CN113612378A - Method and device for controlling PFC circuit of variable frequency air conditioner, air conditioner and storage medium - Google Patents

Method and device for controlling PFC circuit of variable frequency air conditioner, air conditioner and storage medium Download PDF

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Publication number
CN113612378A
CN113612378A CN202110841841.5A CN202110841841A CN113612378A CN 113612378 A CN113612378 A CN 113612378A CN 202110841841 A CN202110841841 A CN 202110841841A CN 113612378 A CN113612378 A CN 113612378A
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pfc circuit
voltage
circuit
sampling
current
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CN202110841841.5A
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CN113612378B (en
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高思云
牟宗娥
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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Priority to CN202110841841.5A priority Critical patent/CN113612378B/en
Publication of CN113612378A publication Critical patent/CN113612378A/en
Priority to PCT/CN2022/103191 priority patent/WO2023005594A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
    • H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Rectifiers (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a method and a device for controlling a PFC circuit of a variable frequency air conditioner, the air conditioner and a storage medium, wherein the PFC control method of the variable frequency air conditioner comprises the following steps: the method for controlling the PFC circuit of the variable frequency air conditioner comprises the following steps: acquiring alternating current power supply sampling voltage, alternating current power supply sampling current and direct current bus sampling voltage; obtaining the instruction current value of the PFC circuit according to the AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage; determining that the command current value is less than or equal to a preset current value; and controlling the PFC circuit to perform soft start. The method for controlling the PFC circuit of the variable-frequency air conditioner performs soft start control on the PFC circuit according to the determined instruction current value, and can quickly reduce the bus voltage, thereby realizing the protection of the PFC circuit and the safety control of an electrolytic capacitor.

Description

Method and device for controlling PFC circuit of variable frequency air conditioner, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling a Power Factor Correction (PFC) circuit of a variable frequency air conditioner, the air conditioner and a storage medium.
Background
The inverter air conditioner generally has a PFC function in order to improve the utilization rate of power supply energy and reduce harmonic pollution to a power grid, and the inverter air conditioner generally adopts a PFC circuit, so that the power factor of the whole machine can be greatly improved, and reliable direct-current voltage is provided for an inverter load compressor. In the case where the PFC circuit is normally operated, as shown in fig. 1, the waveform diagram of the relationship between the ac input voltage and the ac input current and time when the PFC circuit is normally operated is shown, where a curve a shows the waveform of the ac input voltage when the PFC circuit is normally operated, a curve B shows the waveform of the ac input current when the PFC circuit is normally operated, Vpeak shows the peak value of the ac input voltage, Ipeak shows the peak value of the ac input current, the waveform of the ac input current and the waveform of the ac input voltage are both sinusoidal, and the phase of the waveform of the ac input current coincides with the phase of the input ac voltage waveform.
After the PFC circuit works, the boost control of the direct-current voltage is also carried out while the power factor correction is carried out. During the working process of the PFC circuit, if the load of a compressor at the rear end suddenly and sharply decreases, such as when a four-way valve is reversed, the voltage of a bus is increased due to the boosting function of the PFC circuit, at the moment, the electric quantity of an electrolytic capacitor consumed by the load is reduced, the voltage loop control output value of the PFC circuit is rapidly reduced, the current loop control output value is reduced and can be reduced to zero at the minimum, but under the condition of small load, even if the output of double loop control is zero, the voltage of the bus still increases due to the action of voltage feedforward control, and the voltage of the bus can not be reduced until the PFC circuit is closed. In this process, the fault caused by the over-high bus voltage may affect the use of the user, and is not favorable for the safety control of the electrolytic capacitor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one of the objectives of the present invention is to provide a method for controlling a PFC circuit of a variable frequency air conditioner, wherein when it is determined that a command current value is less than or equal to a preset current value, the PFC circuit is controlled to perform soft start, so as to rapidly reduce a bus voltage, thereby protecting the PFC circuit and safely controlling an electrolytic capacitor.
The invention also provides a device for controlling the PFC circuit of the variable frequency air conditioner.
The invention also aims to provide an inverter air conditioner.
It is a further object of this invention to provide a non-transitory computer readable storage medium.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for controlling a PFC circuit of an inverter air conditioner, where the method includes: acquiring alternating current power supply sampling voltage, alternating current power supply sampling current and direct current bus sampling voltage; obtaining the instruction current value of the PFC circuit according to the AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage; determining that the command current value is less than or equal to a preset current value; and controlling the PFC circuit to perform soft start.
According to the method for controlling the PFC circuit of the variable-frequency air conditioner, the instruction current value of the PFC circuit is obtained based on the obtained sampling voltage of the alternating-current power supply, the obtained sampling current of the alternating-current power supply and the obtained sampling voltage of the direct-current bus. When the load connected with the PFC circuit is suddenly reduced, the bus voltage is continuously increased, the command current value is suddenly reduced, the PFC circuit is directly controlled to be in soft start by setting the preset current value when the command current value is determined to be smaller than or equal to the preset current value, so that the bus voltage is quickly reduced, the condition that the use of a user is influenced by faults caused by overhigh bus voltage is avoided, the risk that the rear-end electrolytic capacitor is broken down caused by overhigh bus voltage can be reduced, and the protection of the PFC circuit and the safety control of the electrolytic capacitor are realized.
