Air conditioner and control method thereof, storage medium and controller

Abstract

The invention discloses an air conditioner and a control method thereof, a storage medium and a controller, the air conditioner comprises a power factor correction circuit and a capacitor connected with the output end of the power factor correction circuit in parallel, and the control method comprises the steps that the ripple current of the capacitor is acquired, and the center temperature rise of the capacitor is obtained according to the ripple current and the ESR curve of the capacitor; acquiring an outdoor environment temperature, and calculating a capacitor center temperature according to the outdoor environment temperature and the capacitor center temperature rise; and the capacitor center temperature is compared with a preset temperature, and the power factor correction circuit is controlled according to a comparison result. According to the method, the heating condition of the capacitor is detected through the ripple current of the capacitor, and the working mode of the power factor correction circuit is controlled according to the heating condition, so that the capacitance margin during the design of the air conditioner can be reduced, and compared with a scheme of detecting the heating of the capacitor by using a temperature testing instrument, the hardware cost is reduced, and the size of the air conditioner is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a control method thereof, a storage medium and a controller. Background Art

[0002] At present, most of the DC bus capacitors in variable frequency air conditioner electronic controls have no overheating protection control. A small number of them use temperature testing instruments to detect the heating of the DC bus capacitors, and then feed back to the MCU (Micro-Controller Unit) for control.

[0003] Among them, without overheat protection control, if the load is heavy, the capacitor will heat up seriously, shortening the service life of the capacitor; for this reason, the related technology uses capacitors with larger margins to ensure operation, but this will increase costs. At the same time, using temperature testing instruments to detect the heating of capacitors for control will increase costs and increase the size of the electronic control. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the purpose of the present invention is to provide an air conditioner and a control method thereof, a storage medium and a controller to reduce the capacitance margin when designing the air conditioner, reduce the hardware cost and reduce the size of the air conditioner.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present invention proposes a control method for an air conditioner, wherein the air conditioner includes a power factor correction circuit and a capacitor connected in parallel with the output end of the power factor correction circuit, and the control method includes: obtaining the ripple current of the capacitor, and obtaining the center temperature rise of the capacitor based on the ripple current and the ESR curve of the capacitor; obtaining the outdoor ambient temperature, and calculating the center temperature of the capacitor based on the outdoor ambient temperature and the center temperature rise of the capacitor; comparing the center temperature of the capacitor with a preset temperature, and controlling the power factor correction circuit according to the comparison result.

[0006] In addition, the control method of the air conditioner in the above embodiment of the present invention may also have the following additional technical features:

[0007] According to one embodiment of the present invention, the power factor correction circuit includes a first switch tube and a second switch tube connected in parallel, and the power factor correction circuit is controlled according to the comparison result, including: if the center temperature of the capacitor is less than or equal to the preset temperature, the power factor correction circuit is controlled to enter a first operating mode, wherein the first operating mode is that the first switch tube is intermittently turned on and the second switch tube is continuously turned off, or that the second switch tube is intermittently turned on and the first switch tube is continuously turned off; if the center temperature of the capacitor is greater than the preset temperature, the power factor correction circuit is controlled to enter a second operating mode, and the second operating mode is that the first switch tube and the second switch tube are alternately turned on.

[0008] According to an embodiment of the present invention, obtaining the ripple current of the capacitor includes: obtaining an input current and an output current of the power factor correction circuit, and calculating the ripple current of the capacitor based on the input current and the output current.

[0009] According to an embodiment of the present invention, obtaining the ripple current of the capacitor includes: obtaining the ripple current of the capacitor through a first sampling resistor connected in series with the capacitor.

[0010] According to one embodiment of the present invention, calculating the capacitor center temperature based on the outdoor ambient temperature and the capacitor center temperature rise includes: calculating the product of the outdoor ambient temperature and the ambient temperature coefficient, and taking the sum of the product and the capacitor center temperature rise as the capacitor center temperature.

[0011] According to one embodiment of the present invention, the control method also includes: recording the duration after the power factor correction circuit enters the second working mode; when the duration reaches a preset time, comparing the current capacitor center temperature with the preset temperature; if the current capacitor center temperature is greater than the preset temperature, controlling the air conditioner to shut down; if the current capacitor center temperature is less than or equal to the preset temperature, controlling the power factor correction circuit to enter the first working mode.

[0012] To achieve the above object, a second aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned air conditioner control method is implemented.

