CN108895632B - Switching method of PFC circuit, air conditioner and computer readable storage medium - Google Patents

Switching method of PFC circuit, air conditioner and computer readable storage medium Download PDF

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Publication number
CN108895632B
CN108895632B CN201810553685.0A CN201810553685A CN108895632B CN 108895632 B CN108895632 B CN 108895632B CN 201810553685 A CN201810553685 A CN 201810553685A CN 108895632 B CN108895632 B CN 108895632B
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pfc
pfc circuit
power factor
frequency
working state
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CN108895632A (en
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李曹磊
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode

Abstract

The invention discloses a switching method of a PFC circuit, which comprises the following steps: acquiring the current power factor of the air conditioner; determining a first working state matched with the power factor based on a mapping relation between a preset power factor and the working state of the PFC circuit; determining whether the first working state is consistent with a current second working state of the PFC circuit; and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state. The invention also discloses an air conditioner and a computer readable storage medium. The invention realizes the adjustment of the working state of the PFC circuit according to the current power factor of the air conditioner, and can reasonably realize the switching between the low-frequency PFC state and the high-frequency PFC state according to the power factor, so that the air conditioner can give consideration to the requirements of energy efficiency and the power factor.

Description

Switching method of PFC circuit, air conditioner and computer readable storage medium
Technical Field
The present invention relates to the field of air conditioner technologies, and in particular, to a switching method for a PFC circuit, an air conditioner, and a computer-readable storage medium.
Background
At present, PFC (Power Factor Correction) technology is commonly applied to air conditioners, and the PFC technology includes low frequency PFC and high frequency PFC.
The low frequency PFC is a PFC technology with a low switching frequency, and the switching frequency is generally less than 1KHz, such as a single pulse PFC and a multi-pulse PFC. The high-frequency PFC is a PFC technology with the switching frequency of more than 30K, comprises topology structures such as Boost PFC and totem-pole PFC and the like, and can effectively improve the power factor. Systems employing high frequency PFC have a high power factor, but are less energy efficient than systems employing low frequency PFC.
The existing air conditioner generally uses high-frequency PFC to obtain higher power factor. However, since the air conditioner using the high frequency PFC is energy inefficient, the demand of the air conditioner for energy efficiency cannot be satisfied at the same time. Some air conditioners only adopting low-frequency PFC cannot meet the requirement of the air conditioner on the power factor. The requirements of the existing air conditioner on energy efficiency and power factor cannot be considered at the same time.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a switching method of a PFC circuit, an air conditioner and a computer readable storage medium, and aims to solve the technical problem that the existing air conditioner often only adopts high-frequency PFC or low-frequency PFC but cannot simultaneously meet the requirements of the air conditioner on energy efficiency and power factor.
In order to achieve the above object, the present invention provides a switching method of a PFC circuit, which is applied to an air conditioner having the PFC circuit, wherein the operating state of the PFC circuit at least includes a low-frequency PFC state and a high-frequency PFC state, and the switching method of the PFC circuit includes the following steps:
acquiring the current power factor of the air conditioner;
determining a first working state matched with the power factor based on a mapping relation between a preset power factor and the working state of the PFC circuit;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
Further, in an embodiment, the step of determining, based on a mapping relationship between a preset power factor and an operating state of the PFC circuit, a first operating state matching the power factor includes:
determining whether the power factor is less than a preset power factor;
and when the power factor is smaller than a preset power factor, determining that the first working state is a high-frequency PFC state.
Further, in an embodiment, after the step of determining whether the power factor is smaller than a preset power factor, the method further includes:
and when the power factor is greater than or equal to a preset power factor, determining that the first working state is a low-frequency PFC state.
Further, in an embodiment, the step of determining whether the first operating state is consistent with the current second operating state of the PFC circuit includes:
determining the PFC frequency corresponding to the second working state and a preset PFC frequency range corresponding to the first working state;
and determining whether the PFC frequency is within the preset PFC frequency range, wherein when the PFC frequency is out of the preset PFC frequency range, the first working state is determined to be inconsistent with the current second working state of the PFC circuit.
