors connected in sequence, the power regulation module is connected to the inductor module, and the switch module comprises a plurality of switch devices. The switching devices are in one-to-one correspondence with the inductors and are connected to the two ends of the corresponding inductors. According to the embodiment of the invention, the inductor module is provided with the plurality of inductors, and the two ends of the plurality of inductors are connected with the switching devices, so that the inductor module can select a proper target access inductance value according to the operation parameters of the current load, and then select a proper target switching device based on the target access inductance value. Therefore, the total access inductance value of the inductance module can be reasonably adjusted, the current fluctuation during PFC mode switching is reduced, and the stability of the system is improved; and moreover, the loss caused by overlarge access inductance can be reduced, and the efficiency of the system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a power factor correction circuit and a control method, an identification method and a storage medium thereof. Background Art

[0002] In the related art, for household appliances such as air conditioners or refrigerators, a multi-state PFC (Power Factor Correction) circuit is usually set up, and an inductor compensation method is used to improve the power factor to ensure that the harmonics are within the required range. However, since the current multi-state PFC circuits all use a single inductor, the current fluctuation will become larger when switching the PFC mode, thereby affecting the stability of the system; and in order to take into account multiple working modes, a large inductor is often selected, which has a large loss in the inductor, thereby affecting the improvement of system efficiency. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a power factor correction circuit and a control method, an identification method and a storage medium thereof, which can improve the stability and efficiency of the system.

[0004] In a first aspect, an embodiment of the present application provides a power factor correction circuit, including:

[0005] An inductor module, comprising a plurality of inductors connected in sequence;

[0006] A power regulation module connected to the inductor module;

[0007] A switch module, comprising a plurality of switch devices, wherein the switch devices correspond to the inductors one by one, and the switch devices are connected to two ends of the corresponding inductors;

[0008] A control module is connected to the power regulating module and the switch module, the control module is used to determine the target access inductance according to the operating parameters of the load, and determine a number of target switch devices from the switch module according to the target access inductance, and the control module is also used to control the switching frequency of the power regulating module and the on-off state of the target switch device.

[0009] According to some embodiments of the present application, the power factor correction circuit also includes a current detection module, which is connected to the inductance module and the control module, and the current detection module is used to detect the current value flowing through the inductance module before switching the target switching device, or to detect the current value flowing through the inductance module before and after switching the target switching device.

[0010] According to some embodiments of the present application, the power factor correction circuit further includes an energy storage module, one side of the energy storage module is connected to the power regulation module, and the other side is used to be connected to the load.

[0011] According to some embodiments of the present application, the power factor correction circuit further includes a rectifier module, an AC input side of the rectifier module is used to connect to the mains, and a DC output side of the rectifier module is connected to the inductor module.

[0012] According to some embodiments of the present application, both ends of all the inductors are connected to the switching devices, or both ends of some of the inductors are connected to the switching devices.

[0013] In a second aspect, an embodiment of the present application provides a control method for a power factor correction circuit, wherein the power factor correction circuit includes an inductor module, a power regulation module, and a switch module, wherein the inductor module includes a plurality of inductors connected in sequence, the power regulation module is connected to the inductor module, and the switch module includes a plurality of switch devices, wherein the switch devices correspond to the inductors one by one, and the switch devices are connected to the two ends of the corresponding inductors; the control method includes:

[0014] Obtaining operating parameters of the load, and determining a target connected inductance according to the operating parameters;

[0015] Determining a plurality of target switch devices from the switch module according to the target access inductance;

[0016] Controlling the switching frequency of the power regulation module and the on / off state of the target switching device.

[0017] According to some embodiments of the present application, determining the target connected inductance according to the operating parameter includes:

[0018] Obtaining input voltage, output voltage, power factor correction efficiency, ripple current coefficient and switching frequency of the power factor correction circuit;

[0019] Determine a duty cycle corresponding to the input voltage according to the input voltage and the output voltage;

[0020] The target connected inductance is determined according to the operating parameters, the power factor correction efficiency, the input voltage, the duty cycle, the ripple current coefficient and the switching frequency.

[0021] According to some embodiments of the present application, controlling the switching frequency of the power regulation module and the on-off state of the target switching device includes:

[0022] Detecting a minimum current value flowing through the inductor module;

[0023] Adjusting the switching frequency of the power regulating module until the minimum current value is less than a first preset current value;

[0024] Detecting a real-time current value flowing through the inductor module;

[0025] When the real-time current value is less than a second preset current value, the on-off state of the target switching device is switched, wherein the second preset current value is greater than or equal to the first preset current value.

[0026] According to some embodiments of the present application, controlling the switching frequency of the power regulation module and the on-off state of the target switching device includes:

[0027] Get the current connected inductance;

[0028] Controlling the switching frequency of the power regulation module according to the current connected inductance and the target connected inductance;

[0029] Switching the on and off state of the target switching device.

[0030] According to some embodiments of the present application, controlling the switching frequency of the power regulation module according to the current connected inductance and the target connected inductance includes one of the following:

[0031] When the target connected inductance is greater than the current connected inductance, keeping the switching frequency of the power regulating module unchanged;

[0032] When the target connected inductance is less than or equal to the current connected inductance, the switching frequency of the power regulation module is increased.

[0033] In a third aspect, an embodiment of the present application provides a method for identifying a power factor correction circuit. Based on the control method of the second aspect, the identification method includes:

[0034] Detecting a first current value flowing through the inductor module before the target switch device is switched, and a second current value flowing through the inductor module after the target switch device is switched;

[0035] A switching result of the inductor corresponding to the target switching device is identified according to the first current value and the second current value.

[0036] According to some embodiments of the present application, identifying the switching result of the inductor corresponding to the target switching device according to the first current value and the second current value includes one of the following:

[0037] When the current difference between the first current value and the second current value is greater than or equal to a preset difference, it is determined that the inductor corresponding to the target switching device is switched successfully;

[0038] When the current difference between the first current value and the second current value is smaller than a preset difference, it is determined that the inductor corresponding to the target switching device has failed to switch.

[0039] In a fourth aspect, an embodiment of the present application provides a power factor correction circuit, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method described in the second aspect and / or the identification method described in the third aspect when running the computer program.