In some embodiments of the invention, the preset current value is zero.
In some embodiments of the present invention, controlling the PFC circuit for soft start comprises: and controlling the PFC circuit to operate at a preset initial duty ratio, and controlling the duty ratio of a driving signal of the PFC circuit to be increased from the preset initial duty ratio to a target duty ratio within a preset time period.
In some embodiments of the present invention, controlling the duty cycle of the driving signal of the PFC circuit to be increased from the preset initial duty cycle to a target duty cycle within a preset time period includes: and within a preset time length, controlling the duty ratio of a driving signal of the PFC circuit to be linearly increased from the preset initial duty ratio until the target duty ratio is reached.
In some embodiments of the invention, after controlling the PFC circuit for soft start, the method further comprises: and protecting the PFC circuit according to the sampling voltage of the direct current bus.
In some embodiments of the present invention, protecting the PFC circuit according to the dc bus sampling voltage includes: determining that the sampling voltage of the direct current bus is greater than a first voltage threshold value, controlling the variable frequency air conditioner to stop and carrying out fault alarm; or determining that the sampling voltage of the direct current bus is greater than a second voltage threshold value, and controlling the PFC circuit to be closed, wherein the second voltage threshold value is smaller than the first voltage threshold value.
In order to achieve the above object, an apparatus for controlling a PFC circuit of an inverter air conditioner according to an embodiment of a second aspect of the present invention includes: the parameter acquisition module is used for acquiring alternating current power supply input voltage, alternating current power supply input current and direct current bus sampling voltage; the instruction current obtaining module is used for obtaining an instruction current value of the PFC circuit according to the alternating-current power supply input voltage, the alternating-current power supply input current and the direct-current bus sampling voltage; the determining module is used for determining that the instruction current value is less than or equal to a preset current value; and the control module is used for controlling the PFC circuit to carry out soft start.
According to the device for controlling the PFC circuit of the variable-frequency air conditioner, the instruction current value of the PFC circuit is obtained according to the collected sampling voltage of the alternating-current power supply, the collected sampling current of the alternating-current power supply and the collected sampling voltage of the direct-current bus based on the framework of the parameter obtaining module, the instruction current obtaining module and the determining module. When the load suddenly changes, the command current value is reduced, and the bus voltage is increased. When the instruction current value is determined to be smaller than or equal to the preset current value, the control module directly controls the PFC circuit to perform soft start, so that the bus voltage is rapidly reduced, the influence of faults caused by overhigh bus voltage on the use of a user is avoided, the risk of breakdown of the rear-end electrolytic capacitor caused by overhigh bus voltage can be reduced, and the PFC circuit is protected and the electrolytic capacitor is safely controlled.
In order to achieve the above object, an inverter air conditioner according to an embodiment of a third aspect of the present invention includes: the input end of the rectifying circuit is connected with an alternating current power supply; the input end of the PFC circuit is connected with the output end of the rectification circuit; the alternating voltage sampling circuit is connected with the input end of the rectifying circuit and is used for detecting the sampling voltage of the alternating power supply; the alternating current sampling circuit is connected with the output end of the PFC circuit and is used for detecting the sampling current of the alternating current power supply; the direct current bus voltage sampling circuit is connected with the output end of the PFC circuit and is used for collecting direct current bus sampling voltage; the controller is respectively connected with the alternating-current voltage sampling circuit, the alternating-current sampling circuit and the direct-current bus voltage sampling circuit and is used for controlling the PFC circuit of the variable-frequency air conditioner according to the method for controlling the PFC circuit of the variable-frequency air conditioner in any one embodiment.
According to the variable frequency air conditioner of the embodiment of the invention, the alternating current voltage sampling circuit, the alternating current sampling circuit and the direct current bus voltage sampling circuit respectively send the collected alternating current power supply sampling voltage, the collected alternating current power supply sampling current and the collected direct current bus sampling voltage to the controller, and the controller controls the running state of the PFC circuit based on the obtained alternating current power supply sampling voltage, the collected alternating current power supply sampling current and the collected direct current bus sampling voltage, the variable frequency air conditioner of the invention is based on the framework of the rectification circuit, the PFC circuit, the alternating current voltage sampling circuit, the collected direct current bus voltage sampling circuit and the collected direct current bus sampling voltage, does not change the cost, optimizes the control method of the PFC circuit by executing the method for controlling the PFC circuit of the variable frequency air conditioner of the first aspect, and controls the PFC circuit to work according to the optimized calculation control method under the condition that the rear-end load is sharply reduced, the bus voltage can be rapidly reduced, the overvoltage protection is prevented, and the service life of the electrolytic capacitor is not influenced.
