CN113162395A - PFC (power factor correction) control method and device of variable frequency air conditioner and variable frequency air conditioner - Google Patents

PFC (power factor correction) control method and device of variable frequency air conditioner and variable frequency air conditioner Download PDF

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Publication number
CN113162395A
CN113162395A CN202110504301.8A CN202110504301A CN113162395A CN 113162395 A CN113162395 A CN 113162395A CN 202110504301 A CN202110504301 A CN 202110504301A CN 113162395 A CN113162395 A CN 113162395A
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current
value
air conditioner
frequency
limit
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CN113162395B (en
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牟宗娥
高思云
牛建勇
葛甜
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • 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
    • 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)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a PFC (power factor correction) control method and device of a variable frequency air conditioner and the variable frequency air conditioner, wherein the PFC control method of the variable frequency air conditioner comprises the following steps of: acquiring the voltage of a direct current bus of a PFC circuit; determining that the voltage of the direct current bus meets the open circuit condition control condition of the PFC circuit; acquiring alternating current input current of a PFC circuit; calculating the current effective value of the alternating current input current, and acquiring the current peak value of the alternating current input current; and controlling the working state of the variable frequency air conditioner according to the current effective value and the current peak value. The PFC control method of the variable frequency air conditioner controls the whole machine to operate without stopping when a PFC circuit has a fault or a signal detection is abnormal, does not trigger current peak protection, protects circuit devices and ensures the use feeling of a user.

Description

PFC (power factor correction) control method and device of variable frequency air conditioner and variable frequency air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a PFC (Power Factor Correction) control method and device of a variable frequency air conditioner and the variable frequency air conditioner.
Background
In order to improve the utilization rate of the power supply energy of the inverter air conditioner and reduce the harmonic pollution to the power grid, a PFC circuit is generally arranged in the inverter air conditioner, has a power factor correction function, can greatly improve the power factor of the whole inverter air conditioner, and provides reliable direct-current voltage for the inverter load compressor. The main control MCU samples the AC input voltage and controls the PFC circuit to work. As shown in fig. 1, a schematic diagram of a PFC circuit is shown, in which a PWM (Pulse Width Modulation) signal is generated according to an ac input voltage and is provided to a PFC driving circuit to control the PFC circuit to operate. And the master control MCU detects the voltage of the direct current bus at the same time, and when the voltage of the direct current bus is the same as the target voltage of the master control MCU, the PFC control circuit is normal. When the whole machine normally works, the main control MCU detects the instantaneous value of the alternating current input current in real time, calculates the effective value of the alternating current input current according to the root-mean-square definition of the effective value of the current, and controls the whole machine to work according to the effective value of the current. When the PFC circuit works, the power device IGBT is in a high-frequency switching state, the heating of the power device IGBT, the inductor L, the diode D, the capacitor C and other devices is also higher, along with the extension of the working time of the whole machine or the PFC circuit and the reason of lightning stroke in the nature and the like, the service life of the power device IGBT can be reduced, the risk that the device is damaged and broken and cannot work exists, when the IGBT is broken and damaged or the PFC circuit is broken, the main control MCU detects that the voltage of a direct-current bus is not increased to the voltage value of the expected design and only the voltage value of the rectified alternating-current input current is reached, at the moment, the main control MCU can identify the abnormity of the PFC circuit, control the whole machine to stop working and report faults, and influence the use of users.
In order not to influence the use of a user, when the IGBT is damaged or the PFC circuit is broken, the main control MCU recognizes that the PFC circuit is abnormal, the power factor of the whole machine is reduced and harmonic pollution to a power grid is used as a sacrifice, and the whole machine cannot be stopped but continues to work.
In the related technology, when the PFC circuit fails, the complete machine is continuously operated in consideration of convenience for a user, the main control MCU still adopts a calculation method of an effective value for the ac input current, which may result in a relatively high peak value of the ac input current, and there is a risk that the peak current may break down devices on the control board to cause device damage, and meanwhile, when the ac input current peak value is too high to exceed a current peak protection value set by the hardware circuit of the main control board, frequent shutdown and fault reporting may be caused, which also affects the user's use.
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 PFC control method for a variable frequency air conditioner, which controls the entire machine to operate without stopping when a PFC circuit is abnormal, and does not trigger current peak protection, protect circuit devices, and ensure user experience.
The second objective of the present invention is to provide a PFC circuit control device.
The present invention also provides an inverter air conditioner.
In order to achieve the above object, a PFC control method for an inverter air conditioner according to an embodiment of a first aspect of the present invention includes: acquiring the voltage of a direct current bus of a PFC circuit; determining that the direct current bus voltage meets the open circuit condition control condition of the PFC circuit; acquiring alternating current input current of the PFC circuit; calculating the current effective value of the alternating current input current, and acquiring the current peak value of the alternating current input current; and controlling the working state of the variable frequency air conditioner according to the current effective value and the current peak value.
According to the PFC control method of the variable frequency air conditioner, the direct current bus voltage of the PFC circuit is obtained, when the fact that the whole machine meets the control condition of the open circuit condition of the PFC circuit is determined according to the direct current bus voltage, the working state of the variable frequency air conditioner is controlled based on the current effective value and the current peak value, namely when the PFC circuit is in fault or the signal detection is abnormal, the variable frequency air conditioner is not directly controlled to stop, the working state of the variable frequency air conditioner is controlled by comprehensively considering the current effective value and the current peak value, the indoor environment discomfort caused by direct stop is avoided, the current peak value protection cannot be triggered, devices can be effectively prevented from being damaged by overlarge current peak values, the reliable operation and protection of the whole machine are achieved, and the use feeling of a user is guaranteed.