[0013] To achieve the above objectives, a third aspect of the present invention provides a controller, comprising a memory, a processor and a computer program stored in the memory, wherein when the computer program is executed by the processor, the above air conditioner control method is implemented.

[0014] To achieve the above-mentioned object, a fourth aspect of the present invention provides an air conditioner, comprising: a power factor correction circuit and a capacitor connected in parallel with the output end of the power factor correction circuit, and the above-mentioned controller.

[0015] In addition, the air conditioner of the above embodiment of the present invention may also have the following additional technical features:

[0016] According to one embodiment of the present invention, the power factor correction circuit includes a first switch tube and a second switch tube connected in parallel, and the controller is used to: when the center temperature of the capacitor is less than or equal to the preset temperature, control the power factor correction circuit to enter a first operating mode, wherein the first operating mode is that the first switch tube is intermittently turned on and the second switch tube is continuously turned off, or that the second switch tube is intermittently turned on and the first switch tube is continuously turned off; when the center temperature of the capacitor is greater than the preset temperature, control the power factor correction circuit to enter a second operating mode, and the second operating mode is that the first switch tube and the second switch tube are alternately turned on.

[0017] The air conditioner and its control method, storage medium and controller of the embodiment of the present invention detect the heating condition of the capacitor through the ripple current of the capacitor, and control the working mode of the power factor correction circuit according to the heating condition, thereby reducing the capacitor margin when designing the air conditioner. Compared with the solution of using a temperature testing instrument to detect the heating of the capacitor, the hardware cost is reduced and the size of the air conditioner is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0019] Figure 2 is a structural block diagram of an air conditioner according to a first embodiment of the present invention;

[0020] Figure 3 is an ESR curve diagram of a capacitor according to an embodiment of the present invention;

[0021] Figure 4 is a topological diagram of an air conditioner circuit according to an embodiment of the present invention;

[0022] Figure 5 is a structural block diagram of an air conditioner according to a second embodiment of the present invention;

[0023] Figure 6 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0024] Figure 7 is a waveform diagram of an operating mode of a power factor correction circuit according to an embodiment of the present invention;

[0025] Figure 8 is a flow chart of a method for controlling an air conditioner according to a second embodiment of the present invention;

[0026] Fig. 9 is a structural block diagram of a controller according to an embodiment of the present invention;

[0027] Fig.10 It is a structural block diagram of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The air conditioner and its control method, storage medium and controller according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0030] Figure 1 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention.

[0031] See also Figure 2 The air conditioner includes a power factor correction circuit and a capacitor C1 connected in parallel with the output end of the power factor correction circuit. Figure 1 As shown, the control method includes:

[0032] S11, obtaining the ripple current of the capacitor, and obtaining the center temperature rise of the capacitor according to the ripple current and the ESR curve of the capacitor.

[0033] Specifically, the ripple current of the capacitor can be obtained through the sampling resistor connected in series with the capacitor C1, and the input current of the power factor correction circuit can also be obtained (which can be obtained through Figure 2 The sampling resistor R1 shown in the figure is used to obtain the input current and the output current, and the ripple current of the capacitor is calculated based on the input current and the output current. The equivalent series resistance (ESR) curve of the capacitor is shown in Figure 3 As shown, the equivalent series resistance (ESR) of the capacitor at the corresponding frequency can be obtained according to the ESR curve of the capacitor. The temperature rise at the center of the capacitor is recorded as ΔT, which can be calculated by the following formula:

[0034]

[0035] Among them, I C-RMS is the ripple current of the capacitor, A is the surface area of ​​the capacitor (cm 3 ), H is the capacitance heat dissipation coefficient (W / cm 3 *℃).

[0036] S12, obtaining the outdoor ambient temperature, and calculating the capacitor center temperature according to the outdoor ambient temperature and the capacitor center temperature rise.

[0037] Specifically, the outdoor ambient temperature can be collected by an ambient temperature sensor installed in the outdoor unit. Figure 2 As shown, the sampling and control circuit includes an ambient temperature sampling circuit, which is connected to the ambient temperature sensor to obtain the outdoor ambient temperature signal input by the ambient temperature sensor. The PFC control circuit calculates the capacitor center temperature Tc according to the outdoor ambient temperature Te and the calculated capacitor center temperature rise ΔT.

[0038] S13, comparing the center temperature of the capacitor with a preset temperature, and controlling the power factor correction circuit according to the comparison result.