Further, in an embodiment, the step of determining the PFC frequency corresponding to the second operating state includes:
sampling the PFC circuit to obtain a current waveform of the PFC circuit;
and determining the PFC frequency according to the current waveform.
Further, in an embodiment, the step of obtaining the power factor of the air conditioner includes:
acquiring apparent power of an outdoor unit of the air conditioner and useful work power of a compressor of the air conditioner;
calculating the power factor based on the apparent power and the useful work power.
Further, in an embodiment, the step of obtaining useful work power of a compressor of the air conditioner includes:
acquiring d-axis current, d-axis voltage, q-axis current and q-axis voltage of the compressor;
calculating the useful work power based on the d-axis current, d-axis voltage, q-axis current, and q-axis voltage.
Further, in an embodiment, the step of obtaining the apparent power of the outdoor unit of the air conditioner includes:
acquiring input current and input voltage of the outdoor unit;
calculating an effective current value based on the input current and an effective voltage value based on the input voltage;
calculating the apparent power based on the effective current value and the effective voltage value.
Further, in an embodiment, the PFC circuit includes a Boost PFC or a totem pole PFC.
Further, to achieve the above object, the present invention also provides an air conditioner including: the switching method comprises a memory, a processor and a switching program of the PFC circuit, wherein the switching program of the PFC circuit is stored on the memory and can run on the processor, and when the switching program of the PFC circuit is executed by the processor, the steps of the switching method of the PFC circuit are realized.
In addition, in order to achieve the above object, the present invention further provides a computer-readable storage medium, wherein a switching program of a PFC circuit is stored on the computer-readable storage medium, and the switching program of the PFC circuit, when executed by a processor, implements the steps of the switching method of the PFC circuit according to any one of the above aspects.
According to the invention, the current power factor of the air conditioner is obtained, then the first working state matched with the power factor is determined based on the mapping relation between the preset power factor and the working state of the PFC circuit, then whether the first working state is consistent with the current second working state of the PFC circuit is determined, and then when the first working state is inconsistent with the second working state, the working state of the PFC circuit is switched to the first working state, so that the working state of the PFC circuit is adjusted according to the current power factor of the air conditioner, the switching between the low-frequency PFC state and the high-frequency PFC state can be reasonably realized according to the power factor, and the air conditioner can meet the requirements of energy efficiency and the power factor.
Drawings
FIG. 1 is a schematic diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a switching method of a PFC circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a current waveform when the PFC circuit of the present invention is in a low frequency PFC state;
FIG. 4 is a schematic diagram of a current waveform when the PFC circuit of the present invention is in a high frequency PFC state;
FIG. 5 is a schematic diagram of the current waveform and power factor waveform of the FPC circuit according to the present invention;
fig. 6 is a detailed flowchart illustrating a step of determining a first operating state matched with a preset power factor based on a mapping relationship between the preset power factor and an operating state of the PFC circuit according to a second embodiment of the switching method for the PFC circuit of the present invention;
fig. 7 is a detailed flowchart of the step of determining whether the first operating state is consistent with the current second operating state of the PFC circuit according to the third embodiment of the switching method of the PFC circuit of the present invention;
fig. 8 is a detailed flowchart illustrating steps of determining a PFC frequency corresponding to the second operating state and a preset PFC frequency range corresponding to the first operating state according to a fourth embodiment of the switching method of the PFC circuit of the present invention;
fig. 9 is a detailed flowchart of the step of obtaining the current power factor of the air conditioner in the fifth embodiment of the switching method of the PFC circuit according to the present invention;
fig. 10 is a detailed flowchart of the step of obtaining useful work power of the compressor of the air conditioner in the sixth embodiment of the switching method of the PFC circuit according to the present invention;
fig. 11 is a detailed flowchart illustrating a step of obtaining apparent power of the outdoor unit in the seventh embodiment of the switching method of the PFC circuit according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the air conditioner may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the air conditioner may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, and other sensors. Of course, the air conditioner may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which are not described herein again.