In some embodiments of the invention, the PFC circuit comprises: the first end of the inductor is connected with the first output end of the rectifying circuit; the input end of the PFC driving circuit is connected with the controller; the first end of the IGBT module is connected with the output end of the PFC driving circuit, the second end of the IGBT module is connected with the second end of the inductor, and the third end of the IGBT module is respectively connected with the alternating current sampling circuit and the direct current bus voltage sampling circuit; the anode of the diode is connected with the second end of the IGBT module, and the cathode of the diode is connected with the direct-current bus voltage sampling circuit; and a first end of the electrolytic capacitor is connected with the cathode of the diode, and a second end of the electrolytic capacitor is connected with a third end of the IGBT module.
In order to achieve the above object, a non-transitory computer-readable storage medium is provided in a fourth embodiment of the present invention, on which a computer program is stored, wherein the computer program is configured to implement, when executed by a processor, the method for controlling a PFC circuit of an inverter air conditioner according to any one of the above embodiments.
According to the computer-readable storage medium of the embodiment of the invention, a computer program is stored on the storage medium, when the computer program is executed, the computer program can read instructions and obtain operation parameters of all components in the inverter air conditioner, and the operation parameters and the like are calculated and processed, and the operation states of all the components in the inverter air conditioner are memorized, so that the method for controlling the PFC circuit of the inverter air conditioner can be realized, and under the condition that the rear-end load is suddenly reduced, the bus voltage can be quickly reduced, so that the PFC circuit can be protected, and the service life of the electrolytic capacitor is not influenced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a waveform diagram of AC input voltage and AC input current versus time for normal operation of a PFC circuit;
FIG. 2 is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to an embodiment of the invention;
FIG. 3 is a flowchart of a method for controlling a PFC circuit of a variable frequency air conditioner according to another embodiment of the invention;
FIG. 4 is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the invention;
FIG. 5 is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the invention;
FIG. 6 is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the invention;
FIG. 7 is a flowchart of a method for controlling a PFC circuit of a variable frequency air conditioner according to another embodiment of the invention;
FIG. 8 is a block diagram of an apparatus for controlling a PFC circuit of an inverter air conditioner according to an embodiment of the invention;
FIG. 9 is a block diagram of an inverter air conditioner according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a PFC circuit according to one embodiment of the present invention;
fig. 11 is a schematic view of an inverter air conditioner according to an embodiment of the present invention.
Reference numerals:
a variable frequency air conditioner 10;
a device 100 for controlling a PFC circuit of a variable frequency air conditioner;
the device comprises a parameter acquisition module 101, an instruction current acquisition module 102, a determination module 103 and a control module 104;
the device comprises a rectification circuit 1, a PFC circuit 2, an alternating current voltage sampling circuit 3, an alternating current sampling circuit 4, a direct current bus voltage sampling circuit 5 and a controller 6;
alternating current power supply U, inductance L1, PFC drive circuit 21, IGBT module 22, diode D1, electrolytic capacitor C1, resistance R.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In order to solve the problem that the bus voltage still rises under the condition that the load of a PFC circuit is very small and even when the output of double-loop control is zero, the embodiment of the invention provides a PFC control method and a PFC control device of a variable-frequency air conditioner and the variable-frequency air conditioner adopting the PFC control device.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The air conditioner performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. Wherein the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
An air conditioner according to some embodiments of the present application includes an air conditioner indoor unit installed in an indoor space. The indoor unit, i.e., the indoor unit, is connected to an outdoor unit, i.e., the outdoor unit, installed in an outdoor space through a pipe. The outdoor unit of the air conditioner may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and the like for a refrigeration cycle, and the indoor unit of the air conditioner may be provided with an indoor heat exchanger and an indoor fan.
A method of controlling a PFC circuit of an inverter air conditioner according to an embodiment of the present invention is described below with reference to fig. 2 to 7. It should be noted that the step numbers in the present application, such as S1, S2, S3, S4, and the like, are only for convenience of describing the present solution, and are not to be construed as limiting the order of the steps. That is, the execution order of, for example, steps S1, S2, S3, S4, etc. may be specifically determined according to actual needs, and is not limited to the control in the order of steps in the following embodiments.
In some embodiments of the present invention, as shown in fig. 2, a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to an embodiment of the present invention is provided, where the method for controlling the PFC circuit of the inverter air conditioner at least includes steps S1-S4, which are described as follows.
And S1, acquiring the AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage.
In the embodiment, because the PFC circuit has the function of power factor correction, the PFC circuit is arranged before the variable frequency air conditioner, the power factor correction of the alternating current input current flowing into the load and the power correction of the sampling voltage of the direct current bus can be realized, and the reliable sampling voltage of the direct current bus is provided for the load.
An alternating voltage sampling circuit can be arranged to be connected with the alternating current power supply and used for detecting the sampling voltage of the alternating current power supply. The method comprises the steps of setting an alternating current sampling circuit to be connected with a PFC circuit and used for detecting sampling current of an alternating current power supply, and setting a direct current bus voltage sampling circuit to be connected with the PFC circuit and used for collecting direct current bus sampling voltage. The collected AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage can be obtained by the controller.