In some embodiments of the present invention, determining that the dc bus voltage satisfies an open circuit condition control condition of the PFC circuit comprises: the direct current bus voltage meets at least one of the following conditions, and the direct current bus voltage is determined to meet the open circuit condition control condition of the PFC circuit: the direct current bus voltage is a voltage value obtained by directly rectifying the alternating current input voltage of the PFC circuit; the direct current bus voltage is smaller than the direct current bus voltage value when the PFC circuit operates normally; and obtaining the direct current bus voltage.
In some embodiments of the present invention, controlling the operating state of the inverter air conditioner according to the current effective value and the current peak value includes: acquiring a current effective value limit value and a current peak value limit value; and controlling the working state of the variable-frequency air conditioner according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value.
In some embodiments of the present invention, the current effective value limit comprises a current effective value disable-raise-frequency limit, a current effective value lower-frequency limit, and a current effective value-stop limit, and the current peak limit comprises a current peak value disable-raise-frequency limit, a current peak value lower-frequency limit, and a current peak value stop-stop limit, wherein the current effective value stop-stop limit > the current effective value lower-frequency limit > the current effective value disable-raise-frequency limit, and the current peak stop-stop limit > the current peak value lower-frequency limit > the current peak value disable-raise-frequency limit; controlling the working state of the inverter air conditioner according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value, and the method comprises the following steps: and determining that the current effective value is smaller than the current effective value forbidden frequency rising limit value and the current peak value is smaller than the current peak forbidden frequency rising limit value, and controlling the frequency conversion air conditioner to normally work.
In some embodiments of the present invention, the controlling the working state of the inverter air conditioner according to the comparison result between the effective current value and the effective current value limit value and the comparison result between the peak current value and the peak current value limit value further includes: determining that the current effective value is smaller than the current effective value forbidden frequency rising limit value, and the current peak value is larger than or equal to the current peak value forbidden frequency rising limit value and smaller than the current peak value lower frequency falling limit value, and controlling the load of the variable frequency air conditioner to forbid frequency rising work; or determining that the current effective value is greater than or equal to the current effective value forbidden frequency rising limit value and smaller than the current effective value lower frequency rising limit value, and the current peak value is smaller than the current peak value forbidden frequency rising limit value, and controlling the load of the variable frequency air conditioner to forbid frequency rising work.
In some embodiments of the present invention, the controlling the working state of the inverter air conditioner according to the comparison result between the effective current value and the effective current value limit value and the comparison result between the peak current value and the peak current value limit value further includes: determining that the current effective value is smaller than the current effective value and the frequency-rise prohibiting limit value, and the current peak value is greater than or equal to the current peak value frequency-fall limit value and smaller than the current peak value shutdown limit value, and controlling the load frequency-reduction work of the frequency conversion air conditioner; or determining that the current effective value is greater than or equal to the current effective value lower frequency limit and less than the current effective value shutdown limit, and the current peak value is less than the current peak value forbidden frequency increase limit, and controlling the load of the variable frequency air conditioner to work in a frequency reduction mode.
In some embodiments of the present invention, the controlling the working state of the inverter air conditioner according to the comparison result between the effective current value and the effective current value limit value and the comparison result between the peak current value and the peak current value limit value further includes: determining that the current effective value is smaller than the current effective value and the frequency-rise-forbidden limit value, and the current peak value is larger than or equal to the current peak value stop limit value, and controlling the frequency-variable air conditioner to stop; or determining that the current effective value is greater than or equal to the current effective value shutdown limit value, and the current peak value is smaller than the current peak value forbidden ascending frequency limit value, and controlling the variable frequency air conditioner to be shut down.
In some embodiments of the invention, after determining that the dc bus voltage satisfies the open circuit condition control condition of the PFC circuit, the method further comprises: and prompting the fault of the PFC circuit.
In order to achieve the above object, a PFC circuit control apparatus according to an embodiment of a second aspect of the present invention includes: the direct current bus voltage acquisition unit is used for acquiring the direct current bus voltage of the PFC circuit; the alternating voltage acquisition unit is used for acquiring alternating input voltage of the PFC circuit; the alternating current acquisition unit is used for acquiring alternating input current of the PFC circuit; and the control unit is connected with the direct current bus voltage acquisition unit, the alternating current voltage acquisition unit and the alternating current acquisition unit and is used for executing the PFC control method of the variable frequency air conditioner as claimed in any one of the above embodiments.
According to the PFC circuit control device of the embodiment of the invention, the PFC control method of the variable frequency air conditioner of the embodiment is executed, the control unit judges the open circuit condition of the PFC circuit according to the DC bus voltage acquired by the DC bus voltage acquisition unit and the AC bus voltage acquired by the AC voltage acquisition unit, and when the DC bus voltage acquisition unit fails when the PFC circuit fails or the signal detection is abnormal, the working state of the variable frequency air conditioner is controlled based on the AC input current acquired by the AC voltage acquisition unit and the AC current acquisition unit. The circuit hardware structure does not need to be changed, and through software control, when a PFC circuit fault or a signal detection is abnormal, the frequency conversion air conditioner is not directly controlled to stop, but the working state of the frequency conversion air conditioner is controlled by comprehensively considering a current effective value and a current peak value, so that the indoor environment is not uncomfortable due to direct stop, the current peak value protection cannot be triggered, the current peak value can be effectively prevented from damaging devices, the reliable operation and protection of the whole machine are realized, and the use feeling of a user is ensured.
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 air conditioner comprises an air conditioner body and a PFC circuit; the PFC circuit control device according to the above embodiment is connected to the PFC circuit.
The inverter air conditioner according to the embodiment of the invention adopts the PFC circuit control device of the above embodiment, and executes the PFC control method of the inverter air conditioner of the above embodiment, and when the PFC circuit is in failure, a control unit in the PFC circuit control device controls the working state of the inverter air conditioner based on the AC input current. The hardware structure of the circuit does not need to be changed, and the whole machine is controlled to work without stopping under the control of software when a PFC circuit fails or a direct current bus voltage acquisition unit fails, so that the device can be effectively prevented from being damaged by a current peak value, the reliable operation and protection of the whole machine are realized, and the use feeling of a user is ensured.