[0040] In a fifth aspect, an embodiment of the present application provides an electrical device, comprising the power factor correction circuit of the first aspect or the fourth aspect mentioned above.

[0041] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method described in the second aspect above and / or the identification method described in the third aspect above.

[0042] The technical solution according to the embodiment of the present application includes but is not limited to the following technical effects: the embodiment of the present application includes an inductor module, a power regulation module, a switch module and a control module, wherein the inductor module includes a plurality of inductors connected in sequence, the power regulation module is connected to the inductor module, the switch module includes a plurality of switch devices, the switch devices and the inductors correspond one to one, the switch devices are connected to the two ends of the corresponding inductors, the control module is connected to the power regulation module and the switch module, the control module is used to determine the target connected inductance according to the operating parameters of the load, and select a plurality of target switch devices from the switch module according to the target connected inductance, and the control module is also used to control the switching frequency of the power regulation module and the on-off state of the target switch device. Since the inductor module of the embodiment of the present application is provided with a plurality of inductors, and the two ends of a plurality of inductors are connected with switching devices, the embodiment of the present application can select a suitable target access inductance according to the operating parameters of the current load, and then select a suitable target switching device based on the target access inductance, so that the total access inductance of the inductor module can be reasonably adjusted, the current fluctuation when switching the PFC mode can be reduced, and the stability of the system can be improved; and the embodiment of the present application can also reduce the loss caused by excessive access inductance, so as to improve the efficiency of the system.

[0043] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0045] Figure 1 is a schematic diagram of the structure of a power factor correction circuit provided by an embodiment of the present application;

[0046] Figure 2 It is a structural schematic diagram of an inductor module and a switch module in a power factor correction circuit provided by an embodiment of the present application;

[0047] Figure 3 is a structural schematic diagram of an inductor module and a switch module in a power factor correction circuit provided by another embodiment of the present application;

[0048] Figure 4 It is a structural schematic diagram of a switch tube combination mode of a power regulation module in a power factor correction circuit provided by an embodiment of the present application;

[0049] Figure 5 It is a structural schematic diagram of a switch tube combination mode of a power regulation module in a power factor correction circuit provided by another embodiment of the present application;

[0050] Figure 6 It is a structural schematic diagram of a switch tube combination mode of a power regulation module in a power factor correction circuit provided by another embodiment of the present application;

[0051] Figure 7 It is a structural schematic diagram of a switch tube combination mode of a power regulation module in a power factor correction circuit provided by another embodiment of the present application;

[0052] Figure 8 It is a structural schematic diagram of a combination of diodes in a power factor correction circuit provided by an embodiment of the present application;

[0053] Fig. 9 It is a structural schematic diagram of a combination of diodes in a power factor correction circuit provided by another embodiment of the present application;

[0054] Fig.10 It is a structural schematic diagram of a combination of diodes in a power factor correction circuit provided by another embodiment of the present application;

[0055] Fig.11 It is a structural schematic diagram of a combination of diodes in a power factor correction circuit provided by another embodiment of the present application;

[0056] Fig.12is a flow chart of a control method of a power factor correction circuit provided by an embodiment of the present application;

[0057] Fig.13 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0058] Fig.14 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0059] Fig.15 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0060] Fig.16 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0061] Fig.17 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0062] Fig.18 is a flow chart of a method for identifying a power factor correction circuit provided by an embodiment of the present application;

[0063] Fig.19 is a flow chart of a method for identifying a power factor correction circuit provided by another embodiment of the present application;

[0064] Fig. 20 is a flow chart of a method for identifying a power factor correction circuit provided by another embodiment of the present application;

[0065] Fig.21 It is an overall flow chart of a control method of a power factor correction circuit provided by an embodiment of the present application;

[0066] Fig. 22 yes Fig.21 A schematic diagram of current control during inductor switching in the control method shown in FIG.

[0067] Fig.23 yes Fig.21 Schematic diagram of PFC drive and inductor current in the control method shown in;

[0068] Fig.24 It is an overall flow chart of a method for identifying a power factor correction circuit provided by an embodiment of the present application;

[0069] Fig.25 yes Fig.24 The identification method shown in the schematic diagram of PFC drive and different inductor currents at the same switching frequency;

[0070] Fig.26yes Fig.24 The identification method shown in the figure shows the PFC control and current change diagram when the inductance decreases;

[0071] Fig. 27 yes Fig.24 The identification method shown in the figure shows the change of PFC control current when the inductance increases;

[0072] Fig.28 It is a structural diagram of a system architecture platform for executing a control method or an identification method for a power factor correction circuit provided by an embodiment of the present application. DETAILED DESCRIPTION

[0073] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0074] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0075] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0076] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0077] In some cases, with the increasing popularity of household appliances such as washing machines, refrigerators, air conditioners and other products, household appliances have become large electricity users. The use of power factor correction can improve the power factor of household appliances and reduce the loss of reactive power in power transmission, which has become a standard feature of major household appliances. Power factor correction technology is divided into passive power factor correction (PPFC) and active power factor correction (APFC). PPFC uses a large inductor in series on the line to filter the current into a sine wave, reduce the current distortion rate, and the power factor can reach 0.9; while APFC uses a boost circuit composed of active devices such as IGBT and other switching devices to achieve current regulation, and the power factor can reach 0.99. However, the active power factor uses high-frequency switching devices, which leads to an increase in additional losses and reduces the efficiency of the system. Therefore, after the power factor meets the requirements of the power grid, how to reduce the loss of the power factor correction circuit and improve the efficiency of household appliances has become the focus of people's concern.

[0078] For electrical equipment such as air conditioners or refrigerators, a multi-state PFC circuit is usually set up to dynamically adjust the switching frequency of the PFC, and use inductor compensation to improve the power factor to ensure that the harmonics are within the required range. However, since the current multi-state PFC circuits all use a single inductor, the inductance will not be adjusted in real time with the change of the switching frequency. Therefore, when switching the PFC mode, the current fluctuation will become larger, thereby affecting the stability of the system; and in order to take into account multiple working modes, large inductors are often selected, and the inductor loss is large, thus affecting the improvement of system efficiency.

[0079] Based on the above situation, the embodiments of the present application propose a power factor correction circuit and a control method, an identification method and a storage medium thereof, aiming to improve the stability and efficiency of the system.