Those skilled in the art will appreciate that the air conditioner configuration shown in fig. 1 is not intended to be limiting of the air conditioner and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a switching program of the PFC circuit.
In the air conditioner shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be used to invoke a switching procedure of the PFC circuit stored in the memory 1005.
In the present embodiment, an air conditioner includes: the processor 1001 calls the switching program of the PFC circuit stored in the memory 1005, and performs the following operations:
acquiring the current power factor of the air conditioner;
determining a first working state matched with the power factor based on a mapping relation between a preset power factor and the working state of the PFC circuit;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
determining whether the power factor is less than a preset power factor;
and when the power factor is smaller than a preset power factor, determining that the first working state is a high-frequency PFC state.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
and when the power factor is greater than or equal to a preset power factor, determining that the first working state is a low-frequency PFC state.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
determining the PFC frequency corresponding to the second working state and a preset PFC frequency range corresponding to the first working state;
and determining whether the PFC frequency is within the preset PFC frequency range, wherein when the PFC frequency is out of the preset PFC frequency range, the first working state is determined to be inconsistent with the current second working state of the PFC circuit.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
sampling the PFC circuit to obtain a current waveform of the PFC circuit;
and determining the PFC frequency according to the current waveform.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
acquiring apparent power of an outdoor unit of the air conditioner and useful work power of a compressor of the air conditioner;
calculating the power factor based on the apparent power and the useful work power.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
acquiring d-axis current, d-axis voltage, q-axis current and q-axis voltage of the compressor;
calculating the useful work power based on the d-axis current, d-axis voltage, q-axis current, and q-axis voltage.
Further, the processor 1001 may call a switching program of the PFC circuit stored in the memory 1005, and also perform the following operations:
acquiring input current and input voltage of the outdoor unit;
calculating an effective current value based on the input current and an effective voltage value based on the input voltage;
calculating the apparent power based on the effective current value and the effective voltage value.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the switching method of the PFC circuit according to the present invention.
In this embodiment, the switching method of the PFC circuit is applied to an air conditioner having the PFC circuit, and the operating state of the PFC circuit at least includes a low-frequency PFC state and a high-frequency PFC state. The working state of the PFC circuit is in a low-frequency PFC state, and the PFC circuit operates under the low-frequency PFC function, so that the energy efficiency of the air conditioner is improved; when the working state of the PFC circuit is in a high-frequency PFC state, the PFC circuit operates under the high-frequency PFC function so as to improve the power factor of the air conditioner.
The PFC circuit comprises a Boost PFC or a totem pole PFC. Because the Boost PFC can also Boost the voltage of a direct current bus of the compressor, the PFC circuit can adopt the Boost PFC. Specifically, when the PFC circuit is in a low-frequency PFC state, the PFC circuit is a low-frequency multi-pulse PFC or a low-frequency single-pulse PFC, and when the PFC circuit is in a high-frequency PFC state, the PFC circuit is a Boost PFC.
As shown in fig. 3, fig. 3 is a current waveform of the PFC circuit in a low frequency PFC state, and the current waveform of the low frequency PFC usually exhibits the periodicity shown in fig. 3, and does not exhibit a current spike or a sine wave when the PFC is off. Compared with a high-frequency PFC state, the efficiency of the PFC circuit is higher at the moment, and the ultrahigh energy efficiency of the air conditioner is more favorably realized.
As shown in fig. 4, fig. 4 is a current waveform of the PFC circuit in a high frequency PFC state, and the current waveform of the high frequency PFC circuit generally has a sinusoidal waveform in fig. 4 and is in phase with the input ac voltage. Compared with the low-frequency PFC state, the PFC circuit can stabilize the direct-current bus voltage of the compressor, can raise the direct-current bus voltage and can reduce the current increase caused by weak magnetism.
