Power factor correction circuit, control method thereof and computer readable storage medium

Abstract

The invention provides a power factor correction circuit and a control method thereof, and a computer readable storage medium, the power factor correction circuit comprises an inductor module, a power regulation module, a switch module and a control module, the inductor module comprises a first inductor and a second inductor which are connected in series, the power regulation module is connected to the inductor module, and the switch module is connected to two ends of the second inductor. The control module is connected to the power adjusting module and the switch module. The second inductor can be controlled to be connected or not connected through the switch module according to the size of the load, so that the total connection inductance value of the inductor module is reasonably adjusted, the power adjusting module can be started or closed according to the size of the load, and therefore the power adjusting efficiency is improved. According to the power factor correction circuit, the working modes of the power factor correction circuit can be reasonably adjusted according to the size of the load, such as a large inductance value or small inductance value mode and a power adjustment high-frequency operation or closing mode, the inductance loss and the switching loss can be reduced on the premise of meeting power factor correction, and the system energy efficiency 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 thereof, and a computer-readable storage medium. Background Art

[0002] In the related art, PFC (Power Factor Correction) circuits are usually set for household appliances such as air conditioners or refrigerators, and inductor compensation is used to improve the power factor to ensure that the harmonics are within the required range. However, the current PFC circuits all use a single inductor, and will be automatically turned on when the power or current reaches a certain value, and basically all operate with a high-frequency carrier throughout the process.

[0003] The current PFC circuit often has the following disadvantages: First, when the load is small, the high-frequency carrier PFC circuit is still turned on, which will increase the system loss and is not conducive to improving the system energy efficiency. In addition, if a large inductance method is used to achieve a small load and the active PFC circuit is not turned on, the inductance loss will be very large under heavy load conditions. Summary of the invention

[0004] 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 thereof, and a computer-readable storage medium, which can reduce system loss and improve system energy efficiency.

[0005] In a first aspect, an embodiment of the present application provides a power factor correction circuit, including:

[0006] An inductor module, comprising a first inductor and a second inductor connected in series;

[0007] A power regulation module connected to the inductor module;

[0008] A switch module connected to two ends of the second inductor;

[0009] A control module is connected to the power regulating module and the switch module, and is used to control the working states of the switch module and the power regulating module according to the operating parameters of the load.

[0010] According to some embodiments of the present application, the power factor correction circuit also includes a current detection module, which is connected to the power regulation module and the control module, and the current detection module is used to detect the current value flowing through the power regulation module after the control module sends a first closing instruction to the switch module.

[0011] 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.

[0012] 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.

[0013] According to some embodiments of the present application, the inductance value of the first inductor is smaller than the inductance value of the second inductor.

[0014] 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 first inductor and a second inductor connected in series, the power regulation module is connected to the inductor module, and the switch module is connected to both ends of the second inductor; the control method includes:

[0015] Get the operating parameters of the load;

[0016] The operating states of the switch module and the power regulation module are controlled according to the operating parameters.

[0017] According to some embodiments of the present application, controlling the working states of the switch module and the power regulation module according to the operating parameters includes at least one of the following:

[0018] When the operating parameter is less than a preset parameter, the switch module is controlled to be disconnected, and the power regulation module is controlled to stop working;

[0019] When the operating parameter is greater than or equal to the preset parameter, the switch module is controlled to be closed, and the power regulation module is controlled to operate normally.

[0020] According to some embodiments of the present application, when the operating parameter is greater than or equal to the preset parameter, controlling the switch module to close includes:

[0021] Obtaining an input voltage of the power factor correction circuit;

[0022] When the current voltage phase of the input voltage is the target voltage phase, a second closing instruction is sent to the switch module to close the switch module, wherein the target voltage phase is determined by the closing time of the switch module.

[0023] According to some embodiments of the present application, the target voltage phase is obtained by the following steps:

[0024] Obtaining the closing time of the switch module;

[0025] The target voltage phase is determined according to a reference voltage phase and the closing time, wherein an absolute value of a phase difference between the reference voltage phase and a voltage zero-crossing point phase is less than a preset threshold.

[0026] According to some embodiments of the present application, the power factor correction circuit further includes a current detection module, and the current detection module is connected to the power regulation module; the step of obtaining the closing time of the switch module includes:

[0027] Sending a first closing instruction to the switch module and starting timing;

[0028] Controlling the power regulating module to work, and detecting the current value of the power regulating module through the current detecting module;

[0029] Determining the inductance change of the inductor module according to the current value;

[0030] When the inductance variation is greater than a preset variation, the current timing time is used as the closing time of the switch module.

[0031] According to some embodiments of the present application, the controlling the power regulating module to work, detecting the current value of the power regulating module by the current detection module, includes: controlling the power regulating module to work based on a target pulse width, detecting a first current value flowing through the power regulating module after a pulse is issued and a second current value flowing through the power regulating module before the pulse is turned off by the current detection module;

[0032] The method of determining the inductance change of the inductance module according to the current value includes: calculating the product value of the input voltage before the pulse is sent and the target pulse width, calculating the current difference between the second current value and the first current value, and taking the ratio of the product value and the current difference as the inductance change of the inductance module.