[0039] In this embodiment, if Figure 2 As shown, the air conditioner also includes: a rectifier circuit, an inverter circuit, a compressor (a permanent magnet synchronous motor may be used) and a sampling and control circuit. The rectifier circuit is connected to the AC power supply AC and the power factor correction circuit respectively to convert the AC power provided by the AC power supply AC into DC power; the DC end of the inverter circuit is connected in parallel with the capacitor, and the AC end is connected to the compressor. Among them, the sampling and control circuit includes: a PFC current sampling circuit, a PFC control circuit and an ambient temperature sampling circuit. The PFC current sampling circuit is connected to a sampling resistor R1, and the sampling resistor R1 is connected in series between the negative output end of the rectifier circuit and the negative input end of the power factor correction circuit.

[0040] Through the method of the present invention, the capacitor can be selected to have a smaller capacity, such as 680 μF. Figure 3 Shown is the ESR curve for a 680μF capacitor.

[0041] The control method of the air conditioner in the embodiment of the present invention detects the heating condition of the capacitor through the ripple current of the capacitor, and controls the working mode of the power factor correction circuit according to the heating condition, which can ensure the stability of the air conditioner and reduce the capacitor margin when designing the air conditioner. At the same time, compared with the solution of using a temperature testing instrument to detect the heating of the capacitor, it reduces the hardware cost and the size of the air conditioner.

[0042] In some embodiments, the capacitor center temperature is calculated based on the outdoor ambient temperature and the capacitor center temperature rise, including: calculating the product of the outdoor ambient temperature and the ambient temperature coefficient, and taking the sum of the product and the capacitor center temperature rise as the capacitor center temperature.

[0043] Specifically, the outdoor ambient temperature Te is obtained through the ambient temperature sampling circuit, the current obtained through the PFC current sampling circuit can be used to calculate the ripple current IC-RMS of the capacitor C1, and the PFC control circuit obtains the outdoor ambient temperature Te and the ripple current IC-RMS, and calculates the capacitor center temperature rise ΔT and the capacitor center temperature Tc. T c =K*T e +ΔT, where K is the ambient temperature coefficient.

[0044] In some embodiments, obtaining the ripple current IC-RMS of the capacitor C1 includes: obtaining the input current IDC and the output current IO of the power factor correction circuit, and calculating the ripple current IC-RMS of the capacitor C1 according to the input current IDC and the output current IO.

[0045] Specifically, Figure 4 As shown, the power factor correction circuit includes a first switch tube Q1 and a second switch tube Q2 connected in parallel, and the power factor correction circuit also includes an inductor L1, a first diode D11, a second diode D12 and a third diode D13. The first diode D11 is connected in parallel with the first switch tube Q1, the second diode D12 is connected in parallel with the second switch tube Q2, the first end of the inductor L1 is connected to the positive bus, the second end of the inductor L1 is respectively connected to the cathode of the first diode D11, the cathode of the second diode D12 and the anode of the third diode D13, the cathode of the third diode D13 is connected to the first end of the capacitor C1, the anode of the first diode D11 and the anode of the second diode D12 are respectively connected to the negative bus and the second end of the capacitor C1. The input current I of the power factor correction circuit DC and output current I o The ripple current I of the capacitor can be obtained by connecting the current sampling resistors in series at the input and output ends of the power factor correction circuit. C-RMS It can be obtained by the following formula:

[0046] I C-RMS 2 =I D-RMS 2 -I o 2

[0047]

[0048] Among them, Figure 4 As shown, ID-RMS is the diode current, IAC is the AC component of the inductor L1 current, I AC is the AC component of the inductor current (A), and r is the current ripple rate of the inductor L1.

[0049] In some other embodiments, obtaining the ripple current IC-RMS of the capacitor further includes: obtaining the ripple current of the capacitor through a first sampling resistor connected in series with the capacitor.

[0050] Specifically, Figure 5 As shown, the first sampling resistor R11 is connected in series with the capacitor C1, and then connected in parallel with the power factor correction circuit. At this time, the ripple current sampling circuit can directly obtain the ripple current IC-RMS of the capacitor C1 through the first sampling resistor R11.

[0051] In some embodiments, Figure 6 As shown, the power factor correction circuit is controlled according to the comparison result, including:

[0052] S51, if the center temperature of the capacitor is less than or equal to the preset temperature, the power factor correction circuit is controlled to enter the first operating mode, wherein the first operating mode is that the first switch tube is intermittently turned on and the second switch tube is continuously turned off, or that the second switch tube is intermittently turned on and the first switch tube is continuously turned off.