In this embodiment, the switching method of the PFC circuit includes:
step S100, acquiring the current power factor of the air conditioner;
in this embodiment, the current power factor of the air conditioner may be obtained in real time or at regular time while the air conditioner is running. The power factor is the power factor of the outdoor unit system of the air conditioner and can be obtained through the useful power of the outdoor unit and the apparent power of the outdoor unit. Since the power of the compressor occupies most of the power consumed by the outdoor unit in the inverter air conditioner control system, the useful power consumed by the compressor can be used to replace the useful power of the outdoor unit, i.e. the power factor is obtained by the apparent power of the outdoor unit and the useful power of the compressor.
Step S200, determining a first working state matched with the power factor based on a mapping relation between a preset power factor and the working state of the PFC circuit;
in this embodiment, a mapping relationship between a preset power factor and a working state of the PFC circuit may be preset, and when the power factor is obtained, a first working state matched with the power factor is obtained according to the power factor and the mapping relationship between the preset power factor and the working state of the PFC circuit.
Step S300, determining whether the first working state is consistent with the current second working state of the PFC circuit;
step S400, when the first operating state is inconsistent with the second operating state, switching the operating state of the PFC circuit to the first operating state.
In the embodiment, when the first working state is determined, whether the first working state is consistent with the current second working state of the PFC circuit is determined; specifically, whether the first operating state is consistent with the second operating state or not can be determined through a preset frequency range corresponding to the first operating state and a PFC frequency corresponding to the current second operating state of the PFC circuit, that is, the current PFC frequency of the PFC circuit, wherein when the PFC frequency is within the preset frequency range, the first operating state is determined to be consistent with the second operating state, and when the PFC frequency is outside the preset frequency range, the first operating state is determined to be inconsistent with the second operating state.
For example, if the first operating state is a low-frequency PFC state, the preset frequency range is a frequency range corresponding to the low-frequency PFC, and when the current PFC frequency of the PFC circuit is within the preset frequency range, the PFC circuit is in the low-frequency PFC state, that is, the first operating state is consistent with the second operating state, otherwise, the first operating state is inconsistent with the second operating state; if the first working state is a high-frequency PFC state, the preset frequency range is a frequency range corresponding to the high-frequency PFC, and when the current PFC frequency of the PFC circuit is within the preset frequency range, the PFC circuit is in the high-frequency PFC state, namely the first working state is consistent with the second working state, otherwise, the first working state is inconsistent with the second working state.
When the first working state is determined to be inconsistent with the second working state, switching the working state of the PFC circuit to the first working state; for example, if the first operating state is a low-frequency PFC state and the second operating state is a high-frequency PFC state, the operating state of the PFC circuit is switched to the low-frequency PFC state, that is, the operating state of the PFC circuit is switched from the high-frequency PFC state to the low-frequency PFC state; and then switching between a low-frequency PFC state and a high-frequency PFC state in the PFC circuit is realized, and the working state of the PFC circuit can be switched from the high-frequency PFC state to the low-frequency PFC state under a specific working condition so as to ensure the high energy efficiency of the air conditioner, or the working state of the PFC circuit is switched from the low-frequency PFC state to the high-frequency PFC state so as to ensure the high power factor operation of the air conditioner, and further the requirements of the air conditioner on energy efficiency and power factor are considered.
When the air conditioner is debugged before shipping, the oscilloscope is used for sampling and collecting the current waveform of the PFC current, the PFC frequency of the PFC circuit is obtained through the current waveform, and the current waveform of the FPC circuit can be displayed on the display interface of the oscilloscope. Meanwhile, a power analyzer is connected to the outdoor unit of the air conditioner to measure the power factor of the outdoor unit. During measurement, the power factor of the air conditioner can be changed by manually setting the running frequency of the compressor, so that the value of the power factor measured by the power analyzer is changed, and the power factor waveform can be displayed on a display interface of the power analyzer. Referring to fig. 5, fig. 5 is a schematic diagram of a current waveform and a power factor waveform of the FPC circuit, in the schematic diagram of the power factor waveform of fig. 5, a solid line is a power factor waveform curve, and a dotted line is a preset power factor waveform curve; as can be seen from fig. 5, when the power factor reaches the preset power factor, the operating state of the PFC circuit is switched from the low-frequency PFC state to the high-frequency PFC state, so as to ensure the high-power factor operation of the air conditioner.