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 schematic diagram of a PFC circuit;
FIG. 2 is a waveform diagram of AC input voltage and AC input current versus time for normal operation of the PFC circuit;
FIG. 3 is a waveform diagram of AC input voltage and AC input current versus time for a fault in a PFC circuit;
FIG. 4 is a flowchart illustrating a PFC control method of an inverter air conditioner according to an embodiment of the invention;
FIG. 5 is a flowchart illustrating a PFC control method of an inverter air conditioner according to another embodiment of the invention;
FIG. 6 is a flowchart illustrating a PFC control method of an inverter air conditioner according to another embodiment of the invention;
fig. 7 is a flowchart of a method of determining an abnormality in a PFC circuit according to one embodiment of the present invention;
FIG. 8 is a flow chart of a method of performing AC input current protection in an abnormal state of a circuit in accordance with one embodiment of the present invention;
fig. 9 is a block diagram of a PFC circuit control apparatus according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a PFC circuit control apparatus according to an embodiment of the present invention;
fig. 11 is a block diagram of an inverter air conditioner according to an embodiment of the present invention.
Reference numerals:
in the related art:
power device IGBT, inductance L, diode D, electric capacity C.
In the present invention:
a variable frequency air conditioner 100;
a PFC circuit control device 10, an air conditioner body 20 and a PFC circuit 30;
the device comprises a direct current bus voltage acquisition unit 1, an alternating current voltage acquisition unit 2, an alternating current acquisition unit 3 and a control unit 4.
Alternating current power supply U, power device IGBT1, resistance R, inductance L1, diode D1, electric capacity C1.
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.
After the inverter air conditioner adopts the PFC circuit, the power factor of the whole machine can be greatly improved, and a reliable direct current voltage is provided for the inverter load compressor, under the condition that the PFC circuit normally works, as shown in fig. 2, the inverter air conditioner is a waveform diagram of the relationship between an alternating current input voltage and an alternating current input current and time when the PFC circuit normally works, wherein a curve a represents an alternating current input voltage waveform when the PFC circuit normally works, a curve B represents an alternating current input current waveform when the PFC circuit normally works, Vpeak represents an alternating current input voltage peak value, Ipeak represents an alternating current input current peak value, the alternating current input current waveform and the alternating current input voltage waveform are both sine waves, and the phase of the alternating current input current waveform is consistent with the phase of the input alternating current voltage waveform.
When the PFC circuit fails, the ac input current peak value increases, as shown in fig. 3, which is a waveform diagram of the ac input voltage and the ac input current when the PFC circuit fails, wherein a curve a1 represents the ac input voltage waveform when the PFC circuit fails, a curve B1 represents the ac input current waveform when the PFC circuit fails, and Ipeak represents the ac input current peak value when the PFC circuit fails. At the moment, current is input into the whole machine only near the wave crest and the wave trough of the alternating current power supply, but the working capacity requirement of the whole machine is the same, namely the current effective value requirement of the alternating current input current to the whole machine is the same, under the condition that the main control MCU still calculates according to the input current effective value, the alternating current input current at the wave crest and the wave trough of the alternating current input voltage of the power supply is very large, especially the current peak value is higher, devices on a control panel can be punctured due to overhigh peak current, the risk of device damage is caused, and meanwhile, when the alternating current input current peak value is too high to exceed the current peak value protection value set by a hardware circuit of the main control panel, frequent shutdown and fault reporting can be caused, so that the use of a user is influenced.
In order to solve the problem of shutdown protection caused by relatively high peak value of alternating current input current caused by continuous operation of the whole inverter air conditioner when a PFC circuit is abnormal, the embodiment of the invention provides a PFC control method and a PFC control device of the inverter air conditioner and the inverter 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.
The PFC control method of the inverter air conditioner according to an embodiment of the present invention is described below with reference to fig. 4 to 8. It should be noted that the step numbers in the present application, such as S1, S2 … S4, S5, 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 … S4, S5, 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. 4, a flowchart of a PFC control method for an inverter air conditioner according to an embodiment of the present invention is shown, where the PFC control method for the inverter air conditioner at least includes steps S1-S5, which are described as follows.
And S1, acquiring the direct current bus voltage of the PFC circuit.
When the whole machine works, the control unit such as the main control MCU controls the PFC circuit to work according to the running condition of a load such as a compressor, the direct current bus voltage acquisition unit can be arranged to be used for acquiring the direct current bus voltage of the PFC circuit, and the direct current bus voltage acquisition unit is connected with the main control module so as to send the acquired direct current bus voltage of the PFC circuit to the control unit.
The control unit is used for comparing the acquired direct current bus voltage of the PFC circuit with the target value set by the control unit so as to detect the working state of the PFC circuit.
And S2, determining that the direct current bus voltage meets the open circuit condition control condition of the PFC circuit.
In some embodiments of the present invention, after receiving the dc bus voltage, the control unit may set a plurality of determination conditions based on the dc bus voltage to determine whether the open-circuit condition control condition of the PFC circuit is satisfied.
For example, the ac input voltage acquisition unit may be configured to acquire an ac input voltage, and when the dc bus voltage is a voltage value of the PFC circuit after the ac input voltage is directly rectified, or the dc bus voltage is smaller than a dc bus voltage value of the PFC circuit during normal operation, or the dc bus voltage is not acquired, and when the dc bus voltage satisfies at least one condition, it is determined that the dc bus voltage satisfies a control condition of an open circuit condition of the PFC circuit, so as to perform protection operation of the PFC circuit under the open circuit condition, where the ac input voltage is denoted as Vac, and the voltage value of the ac input voltage after rectification is denoted as Vdc.