And S2, obtaining the instruction current value of the PFC circuit according to the AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage.
In the embodiment, when the PFC circuit is controlled, a dual-loop control method of a voltage loop and a current loop with feedforward control is generally adopted, that is, the PFC circuit is controlled in a dual-loop manner, where an input of the current loop is an output of the voltage loop, and a minimum output value of the current loop control may be zero. The controller calculates and processes the collected AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage to obtain an instruction current value of the PFC circuit, namely a current loop control output value, and the PFC circuit is protected and controlled by detecting the instruction current value of the PFC circuit.
And S3, determining that the command current value is less than or equal to the preset current value.
In the embodiment, when the load connected with the PFC circuit is suddenly reduced, the amount of the electrolytic capacitor consumed by the load is reduced, and the dc bus voltage is increased to some extent due to the boost function of the PFC circuit, at this time, the control output value of the PFC voltage loop is rapidly reduced, and the control output value of the current loop is also reduced, and the minimum value can be reduced to zero. Wherein the current loop controls the output value, i.e. the commanded current value.
The method includes the steps that a preset current value is set to be zero, after the PFC circuit is started, an instruction current value of the PFC circuit is detected in real time, when the instruction current value is smaller than or equal to the preset current value, namely the instruction current value is determined to be smaller than or equal to zero, the load is considered to be reduced to be very low, and when the condition occurs, the sampling voltage of a direct current bus rises, and the PFC circuit needs to be protected.
And S4, controlling the PFC circuit to perform soft start.
When the PFC circuit is in soft start, the control voltage value is slowly increased from zero to the rated voltage, so that the starting current of the load in the starting process is changed from the fact that the overload impact current is uncontrollable in the past into a controllable value, the starting current can be adjusted according to the requirement, and no impact torque exists in the whole process of the soft start of the PFC circuit, so that the smooth start operation of the accessed load is ensured.
And controlling the PFC circuit to restart the soft start reset when the PFC circuit is in soft start, namely recovering to the initial soft start parameters and restarting the soft start. In the embodiment, when the PFC circuit is controlled to be in soft start, the duty ratio of the PFC circuit can be controlled, the soft start of the PFC circuit is completed, and the PFC circuit is protected according to the sampling voltage of the direct-current bus after the PFC circuit is in soft start.
Specifically, when the PFC circuit meets the soft start condition, the duty ratio of the PFC circuit can be controlled, the calculation method for controlling the duty ratio of the PFC circuit is optimized, and the PFC circuit is controlled to work according to the optimized calculation control method, so that the soft start of the PFC circuit is completed. After the PFC circuit is started softly, the sampling voltage of the direct current bus is detected in real time, when the situation that the load at the rear end is suddenly and suddenly reduced occurs, the sampling voltage of the direct current bus can be increased, and when the sampling voltage of the direct current bus is increased to meet the condition that the PFC circuit is closed, the controller controls the PFC circuit to be closed, so that the bus voltage is rapidly reduced, and the PFC circuit is protected.
According to the method for controlling the PFC circuit of the variable-frequency air conditioner, the instruction current value of the PFC circuit is obtained based on the obtained sampling voltage of the alternating-current power supply, the obtained sampling current of the alternating-current power supply and the obtained sampling voltage of the direct-current bus. When the load connected with the PFC circuit is suddenly reduced, the bus voltage is continuously increased, the command current value is suddenly reduced, the PFC circuit is directly controlled to be in soft start by setting the preset current value when the command current value is determined to be smaller than or equal to the preset current value, so that the bus voltage is quickly reduced, the condition that the use of a user is influenced by faults caused by overhigh bus voltage is avoided, the risk that the rear-end electrolytic capacitor is broken down caused by overhigh bus voltage can be reduced, and the protection of the PFC circuit and the safety control of the electrolytic capacitor are realized.
In the related art, when the load at the rear end is suddenly reduced, if the PFC circuit rapidly reduces the PWM (Pulse Width Modulation) duty ratio according to a normal control strategy, but since the load at the rear end is suddenly reduced to be very low, almost no energy stored in the electrolytic capacitor is consumed, in this case, even if the duty ratio is reduced in a following manner according to a normal logic, the bus voltage is continuously increased, and the PFC circuit is turned off until the condition that the PFC circuit is turned off is reached, so that the bus voltage can be reduced. In the whole process, the PFC circuit is used as a Boost (voltage boosting) booster circuit, voltage reduction control cannot be realized, too high bus voltage can cause the fault of the PFC circuit to influence the use of a user and influence the service life of a rear-end electrolytic capacitor,
in some embodiments of the present invention, as shown in fig. 3, a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the present invention is shown, wherein the PFC circuit is controlled to perform soft start, that is, the above step S4 includes step S41, which is described as follows.