Compared with the existing air conditioner adopting the high-frequency PFC, the air conditioner adopting the switching method of the PFC circuit can meet the requirements of energy efficiency and power factor, and further solves the problems of high energy consumption and low efficiency of the air conditioner. If Boost PFC is adopted, the air conditioner can also meet the Boost requirement of the bus voltage of the compressor.
According to the switching method of the PFC circuit, the current power factor of the air conditioner is obtained, then the first working state matched with the power factor is determined based on the mapping relation between the preset power factor and the working state of the PFC circuit, whether the first working state is consistent with the current second working state of the PFC circuit is determined, and then when the first working state is inconsistent with the second working state, the working state of the PFC circuit is switched to the first working state, so that the working state of the PFC circuit is adjusted according to the current power factor of the air conditioner, the switching between the low-frequency PFC state and the high-frequency PFC state can be reasonably realized according to the power factor, and the requirements of the air conditioner on energy efficiency and the power factor can be met.
Based on the first embodiment, a second embodiment of the switching method of the PFC circuit of the present invention is proposed, and referring to fig. 6, in this embodiment, step S200 includes:
step S210, determining whether the power factor is smaller than a preset power factor;
step S220, when the power factor is smaller than a preset power factor, determining that the first working state is a high-frequency PFC state.
Further, in an embodiment, after step S210, the method further includes: and when the power factor is greater than or equal to a preset power factor, determining that the first working state is a low-frequency PFC state.
In this embodiment, when the current power factor of the air conditioner is obtained, it is determined whether the power factor is smaller than a preset power factor, if the power factor is smaller than the preset power factor, it is determined that the first operating state is a low-frequency PFC state, and if the power factor is greater than or equal to the preset power factor, it is determined that the high-frequency first operating state is a high-frequency PFC state, so that the first operating state can be accurately determined according to the power factor of the compressor, and the accuracy of the PFC circuit in switching between the low-frequency PFC state and the high-frequency PFC state is improved.
The preset power factor can be reasonably set, for example, the preset power factor can be reasonably set according to the working condition of the air conditioner.
According to the switching method of the PFC circuit provided by the embodiment, whether the power factor is smaller than the preset power factor or not is determined, and then when the power factor is smaller than the preset power factor, the first working state is determined to be the high-frequency PFC state, so that the first working state can be accurately determined according to the power factor, the switching accuracy of the PFC circuit between the low-frequency PFC state and the high-frequency PFC state is improved, and the air conditioner can meet the requirements of energy efficiency and the power factor.
Based on the first embodiment, a third embodiment of the switching method of the PFC circuit of the present invention is proposed, and referring to fig. 7, in this embodiment, step S300 includes:
step S310, determining a PFC frequency corresponding to the second working state and a preset PFC frequency range corresponding to the first working state;
step S320, determining whether the PFC frequency is within the preset PFC frequency range, wherein when the PFC frequency is outside the preset PFC frequency range, it is determined that the first operating state is inconsistent with the second operating state.
In this embodiment, when a first operating state matched with the operating frequency of the compressor is determined, a preset PFC frequency range corresponding to the first operating state and a PFC frequency corresponding to a current second operating state of the PFC circuit are obtained, where the PFC frequency refers to the current operating frequency of the PFC circuit, the preset PFC frequency range refers to a PFC frequency range when the PFC circuit is in the first operating state, and if the first operating state is a high-frequency PFC state, the preset frequency range is a frequency range corresponding to a high-frequency PFC.