[0053] S52, if the center temperature of the capacitor is greater than the preset temperature, the power factor correction circuit is controlled to enter the second working mode, and the second working mode is that the first switch tube and the second switch tube are alternately turned on.

[0054] Specifically, the waveforms of the power factor correction circuit entering the first working mode and the second working mode are as follows: Figure 7 As shown, ug1 is the control signal input to the control end of the first switch tube Q1, ug2 is the control signal input to the control end of the second switch tube Q2, IL is the current of the inductor L1, TS represents a switch control cycle, t0 represents the on-time of the first switch tube Q1 in one Ts, t3-t0 represents the off-time of the first switch tube Q1 in one Ts, t2-t1 represents the on-time of the second switch tube Q2 in one Ts in the second working mode, and t3-t2+t1 represents the off-time of the second switch tube Q2 in one Ts in the second working mode.

[0055] In this embodiment, if Figure 4 As shown, the power factor correction circuit adopts an interleaved parallel switch topology. According to the interleaved parallel switch topology, it can be obtained:

[0056] D 1 +D 2 =D (1)

[0057]

[0058]

[0059] Where D1 is the duty cycle of the switch Q1; D2 is the duty cycle of the switch Q2; D is the total duty cycle of the interleaved parallel switch topology; Uo is the output voltage of the interleaved parallel switch topology (V); L is the inductance of the inductor L1 (uH); f is the carrier frequency of the interleaved parallel switch topology (Hz); Combining the above equations (1), (2) and (3), we can get:

[0060]

[0061] From formula (4), it can be obtained that when entering the second working mode, the carrier frequency f of the staggered parallel switch topology is increased to twice the original value, which can effectively reduce the heating of the capacitor without reducing the output power.

[0062] In some embodiments, Figure 8 As shown, the control method also includes:

[0063] S81, recording the duration after the power factor correction circuit enters the second working mode.

[0064] S82: When the duration reaches a preset time, the current capacitor center temperature is compared with the preset temperature.

[0065] S83: If the current capacitor center temperature is greater than the preset temperature, the air conditioner is controlled to shut down.

[0066] S84, if the current capacitor center temperature is less than or equal to the preset temperature, control the power factor correction circuit to enter the first working mode.

[0067] Specifically, after the power factor correction circuit enters the second working mode for a period of time, if the center temperature of the capacitor is still greater than the preset temperature, it means that the capacitor is seriously overheated. At this time, the air conditioner needs to be shut down to alleviate the heating of the capacitor; if the center temperature of the capacitor is less than or equal to the preset temperature, it means that the heating of the capacitor has been alleviated. At this time, the power factor correction circuit can be controlled to enter the first working mode again to ensure the user's heating or cooling needs.

[0068] In summary, the control method of the air conditioner in the embodiment of the present invention calculates the center temperature of the capacitor through the outdoor ambient temperature and the ripple current of the capacitor, and controls the working mode of the power factor correction circuit according to the center temperature of the capacitor to adjust the center temperature of the capacitor to be within a reasonable temperature range, thereby improving the reliability of the air conditioner while minimizing the increase in cost and volume of the air conditioner.

[0069] Based on the air conditioner control method of the above embodiment, the present invention further proposes a computer-readable storage medium.

[0070] In this embodiment, a computer program is stored on a computer-readable storage medium, and when the computer program is executed by a processor, the above-mentioned air conditioner control method is implemented.

[0071] Fig. 9 It is a structural block diagram of a controller according to an embodiment of the present invention.

[0072] like Fig. 9 As shown, the controller 900 includes: a processor 901 and a memory 903. The processor 901 and the memory 903 are connected, such as through a bus 902. Optionally, the controller 900 may also include a transceiver 904. It should be noted that in actual applications, the transceiver 904 is not limited to one, and the structure of the controller 900 does not constitute a limitation on the embodiments of the present invention.

[0073] Processor 901 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present invention. Processor 901 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0074] The bus 902 may include a path to transmit information between the above components. The bus 902 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 902 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0075] The memory 903 is used to store a computer program corresponding to the air conditioner control method of the above embodiment of the present invention, and the computer program is controlled and executed by the processor 901. The processor 901 is used to execute the computer program stored in the memory 903 to implement the contents shown in the above method embodiment. Fig. 9The controller 900 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0076] Fig.10 It is a structural block diagram of an air conditioner according to an embodiment of the present invention.