[0033] In a third 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 above when running the computer program.

[0034] In a fourth aspect, an embodiment of the present application provides an air conditioner, comprising the power factor correction circuit of the first aspect or the third aspect mentioned above.

[0035] In a fifth 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 as described in the second aspect above.

[0036] According to the technical solution of the embodiment of the present application, the following technical effects are included but not limited to: 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 first inductor and a second inductor connected in series, the power regulation module is connected to the inductor module, the switch module is connected to both ends of the second inductor, the control module is connected to the power regulation module and the switch module, and the control module is used to control the working state of the switch module and the power regulation module according to the operating parameters of the load. Since the embodiment of the present application divides the inductor module into a first inductor and a second inductor, and controls the connection of the second inductor or the non-connection of the second inductor through the switch module according to the size of the current load, the total connected inductance of the inductor module can be reasonably adjusted, and the power regulation module can also be started or shut down according to the size of the current load. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as a large inductance mode, a small inductance mode, a power regulation high-frequency operation mode or a power regulation shutdown mode, and can reduce unnecessary inductance loss and switch loss on the premise of satisfying power factor correction, thereby improving system energy efficiency.

[0037] 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

[0038] 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.

[0039] Figure 1 It is a structural diagram of a system architecture platform for executing a control method for a power factor correction circuit provided by an embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the structure of a power factor correction circuit provided by an embodiment of the present application;

[0041] Figure 3 is a structural schematic diagram of a power factor correction circuit provided by another embodiment of the present application;

[0042] Figure 4 is a flow chart of a control method of a power factor correction circuit provided by an embodiment of the present application;

[0043] Figure 5 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0044] Figure 6is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0045] Figure 7 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0046] Figure 8 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0047] Fig. 9 is a schematic diagram of a target voltage phase, a closing time, and a reference voltage phase provided by an embodiment of the present application;

[0048] Fig.10 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0049] Fig.11 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application;

[0050] Fig.12 It is an overall flow chart of a control method for a power factor correction circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In some cases, PFC circuits are usually set up for household appliances such as air conditioners or refrigerators, and inductor compensation is used to improve the power factor to ensure that the harmonics are within the required range. However, the current PFC circuits all use a single inductor, and will be automatically turned on after the power or current reaches a certain value, and basically all operate at a high-frequency carrier. For example, PFC is turned on when the circuit power is greater than 75W, and active PFC is turned on when the current reaches the set value after the air conditioner is turned on.

[0056] The current PFC circuit often has the following disadvantages: First, when the load is small, the high-frequency carrier PFC circuit is still turned on, which will increase the system loss and is not conducive to improving the system energy efficiency. In addition, if a large inductance method is used to achieve a small load and the active PFC circuit is not turned on, the inductor loss will be very large under heavy load conditions, so an ultra-large inductor may be required to achieve low loss.

[0057] Based on the above situation, the embodiments of the present application propose a power factor correction circuit and a control method thereof, and a computer-readable storage medium, which can reduce the loss of the PFC circuit under light load and heavy load conditions and improve the system energy efficiency.

[0058] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0059] like Figure 1 As shown, Figure 1 It is a schematic diagram of a system architecture platform for executing a control method for a power factor correction circuit provided by an embodiment of the present application.

[0060] The system architecture platform 100 of the embodiment of the present application includes one or more processors 110 and a memory 120. Figure 1 In the figure, a processor 110 and a memory 120 are taken as an example.

[0061] The processor 110 and the memory 120 may be connected via a bus or other means. Figure 1 The example of connecting through bus is taken in the following.

[0062] The memory 120, 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 120 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 120 may optionally include a memory 120 remotely disposed relative to the processor 110, and these remote memories may be connected to the system architecture platform 100 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.

[0063] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation on the system architecture platform 100, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0064] exist Figure 1 In the system architecture platform 100 shown, the processor 110 can be used to call the control program of the power factor correction circuit stored in the memory 120, so as to implement the control method of the power factor correction circuit.

[0065] Based on the hardware structure of the above-mentioned system architecture platform 100, various embodiments of the power factor correction circuit of the present application are proposed.

[0066] like Figure 2 and Figure 3 As shown, Figure 2 is a schematic diagram of a power factor correction circuit provided by an embodiment of the present application, Figure 3 It is a structural schematic diagram of a power factor correction circuit provided in another embodiment of the present application.