When the PFC frequency and the preset PFC frequency range are determined, whether the PFC frequency is in the preset PFC frequency range is determined, if the PFC frequency is in the preset PFC frequency range, the first working state is judged to be consistent with the second working state, at the moment, the working state of the PFC circuit does not need to be adjusted, if the PFC frequency is out of the preset PFC frequency range, the first working state is judged to be inconsistent with the current second working state of the PFC circuit, at the moment, the working state of the PFC circuit needs to be switched, and therefore the requirements of the air conditioner for high energy efficiency and high power factor are met.
In the switching method of the PFC circuit provided in this embodiment, by determining the PFC frequency corresponding to the second operating state and the preset PFC frequency range corresponding to the first operating state, and then determining whether the PFC frequency is within the preset PFC frequency range, when the PFC frequency is outside the preset PFC frequency range, it is determined that the first operating state is inconsistent with the second operating state, and whether the first operating state is consistent with the second operating state can be accurately determined according to the PFC frequency and the preset PFC frequency range, so that the accuracy of switching the PFC circuit between the high-frequency PFC state and the low-frequency PFC state is improved.
Based on the third embodiment, a fourth embodiment of the switching method of the PFC circuit of the present invention is proposed, and referring to fig. 8, in this embodiment, step S310 includes:
step S311, performing a sampling operation on the PFC circuit to obtain a current waveform of the PFC circuit;
step S312, determining the PFC frequency according to the current waveform.
In this embodiment, referring to fig. 3 and 4, since the current waveform of the low-frequency PFC has the periodicity shown in fig. 3, and the current waveform of the high-frequency PFC has the sine wave shape shown in fig. 4 and is in phase with the input ac voltage, the sampling circuit can sample the PFC circuit to obtain the current waveform of the PFC circuit, and determine the PFC frequency according to the current waveform, so as to accurately determine the current PFC frequency of the PFC circuit.
According to the switching method of the PFC circuit, the current waveform of the PFC circuit is obtained by sampling the PFC circuit, the PFC frequency is determined according to the current waveform, the PFC frequency can be accurately determined according to the current waveform of the PFC circuit, whether the first working state is consistent with the second working state or not is accurately judged according to the PFC frequency and the preset PFC frequency range, and the accuracy of switching the PFC circuit between the high-frequency PFC state and the low-frequency PFC state is further improved.
Based on the first embodiment, a fifth embodiment of the switching method of the PFC circuit of the present invention is proposed, and referring to fig. 9, in this embodiment, step S100 includes:
step S110, acquiring apparent power of the outdoor unit of the air conditioner and useful work power of a compressor of the air conditioner;
step S120, calculating the power factor based on the apparent power and the useful work power.
In this embodiment, since the power of the compressor occupies most of the power consumed by the outdoor unit in the inverter air conditioner control system, the useful power consumed by the compressor can be used to replace the useful power of the outdoor unit, i.e., the power factor is obtained by the apparent power of the outdoor unit and the useful power of the compressor.
That is, the apparent power of the outdoor unit of the air conditioner and the useful power of the compressor are obtained, and then the power factor is obtained according to the apparent power and the useful power, specifically, the power factor can be obtained by the following formula:
Figure BDA0001681281530000121
where eta is the power factor, pcompFor useful power, pSIs the apparent power of the outdoor unit.
According to the switching method of the PFC circuit, by acquiring the apparent power of the outdoor unit of the air conditioner and the useful power of the compressor of the air conditioner and then calculating the power factor based on the apparent power and the useful power, the power factor can be accurately obtained according to the apparent power of the outdoor unit and the useful power of the compressor, so that the first working state is accurately determined according to the power factor, and the accuracy of switching between the low-frequency PFC state and the high-frequency PFC state of the PFC circuit is improved.
Based on the fifth embodiment, a sixth embodiment of the switching method of the PFC circuit of the present invention is proposed, and referring to fig. 10, in this embodiment, step S110 includes:
step S111, acquiring d-axis current, d-axis voltage, q-axis current and q-axis voltage of the compressor;
step S112, calculating the useful work power based on the d-axis current, the d-axis voltage, the q-axis current and the q-axis voltage.