[0077] like Fig.10 As shown, the air conditioner 100 includes: a power factor correction circuit 101 and a capacitor 102 connected in parallel with the output end of the power factor correction circuit, and the above-mentioned controller 900.

[0078] According to one embodiment of the present invention, Fig.10 As shown, the power factor correction circuit 101 includes a first switch tube Q1 and a second switch tube Q2 connected in parallel, and the controller 900 is used for:

[0079] When the center temperature of the capacitor is less than or equal to the preset temperature, the power factor correction circuit is controlled to enter the first working mode, wherein the first working mode is that the first switch tube Q1 is intermittently turned on and the second switch tube Q2 is continuously turned off, or the second switch tube Q2 is intermittently turned on and the first switch tube Q1 is continuously turned off; when the center temperature of the capacitor is greater than the preset temperature, the power factor correction circuit is controlled to enter the second working mode, wherein the second working mode is that the first switch tube Q1 and the second switch tube Q2 are alternately turned on.

[0080] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0081] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0083] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0087] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner comprises a power factor correction circuit and a capacitor connected in parallel with an output end of the power factor correction circuit, and the control method comprises: Obtaining the ripple current of the capacitor, and obtaining the center temperature rise of the capacitor according to the ripple current and the ESR curve of the capacitor; Acquire the outdoor ambient temperature, and calculate the capacitor center temperature according to the outdoor ambient temperature and the capacitor center temperature rise; The capacitor center temperature is compared with a preset temperature, and the power factor correction circuit is controlled according to the comparison result.

2. The air conditioner control method according to claim 1, characterized in that: The power factor correction circuit includes a first switch tube and a second switch tube connected in parallel, and controlling the power factor correction circuit according to the comparison result includes: If the center temperature of the capacitor is less than or equal to the preset temperature, the power factor correction circuit is controlled to enter a first working mode, wherein the first working mode is that the first switch tube is intermittently turned on and the second switch tube is continuously turned off, or the second switch tube is intermittently turned on and the first switch tube is continuously turned off; If the center temperature of the capacitor is greater than the preset temperature, the power factor correction circuit is controlled to enter a second operating mode, in which the first switch tube and the second switch tube are alternately turned on.

3. The air conditioner control method according to claim 2, characterized in that: The obtaining of the ripple current of the capacitor includes: An input current and an output current of the power factor correction circuit are obtained, and a ripple current of the capacitor is calculated according to the input current and the output current.

4. The air conditioner control method according to claim 1 or 2, characterized in that: The obtaining of the ripple current of the capacitor includes: The ripple current of the capacitor is obtained through a first sampling resistor connected in series with the capacitor.

5. The air conditioner control method according to claim 1, characterized in that: The calculating the capacitor center temperature according to the outdoor ambient temperature and the capacitor center temperature rise comprises: The product of the outdoor ambient temperature and the ambient temperature coefficient is calculated, and the sum of the product and the temperature rise of the capacitor center is taken as the capacitor center temperature.

6. The air conditioner control method according to claim 2, characterized in that: The control method further comprises: Recording the duration after the power factor correction circuit enters the second working mode; When the duration reaches a preset time, comparing the current capacitor center temperature with the preset temperature; If the current capacitor center temperature is greater than the preset temperature, the air conditioner is controlled to shut down; If the current capacitor center temperature is less than or equal to the preset temperature, the power factor correction circuit is controlled to enter the first operating mode.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the air conditioner according to any one of claims 1 to 6 is implemented.

8. A controller, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein when the computer program is executed by the processor, the control method of the air conditioner according to any one of claims 1 to 6 is implemented.

9. An air conditioner, characterized in that: include: A power factor correction circuit and a capacitor connected in parallel with the output end of the power factor correction circuit, and a controller according to claim 8.

10. The air conditioner according to claim 9, characterized in that: The power factor correction circuit comprises a first switch tube and a second switch tube connected in parallel, and the controller is used for: When the center temperature of the capacitor is less than or equal to the preset temperature, the power factor correction circuit is controlled to enter a first working mode, wherein the first working mode is that the first switch tube is intermittently turned on and the second switch tube is continuously turned off, or the second switch tube is intermittently turned on and the first switch tube is continuously turned off; When the center temperature of the capacitor is greater than the preset temperature, the power factor correction circuit is controlled to enter a second working mode, and the second working mode is that the first switch tube and the second switch tube are alternately turned on.

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