And S41, controlling the PFC circuit to operate at a preset initial duty ratio, and controlling the duty ratio of the driving signal of the PFC circuit to be increased from the preset initial duty ratio to a target duty ratio within a preset time period.
In some embodiments of the present invention, an initial duty ratio is preset, after the PFC circuit meets a start condition for soft start, the PFC circuit is controlled to operate at the preset initial duty ratio, and the duty ratio of the driving signal of the PFC circuit is controlled to be increased from the preset initial duty ratio to a target duty ratio within a preset time period. The initial duty ratio and the target duty ratio can be obtained from operation big data or set under laboratory conditions.
Specifically, within a preset time period, the duty ratio of the driving signal of the PFC circuit is controlled to start linear increase from a preset initial duty ratio until a target duty ratio is reached, wherein the preset time period may be set as needed or under a laboratory condition to ensure that the duty ratio of the driving signal of the PFC circuit can be stably increased from the initial duty ratio to the target duty ratio. And after the PFC circuit is determined to reach the target duty ratio, controlling the duty ratio of the PFC circuit according to the control output value of the normal voltage feedforward control voltage loop and the control output value of the current loop.
In some embodiments of the present invention, as shown in fig. 4, a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the present invention is provided, wherein the method for controlling the PFC circuit of the inverter air conditioner includes steps 101 and 110, which are described in detail below.
101, start.
102, determining whether the PFC circuit is in soft start, if yes, executing step S103, and if no, executing step S107.
And 103, controlling the duty ratio of the PFC circuit to be increased from the preset initial duty ratio to the target duty ratio.
And 104, controlling the duty ratio of the PFC circuit by the voltage loop, the current loop and the voltage feedforward.
And 105, judging whether the duty ratio of the PFC circuit reaches the target duty ratio, if so, executing the step 106, and if not, ending the process.
106, soft start of PFC circuit is finished
And 107, controlling the duty ratio of the PFC circuit by the voltage loop, the current loop and the voltage feedforward.
And 108, controlling the PWM duty ratio.
According to the method for controlling the PFC circuit of the variable-frequency air conditioner, disclosed by the embodiment of the invention, the PFC circuit is controlled to work according to the optimized calculation control method under the condition that the rear-end load is suddenly reduced by optimizing the calculation method for controlling the duty ratio of the PFC circuit, the condition that the PFC circuit is closed is not required to be met, the voltage of a bus can be rapidly reduced, the overvoltage protection is prevented, and meanwhile, the service life of an electrolytic capacitor is not influenced.
In some embodiments of the present invention, as shown in fig. 5, it is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the present invention, wherein the PFC circuit is controlled to perform soft start, that is, the step S4 above further includes step S42, which is described as follows.
And S42, protecting the PFC circuit according to the DC bus sampling voltage.
The PFC circuit is a circuit with a boosting function, when the PFC circuit works, the voltage of the direct-current bus is boosted to a target voltage value, so that safe and reliable operation of the controller is guaranteed, the voltage of the direct-current bus is set to work below a limit value, and when the voltage of the direct-current bus exceeds the limit value, the PFC circuit needs to be closed or the variable-frequency air conditioner needs to be controlled to stop.
In the embodiment, the method includes the steps that a PFC circuit is controlled to obtain a DC bus sampling voltage in real time in a soft start process, the DC bus sampling voltage can rise when a rear-end load suddenly and suddenly decreases, and when the DC bus sampling voltage rises to meet a condition that the PFC circuit is closed, a controller controls the PFC circuit to be closed, so that the bus voltage is rapidly reduced, and the PFC circuit is protected.
In some embodiments of the present invention, as shown in fig. 6, it is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the present invention, wherein the PFC circuit is protected according to a dc bus sampling voltage, that is, the step S42 may include step S421 or step S422, as follows.
And S421, determining that the sampling voltage of the direct current bus is greater than a first voltage threshold value, controlling the variable frequency air conditioner to stop and carrying out fault alarm.
Wherein the first voltage threshold may be set to 400V. In the embodiment, in the control process of protecting the PFC circuit according to the sampling voltage of the direct current bus, the direct current bus voltage sampling circuit can be connected with the PFC circuit to collect the data of the filtered sampling voltage of the direct current bus, when the collected sampling voltage of the direct current bus is determined to be larger than a first voltage threshold value, the fault is determined to occur, the PFC circuit is immediately controlled to be closed, and the variable frequency air conditioner is controlled to be stopped and give an alarm.
S422, determining that the sampling voltage of the direct current bus is greater than a second voltage threshold value, and controlling the PFC circuit to be closed, wherein the second voltage threshold value is smaller than the first voltage threshold value.
The second voltage threshold may be set to 390V, and in the control process of protecting the PFC circuit according to the dc bus sampling voltage, when it is determined that the collected dc bus sampling voltage is greater than the second voltage threshold, the PFC circuit is controlled to be turned off.
In some embodiments of the present invention, as shown in fig. 7, a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to another embodiment of the present invention is shown, wherein the method for controlling the PFC circuit of the inverter air conditioner includes steps 201 and 207, which are described in detail below.