[0067] In one embodiment, the power factor correction circuit of the embodiment of the present application includes but is not limited to an inductor module 200, a power regulation module 300, a switch module 400 and a control module, wherein the inductor module 200 includes but is not limited to a first inductor L1 and a second inductor L2 connected in series, the two ends of the switch module 400 are respectively connected to the two ends of the second inductor L2, the inductor module 200 is also connected to the power regulation module 300, and the control module is respectively connected to the power regulation module 300 and the switch module 400, and is used to control the working states of the switch module 400 and the power regulation module 300 according to the operating parameters of the load.

[0068] It is worth noting that Figure 2 or Figure 3The inductance value of the first inductor L1 shown can be much smaller than the inductance value of the second inductor L2. At the same time, the second inductor L2 can be short-circuited or not short-circuited through the switch module 400 according to the size of the current load, so that a large inductance method can be used for adjustment under light load conditions, and a small inductance method can be used for adjustment under heavy load conditions.

[0069] Specifically, in the case of light load, the embodiment of the present application can control the switch module 400 to be disconnected, so that the second inductor L2 is not short-circuited. At this time, the total effective inductance of the inductor module 200 includes the first inductor L1 and the second inductor L2, that is, the inductor module 200 is switched to a large inductance mode; at the same time, the embodiment of the present application will also control the power regulation module 300 to stop working, that is, the power regulation module 300 is switched to a shutdown mode. Therefore, in the case of light load, the embodiment of the present application can achieve power factor correction and make the input current harmonics meet the standard requirements only through the first inductor L1 and the second inductor L2.

[0070] In addition, under heavy load conditions, the embodiment of the present application can control the switch module 400 to close, so that the second inductor L2 is short-circuited. At this time, the total effective inductance of the inductor module 200 only includes the first inductor L1, that is, the inductor module 200 is switched to a small inductance mode; at the same time, the embodiment of the present application will also control the power regulation module 300 to work, that is, the power regulation module 300 is switched to a high-frequency operation mode. Therefore, under heavy load conditions, the embodiment of the present application realizes high-frequency operation of the power regulation module 300 through the cooperation of the first inductor L1 and the power regulation module 300, realizes a high-frequency PFC function, thereby realizing power factor correction and making the input current harmonics meet standard requirements.

[0071] In addition, it is worth noting that the reason why the embodiment of the present application uses two inductors is that the magnetic core material of low-loss material needs to be in a large volume to produce an inductor with large inductance. In other words, it is difficult to achieve a large inductance with a low-loss material core. When the circuit operates under a light load, such as less than 2000W, the embodiment of the present application can achieve power factor correction power and make the input current harmonics meet the standard requirements by virtue of the large inductance. Therefore, when the power factor correction circuit operates under a light load, since the switch tube in the power regulation module 300 is not working, no switching loss is generated, thereby improving the working efficiency of the power factor correction circuit under light load conditions.

[0072] Since the embodiment of the present application divides the inductor module 200 into a first inductor L1 and a second inductor L2, and controls the connection of the second inductor L2 or the non-connection of the second inductor L2 through the switch module 400 according to the size of the current load, the total connected inductance of the inductor module 200 can be reasonably adjusted, and the power regulation module 300 can also be started or shut down according to the size of the current load. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as a large inductance mode, a small inductance mode, a power regulation high-frequency operation mode or a power regulation shutdown mode, and can reduce unnecessary inductance loss and switching loss while satisfying the power factor correction, thereby improving the system energy efficiency.

[0073] It should be noted that, for the series connection sequence of the first inductor L1 and the second inductor L2 in the inductor module 200 of the embodiment of the present application, the first inductor L1 can be connected to the power regulation module 300 through the second inductor L2, or the second inductor L2 can be connected to the power regulation module 300 through the first inductor L1. The embodiment of the present application does not specifically limit the series connection sequence of the first inductor L1 and the second inductor L2 in the inductor module 200.

[0074] In addition, it should be noted that, for the connection method of the switch module 400 and the second inductor L2 in the inductor module 200, the switch module 400 can be directly connected in parallel with the second inductor L2, that is, the two ends of the switch module 400 are directly connected to the two ends of the second inductor L2 respectively; or the second inductor L2 and other components such as a resistor are connected in series and then connected to the switch module 400, that is, at least one end of the switch module 400 is indirectly connected to the second inductor L2 through a resistor; the embodiment of the present application does not specifically limit the connection method of the switch module 400 and the second inductor L2 in the inductor module 200.

[0075] In addition, it should be noted that the structural type of the above-mentioned switch module 400 can be a relay, a switch 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 switch module 400.

[0076] 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.

[0077] For example, when an electromagnetic relay is used as the switch module 400, 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 second inductor L2, and control the suction force generated by the current of the input circuit between the electromagnet core and the armature to control the on and off of the output circuit, thereby short-circuiting the second inductor L2 or not short-circuiting the second inductor L2.

[0078] 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.

[0079] For example, when an NPN transistor is used as the switch module 400, the embodiment of the present application can connect the collector and emitter of the NPN transistor to the two ends of the second inductor L2 respectively, and then control the current between the collector and the emitter by controlling the voltage of the base of the NPN transistor, thereby realizing the on-off between the collector and the emitter, thereby short-circuiting the second inductor L2 or not short-circuiting the second inductor L2.