[0080] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0081] like Figure 1 As shown, Figure 1 It is a structural schematic diagram of a power factor correction circuit provided by an embodiment of the present application.

[0082] In one embodiment, the power factor correction circuit of the embodiment of the present application includes but is not limited to an inductor module 100, a power regulation module 200, a switch module 300 and a control module, wherein the inductor module 100 is connected to the power regulation module 200, the inductor module 100 includes but is not limited to a plurality of inductors connected in sequence, the switch module 300 includes but is not limited to a plurality of switch devices, the switch devices and the inductors correspond one to one, and the switch devices are connected to both ends of the corresponding inductors; in addition, the control module is respectively connected to the power regulation module 200 and the switch module 300.

[0083] It should be noted that the number of inductors in the inductor module 100 may be two, three, or more. The embodiment of the present application does not specifically limit the number of inductors in the inductor module 100.

[0084] In addition, it should be noted that the inductance of each inductor in the inductor module 100 may be equal or unequal, and the embodiment of the present application does not specifically limit the inductance of each inductor in the inductor module 100 .

[0085] It is worth noting that the embodiment of the present application can control the on-off state of the switching device to control the switching state of the corresponding inductor. For example, since the two ends of the switching device are respectively connected to the two ends of the corresponding inductor, the embodiment of the present application can control the switching device to be turned on, so that the corresponding inductor is short-circuited, and the inductance of the inductor is not included in the total inductance of the inductor module 100; on the contrary, the embodiment of the present application can control the switching device to be turned off, so that the corresponding inductor is not short-circuited, and the inductance of the inductor is included in the total inductance of the inductor module 100.

[0086] It should be noted that the corresponding relationship between the number of inductors and switch devices may include but is not limited to the following two situations: First, Figure 2 As shown, both ends of all inductors are connected with switch devices, that is, both ends of each inductor are connected with corresponding switch devices. In this case, the embodiment of the present application can control the switching state of any inductor through the switch device. Figure 3 As shown, both ends of a portion of the inductors are connected with switching devices, while both ends of another portion of the inductors are not connected with switching devices.

[0087] In addition, it should be noted that the connection method between the switching device and the inductor can be that the switching device is directly connected in parallel with the inductor, that is, the two ends of the switching device are directly connected to the two ends of the inductor respectively; or the inductor and other components such as a resistor are connected in series and then connected in parallel with the switching device, that is, at least one end of the switching device is indirectly connected to the inductor through other components; in this regard, the embodiment of the present application does not specifically limit the connection method between the switching device and the inductor.

[0088] In addition, it should be noted that the structural type of the above-mentioned switching device can be a relay, a switching tube, or other devices that can control on and off. The embodiment of the present application does not specifically limit the structural type of the switching device.

[0089] Among them, the relay is an electrical control device. When the change of the input quantity reaches the specified requirements, it causes the controlled quantity to undergo a predetermined step change in the electrical output circuit. It has an interactive relationship between the input circuit and the output circuit. In fact, it is a switch that uses a small current to control the operation of a large current. The relay is an automatic switching element with isolation function, which plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0090] For example, when an electromagnetic relay is used as a switching device, the embodiment of the present application can respectively connect the two ends of the output circuit of the relay to the two ends of the corresponding inductor, and control the suction force generated by the current of the input circuit between the electromagnet core and the armature, thereby controlling the on and off of the output circuit, thereby short-circuiting the inductor or not short-circuiting the inductor.

[0091] In addition, it should be noted that the above-mentioned power regulation module 200 may include one switching tube or multiple switching tubes. The embodiment of the present application does not specifically limit the number of switching tubes in the power regulation module 200.

[0092] In addition, the above-mentioned switch tube may be a field effect tube, a triode, or other switch tube capable of controlling on and off. The embodiment of the present application does not specifically limit the structural type of the switch tube.

[0093] For example, when an NPN transistor is used as a switching device, the embodiment of the present application can connect the collector and emitter of the NPN transistor to the two ends of the inductor respectively, and then control the current between the collector and the emitter by controlling the voltage of the base of the NPN transistor, thereby achieving on and off between the collector and the emitter, thereby short-circuiting the inductor or not short-circuiting the inductor.

[0094] Specifically, the combination of the switch tubes in the power regulation module 200 may include but is not limited to: Figures 4 to 7 The four methods may also include other methods. The embodiment of the present application does not specifically limit the combination of switch tubes in the power regulation module 200.

[0095] It is worth noting that the above-mentioned control module can be connected to the load side to obtain the operating parameters of the load side; secondly, since the control module is connected to the power regulation module 200, the embodiment of the present application can also control the switching frequency of the power regulation module 200; in addition, since the control module is connected to the switching device, the embodiment of the present application can also control the on-off state of the switching device.

[0096] Since the inductor module 100 of the embodiment of the present application is provided with a plurality of inductors, and the two ends of a plurality of inductors are connected with switching devices, the embodiment of the present application can select a suitable target access inductance according to the operating parameters of the current load, and then select a suitable target switching device based on the target access inductance, so that the total access inductance of the inductor module 100 can be reasonably adjusted, the current fluctuation when switching the PFC mode can be reduced, and the stability of the system can be improved; and the embodiment of the present application can also reduce the loss caused by excessive access inductance, so as to improve the efficiency of the system.

[0097] For example, in the case of light load, the embodiment of the present application can be connected to the inductor module 100 with large inductance to achieve power factor correction and make the input current harmonics meet the standard requirements. Alternatively, in the case of heavy load, the embodiment of the present application can be connected to the inductor module 100 with small inductance, and the inductor module 100 and the power regulation module 200 can be matched to achieve high-frequency operation of the power regulation module 200, and realize high-frequency PFC function, thereby achieving power factor correction and making the input current harmonics meet the standard requirements.

[0098] In one embodiment, the power factor correction circuit of the embodiment of the present application also includes but is not limited to a current detection module 400, which is connected to the inductor module 100 and the control module, wherein the current detection module 400 is used to detect the current value flowing through the inductor module 100 before switching the target switching device, or the current detection module 400 is used to detect the current value flowing through the inductor module 100 before and after switching the target switching device.