And 201, starting.
202, it is determined whether the command current value is equal to zero, if yes, step S203 is executed, and if no, step S204 is executed.
And 203, resetting the soft start parameters of the PFC circuit and restarting the soft start.
204, determining whether the dc bus sampling voltage is greater than the first voltage threshold, if yes, executing step S205, and if no, executing step S206.
205, the variable frequency air conditioner is shut down, faults are reported, and the operation is finished.
And 206, judging whether the sampling voltage of the direct current bus is larger than a second voltage threshold value, if so, executing the step S207, and if not, ending the operation.
207, the PFC circuit is turned off.
According to the method for controlling the PFC circuit of the variable frequency air conditioner, when the condition of shutting down the PFC circuit is determined to be met according to the collected sampling voltage of the direct current bus, the PFC circuit is controlled to be shut down or a shutdown well of the variable frequency air conditioner is controlled to perform fault alarm, so that the bus voltage is rapidly reduced, and overvoltage protection is realized.
In some embodiments of the present invention, as shown in fig. 8, the present invention is a block diagram of an apparatus for controlling a PFC circuit of an inverter air conditioner, wherein the apparatus 100 for controlling the PFC circuit of the inverter air conditioner includes a parameter obtaining module 101, an instruction current obtaining module 102, a determining module 103, and a control module 104.
The parameter obtaining module 101 is configured to obtain an ac power input voltage, an ac power input current, and a dc bus sampling voltage. The command current obtaining module 102 is configured to obtain a command current value of the PFC circuit according to the ac power input voltage, the ac power input current, and the dc bus sampling voltage. The determining module 103 is configured to determine that the command current value is less than or equal to a preset current value. The control module 104 is used for controlling the PFC circuit to perform soft start.
In an embodiment, after the parameter obtaining module 101 obtains the ac power input voltage, the ac power input current, and the dc bus sampling voltage, the instruction current obtaining module 102 calculates according to the obtained ac power input voltage, the ac power input current, and the dc bus sampling voltage to obtain an instruction current value of the PFC circuit, and sends the instruction current value to the determining module 103. The determination module 103 stores a preset current value, the determination module 103 compares the command current value with the preset current value, and when the command current value is determined to be less than or equal to the preset current value, the determination module 104 may send a signal to the control module 104, and the control module 104 is configured to control the PFC circuit to perform soft start.
According to the device 100 for controlling the PFC circuit of the variable-frequency air conditioner, the instruction current value of the PFC circuit is obtained according to the collected sampling voltage of the alternating-current power supply, the collected sampling current of the alternating-current power supply and the collected sampling voltage of the direct-current bus based on the frameworks of the parameter obtaining module 101, the instruction current obtaining module 102 and the determining module 103. When the load suddenly changes, the command current value is reduced, and the bus voltage is increased. When the command current value is determined to be smaller than or equal to the preset current value, the control module 104 directly controls the PFC circuit to perform soft start, so that the bus voltage is rapidly reduced, the influence of faults caused by overhigh bus voltage on the use of a user is avoided, the risk of breakdown of the rear-end electrolytic capacitor caused by overhigh bus voltage can also be reduced, and the PFC circuit is protected and the electrolytic capacitor is safely controlled.
An inverter air conditioner according to a third aspect of the present invention will be described with reference to fig. 9 to 11. Fig. 9 is a block diagram of an inverter air conditioner according to an embodiment of the present invention.
The variable frequency air conditioner 10 comprises a rectification circuit 1, a PFC circuit 2, an alternating current voltage sampling circuit 3, an alternating current sampling circuit 4, a direct current bus voltage sampling circuit 5 and a controller 6.
The input end of the rectifying circuit 1 is connected with an alternating current power supply U, and the rectifying circuit 1 is used for rectifying alternating current input by the alternating current power supply U. The input end of the PFC circuit 2 is connected with the output end of the rectification circuit 1. The PFC circuit 2 has a function of power factor correction, and power correction of an ac input current and a dc bus voltage flowing into a load can be realized by setting the PFC circuit, so as to provide a reliable ac input current and a reliable dc bus voltage for the load.
The alternating voltage sampling circuit 3 is connected with the input end of the rectification circuit 1 and is used for detecting the sampling voltage of the alternating current power supply. And the alternating current sampling circuit 4 is connected with the output end of the PFC circuit 2 and is used for detecting the sampling current of the alternating current power supply. And the direct current bus voltage sampling circuit 5 is connected with the output end of the PFC circuit 2 and is used for collecting direct current bus sampling voltage.
The controller 6 is connected with the alternating voltage sampling circuit 3, the alternating current sampling circuit 4 and the direct current bus voltage sampling circuit 5 respectively, and is used for controlling the PFC circuit 2 according to the method for controlling the PFC circuit of the variable frequency air conditioner in any one embodiment.