Specifically, when the whole machine works, the control unit controls the PFC circuit to work, when the PFC circuit works, the bus voltage is increased to a preset target value, and meanwhile, when the detected direct current bus voltage does not reach the set target value but is equal to a voltage value Vdc obtained by directly rectifying the alternating current input voltage of the PFC circuit, namely Vdc ≈ Vac 1.414, the PFC circuit cannot perform power factor correction, and determines that the PFC circuit fails, thereby determining that the direct current bus voltage meets the open circuit condition control condition of the PFC circuit. If the direct-current bus voltage detected by the control unit is smaller than the direct-current bus voltage value when the PFC circuit normally operates, or the control unit cannot detect the direct-current bus voltage, determining that a circuit for collecting the direct-current bus voltage fails, determining that the working condition also meets the open circuit condition control condition of the PFC circuit by the complete machine, and entering a control method under the open circuit condition of the PFC circuit by the control unit.
And S3, acquiring the alternating current input current of the PFC circuit.
In an embodiment, the ac current collecting unit may be configured to detect an ac input current of the PFC circuit in real time, that is, an instantaneous value of the ac input current, and the ac current collecting unit is connected to the main control module to send the collected ac input current of the PFC circuit to the control unit.
And S4, calculating the current effective value of the alternating input current and acquiring the current peak value of the alternating input current.
In an embodiment, after receiving the ac input current of the PFC circuit, the control unit calculates the current effective value of the ac input current according to the root mean square definition of the current effective value, based on the instantaneous value of the ac input current.
The control unit calculates the current effective value of the alternating current input current and simultaneously collects the current peak value of the alternating current input current in real time. The current peak value of the alternating current input current can be obtained by adopting a hardware comparison circuit, the hardware protection value of the current peak value is also fixed under the condition that the circuit parameters are determined, when the current peak value is increased to be equal to the hardware protection value of the current peak value, the current peak value protection is triggered, and the whole machine can be shut down and report faults.
And S5, controlling the working state of the inverter air conditioner according to the current effective value and the current peak value.
In some embodiments of the present invention, a PFC circuit shutdown control strategy is set that takes into account both the current rms and the current peak. When the open circuit condition control condition of the PFC circuit is met, the control unit executes control logic under the open circuit condition of the PFC circuit. Wherein the control unit determines a current peak limit value of the appropriate alternating input current according to the current-withstanding value of the actual power device. The control unit stores a preset current effective value limit value of the alternating current input current, and compares the acquired current peak value with a current peak value limit value set by the main control MCU, for example, the main control MCU judges that the current effective value of the alternating current input current needs to be adjusted according to the comparison condition of the current effective value and the current effective value limit value, and judges that the current peak value of the alternating current input current needs to be adjusted according to the comparison condition of the current peak value and the current peak value limit value. The current effective value and the current peak value are always controlled to be in a safe range, the current peak value protection cannot be triggered, the complete machine is guaranteed not to stop working, and meanwhile the current peak value cannot damage circuit devices, so that the use feeling of a user is guaranteed.
According to the PFC control method of the variable frequency air conditioner, the direct current bus voltage of the PFC circuit is obtained, when the fact that the whole machine meets the control condition of the open circuit condition of the PFC circuit is determined according to the direct current bus voltage, the working state of the variable frequency air conditioner is controlled based on the current effective value and the current peak value, namely when the PFC circuit is in fault or the signal detection is abnormal, the variable frequency air conditioner is not directly controlled to stop, the working state of the variable frequency air conditioner is controlled by comprehensively considering the current effective value and the current peak value, the indoor environment discomfort caused by direct stop is avoided, the current peak value protection cannot be triggered, devices can be effectively prevented from being damaged by overlarge current peak values, the reliable operation and protection of the whole machine are achieved, and the use feeling of a user is guaranteed.
In some embodiments of the present invention, as shown in fig. 5, a flowchart of a PFC control method for an inverter air conditioner according to another embodiment of the present invention is shown, wherein the step S5 of controlling the operating state of the inverter air conditioner according to the current effective value and the current peak value may include steps S51 and S52, which are described in detail below.
And S51, acquiring a current effective value limit value and a current peak value limit value.
In the embodiment, the control unit stores a preset current effective value limit value of the alternating current input current, the current effective value limit value comprises a current effective value forbidden increasing frequency limit value, a current effective value decreasing frequency limit value and a current effective value stopping frequency limit value, the current effective value stopping frequency limit value is greater than the current effective value decreasing frequency limit value and is greater than the current effective value forbidden increasing frequency limit value, and the current effective value limit value can be adjusted by the control unit according to the running state of the air conditioner load.
After entering the control logic under the condition of open circuit of the PFC circuit, the control unit acquires the current effective value and the current peak value and determines the current peak value limiting value of the appropriate alternating input current according to the current resistance value of the actual power device. The current peak limit value comprises a current peak forbidden rising frequency limit value, a current peak frequency reduction limit value and a current peak stopping limit value, and the current peak stopping limit value is larger than the current peak frequency reduction limit value and larger than the current peak forbidden rising frequency limit value.
And S52, controlling the working state of the variable frequency air conditioner according to the comparison result of the effective current value and the effective current value limit value and the comparison result of the current peak value and the current peak value limit value.
In some embodiments of the present invention, the control unit compares the obtained current effective value with a preset current effective value limit value, the control unit determines that the current effective value of the ac input current needs to be adjusted according to the comparison condition between the current effective value and the current effective value limit value, and the control unit compares the current peak value with the current peak value limit value, determines that the current peak value of the ac input current needs to be adjusted according to the comparison condition between the current peak value and the current peak value limit value, and executes a control logic under the condition of the open circuit of the PFC circuit.
For example, when the current effective value or the current peak value is determined to be beyond the safety range, the whole machine is triggered to prohibit the frequency-increasing current, the load such as a frequency-variable compressor is controlled not to operate in a frequency-increasing mode any more, the current effective value and the current peak value are always controlled to be within the safety range, and the current peak value hardware protection value is not triggered. The current effective value and the current peak value are adjusted adaptively, so that the whole machine is ensured to work only in two working states of normal work and frequency-up work forbidding, the whole machine is ensured not to stop working, the current peak value cannot damage devices, and the reliable operation and protection of the whole machine are realized.