[0099] It is understandable that the above-mentioned current detection module 400 may be a sampling resistor structure, a current transformer structure, or other structures. The embodiment of the present application does not specifically limit the structure of the current detection module 400.

[0100] In one embodiment, the power factor correction circuit of the embodiment of the present application further includes but is not limited to an energy storage module, one side of the energy storage module is connected to the power regulation module 200, and the other side is used to connect to the load.

[0101] Specifically, the embodiment of the present application can control the charging and discharging of the inductor module 100 and the energy storage module by controlling the power regulation module 200. For example, Figure 1As shown, in the case where the switch tube in the power regulation module 200 is a triode, when the control module outputs a high level to the base of the switch tube S1, the collector and the emitter of the switch tube S1 are connected, and at this time the current of the mains will flow through the inductor module 100 and the switch tube S1, thereby charging the inductor module 100; when the control module outputs a low level to the base of the switch tube S1, the collector and the emitter of the switch tube S1 are disconnected, and at this time the current of the mains will flow through the inductor module 100 and the energy storage module, thereby charging the energy storage module, and the voltage across the energy storage module is the voltage supplied to the load. Alternatively, when the switch tube in the power regulation module 200 is a field effect tube, when the control module outputs a high level to the gate of the switch tube, the source and drain of the switch tube are connected, and the current of the AC power will flow through the inductor module 100 and the switch tube, thereby charging the inductor module 100; when the control module outputs a low level to the gate of the switch tube, the source and drain of the switch tube are disconnected, and the current of the AC power will flow through the inductor module 100 and the energy storage module, thereby charging the energy storage module, and the voltage across the energy storage module is the voltage supplied to the load.

[0102] It is understandable that the above-mentioned energy storage module may include a capacitor, a capacitor and a resistor, or other energy storage devices. The embodiment of the present application does not specifically limit the structure of the energy storage module.

[0103] In one embodiment, the power factor correction circuit may also include a rectification function, wherein the embodiment of the present application may perform rectification through but not limited to the following two structural modes: First, the power factor correction circuit of the embodiment of the present application may include but not limited to a rectifier module, wherein the AC input side of the rectifier module is used to connect to the mains, and the DC output side of the rectifier module is connected to the inductor module 100. Second, the power factor correction circuit of the embodiment of the present application may perform rectification through the original power regulation module 200. For example, the power regulation module 200 of the Vienna architecture can achieve rectification by controlling the switching state of each switch tube.

[0104] In one embodiment, the rectifier device between the power regulation module 200 and the load can be as follows: Figure 1 The structure of the single diode D1 shown in FIG. Figures 8 to 11 The four methods may also be other methods. The embodiment of the present application does not specifically limit the structural method of the rectifier device between the power regulation module 200 and the load.

[0105] Those skilled in the art will appreciate that the structure described above does not constitute a limitation on the power factor correction circuit, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0106] Based on the hardware structure of the power factor correction circuit described above, various embodiments of the control method of the power factor correction circuit of the present application are proposed below.

[0107] like Fig.12 As shown, Fig.12 This is a flow chart of a control method of a power factor correction circuit provided by an embodiment of the present application. The control method can be applied to the above-mentioned power factor correction circuit, and may include but is not limited to step S1210, step S1220 and step S1230.

[0108] Step S1210, obtaining operating parameters of the load, and determining a target connected inductance according to the operating parameters;

[0109] Step S1220, determining a number of target switch devices from the switch module according to the target access inductance;

[0110] Step S1230, controlling the switching frequency of the power regulation module and the on-off state of the target switching device.

[0111] In one embodiment, during the operation of the power factor correction circuit, the embodiment of the present application can obtain the operating parameters of the load in real time; then determine the required target access inductance according to the operating parameters of the load, that is, the embodiment of the present application often sets different access inductance requirements in order to match different operating parameters of the load; then, according to the required target access inductance and the inductance of each inductor in the inductor module, the switching devices of the switching module are screened, thereby screening out several target switching devices; finally, the embodiment of the present application controls the switching frequency of the power regulation module, and switches the on-off state of the screened target switching devices.

[0112] It should be noted that the above-mentioned operating parameters of the load may refer to the power of the load, the current of the load, or other operating parameters. The embodiment of the present application does not specifically limit the type of the operating parameters of the load.

[0113] In addition, it should be noted that the above-mentioned target connected inductance can be determined according to the operating parameters of the load. For example, in the case of light load, since the power regulation module can be controlled to be turned off or the switching frequency of the power regulation module can be controlled to be in a low frequency state, the target connected inductance can be a large inductance; in the case of heavy load, since the switching frequency of the power regulation module needs to be controlled to be in a high frequency state, the target connected inductance can be a small inductance.

[0114] It is understandable that the number of the above-mentioned target switch devices can be one or more, and the embodiment of the present application does not specifically limit the number of target switch devices. In addition, the above-mentioned target switch devices can be all switch devices in the switch module, or can be part of the switch devices in the switch module, and the embodiment of the present application does not specifically limit this.

[0115] In addition, it should be noted that the control method of the switching frequency of the above-mentioned power regulation module can be to control the switching frequency of the power regulation module to be in a high frequency state, or to control the switching frequency of the power regulation module to be in a low frequency state or even in a closed state. The embodiment of the present application does not specifically limit the control method of the switching frequency of the power regulation module.

[0116] In addition, it should be noted that the control method for the on-off state of the above-mentioned target switching device can be switching from the on state to the off state, or from the off state to the on state. The embodiment of the present application does not specifically limit the control method for the on-off state of the target switching device.

[0117] According to the technical solution of the embodiment of the present application, since the inductor module of the embodiment of the present application is provided with multiple inductors, and switching devices are connected to both ends of several inductors, the embodiment of the present application can select a suitable target access inductance according to the operating parameters of the current load, and then select a suitable target switching device based on the target access inductance, so that the total access inductance of the inductor module can be reasonably adjusted, the current fluctuation when switching the PFC mode can be reduced, and the stability of the system can be improved; and the embodiment of the present application can also reduce the loss caused by excessive access inductance, so as to improve the efficiency of the system.