In the embodiment, the useful work power of the compressor can be calculated by the d-axis current, the d-axis voltage, the q-axis current and the q-axis electricity of the compressor, and specifically, the d-axis current i of the compressor is obtaineddD-axis voltage udQ-axis current iqAnd q-axis voltage uqAnd calculating the useful work power p according to the following formulacomp：
pcomp＝udid+uqiq。
Specifically, the d-axis current i of the compressor can be obtained by the existing algorithmdAnd q-axis current iqAnd obtaining flux linkage components of a stator of the compressor under d and q axes through a stator flux linkage equation, wherein the stator flux linkage equation is as follows:
Figure BDA0001681281530000131
wherein L isd、LqEquivalent inductances of stator inductances of the compressor under d and q axes are respectively; psifPassing the magnetic flux linkage of the stator winding for the rotor excitation magnetic field linkage; psid、ψqThe flux linkage components of the stator of the compressor under the d and q axes, respectively.
Then, according to the d-axis current idQ-axis current iqFlux linkage component psi of stator under d, q axesd、ψqD-axis voltage u is obtained through calculation of a motor voltage equationdAnd q-axis voltage uqThe motor voltage equation is as follows:
Figure BDA0001681281530000132
wherein p is a differential operator, RsIs stator resistance, ωrIs the rotor angular velocity.
According to the switching method of the PFC circuit, the d-axis current, the d-axis voltage, the q-axis current and the q-axis voltage of the compressor are obtained, then the useful power is calculated based on the d-axis current, the d-axis voltage, the q-axis current and the q-axis voltage, the useful power of the compressor can be accurately obtained according to the d-axis current, the d-axis voltage, the q-axis current and the q-axis voltage, the first working state is accurately determined according to the useful power, and the accuracy of switching between the low-frequency PFC state and the high-frequency PFC state of the PFC circuit is further improved.
Based on the fifth embodiment, a seventh embodiment of the switching method of the PFC circuit of the present invention is proposed, and referring to fig. 11, in this embodiment, step S110 includes:
step S113, acquiring an input current and an input voltage of the outdoor unit;
step S114, calculating an effective current value based on the input current and calculating an effective voltage value based on the input voltage;
step S115, calculating the apparent power based on the effective current value and the effective voltage value.
In this embodiment, a voltage and current collecting module may be disposed in the air conditioner, and the voltage and current collecting module collects the input current and the input voltage of the outdoor unit, and since the collected input current and the collected input voltage are respectively an ac current and an ac voltage, an effective current value of the input current and an effective voltage value of the input voltage are calculated, and the apparent power of the outdoor unit is obtained according to the effective current value and the effective voltage value, so as to accurately obtain the apparent power of the outdoor unit.
According to the switching method of the PFC circuit, the input current and the input voltage of the outdoor unit are obtained, the effective current value is calculated based on the input current, the effective voltage value is calculated based on the input voltage, the apparent power is calculated based on the effective current value and the effective voltage value, the apparent power of the outdoor unit can be accurately obtained according to the input current and the input voltage, the first working state is accurately determined according to the apparent power, and the accuracy of switching between the low-frequency PFC state and the high-frequency PFC state of the PFC circuit is further improved.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a switching program of a PFC circuit is stored, and when executed by a processor, the switching program of the PFC circuit implements the following operations:
acquiring the current power factor of the air conditioner;
determining a first working state matched with the power factor based on a mapping relation between a preset power factor and the working state of the PFC circuit;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
determining whether the power factor is less than a preset power factor;
and when the power factor is smaller than a preset power factor, determining that the first working state is a high-frequency PFC state.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
and when the power factor is greater than or equal to a preset power factor, determining that the first working state is a low-frequency PFC state.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
determining the PFC frequency corresponding to the second working state and a preset PFC frequency range corresponding to the first working state;
and determining whether the PFC frequency is within the preset PFC frequency range, wherein when the PFC frequency is out of the preset PFC frequency range, the first working state is determined to be inconsistent with the current second working state of the PFC circuit.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
sampling the PFC circuit to obtain a current waveform of the PFC circuit;
and determining the PFC frequency according to the current waveform.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
acquiring apparent power of an outdoor unit of the air conditioner and useful work power of a compressor of the air conditioner;
calculating the power factor based on the apparent power and the useful work power.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
acquiring d-axis current, d-axis voltage, q-axis current and q-axis voltage of the compressor;
calculating the useful work power based on the d-axis current, d-axis voltage, q-axis current, and q-axis voltage.