In some embodiments of the present invention, the step S52 of controlling the operating state of the inverter air conditioner according to the comparison result between the current effective value and the current effective value limit value and the comparison result between the current peak value and the current peak value limit value may include determining that the current effective value is smaller than the current effective value forbidden ascending frequency limit value and the current peak value is smaller than the current peak value forbidden ascending frequency limit value, and controlling the inverter air conditioner to operate normally, where the normal operation may be understood as being controlled according to the normal control logic of the inverter air conditioner.
When the current effective value is smaller than the current effective value and the current peak value is smaller than the current peak value and the frequency rising limit is forbidden, the current effective value and the current peak value both accord with the current requirement of the complete machine under a normal operation turntable, the current effective value and the current peak value are smaller and are in a normal range, at the moment, the PFC circuit does not break down, the complete machine is in a normal working state, and the current effective value and the current peak value do not need to be adjusted.
In some embodiments of the present invention, the method for controlling the operating state of the inverter air conditioner according to the comparison result between the effective current value and the effective current value limit value and the comparison result between the peak current value and the peak current value limit value further includes: and determining that the current effective value is smaller than the current effective value forbidden frequency rising limit value, and the current peak value is larger than or equal to the current peak value forbidden frequency rising limit value and smaller than the current peak value lower frequency limit value, and controlling the working state of the load of the variable frequency air conditioner to be a forbidden frequency rising working state. When the current effective value is smaller than the current effective value and is larger than or equal to the current peak value frequency-raising prohibiting limit and is smaller than the current peak value frequency-lowering limiting, the current effective value is smaller and is in a normal range, the current peak value is larger than or equal to the current peak value frequency-raising prohibiting limit, but the current peak value is still smaller than the current peak value frequency-lowering limiting, the current peak value is increased and still is in a safe range, the load is controlled not to perform frequency-raising operation any more if the frequency-changing compressor does not perform frequency-raising operation, the load of the frequency-changing air conditioner does not perform frequency-raising operation, and the current peak value is not adjusted any more.
Or, according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value, controlling the working state of the inverter air conditioner, further comprising: and determining that the current effective value is greater than or equal to the current effective value forbidden frequency rising limit value and smaller than the current effective value lower frequency falling limit value, and the current peak value is smaller than the current peak value forbidden frequency rising limit value, and controlling the working state of the load of the variable frequency air conditioner to be a forbidden frequency rising working state. When the current peak value is smaller than the current peak value forbidden increasing frequency limit value, and the current effective value is larger than or equal to the current effective value forbidden increasing frequency limit value and smaller than the current effective value decreasing frequency limit value, the current peak value is smaller and is in a normal range, the current effective value is larger than or equal to the current effective value forbidden increasing frequency limit value, but the current effective value is still smaller than the current effective value decreasing frequency limit value, the current effective value is increased but still is in a safe range, a load such as a variable frequency compressor is controlled not to run in an increasing frequency mode, the load of the variable frequency air conditioner is prevented from working in the increasing frequency mode, and the current peak value is not adjusted in the increasing frequency mode.
In some embodiments of the present invention, the method for controlling the operating state of the inverter air conditioner according to the comparison result between the effective current value and the effective current value limit value and the comparison result between the peak current value and the peak current value limit value further includes: and determining that the effective current value is smaller than the forbidden frequency increasing limit value of the effective current value, and the current peak value is greater than or equal to the current peak value frequency decreasing limit value and smaller than the current peak value stop limit value, and controlling the working state of the load of the variable frequency air conditioner to be a frequency decreasing working state. When the current effective value is smaller than the current effective value and is larger than or equal to the current peak value lower frequency limit and smaller than the current peak value stop limit, the current effective value is smaller and is in a normal range, the current peak value is increased and is larger than or equal to the current peak value lower frequency limit and exceeds a safety range, but the current peak value is smaller than the current peak value stop limit at the moment, the variable frequency air conditioner cannot stop, the risk of triggering a hardware current peak value protection value is realized, the heating of devices in the circuit is higher and the risk of breakdown is existed at the moment, the current peak value frequency is reduced to the safety range, the load of the variable frequency air conditioner is controlled to be converted from the lower frequency operation to the lower frequency operation, the devices in the circuit are prevented from being damaged, the whole machine is controlled to operate in a normal working state or a frequency raising forbidden working state, and the use feeling of a user is ensured.
Or, according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value, controlling the working state of the inverter air conditioner, further comprising: and determining that the current effective value is greater than or equal to the current effective value frequency reduction limit value and less than the current effective value shutdown limit value, and the current peak value is less than the current peak value frequency inhibition limit value, and controlling the working state of the load of the variable frequency air conditioner to be a frequency reduction working state. When the current peak value is smaller than the current peak value forbidden frequency rising limit value, and the current effective value is larger than or equal to the current effective value lower frequency limit value and smaller than the current effective value stop limit value, the current peak value is smaller and is in a normal range, the current effective value is increased and is larger than or equal to the current effective value lower frequency limit value and exceeds a safety range, but the current effective value is smaller than the current effective value stop limit value at the moment, the variable frequency air conditioner cannot stop, but the heating of devices in the circuit is higher and the risk of breakdown exists at the moment, the current effective value frequency is adjusted to a safety range, the load of the variable frequency air conditioner is controlled to be changed from the lower frequency operation to the forbidden frequency rising operation, the devices in the circuit are prevented from being damaged, the whole machine is controlled to operate in a normal working state or the forbidden frequency rising working state, and the use feeling of a user is ensured.