[0118] It is worth noting that since the control method of the power factor correction circuit of the embodiment of the present application corresponds to the power factor correction circuit of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the control method of the power factor correction circuit of the embodiment of the present application can refer to the specific implementation methods and technical effects of the power factor correction circuit of any of the above-mentioned embodiments.

[0119] In addition, if Fig.13 As shown, Fig.13 This is a flow chart of a control method for a power factor correction circuit provided by another embodiment of the present application. Regarding the determination of the target connected inductance according to the operating parameters in the above step S1210, it may include but is not limited to step S1310, step S1320 and step S1330.

[0120] Step S1310, obtaining the input voltage, output voltage, power factor correction efficiency, ripple current coefficient and switching frequency of the power factor correction circuit;

[0121] Step S1320, determining a duty cycle corresponding to the input voltage according to the input voltage and the output voltage;

[0122] Step S1330: determine the target connected inductance according to the operating parameters, power factor correction efficiency, input voltage, duty cycle, ripple current coefficient and switching frequency.

[0123] In one embodiment, the calculation process of the above-mentioned target connected inductance can be calculated in the following manner: first, the input voltage and the output voltage of the power factor correction circuit are input into the duty cycle calculation formula to calculate the duty cycle corresponding to the input voltage; then, the operating parameters, the power factor correction efficiency, the input voltage, the ripple current coefficient, the switching frequency and the duty cycle just calculated are input into the target connected inductance calculation formula to calculate the target connected inductance.

[0124] It is worth noting that since the above-mentioned target access inductance is often the required minimum access inductance, in this case, the above-mentioned calculation process is as follows: first, the minimum input voltage and output voltage of the power factor correction circuit are input into the duty cycle calculation formula to calculate the minimum duty cycle corresponding to the minimum input voltage; then, the operating parameters, power factor correction efficiency, minimum input voltage, ripple current coefficient, switching frequency and the minimum duty cycle just calculated are input into the target access inductance calculation formula to calculate the target access inductance, that is, the required minimum access inductance.

[0125] It should be noted that the above-mentioned input voltage and output voltage may not change with the load size, so the above-mentioned duty cycle may be a fixed value, which does not change with the load size; in addition, for the target access inductance, since it needs to be calculated through operating parameters, the target access inductance changes with the load size.

[0126] It should be noted that the switching frequency of the power regulation module and the on / off state of the target switch device in the above step S1230 may include but are not limited to: Fig.14 or Fig.15 There are two implementation scenarios, as follows:

[0127] like Fig.14 As shown, Fig.14 This is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. The above step S1230 may include but is not limited to step S1410, step S1420, step S1430 and step S1440.

[0128] Step S1410, detecting a minimum current value flowing through the inductor module;

[0129] Step S1420, adjusting the switching frequency of the power regulating module until the minimum current value is less than the first preset current value;

[0130] Step S1430, detecting the real-time current value flowing through the inductor module;

[0131] Step S1440: When the real-time current value is less than a second preset current value, switching the on-off state of the target switch device, wherein the second preset current value is greater than or equal to the first preset current value.

[0132] In one embodiment, since the inductor current cannot change suddenly, in order to reduce the disturbance of the system during the switching process during the switching period, the embodiment of the present application can first adjust the switching frequency of the power regulation module, and then switch the on-off state of the target switching device, as follows:

[0133] First, the embodiment of the present application can first detect the minimum current value flowing through the inductor module. If the minimum current value is less than the first preset current value, there is no need to adjust the switching frequency of the power regulation module; if the minimum current value is greater than or equal to the first preset current value, it is necessary to adjust the switching frequency of the power regulation module until the minimum current value is less than the first preset current value. In this way, the disturbance caused by the inductor current can be reduced as much as possible; then, the embodiment of the present application will detect the real-time current value flowing through the inductor module. If the real-time current value is less than the second preset current value, then the current flowing through the inductor module is small at this time. Therefore, switching the on-off state of the target switching device at this time can better reduce the disturbance caused by the inductor current.

[0134] It should be noted that if the real-time current value is zero, that is, switching is performed when the current passes through zero, this can better reduce the disturbance caused by the inductor current.

[0135] It can be understood that the values ​​of the first preset current value and the second preset current value can be arbitrarily set according to actual conditions, and the embodiment of the present application does not specifically limit the values ​​of the first preset current value and the second preset current value.

[0136] like Fig.15 As shown, Fig.15 This is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. The above step S1230 may include but is not limited to step S1510, step S1520 and step S1530.

[0137] Step S1510, obtaining the current connected inductance;

[0138] Step S1520, controlling the switching frequency of the power regulation module according to the current connected inductance and the target connected inductance;

[0139] Step S1530, switching the on and off state of the target switch device.

[0140] In one embodiment, the control method for the power regulation module and the target switching device can also be as follows: first, the embodiment of the present application obtains the current connected inductance of the inductor module; then, the current connected inductance and the target connected inductance are compared to obtain a comparison result; then, the switching frequency of the power regulation module is controlled according to the comparison result to match the switching frequency and the connected inductance; finally, the embodiment of the present application switches the on-off state of the target switching device.

[0141] It should be noted that the control of the switching frequency of the power regulation module according to the current connected inductance and the target connected inductance in the above step S1520 may include but is not limited to: Fig.16 or Fig.17 There are two implementation scenarios, as follows:

[0142] like Fig.16 As shown, Fig.16 This is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. The above step S1520 may include but is not limited to step S1610 and step S1620.

[0143] Step S1610: when the target connected inductance is greater than the current connected inductance;

[0144] Step S1620, keeping the switching frequency of the power regulation module unchanged.

[0145] like Fig.17 As shown, Fig.17 This is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. Regarding the above step S1520, it may include but is not limited to step S1710 and step S1720.

[0146] Step S1710: when the target connected inductance is less than or equal to the current connected inductance;

[0147] Step S1720, increasing the switching frequency of the power regulation module.

[0148] In one embodiment, if the target connected inductance is greater than the current connected inductance, then the embodiment of the present application can keep the switching frequency of the power regulation module unchanged; if the target connected inductance is less than or equal to the current connected inductance, then the embodiment of the present application needs to increase the switching frequency of the power regulation module.

[0149] Based on the hardware structure and control method of the power factor correction circuit described above, various embodiments of the identification method of the power factor correction circuit of the present application are proposed below.