Specifically, the controller 6 controls the PFC circuit 2 to operate according to the operating condition of the control load, the ac voltage sampling circuit 3, the ac current sampling circuit 4 and the dc bus voltage sampling circuit 5 input the collected ac power sampling voltage, the collected ac power sampling current and the collected dc bus sampling voltage into the controller 6, the controller 6 obtains an instruction current value of the PFC circuit 2 according to the obtained ac power sampling voltage, the collected ac power sampling current and the collected dc bus sampling voltage, compares the instruction current value with a preset current value, and controls the PFC circuit 2 to perform soft start when the instruction current value is determined to be less than or equal to the preset current value.
According to the variable frequency air conditioner 10 of the embodiment of the invention, the alternating current voltage sampling circuit 3, the alternating current sampling circuit 4 and the direct current bus voltage sampling circuit 5 respectively send the collected alternating current power supply sampling voltage, the alternating current power supply sampling current and the direct current bus sampling voltage to the controller, the controller 6 controls the running state of the PFC circuit 2 based on the obtained alternating current power supply sampling voltage, the alternating current power supply sampling current and the direct current bus sampling voltage, the variable frequency air conditioner 10 of the invention does not change the cost based on the architectures of the rectification circuit 1, the PFC circuit 2, the alternating current voltage sampling circuit 3, the alternating current sampling circuit 4, the direct current bus voltage sampling circuit 5 and the controller 6, the control method of the PFC circuit 2 is optimized by executing the method for controlling the PFC circuit of the variable frequency air conditioner of the first aspect, and under the condition that the load at the rear end is sharply reduced, the PFC circuit 2 can be controlled to work according to the optimized calculation control method, so that the bus voltage can be rapidly reduced, overvoltage protection is prevented, and the service life of the electrolytic capacitor is not influenced.
In some embodiments of the present invention, as shown in fig. 10, a schematic diagram of a PFC circuit according to an embodiment of the present invention is shown, wherein the PFC circuit 2 includes an inductor L1, a PFC driver circuit 21, an IGBT module 22, a diode D1, and an electrolytic capacitor C1.
A first end of the inductor L1 is connected to a first output end of the rectifier circuit 1, and an input end of the PFC driver circuit 21 is connected to the controller 6. The controller 6 may control the operating state of the PFC circuit 2 based on the acquired ac power supply sampling voltage, ac power supply sampling current, and dc bus sampling voltage. The controller 6 may send a PWM signal to the PFC driving circuit 21 to control the operation of the PFC circuit 2.
The IGBT module 22 may be configured as a power device IGBT, a first end, i.e., a g end, of the IGBT module 22 is connected to the output end of the PFC driving circuit 21, a second end, i.e., a C end, of the IGBT module 22 is connected to a second end of the inductor L1, and a third end, i.e., an E end, of the IGBT module 22 is connected to the ac current sampling circuit 4 and the dc bus voltage sampling circuit 5, respectively.
The anode of the diode D1 is connected to the second end of the IGBT module 22, and the cathode of the diode D1 is connected to the dc bus voltage sampling circuit. A first terminal of the electrolytic capacitor C1 is connected to the cathode of the diode, and a second terminal of the electrolytic capacitor C1 is connected to the third terminal of the IGBT module 22.
In some embodiments of the present invention, as shown in fig. 11, which is a schematic diagram of an inverter air conditioner according to an embodiment of the present invention, wherein the inverter air conditioner 10 according to an embodiment of the present invention may adopt a general PFC control topology, the ac voltage sampling circuit 3 is connected to an output end of the rectification circuit 1, and is configured to collect an ac power supply sampling voltage input to the PFC circuit 2 and send the ac power supply sampling voltage to the controller 6, and when the whole machine works, the controller 6 generates a PWM signal according to the ac input voltage to the PFC driving circuit 21 to control the PFC circuit 2 to work. The alternating current sampling circuit 4 is connected with the resistor R and the output end of the IGBT module 22, and sends the collected alternating current power supply sampling current to the controller 6. The direct current bus voltage sampling circuit 5 is connected with a direct current bus and an electrolytic capacitor C1, the collected direct current bus sampling voltage is sent to the controller 6, the controller 6 obtains an instruction current value of the PFC circuit 2 according to the obtained alternating current power supply sampling voltage, the obtained alternating current power supply sampling current and the obtained direct current bus sampling voltage, compares the instruction current value with a preset current value, and controls the PFC circuit 2 to perform soft start when the instruction current value is determined to be smaller than or equal to the preset current value.
In some embodiments of the present invention, a non-transitory computer-readable storage medium is also provided, on which a computer program is stored, and the computer program, when executed by a processor, implements the method for controlling the PFC circuit of the inverter air conditioner of any one of the above embodiments.
According to the computer-readable storage medium of the embodiment of the invention, a computer program is stored on the storage medium, when the computer program is executed, the computer program can read instructions and obtain operation parameters of all components in the inverter air conditioner, and the operation parameters and the like are calculated and processed, and the operation states of all the components in the inverter air conditioner are memorized, so that the method for controlling the PFC circuit of the inverter air conditioner can be realized, and under the condition that the rear-end load is suddenly reduced, the bus voltage can be quickly reduced, so that the PFC circuit can be protected, and the service life of the electrolytic capacitor is not influenced.