In some embodiments of the present invention, the method for controlling the operating state of the inverter air conditioner according to the comparison result between the effective current value and the effective current value limit value and the comparison result between the peak current value and the peak current value limit value further includes: and determining that the effective current value is smaller than the effective current value, forbidding the frequency rising limit value, and the current peak value is larger than or equal to the current peak value stopping limit value, and controlling the frequency conversion air conditioner to stop. When the current effective value is smaller than the current effective value, the frequency-increasing limit value is forbidden, and the current peak value is larger than or equal to the current peak value shutdown limit value, the current effective value is smaller and is in a normal range, but the current peak value is increased and is larger than or equal to the current peak value shutdown limit value, the current peak value exceeds a safe range, and the current peak value cannot be reduced to the safe range after being controlled to be frequency-reduced.
Or, according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value, controlling the working state of the inverter air conditioner, further comprising: and determining that the current effective value is greater than or equal to the current effective value shutdown limit value, and the current peak value is smaller than the current peak value forbidden ascending frequency limit value, and controlling the frequency conversion air conditioner to shut down. When the current peak value is smaller than the current peak value forbidden frequency increasing limit value and the current effective value is larger than or equal to the current effective value stopping limit value, the current peak value is smaller and is in a normal range, but the current effective value is increased and is larger than or equal to the current effective value stopping limit value and exceeds a safety range, and the current effective value cannot be reduced to the safety range after being controlled to reduce the frequency, so that the frequency modulation work on the current effective value is not executed at the moment in order to prevent the devices in the circuit from being damaged, and the frequency conversion air conditioner is stopped.
According to the PFC control method of the variable frequency air conditioner, the working state of the variable frequency air conditioner is controlled by obtaining the current effective value limit value and the current peak value limit value and according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value, the current effective value and the current peak value are monitored in real time, and after a PFC circuit fault or signal detection abnormity, the current effective value and the current peak value are adjusted in a safety range in real time, so that the whole machine is ensured to be only in two working states of normal working and frequency-up work prohibition, the whole machine is ensured not to stop working, the current peak value can be effectively prevented from damaging devices, and the whole machine is reliably operated and protected.
In some embodiments of the present invention, as shown in fig. 6, a flowchart of a PFC control method of an inverter air conditioner according to another embodiment of the present invention is shown, where after determining that the dc bus voltage meets the open circuit condition control condition of the PFC circuit, that is, after performing the above step S2, the method further includes step S21, which is described as follows.
And S21, prompting the fault of the PFC circuit.
In an embodiment, a reminding module may be provided for reminding a fault of the PFC circuit, wherein the reminding module may include a buzzer, a liquid crystal display, or the like, and may perform an audible alarm or a text prompt. After the direct-current bus voltage is determined to meet the open circuit condition control condition of the PFC circuit, the reminding module sends out reminding to inform a user that the fault of the PFC circuit needs to be checked or maintained.
In some embodiments of the present invention, as shown in fig. 7, a flowchart of a method for determining an abnormal PFC circuit according to an embodiment of the present invention is shown, wherein the method includes steps S101 to S109, which are described as follows.
S101, executing a starting process, wherein the response time of the whole machine is 1 ms.
And S102, judging whether an alarm threshold value obtained by subtracting the actual bus voltage from the command bus voltage and having the actual bus voltage higher than the command bus voltage and lower than the command bus voltage is met, wherein the alarm threshold value of the actual bus voltage lower than the command bus voltage can be set to be 35V, if the judgment result is 'yes', executing a step S103, and if the judgment result is 'no', executing a step S106.
And S103, adding 1 to the count of the alarm counter, and removing the count of the alarm counter to be 0.
And S104, judging whether the alarm counter technology is met or not, wherein the number of times of meeting the alarm condition is larger than the number of times of meeting the alarm condition, the number of times of meeting the alarm condition can be set to be 100, if the judgment result is yes, executing the step S105, and if the judgment result is no, ending the process.
And S105, executing the PFC circuit abnormity warning.
And S106, judging whether the command bus voltage is less than the actual bus voltage and the actual bus voltage is lower than the command bus voltage alarm release threshold value, wherein the actual bus voltage is lower than the command bus voltage alarm release threshold value and can be set to be 20V, if the judgment result is 'yes', executing the step S107, and if the judgment result is 'no', ending the process.
S107, the count of the alarm counter is 0, and the count of the alarm counter is cancelled and 1 is added.
And S108, judging whether the alarm counter technology is met or not, wherein the alarm condition releasing times can be set to 20, if the judgment result is yes, executing the step S109, and if the judgment result is no, ending the process.
And S109, not executing the PFC circuit abnormity warning.
In some embodiments of the present invention, the control unit compares the difference between the command bus voltage and the actual bus voltage with the sum of the difference between the command bus voltage and the actual bus voltage and the sum of the difference between the command bus voltage and the actual bus voltage with the difference between the command bus voltage and the actual bus voltage and the alarm release threshold of the command bus voltage, so as to determine the fault condition of the PFC circuit, and the fault condition of the PFC circuit is determined in time through software control.
In some embodiments of the present invention, as shown in fig. 8, a flowchart of a method for performing ac input current protection in an abnormal state of a circuit according to an embodiment of the present invention is provided, wherein the method includes steps S01-S05, which are described as follows.
S01, the flow starts
S02, it is determined whether or not the PFC circuit abnormality warning is present, and if the determination result is "yes", step S03 is executed, and if the determination result is "no", step S04 is executed.
And S03, determining the fault of the PFC circuit, and performing an overcurrent protection program according to the current peak value.
And S04, performing an overcurrent protection program according to the effective value of the current.
S05, the flow ends.
A PFC circuit control apparatus according to a second embodiment of the present invention is described below with reference to fig. 9 and 10. Fig. 9 is a block diagram of a PFC circuit control apparatus according to an embodiment of the present invention.
In some embodiments of the present invention, as shown in fig. 9, the PFC circuit control device 10 includes a dc bus voltage acquisition unit 1, an ac voltage acquisition unit 2, an ac current acquisition unit 3, and a control unit 4.