[0080] In addition, it should be noted that the power adjustment module 300 described above can be Figure 2 As shown, a switch tube is included, which can also be Figure 3 As shown, multiple switch tubes are included. The embodiment of the present application does not specifically limit the number of switch tubes in the power regulation module 300.

[0081] In addition, it should be noted that the above control module may include but is not limited to Figure 1 The processor and memory shown in the figure, wherein the processor can be connected to the power regulation module 300 and the switch module 400 respectively, so as to control the switching state of the switch tube in the power regulation module 300, and can control the on-off state of the switch module 400.

[0082] 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 500, which is connected to the power regulation module 300 and the control module, wherein the current detection module 500 is used to detect the current value flowing through the power regulation module 300 after the control module sends a first closing command to the switch module 400.

[0083] It should be noted that since the closing time of the switch module 400 may be affected by factors such as ambient temperature and aging, problems such as time extension or time shortening may occur. In this regard, the embodiment of the present application can remeasure the closing time of the switch module 400 each time the power factor correction circuit is powered on.

[0084] Specifically, the embodiment of the present application can use the current detection module 500 to assist in measuring the closing time of the switch module 400. First, after the power factor correction circuit is powered on, the embodiment of the present application can send a first closing instruction to the switch module 400 through the control module, and turn on the power regulation module 300, and then use the current detection module 500 to detect the current value flowing through the power regulation module 300, and calculate the inductance change through the current value. If the inductance change is large, it indicates that the switch module 400 has been completely closed and short-circuited the second inductor L2. Then, the embodiment of the present application can use the time corresponding to the time when the first closing instruction is sent and the time corresponding to the time when the current value changes significantly as the closing time of the switch module 400.

[0085] It is worth noting that the embodiment of the present application can obtain the real-time closing time of the switch module 400 by controlling the switch module 400 to close once after the power factor correction circuit is powered on. The purpose of obtaining the closing time is to ensure that the switching time point of the power factor correction circuit from light load to heavy load is at or near the input voltage zero crossing point, when the input voltage is low or zero, so switching from large inductance to small inductance will not cause impact on the circuit, and the embodiment of the present application can easily start the high-frequency PFC at or near the input voltage zero crossing point.

[0086] It is understandable that the above-mentioned current detection module 500 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 500.

[0087] 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 600, one side of the energy storage module 600 is connected to the power regulation module 300, and the other side is used to connect to the load.

[0088] Specifically, the embodiment of the present application can control the charging and discharging of the inductor module 200 and the energy storage module 600 by controlling the power regulation module 300. For example, Figure 2 As shown, when the control module outputs a high level to the gate of the switch tube Q1, the drain and source of the switch tube Q1 are connected, and the current of the mains will flow through the inductor module 200 and the switch tube Q1, thereby charging the inductor module 200; when the control module outputs a low level to the gate of the switch tube Q1, the drain and source of the switch tube Q1 are disconnected, and the current of the mains will flow through the inductor module 200 and the energy storage module 600, thereby charging the energy storage module 600, and the voltage across the energy storage module 600 is the voltage supplied to the load.

[0089] It is understandable that the above-mentioned energy storage module 600 may include capacitors, capacitors and resistors, or other energy storage devices. The embodiment of the present application does not specifically limit the structure of the energy storage module 600.

[0090] In one embodiment, the power factor correction circuit of the embodiment of the present application also includes but is not limited to a rectifier module 700 , wherein the AC input side of the rectifier module 700 is used to connect to the mains, and the DC output side of the rectifier module 700 is connected to the inductor module 200 .

[0091] Specifically, Figure 2 As shown, the embodiment of the present application can rectify the AC mains power through the rectifier module 700 to output DC power.

[0092] 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.

[0093] Based on the above system architecture platform and the hardware structure of the power factor correction circuit, various embodiments of the control method of the power factor correction circuit of the present application are proposed below.

[0094] like Figure 4 As shown, Figure 4 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 S100 and step S200.

[0095] Step S100, obtaining operating parameters of the load;

[0096] Step S200: Control the working states of the switch module and the power regulation module according to the operating parameters.

[0097] In one embodiment, during operation, the power factor correction circuit can obtain the operating parameters of the load in real time, then determine the current load size based on the load operating parameters, and then control the on / off state of the switch module and the switching state of the power regulation module based on the load size.

[0098] 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.

[0099] In addition, it can be understood that the working state of the above-mentioned switch module can be a closed state or an open state.

[0100] In addition, it can be understood that the working state of the above-mentioned power regulation module can be a running state or a stopped running state.