[0150] like Fig.18 As shown, Fig.18 This is a flow chart of a method for identifying a power factor correction circuit provided by an embodiment of the present application. The identification method can be applied to the above-mentioned power factor correction circuit, and may include but is not limited to step S1810 and step S1820.

[0151] Step S1810, detecting a first current value flowing through the inductor module before the target switch device is switched, and a second current value flowing through the inductor module after the target switch device is switched;

[0152] Step S1820: Identify the switching result of the inductor corresponding to the target switching device according to the first current value and the second current value.

[0153] Specifically, in order to effectively improve the efficiency of the system, the embodiment of the present application adopts a method of reducing the switching frequency to reduce the switching loss during the PFC operation. At the same time, in order to reduce the loss of the PFC inductor, a combination of multiple inductors in series is adopted to adapt to different PFC switching frequencies. In the embodiment of the present application, multiple inductors are connected in series, and switching devices are connected in parallel at both ends of several inductors. The corresponding inductors are switched on and off on the line by turning on and off the switching devices. The switching of the inductors is performed online during operation, but since there is a delay in the switching of the parallel switching devices and they may be damaged, and the inductors themselves may also fail, if it is not possible to timely identify whether the switching devices have been turned on and off after the switching, whether the inductors are effectively switched from the circuit, it will greatly affect the stable and reliable operation of the system.

[0154] In this regard, the embodiment of the present application can detect the first current value flowing through the inductor module before the target switch device is switched, and the second current value flowing through the inductor module after the target switch device is switched; then, the first current value and the second current value are compared, and the switching result of the inductor corresponding to the target switch device is identified according to the comparison result. Therefore, the embodiment of the present application can quickly and accurately identify the switching of the inductor in the circuit, ensuring the subsequent stable and reliable operation of the system.

[0155] It should be noted that the switching result of identifying the inductor corresponding to the target switching device according to the first current value and the second current value in the above step S1820 may include but is not limited to: Fig.19 or Fig. 20 There are two implementation scenarios, as follows:

[0156] like Fig.19 As shown, Fig.19This is a flow chart of a method for identifying a power factor correction circuit provided by another embodiment of the present application. The above step S1820 may include but is not limited to step S1910 and step S1920.

[0157] Step S1910, when the current difference between the first current value and the second current value is greater than or equal to the preset difference;

[0158] Step S1920: Determine whether the inductor corresponding to the target switching device is switched successfully.

[0159] like Fig. 20 As shown, Fig. 20 This is a flow chart of a method for identifying a power factor correction circuit provided by another embodiment of the present application. The above step S1820 may include but is not limited to step S2010 and step S2020.

[0160] Step S2010, when the current difference between the first current value and the second current value is less than a preset difference;

[0161] Step S2020: Determine whether the inductor corresponding to the target switching device has failed to switch.

[0162] In one embodiment, if the current difference between the first current value and the second current value is greater than or equal to the preset difference, it indicates that the current change before and after the switching is large, and the embodiment of the present application can consider that the inductor switching is successful; if the current difference between the first current value and the second current value is less than the preset difference, it indicates that the current change before and after the switching is small, and the embodiment of the present application can consider that the inductor switching has failed.

[0163] It should be noted that the above-mentioned preset difference can be obtained according to the setting of the connected inductance or can be preset. The embodiment of the present application does not specifically limit the setting method of the preset difference. In the case where the preset difference is obtained according to the setting of the connected inductance, for example, if the difference between the target connected inductance and the current connected inductance is large, then the preset difference can be appropriately increased; if the difference between the target connected inductance and the current connected inductance is small, then the preset difference can be appropriately reduced.

[0164] Based on the various embodiments of the control method of the power factor correction circuit described above, an overall embodiment of the control method of the power factor correction circuit of the present application is proposed below.

[0165] like Fig.21 As shown, Fig.21 It is an overall flow chart of a control method for a power factor correction circuit provided by an embodiment of the present application, which may include but is not limited to steps S2110 to S2180.

[0166] Step S2110, calculating the required inductance according to the determined working mode;

[0167] Step S2120, determining multiple inductors and combinations according to the inductance required by the multiple modes;

[0168] Step S2130: receiving an inductor parallel switch switching instruction during operation;

[0169] Step S2140: Obtain the minimum current i of the inductor within time t L_min ;

[0170] Step S2150: Determine i L_min Is the absolute value of less than i? set1 ;

[0171] Step S2160: Obtain the real-time inductor current i L ;

[0172] Step S2170: Determine i L Is the absolute value of less than or equal to i set2 ;

[0173] Step S2180, switching the inductor parallel switch.

[0174] Specifically, the embodiment of the present application can calculate the inductance required in each mode according to the determined operating mode and system operating conditions. The calculation of the inductance is based on the formula: and Calculated (where D min is the minimum duty cycle at the lowest input voltage, V in_min is the minimum input voltage effective value, V dc is the effective value of the output voltage supplied to the load side, η is the PFC efficiency, γ is the ripple current coefficient, f is the switching frequency of PFC, P o is the PFC output power, L min is the minimum PFC inductance required under this mode and system conditions), and the required PFC inductance and the series combination of multiple inductors are determined accordingly. A switch is connected in parallel at both ends of the inductor that needs to be switched to control the switching of the corresponding inductor in the circuit. When the PFC switching frequency changes, the on and off of the switch is controlled to achieve the change of the PFC inductance following the switching frequency. Fig. 22 As shown in the figure, after the switching frequency of the PFC changes, the inductance of the inductor changes accordingly. When the duty cycle remains unchanged, the ripple change of the inductor current tends to be stable, achieving stable control of the system. Because the inductor current cannot change suddenly, in the process of switching, in order to reduce the disturbance of the system, the following measures are taken Fig.21 The control logic shown in the figure, when receiving the PFC switching frequency switching instruction, first obtains the time ( T sis the input voltage cycle) the current minimum value i flowing through the inductor L_min , when |i L_min |≥i set1 When the PFC switching frequency is adjusted, until i L_min Satisfy|i L_min |≤i set1 Conditions, such as Fig.23 As shown. Get the real-time current i flowing through the inductor L , when |i L |≤i set2 When the inductor parallel switch is turned on and off, the inductor is switched in the circuit. set1 Threshold and i set2 Threshold satisfies i set1 ≤i set2 .