The direct current bus voltage acquisition unit 1 is used for acquiring direct current bus voltage of the PFC circuit. The alternating voltage acquisition unit 2 is used for acquiring alternating input voltage of the PFC circuit. The alternating current acquisition unit 3 is used for acquiring alternating input current of the PFC circuit. The control unit 4 is connected with the direct current bus voltage acquisition unit 1, the alternating current voltage acquisition unit 2 and the alternating current acquisition unit 3, and is used for executing the PFC control method of the variable frequency air conditioner in any one of the above embodiments.
In some embodiments of the present invention, the PFC circuit control device 10 may select a general PFC control topology structure, when the whole device works, the control unit 4 controls the PFC circuit to work according to the ac input voltage, the ac current collecting unit 3 collects the ac input current of the PFC circuit in real time, and the control unit 4 calculates the ac input current effective value according to the ac input current according to the root-mean-square definition of the current effective value. The direct current bus voltage acquisition unit 1 detects the bus voltage at the same time, when the direct current bus voltage is the same as the target voltage stored in the control unit 4, the PFC circuit is determined to be normal, and the whole machine is controlled to work according to the calculated effective value of the alternating current input current. When the direct current bus voltage is a voltage value obtained by directly rectifying the alternating current input voltage of the PFC circuit, determining that the PFC circuit has a fault, or when the direct current bus voltage is smaller than the direct current bus voltage value when the PFC circuit normally operates, or when the control unit 4 cannot acquire the direct current bus voltage and determines that the direct current bus voltage acquisition unit 1 has a fault, the control unit 4 controls the working state of the frequency conversion air conditioner based on the effective value of the alternating current input current and the instantaneous value of the alternating current input current, so that the whole machine is ensured to work without stopping, a current peak value can be effectively prevented from damaging devices, and the reliable operation and protection of the whole machine are realized.
According to the PFC circuit control device 10 of the embodiment of the present invention, the control unit 4 determines the open circuit condition of the PFC circuit according to the dc bus voltage collected by the dc bus voltage collection unit 1 and the ac bus voltage collected by the ac voltage collection unit 2, and controls the operating state of the inverter air conditioner based on the ac input current collected by the ac current collection unit 3 when the PFC circuit fails or the dc bus voltage collection unit 1 fails. The circuit hardware structure does not need to be changed, and through software control, when a PFC circuit fault or a signal detection is abnormal, the frequency conversion air conditioner is not directly controlled to stop, but the working state of the frequency conversion air conditioner is controlled by comprehensively considering a current effective value and a current peak value, so that the indoor environment is not uncomfortable due to direct stop, the current peak value protection cannot be triggered, the current peak value can be effectively prevented from damaging devices, the reliable operation and protection of the whole machine are realized, and the use feeling of a user is ensured.
In some embodiments of the present invention, as shown in fig. 10, a schematic diagram of a PFC circuit control apparatus according to an embodiment of the present invention is shown, where the PFC circuit control apparatus 10 according to the embodiment of the present invention may adopt a general PFC control topology structure, an ac voltage collecting unit 2 is connected to an ac power supply U, and is configured to collect an ac input voltage of the PFC circuit and send the ac input voltage to a control unit 4, and when the whole apparatus works, the control unit 4 generates a PWM signal according to the ac input voltage to a PFC driving circuit to control the PFC circuit to work. The alternating current collecting unit 3 is connected with the resistor R and the output end of the power device IGBT1, and sends the collected alternating input current of the PFC circuit to the control unit 4, where the alternating input current is an instantaneous value of the alternating input current, and the control unit 4 calculates an effective value of the alternating input current according to the instantaneous value of the alternating input current and the root mean square definition of the current effective value. The direct current bus voltage acquisition unit 1 is connected with a direct current bus and a capacitor C1, and transmits the acquired direct current bus voltage of the PFC circuit to the control unit 4, and the control unit 4 compares the acquired direct current bus voltage of the PFC circuit with a target value set by the main control MCU to detect the working state of the PFC circuit.
In the embodiment, when the collected direct current bus voltage is different from the target voltage stored in the control unit 4, it is determined that the direct current bus voltage meets the open circuit condition control condition of the PFC circuit, and the control unit 4 controls the working state of the inverter air conditioner based on the effective value of the alternating current input current and the instantaneous value of the alternating current input current, so as to ensure that the whole machine does not stop working, effectively prevent the power device IGBT1, the diode D1, the capacitor L1, the capacitor C and the like from being broken down, and realize reliable operation and protection of the whole machine.
In some embodiments of the present invention, as shown in fig. 11, there is a block diagram of an inverter air conditioner according to some embodiments of the present invention, wherein the inverter air conditioner 100 includes an air conditioner body 20 and a PFC circuit 30, and the PFC circuit control device 10 of the above second aspect embodiment, wherein the PFC circuit control device 10 is connected with the PFC circuit 30, and both the PFC circuit control device 10 and the PFC circuit 30 are disposed on the air conditioner body 20.
According to the inverter air conditioner 100 of the embodiment of the invention, by adopting the PFC circuit control device 10 of the above embodiment and executing the PFC control method of the inverter air conditioner of the above embodiment, when the PFC circuit 30 fails, the control unit 4 in the PFC circuit control device 10 controls the working state of the inverter air conditioner 100 based on the alternating input current. The hardware structure of the circuit does not need to be changed, and the whole machine is controlled not to stop working through software control when the PFC circuit 30 fails or the direct current bus voltage acquisition unit 1 fails, so that the device can be effectively prevented from being damaged by the current peak value, the reliable operation and protection of the whole machine are realized, and the use feeling of a user is guaranteed.