[0101] Since the embodiment of the present application can control the connection of the second inductor or non-connection of the second inductor through the switch module according to the size of the current load, the total connected inductance of the inductor module can be reasonably adjusted, and the power regulation module can be started or shut down according to the size of the current load. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as the large inductance mode, the small inductance mode, the power regulation high-frequency operation mode or the power regulation off mode, and can reduce unnecessary inductance loss and switching loss while meeting the power factor correction, thereby improving the system energy efficiency.

[0102] 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.

[0103] It should be noted that the control of the working state of the switch module and the power regulation module according to the operating parameters in the above step S200 may include but is not limited to: Figure 5 or Figure 6 There are two implementation scenarios, as follows:

[0104] like Figure 5 As shown, Figure 5 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 S200 may include but is not limited to step S310 and step S320.

[0105] Step S310: When the operating parameter is less than the preset parameter;

[0106] Step S320: Control the switch module to be disconnected, and control the power regulation module to stop working.

[0107] In one embodiment, if the operating parameter is less than the preset parameter, for example, the load power is less than the preset power or the load current is less than the preset current, then it can be considered that the current load is small, that is, the current state is a light load. Specifically, in the case of a light load, the embodiment of the present application can control the switch module to disconnect so that the second inductor is not short-circuited. At this time, the total effective inductance of the inductor module includes the first inductor and the second inductor, that is, the inductor module is switched to a large inductance mode; at the same time, the embodiment of the present application will also control the power regulation module to stop working, that is, switch the power regulation module to an off mode. Therefore, in the case of a light load, the embodiment of the present application can achieve power factor correction and make the input current harmonics meet the standard requirements only through the first inductor and the second inductor.

[0108] It can be understood that the above-mentioned preset parameters can be pre-set, and the embodiment of the present application does not specifically limit the numerical value of the preset parameters.

[0109] like Figure 6 As shown, Figure 6 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 S200 may include but is not limited to step S410 and step S420.

[0110] Step S410: When the operating parameter is greater than or equal to the preset parameter;

[0111] Step S420: Control the switch module to close, and control the power regulation module to work normally.

[0112] In one embodiment, if the operating parameter is greater than or equal to the preset parameter, for example, the load power is greater than or equal to the preset power or the load current is greater than or equal to the preset current, then it can be considered that the current load is large, that is, the current state is heavy load. Specifically, in the case of heavy load, the embodiment of the present application can control the switch module to close, so that the second inductor is short-circuited. At this time, the total effective inductance of the inductor module only includes the first inductor, that is, the inductor module is switched to a small inductance mode; at the same time, the embodiment of the present application will also control the power regulation module to work, that is, the power regulation module is switched to a high-frequency operation mode. Therefore, in the case of heavy load, the embodiment of the present application realizes high-frequency operation of the power regulation module through the cooperation of the first inductor and the power regulation module, realizes the high-frequency PFC function, thereby realizing power factor correction and making the input current harmonics meet the standard requirements.

[0113] It can be understood that the above-mentioned preset parameters can be pre-set, and the embodiment of the present application does not specifically limit the numerical value of the preset parameters.

[0114] In addition, if Figure 7 As shown, Figure 7This is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. Regarding the control of the switch module to close in the above step S420, it may include but is not limited to step S510 and step S520.

[0115] Step S510, obtaining the input voltage of the power factor correction circuit;

[0116] Step S520: When the current voltage phase of the input voltage is the target voltage phase, a second closing instruction is sent to the switch module to close the switch module, wherein the target voltage phase is determined by the closing time of the switch module.

[0117] In addition, if Figure 8 As shown, Figure 8 1 is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. The step of obtaining the target voltage phase may include but is not limited to step S610 and step S620.

[0118] Step S610, obtaining the closing time of the switch module;

[0119] Step S620: determining a target voltage phase according to a reference voltage phase and a closing time, wherein an absolute value of a phase difference between the reference voltage phase and a voltage zero-crossing phase is less than a preset threshold.

[0120] In one embodiment, if Figure 7 and Figure 8 As shown, it should be noted that since the closing time of the switch module may be affected by factors such as ambient temperature and aging, problems such as time extension or time shortening may occur. In this regard, the embodiment of the present application can remeasure the closing time of the switch module each time the power factor correction circuit is powered on.

[0121] It is worth noting that the purpose of obtaining the closing time is to ensure that the switching time point when the power factor correction circuit switches from light load to heavy load is at or near the input voltage zero crossing point. At this time, the input voltage is low or the input voltage is zero, so switching from large inductance to small inductance will not cause impact on the circuit, and at this time, the high-frequency PFC can be easily started from or near the zero crossing point.

[0122] Specifically, after obtaining the closing time of the switch module, in order to ensure that the moment when the switch module is completely closed after the control module issues a closing instruction is just at or near the zero crossing point of the input voltage, the embodiment of the present application Fig. 9As shown, point A is the voltage zero-crossing point, point B is the point corresponding to the target voltage phase, and tc is the closing time of the relay. The embodiment of the present application can calculate the target voltage phase point B based on the phase at or near the voltage zero-crossing point A and the obtained closing time tc. In other words, if a closing instruction is sent to the switch module when the phase of the input voltage is the target voltage phase point B, the switch module will be completely closed at or near the voltage zero-crossing point A and short-circuit the second inductor, so that the circuit will not be impacted by the sudden change in inductance.