Further, the switching program of the PFC circuit when executed by the processor further implements the following operations:
acquiring input current and input voltage of the outdoor unit;
calculating an effective current value based on the input current and an effective voltage value based on the input voltage;
calculating the apparent power based on the effective current value and the effective voltage value.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A switching method of a PFC circuit is characterized by being applied to an air conditioner provided with the PFC circuit, the working state of the PFC circuit at least comprises a low-frequency PFC state and a high-frequency PFC state, and the switching method of the PFC circuit comprises the following steps:
acquiring the current power factor of the air conditioner;
determining a first working state matched with the power factor based on a mapping relation between a preset power factor and the working state of the PFC circuit;
determining a PFC frequency corresponding to a current second working state of the PFC circuit and a preset PFC frequency range corresponding to the first working state;
determining whether the PFC frequency is within the preset PFC frequency range, wherein when the PFC frequency is outside the preset PFC frequency range, it is determined that the first working state is inconsistent with the second working state;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
2. The switching method of the PFC circuit of claim 1, wherein the step of determining the first operating state matching the power factor based on a mapping relationship between a preset power factor and an operating state of the PFC circuit comprises:
determining whether the power factor is less than a preset power factor;
and when the power factor is smaller than a preset power factor, determining that the first working state is a high-frequency PFC state.
3. The switching method of the PFC circuit of claim 2, wherein the step of determining whether the power factor is less than a preset power factor further comprises:
and when the power factor is greater than or equal to a preset power factor, determining that the first working state is a low-frequency PFC state.
4. The switching method of the PFC circuit of claim 1, wherein the step of determining the PFC frequency corresponding to the second operating state comprises:
sampling the PFC circuit to obtain a current waveform of the PFC circuit;
and determining the PFC frequency according to the current waveform.
5. The switching method of the PFC circuit of claim 1, wherein the step of acquiring the power factor of the air conditioner comprises:
acquiring apparent power of an outdoor unit of the air conditioner and useful work power of a compressor of the air conditioner;
calculating the power factor based on the apparent power and the useful work power.
6. The switching method of the PFC circuit of claim 5, wherein the step of obtaining the useful work power of a compressor of the air conditioner comprises:
acquiring d-axis current, d-axis voltage, q-axis current and q-axis voltage of the compressor;
calculating the useful work power based on the d-axis current, d-axis voltage, q-axis current, and q-axis voltage.
7. The switching method of the PFC circuit of claim 5, wherein the step of obtaining the apparent power of the outdoor unit of the air conditioner comprises:
acquiring input current and input voltage of the outdoor unit;
calculating an effective current value based on the input current and an effective voltage value based on the input voltage;
calculating the apparent power based on the effective current value and the effective voltage value.
8. The switching method of the PFC circuit of any of claims 1 to 7, wherein the PFC circuit comprises a Boost PFC or a totem-pole PFC.
9. An air conditioner, characterized in that the air conditioner comprises: memory, a processor and a switching program of a PFC circuit stored on the memory and executable on the processor, the switching program of the PFC circuit implementing the steps of the switching method of a PFC circuit according to any one of claims 1 to 8 when executed by the processor.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a switching program of a PFC circuit, which when executed by a processor implements the steps of the switching method of the PFC circuit according to any one of claims 1 to 8.
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