[0175] The embodiment of the present application can match the appropriate PFC inductor inductance according to different PFC switching frequencies, reduce the ripple of the inductor current, effectively reduce the loss of the device, and improve the efficiency of the system. By controlling the inductor current to be switched on and off within a certain threshold, the disturbance of the system is avoided, and the stability of the system operation is effectively ensured.

[0176] Based on the various embodiments of the control method of the power factor correction circuit described above, an overall embodiment of the control method of the power factor correction circuit of the present application is proposed below.

[0177] like Fig.24 As shown, Fig.24 It is an overall flow chart of a method for identifying a power factor correction circuit provided in an embodiment of the present application, which may include but is not limited to steps S2410 to S2490.

[0178] Step S2410, receiving an inductor parallel switch switching instruction;

[0179] Step S2420, determining whether the line inductance increases after switching;

[0180] Step S2430, increasing the PFC switching frequency to f2 to match the inductor after switching;

[0181] Step S2440, maintaining the current PFC switching frequency f1;

[0182] Step S2450: Obtain the real-time inductor current i L ;

[0183] Step S2460, issuing an inductor parallel switch switching instruction;

[0184] Step S2470: Obtain the real-time inductor current i′ L ;

[0185] Step S2480: Determine L -i′ L |≥Δi set ;

[0186] Step S2490, the inductor parallel switch is switched successfully;

[0187] Specifically, active power factor correction using Boost topology usually uses a variety of different PFC switching frequency modes in practice to reduce PFC losses in different power stages and improve system efficiency. In order to better match the working mode of different PFC switching frequencies, the PFC inductor also uses a combination of multiple inductors in series, such as Figure 1 As shown in the figure, the PFC inductor has two inductors connected in series, and a switch is connected in parallel at both ends of each inductor. By controlling the on and off of the switch, the inductor is switched in the circuit. According to the calculation formula of the inductor current When the voltage, PFC switching frequency and duty cycle remain unchanged, the current in the inductor depends on the size of the inductor. Fig.25 As shown, when the inductance increases, the current in the inductor decreases, and vice versa.

[0188] In the current design, when the inductor is switched, if the switch is damaged and cannot be turned on and off normally, or there is a delay in the action of the switch, and the corresponding inductor has failure conditions such as short circuit or open circuit, after the execution of the inductor parallel switch operation, whether the inductor is normally switched from the circuit and when the switching is achieved are not identified, resulting in the system control being unable to respond to changes in the PFC inductance in a timely manner, increasing disturbances and deteriorating control.

[0189] In this regard, Fig.24 As shown, the control logic of the embodiment of the present application is as follows: when the system working mode is ready to switch, after receiving the switching instruction of the inductor parallel switch, first determine whether the inductance of the PFC inductor after switching is increased compared with the current mode. If the inductance is increased, maintain the current PFC switching frequency; if the inductance is reduced, increase the PFC switching frequency to match the state of the reduced inductance. Then obtain the current inductor current and record it as i L After that, a switching command is issued for the inductor parallel switch, and the inductor current is continuously obtained and recorded as i′ L , change i′ L with i L Compare, when satisfying |i L -i′ L |≥Δi set (Δi set When the condition of the threshold value (which is set according to the change of current under different inductances) is met, it is determined that the switch in parallel with the PFC inductor has completed the operation, and the switching of the corresponding inductor on the line is realized.

[0190] Specifically, Fig.26 As shown in the figure, when the inductance is reduced, the switching frequency of the PFC is first increased, and the current on the inductor is reduced. After the switch is switched, the inductance is reduced and the inductor current increases. In addition, as Fig. 27 As shown, when the inductance increases, the switching frequency of the PFC remains unchanged. After the switch is switched, the inductance increases and the inductor current decreases.

[0191] The embodiment of the present application can identify whether the inductor has achieved online switching based on the change in the PFC inductor current caused by the change in the inductance on the line before and after the inductor parallel switch is switched, and avoids the sharp change in the current before and after the inductor is switched by controlling the switching frequency of the PFC, thereby avoiding system disturbances and effectively ensuring the stability of the system operation.

[0192] Based on the power factor correction circuit, control method and identification method of the above-mentioned embodiments, various embodiments of the control module, power factor correction circuit, electrical equipment and computer-readable storage medium of the present application are respectively proposed below.

[0193] like Fig.28 As shown, Fig.28 1 is a schematic diagram of a control module 500 for executing a control method or identification method for a power factor correction circuit according to an embodiment of the present application. The control module 500 implemented in the present application includes: a processor 510, a memory 520, and a computer program stored in the memory 520 and executable on the processor 510, wherein: Fig.28 In the figure, a processor 510 and a memory 520 are taken as an example.

[0194] The processor 510 and the memory 520 may be connected via a bus or other means. Fig.28 The example of connecting through bus is taken in the following.

[0195] The memory 520, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 520 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 520 optionally includes a memory 520 remotely arranged relative to the processor 510, and these remote memories 520 can be connected to the control module 500 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0196] Those skilled in the art will understand that Fig.28The device structure shown in the figure does not constitute a limitation on the control module 500, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0197] exist Fig.28 In the control module 500 shown, the processor 510 can be used to call the control program or identification program stored in the memory 520, so as to implement the control method or identification method of the power factor correction circuit described above. Specifically, the non-transient software program and instructions required to implement the control method or identification method of the power factor correction circuit of the above embodiment are stored in the memory 520, and when executed by the processor 510, the control method or identification method of the power factor correction circuit of the above embodiment is executed.

[0198] It is worth noting that since the control module 500 of the embodiment of the present application can execute the control method or identification method of the power factor correction circuit of any of the above-mentioned embodiments, the specific implementation method and technical effects of the control module 500 of the embodiment of the present application can refer to the specific implementation method and technical effects of the control method or identification method of the power factor correction circuit of any of the above-mentioned embodiments.

[0199] In addition, an embodiment of the present application further provides a power factor correction circuit, which includes the control module of any of the above embodiments.