[0123] It should be noted that the above-mentioned reference voltage phase may be a phase corresponding to the voltage zero-crossing point, or a phase corresponding to the vicinity of the voltage zero-crossing point.

[0124] In addition, it should be noted that the above-mentioned preset threshold may be pre-set, and the embodiment of the present application does not specifically limit the numerical value of the preset threshold.

[0125] In addition, if Fig.10 As shown, Fig.10 This is a flow chart of a control method of a power factor correction circuit provided by another embodiment of the present application. The acquisition of the closing time of the switch module in the above step S610 may include but is not limited to step S710, step S720, step S730 and step S740.

[0126] Step S710, sending a first closing instruction to the switch module and starting timing;

[0127] Step S720, controlling the power regulating module to work, and detecting the current value of the power regulating module through the current detecting module;

[0128] Step S730, determining the inductance change of the inductor module according to the current value;

[0129] Step S740: When the inductance variation is greater than the preset variation, the current timing time is used as the closing time of the switch module.

[0130] In one embodiment, specifically, the embodiment of the present application can use a current detection module to assist in measuring the closing time of the switch module. First, after the power factor correction circuit is powered on, the embodiment of the present application can send a first closing instruction to the switch module through the control module, and turn on the power regulation module, and then use the current detection module to detect the current value flowing through the power regulation module, and calculate the inductance change through the current value. If the inductance change is large, it indicates that the switch module has been completely closed and short-circuited the second inductor. Then, the embodiment of the present application can use the time corresponding to the time when the first closing instruction is sent and the time corresponding to the time when the current value changes significantly as the closing time of the switch module.

[0131] It is worth noting that in addition to Fig.10 The steps shown obtain the real-time closing time of the switch module, and can also obtain the closing time that is preset or measured last time. Specifically, if the closing time of the switch module is greatly affected by factors such as ambient temperature and time aging, the embodiment of the present application can obtain the real-time closing time of the switch module by controlling the switch module to close once after the power factor correction circuit is powered on. If the closing time of the switch module is less affected by factors such as ambient temperature and time aging, the embodiment of the present application can use the closing time set at the factory or the closing time measured historically.

[0132] In addition, it should be noted that the above-mentioned preset change amount can be determined according to the inductance of the second inductor, and the embodiment of the present application does not specifically limit the numerical value of the preset change amount.

[0133] In addition, if Fig.11 As shown, Fig.11 It 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-mentioned step S720 and step S730, it may include but is not limited to step S810, step S820, step S830, step S840 and step S850.

[0134] Step S810, controlling the power regulation module to operate based on the target pulse width;

[0135] Step S820, detecting, by the current detection module, a first current value flowing through the power regulation module after the pulse is emitted and a second current value flowing through the power regulation module before the pulse is turned off;

[0136] Step S830, calculating the product value of the input voltage before the pulse is sent and the target pulse width;

[0137] Step S840, calculating the current difference between the second current value and the first current value;

[0138] Step S850: taking the ratio of the product value and the current difference as the inductance variation of the inductor module.

[0139] In one embodiment, after power-on and before formal operation, the embodiment of the present application can control the power regulation module to continuously perform switching actions according to a given target pulse width, wherein the target pulse width is the pulse time ton; at the same time, the input voltage Uin of the AC power just before the pulse is emitted is obtained; then, the first current value Ia flowing through the power regulation module after the pulse is emitted is detected by the current detection module, and the second current value Ib flowing through the power regulation module before the pulse is closed is detected by the current detection module; then, the product value of the input voltage Uin before the pulse is emitted and the target pulse width ton and the current difference between the second current value Ib and the first current value Ia are calculated; finally, the ratio of the product value and the current difference is used as the inductance change of the inductance module.

[0140] It should be noted that the above-mentioned target pulse width may be pre-set, and the embodiment of the present application does not specifically limit the numerical value of the target pulse width.

[0141] 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.

[0142] like Fig.12 As shown, Fig.12 It is an overall flow chart of a control method of a power factor correction circuit provided by an embodiment of the present application, which may include but is not limited to steps S901 to S915.

[0143] Step S901, power on;

[0144] Step S902, the processor controls the relay K1 to close;

[0145] Step S903, the timer starts timing;

[0146] Step S904, the switch tube Q1 continuously outputs pulses with a fixed pulse width;

[0147] Step S905, obtaining the current value from the current detection module and calculating the inductance;

[0148] Step S906: Detect that the inductance change is greater than ΔL;

[0149] Step S907, the timer stops timing and records the timing duration tc;

[0150] Step S908, calculating the input voltage phase when the relay K1 is closed;

[0151] Step S909, disconnect the relay K1;

[0152] Step S910, the program enters normal operation;

[0153] Step S911, determine whether the load power is less than the set value Pe, if not, execute step S912, if yes, execute step S913;

[0154] Step S912, relay K1 disconnection control;

[0155] Step S913, waiting for the input voltage phase to reach the relay closing phase value;

[0156] Step S914, closing relay K1;

[0157] Step S915: normal operation.