Other constructions and operations of the inverter air conditioner 10 and the PFC circuit 2 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A method for controlling a PFC circuit of a variable frequency air conditioner is characterized by comprising the following steps:
acquiring alternating current power supply sampling voltage, alternating current power supply sampling current and direct current bus sampling voltage;
obtaining the instruction current value of the PFC circuit according to the AC power supply sampling voltage, the AC power supply sampling current and the DC bus sampling voltage;
determining that the command current value is less than or equal to a preset current value;
and controlling the PFC circuit to perform soft start.
2. The method for controlling the PFC circuit of the inverter air conditioner of claim 1, wherein the preset current value is zero.
3. The method for controlling the PFC circuit of the inverter air conditioner according to claim 1 or 2, wherein the controlling the PFC circuit to perform soft start comprises:
and controlling the PFC circuit to operate at a preset initial duty ratio, and controlling the duty ratio of a driving signal of the PFC circuit to be increased from the preset initial duty ratio to a target duty ratio within a preset time period.
4. The method for controlling the PFC circuit of the variable frequency air conditioner according to claim 3, wherein controlling the duty cycle of the driving signal of the PFC circuit to be increased from the preset initial duty cycle to a target duty cycle within a preset time period comprises:
and within a preset time length, controlling the duty ratio of a driving signal of the PFC circuit to be linearly increased from the preset initial duty ratio until the target duty ratio is reached.
5. The method for controlling the PFC circuit of the inverter air conditioner according to claim 1, wherein after controlling the PFC circuit to perform soft start, the method further comprises:
and protecting the PFC circuit according to the sampling voltage of the direct current bus.
6. The method for controlling the PFC circuit of the inverter air conditioner according to claim 5, wherein the protecting the PFC circuit according to the DC bus sampling voltage comprises:
determining that the sampling voltage of the direct current bus is greater than a first voltage threshold value, controlling the variable frequency air conditioner to stop and carrying out fault alarm;
or determining that the sampling voltage of the direct current bus is greater than a second voltage threshold value, and controlling the PFC circuit to be closed, wherein the second voltage threshold value is smaller than the first voltage threshold value.
7. The utility model provides a device of control inverter air conditioner PFC circuit which characterized in that includes:
the parameter acquisition module is used for acquiring alternating current power supply input voltage, alternating current power supply input current and direct current bus sampling voltage;
the instruction current obtaining module is used for obtaining an instruction current value of the PFC circuit according to the alternating-current power supply input voltage, the alternating-current power supply input current and the direct-current bus sampling voltage;
the determining module is used for determining that the instruction current value is less than or equal to a preset current value;
and the control module is used for controlling the PFC circuit to carry out soft start.
8. The utility model provides a variable frequency air conditioner which characterized in that includes:
the input end of the rectifying circuit is connected with an alternating current power supply;
the input end of the PFC circuit is connected with the output end of the rectification circuit;
the alternating voltage sampling circuit is connected with the input end of the rectifying circuit and is used for detecting the sampling voltage of the alternating power supply;
the alternating current sampling circuit is connected with the output end of the PFC circuit and is used for detecting the sampling current of the alternating current power supply;
the direct current bus voltage sampling circuit is connected with the output end of the PFC circuit and is used for collecting direct current bus sampling voltage;
the controller is respectively connected with the alternating-current voltage sampling circuit, the alternating-current sampling circuit and the direct-current bus voltage sampling circuit and is used for controlling the PFC circuit of the variable-frequency air conditioner according to the method for controlling the PFC circuit of any one of claims 1-6.
9. The inverter air conditioner of claim 8, wherein the PFC circuit comprises:
the first end of the inductor is connected with the first output end of the rectifying circuit;
the input end of the PFC driving circuit is connected with the controller;
the first end of the IGBT module is connected with the output end of the PFC driving circuit, the second end of the IGBT module is connected with the second end of the inductor, and the third end of the IGBT module is respectively connected with the alternating current sampling circuit and the direct current bus voltage sampling circuit;
the anode of the diode is connected with the second end of the IGBT module, and the cathode of the diode is connected with the direct-current bus voltage sampling circuit;
and a first end of the electrolytic capacitor is connected with the cathode of the diode, and a second end of the electrolytic capacitor is connected with a third end of the IGBT module.
10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method of controlling a PFC circuit of a variable frequency air conditioner of any one of claims 1-6.
CN202110841841.5A 2021-07-26 2021-07-26 Method and device for controlling PFC circuit of variable-frequency air conditioner, air conditioner and storage medium Active CN113612378B (en)

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CN108075633A (en) * 2017-11-23 2018-05-25 珠海格力节能环保制冷技术研究中心有限公司 Soft-start method, device, circuit and the electric appliance of circuit of power factor correction
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