[0200] It is worth noting that since the power factor correction circuit of the embodiment of the present application includes the control module of any of the above-mentioned embodiments, and the control module of any of the above-mentioned embodiments can execute the control method or identification method of the power factor correction circuit of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the power factor correction circuit of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method or identification method of the power factor correction circuit of any of the above-mentioned embodiments.

[0201] In addition, an embodiment of the present application further provides an electrical device, which includes the power factor correction circuit of any of the above embodiments.

[0202] It is worth noting that since the electrical equipment of the embodiments of the present application includes the power factor correction circuit of any of the above-mentioned embodiments, and the power factor correction circuit of any of the above-mentioned embodiments can execute the control method or identification method of the power factor correction circuit of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the electrical equipment of the embodiments of the present application can refer to the specific implementation methods and technical effects of the power factor correction circuit and its control method or identification method of any of the above-mentioned embodiments.

[0203] It should be noted that the above-mentioned electrical equipment may be an air conditioner, a refrigerator, a washing machine, or other types of electrical equipment. The embodiments of the present application do not specifically limit the types of the above-mentioned electrical equipment.

[0204] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the control method or identification method of the power factor correction circuit described above. Figures 12 to 21 and Fig.24 The method steps in .

[0205] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the power factor correction circuit of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation manner and technical effects of the control method of the power factor correction circuit of any of the above-mentioned embodiments.

[0206] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0207] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0208] Although the implementation methods disclosed in this application are as above, the contents are only implementation methods adopted to facilitate understanding of this application, and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be defined by the attached claims.

[0209] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A power factor correction circuit, characterized in that: include: An inductor module, comprising a plurality of inductors connected in sequence; A power regulation module connected to the inductor module; A switch module, comprising a plurality of switch devices, wherein the switch devices correspond to the inductors one by one, and the switch devices are connected to two ends of the corresponding inductors; A control module is connected to the power regulating module and the switch module, the control module is used to determine the target access inductance according to the operating parameters of the load, and determine a number of target switch devices from the switch module according to the target access inductance, and the control module is also used to control the switching frequency of the power regulating module and the on-off state of the target switch device.

2. The power factor correction circuit according to claim 1, characterized in that: The power factor correction circuit also includes a current detection module, which is connected to the inductance module and the control module. The current detection module is used to detect the current value flowing through the inductance module before switching the target switching device, or to detect the current value flowing through the inductance module before and after switching the target switching device.

3. The power factor correction circuit according to claim 1, characterized in that: The power factor correction circuit also includes an energy storage module, one side of the energy storage module is connected to the power regulation module, and the other side of the energy storage module is used to be connected to the load.

4. The power factor correction circuit according to claim 1, characterized in that: The power factor correction circuit further includes a rectifier module, wherein an AC input side of the rectifier module is used to be connected to the mains, and a DC output side of the rectifier module is connected to the inductor module.

5. The power factor correction circuit according to any one of claims 1 to 4, characterized in that: The switching devices are connected to both ends of all the inductors, or the switching devices are connected to both ends of some of the inductors.

6. A control method for a power factor correction circuit, characterized in that: The power factor correction circuit includes an inductor module, a power regulating module and a switch module, wherein the inductor module includes a plurality of inductors connected in sequence, the power regulating module is connected to the inductor module, and the switch module includes a plurality of switch devices, wherein the switch devices correspond to the inductors one by one, and the switch devices are connected to the two ends of the corresponding inductors; the control method includes: Obtaining operating parameters of the load, and determining a target connected inductance according to the operating parameters; Determining a plurality of target switch devices from the switch module according to the target access inductance; Controlling the switching frequency of the power regulation module and the on / off state of the target switching device.

7. The control method according to claim 6, characterized in that: The step of determining the target connected inductance according to the operating parameters includes: Obtaining input voltage, output voltage, power factor correction efficiency, ripple current coefficient and switching frequency of the power factor correction circuit; Determine a duty cycle corresponding to the input voltage according to the input voltage and the output voltage; The target connected inductance is determined according to the operating parameters, the power factor correction efficiency, the input voltage, the duty cycle, the ripple current coefficient and the switching frequency.

8. The control method according to claim 6, characterized in that: The controlling the switching frequency of the power regulating module and the on / off state of the target switching device includes: Detecting a minimum current value flowing through the inductor module; Adjusting the switching frequency of the power regulating module until the minimum current value is less than a first preset current value; Detecting a real-time current value flowing through the inductor module; When the real-time current value is less than a second preset current value, the on-off state of the target switching device is switched, wherein the second preset current value is greater than or equal to the first preset current value.

9. The control method according to claim 6, characterized in that: The controlling the switching frequency of the power regulating module and the on / off state of the target switching device includes: Get the current connected inductance; Controlling the switching frequency of the power regulation module according to the current connected inductance and the target connected inductance; Switching the on and off state of the target switching device.

10. The control method according to claim 9, characterized in that: The controlling the switching frequency of the power regulating module according to the current connected inductance and the target connected inductance includes one of the following: When the target connected inductance is greater than the current connected inductance, keeping the switching frequency of the power regulating module unchanged; When the target connected inductance is less than or equal to the current connected inductance, the switching frequency of the power regulation module is increased.

11. A method for identifying a power factor correction circuit, characterized in that: Based on the control method of claim 8 or 9, the identification method comprises: Detecting a first current value flowing through the inductor module before the target switch device is switched, and a second current value flowing through the inductor module after the target switch device is switched; A switching result of the inductor corresponding to the target switching device is identified according to the first current value and the second current value.

12. The identification method according to claim 11, characterized in that: The step of identifying the switching result of the inductor corresponding to the target switching device according to the first current value and the second current value includes one of the following: When the current difference between the first current value and the second current value is greater than or equal to a preset difference, it is determined that the inductor corresponding to the target switching device is switched successfully; When the current difference between the first current value and the second current value is smaller than a preset difference, it is determined that the inductor corresponding to the target switching device has failed to switch.

13. A power factor correction circuit, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method as described in any one of claims 6 to 10 and / or the identification method as described in any one of claims 11 to 12 when executing the computer program.

14. An electrical device, characterized in that: It comprises a power factor correction circuit as described in any one of claims 1 to 5 or a power factor correction circuit as described in claim 13.

15. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method according to any one of claims 6 to 10 and / or the identification method according to any one of claims 11 to 12.

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