[0158] Specifically, after the electronic control is powered on, the control module controls the relay K1 to close, and then the internal timer starts timing. After waiting for a period of time or not waiting, the switch tube Q1 starts to continuously switch with a fixed pulse width (pulse time ton), wherein the AC input voltage value Uin is obtained just before the pulse is sent, and the control module obtains the current value Ia from the current detection module after the pulse is sent, and obtains the current value Ib before the pulse is closed. The inductance of the inductance in the circuit can be calculated by the following formula L = (Uin*ton) / (Ib-Ia).

[0159] When the inductance change value is detected to be greater than ΔL (because the current change will cause the inductance to change, it is necessary to set a reasonable difference, and in fact, the difference between the inductance of the two inductors is also very large, generally L2>3L1), the timer stops timing and records the timing time tc, which is the closing time of the relay (because the closing time will be affected by factors such as ambient temperature and time aging, it is necessary to re-measure after each power-on), and it is calculated that the relay closing moment is exactly at the zero crossing point. The input voltage phase θ required for the relay control to close. Then the control module controls the relay to disconnect and enter the normal operating state. When it is detected that the load power is greater than the set value Pe, the control relay closes the relay at the input voltage phase θ. Finally, the circuit enters the high-power operation stage.

[0160] Based on the power factor correction circuit and control method thereof of the above-mentioned various embodiments, various embodiments of the control module, power factor correction circuit, air conditioner and computer-readable storage medium of the present application are respectively proposed below.

[0161] In addition, an embodiment of the present application provides a control module, which includes: a processor, a memory, and a computer program stored in the memory and executable on the processor.

[0162] The processor and the memory may be connected via a bus or other means.

[0163] It should be noted that the control module in this embodiment may include: Figure 1The processor and memory in the illustrated embodiment both belong to the same inventive concept, and therefore both have the same implementation principles and beneficial effects, which will not be described in detail here.

[0164] The non-transient software program and instructions required to implement the control method of the power factor correction circuit of the above embodiment are stored in the memory, and when executed by the processor, the control method of the power factor correction circuit of the above embodiment is executed.

[0165] According to the technical solution of the control module of the embodiment of the present application, since the embodiment of the present application divides the inductance module into the first inductance and the second inductance, and controls the connection of the second inductance or the non-connection of the second inductance through the switch module according to the size of the current load, the total connected inductance of the inductance module can be reasonably adjusted, and the power regulation module can also be started or shut down according to the size of the current load. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as the large inductance mode, the small inductance mode, the power regulation high-frequency operation mode or the power regulation shutdown mode, and can reduce unnecessary inductance loss and switching loss under the premise of satisfying power factor correction, and improve system energy efficiency. In addition, the embodiment of the present application can also use timing and other methods to infer the closing time of the switch module, and control the closing time of the switch module to be exactly at or near the voltage zero crossing, thereby reducing the influence of the inductance switching on the circuit operation.

[0166] It is worth noting that since the control module 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 methods and technical effects of the control module of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the power factor correction circuit of any of the above-mentioned embodiments.

[0167] 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.

[0168] According to the technical solution of the power factor correction circuit of the embodiment of the present application, since the embodiment of the present application divides the inductor module into a first inductor and a second inductor, and controls the connection of the second inductor or the non-connection of the second inductor through the switch module according to the size of the current load, the total connected inductance of the inductor module can be reasonably adjusted, and the power regulation module can also be started or shut down according to the size of the current load. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as a large inductance mode, a small inductance mode, a power regulation high-frequency operation mode or a power regulation shutdown mode, and can reduce unnecessary inductance loss and switching loss under the premise of satisfying power factor correction, thereby improving system energy efficiency. In addition, the embodiment of the present application can also use timing and other methods to infer the closing time of the switch module, and control the closing time of the switch module to be exactly at or near the voltage zero crossing, thereby reducing the influence of the inductor switching on the circuit operation.

[0169] 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 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 of the power factor correction circuit of any of the above-mentioned embodiments.

[0170] In addition, an embodiment of the present application further provides an air conditioner, which includes the power factor correction circuit of any of the above embodiments.

[0171] According to the technical solution of the air conditioner of the embodiment of the present application, since the embodiment of the present application divides the inductor module into the first inductor and the second inductor, and controls the connection of the second inductor or the non-connection of the second inductor through the switch module according to the current load size, the total connected inductance of the inductor module can be reasonably adjusted, and the power regulation module can also be started or shut down according to the current load size. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as the large inductance mode, the small inductance mode, the power regulation high-frequency operation mode or the power regulation shutdown mode, and can reduce unnecessary inductance loss and switching loss under the premise of meeting the power factor correction, and improve the system energy efficiency. In addition, the embodiment of the present application can also use timing and other methods to infer the closing time of the switch module, and control the closing time of the switch module to be exactly at or near the voltage zero crossing, so as to reduce the influence of the inductor switching on the circuit operation.

[0172] It is worth noting that since the air conditioner of the embodiment 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 of the power factor correction circuit of any of the above-mentioned embodiments, therefore, the specific implementation methods and technical effects of the air conditioner of the embodiment of the present application can refer to the specific implementation methods and technical effects of the power factor correction circuit and its control method of any of the above-mentioned embodiments.

[0173] 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 of the power factor correction circuit described above. Figures 4 to 8 , Figures 10 to 12 The method steps in .

[0174] According to the technical solution of the computer-readable storage medium of the embodiment of the present application, since the embodiment of the present application divides the inductance module into the first inductance and the second inductance, and controls the connection of the second inductance or the non-connection of the second inductance through the switch module according to the size of the current load, the total connected inductance of the inductance module can be reasonably adjusted, and the power regulation module can also be started or shut down according to the size of the current load. Therefore, the embodiment of the present application can reasonably adjust the working mode of the power factor correction circuit according to the load size, such as the large inductance mode, the small inductance mode, the power regulation high-frequency operation mode or the power regulation shutdown mode, and can reduce unnecessary inductance loss and switching loss under the premise of satisfying the power factor correction, and improve the system energy efficiency. In addition, the embodiment of the present application can also use timing and other methods to infer the closing time of the switch module, and control the closing time of the switch module to be exactly at or near the voltage zero crossing, so as to reduce the influence of the inductance switching on the circuit operation.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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 first inductor and a second inductor connected in series; A power regulation module connected to the inductor module; A switch module connected to two ends of the second inductor; A control module is connected to the power regulating module and the switch module, and is used to control the working states of the switch module and the power regulating module according to the operating parameters of the load.

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 power regulation module and the control module. The current detection module is used to detect the current value flowing through the power regulation module after the control module sends a first closing instruction to the switch module.

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 inductance value of the first inductor is smaller than the inductance value of the second inductor.

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, the inductor module includes a first inductor and a second inductor connected in series, the power regulating module is connected to the inductor module, and the switch module is connected to both ends of the second inductor; the control method includes: Get the operating parameters of the load; The operating states of the switch module and the power regulation module are controlled according to the operating parameters.

7. The control method according to claim 6, characterized in that: The controlling the working states of the switch module and the power regulation module according to the operating parameters includes at least one of the following: When the operating parameter is less than a preset parameter, the switch module is controlled to be disconnected, and the power regulation module is controlled to stop working; When the operating parameter is greater than or equal to the preset parameter, the switch module is controlled to be closed, and the power regulation module is controlled to operate normally.

8. The control method according to claim 7, characterized in that: When the operating parameter is greater than or equal to the preset parameter, controlling the switch module to close includes: Obtaining an input voltage of the power factor correction circuit; When the current voltage phase of the input voltage is the target voltage phase, a second closing instruction is sent to the switch module to close the switch module, wherein the target voltage phase is determined by the closing time of the switch module.

9. The control method according to claim 8, characterized in that: The target voltage phase is obtained by the following steps: Obtaining the closing time of the switch module; The target voltage phase is determined according to a reference voltage phase and the closing time, wherein an absolute value of a phase difference between the reference voltage phase and a voltage zero-crossing point phase is less than a preset threshold.

10. The control method according to claim 9, characterized in that: The power factor correction circuit further includes a current detection module, and the current detection module is connected to the power regulation module; the step of obtaining the closing time of the switch module includes: Sending a first closing instruction to the switch module and starting timing; Controlling the power regulating module to work, and detecting the current value of the power regulating module through the current detecting module; Determining the inductance change of the inductor module according to the current value; When the inductance variation is greater than a preset variation, the current timing time is used as the closing time of the switch module.

11. The control method according to claim 10, characterized in that: The controlling the power regulating module to work, detecting the current value of the power regulating module by the current detection module, comprises: controlling the power regulating module to work based on the target pulse width, detecting the first current value flowing through the power regulating module after the pulse is issued and the second current value flowing through the power regulating module before the pulse is turned off by the current detection module; The method of determining the inductance change of the inductance module according to the current value includes: calculating the product value of the input voltage before the pulse is sent and the target pulse width, calculating the current difference between the second current value and the first current value, and taking the ratio of the product value and the current difference as the inductance change of the inductance module.

12. 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 according to any one of claims 6 to 11 when executing the computer program.

13. An air conditioner, characterized in that: It comprises the power factor correction circuit as described in any one of claims 1 to 5 or the power factor correction circuit as described in claim 12.

14. 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 11.

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