Other configurations and operations of the PFC circuit 30 and the inverter air conditioner 100 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 PFC control method of a variable frequency air conditioner is characterized by comprising the following steps:
acquiring the voltage of a direct current bus of a PFC circuit;
determining that the direct current bus voltage meets the open circuit condition control condition of the PFC circuit;
acquiring alternating current input current of the PFC circuit;
calculating the current effective value of the alternating current input current, and acquiring the current peak value of the alternating current input current;
and controlling the working state of the variable frequency air conditioner according to the current effective value and the current peak value.
2. The PFC control method of claim 1, wherein determining that the DC bus voltage meets an open circuit condition control condition of the PFC circuit comprises:
the direct current bus voltage meets at least one of the following conditions, and the direct current bus voltage is determined to meet the open circuit condition control condition of the PFC circuit:
the direct current bus voltage is a voltage value obtained by directly rectifying the alternating current input voltage of the PFC circuit;
the direct current bus voltage is smaller than the direct current bus voltage value when the PFC circuit operates normally;
and obtaining the direct current bus voltage.
3. The PFC control method of the inverter air conditioner according to claim 1, wherein controlling the working state of the inverter air conditioner according to the current effective value and the current peak value comprises:
acquiring a current effective value limit value and a current peak value limit value;
and controlling the working state of the variable-frequency air conditioner according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value.
4. The PFC control method of an inverter air conditioner according to claim 3,
the current effective value limit values comprise a current effective value forbidden rising frequency limit value, a current effective value lower frequency limit value and a current effective value stopping limit value, and the current peak value limit values comprise a current peak value forbidden rising frequency limit value, a current peak value lower frequency limit value and a current peak value stopping limit value, wherein the current effective value stopping limit value is larger than the current effective value lower frequency limit value and larger than the current effective value forbidden rising frequency limit value, and the current peak value stopping limit value is larger than the current peak value lower frequency limit value and larger than the current peak value forbidden rising frequency limit value;
controlling the working state of the inverter air conditioner according to the comparison result of the current effective value and the current effective value limit value and the comparison result of the current peak value and the current peak value limit value, and the method comprises the following steps:
and determining that the current effective value is smaller than the current effective value forbidden frequency rising limit value and the current peak value is smaller than the current peak forbidden frequency rising limit value, and controlling the frequency conversion air conditioner to normally work.
5. The PFC control method of claim 4, wherein the working state of the inverter air conditioner is controlled according to the comparison result of the effective current value and the limit current value and the comparison result of the peak current value and the limit current value, and further comprising:
determining that the current effective value is smaller than the current effective value forbidden frequency rising limit value, and the current peak value is larger than or equal to the current peak value forbidden frequency rising limit value and smaller than the current peak value lower frequency falling limit value, and controlling the load of the variable frequency air conditioner to forbid frequency rising work;
or determining that the current effective value is greater than or equal to the current effective value forbidden frequency rising limit value and smaller than the current effective value lower frequency rising limit value, and the current peak value is smaller than the current peak value forbidden frequency rising limit value, and controlling the load of the variable frequency air conditioner to forbid frequency rising work.
6. The PFC control method of claim 5, wherein the working state of the inverter air conditioner is controlled according to the comparison result of the effective current value and the limit current value and the comparison result of the peak current value and the limit current value, and further comprising:
determining that the current effective value is smaller than the current effective value and the frequency-rise prohibiting limit value, and the current peak value is greater than or equal to the current peak value frequency-fall limit value and smaller than the current peak value shutdown limit value, and controlling the load frequency-reduction work of the frequency conversion air conditioner;
or determining that the current effective value is greater than or equal to the current effective value lower frequency limit and less than the current effective value shutdown limit, and the current peak value is less than the current peak value forbidden frequency increase limit, and controlling the load of the variable frequency air conditioner to work in a frequency reduction mode.
7. The PFC control method of any one of claims 4-6, wherein the working state of the inverter air conditioner is controlled according to the comparison result of the effective current value and the effective current value limit value and the comparison result of the peak current value and the peak current value limit value, and further comprising:
determining that the current effective value is smaller than the current effective value and the frequency-rise-forbidden limit value, and the current peak value is larger than or equal to the current peak value stop limit value, and controlling the frequency-variable air conditioner to stop;
or determining that the current effective value is greater than or equal to the current effective value shutdown limit value, and the current peak value is smaller than the current peak value forbidden ascending frequency limit value, and controlling the variable frequency air conditioner to be shut down.
8. The PFC control method of claim 2, wherein after determining that the DC bus voltage satisfies an open circuit condition control condition of the PFC circuit, the method further comprises: and prompting the fault of the PFC circuit.
9. A PFC circuit control apparatus comprising:
the direct current bus voltage acquisition unit is used for acquiring the direct current bus voltage of the PFC circuit;
the alternating voltage acquisition unit is used for acquiring alternating input voltage of the PFC circuit;
the alternating current acquisition unit is used for acquiring alternating input current of the PFC circuit;
and the control unit is connected with the direct current bus voltage acquisition unit, the alternating current voltage acquisition unit and the alternating current acquisition unit and is used for executing the PFC control method of the variable frequency air conditioner as claimed in any one of claims 1-8.
10. An inverter air conditioner, comprising:
the air conditioner comprises an air conditioner body and a PFC circuit;
the PFC circuit control device of claim 9, coupled to the PFC circuit.
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CN105932871A (en) * 2016-05-27 2016-09-07 广东美的制冷设备有限公司 Control method of compressor in air conditioner, control device of compressor in air conditioner, and air conditioner
CN106918121A (en) * 2017-03-31 2017-07-04 广东美的制冷设备有限公司 Air-conditioner and its control method and device
CN107270500A (en) * 2017-06-07 2017-10-20 广东美的制冷设备有限公司 Air conditioner and its compressor control method and computer-readable recording medium

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CN113612378A (en) * 2021-07-26 2021-11-05 海信（山东）空调有限公司 Method and device for controlling PFC circuit of variable frequency air conditioner, air conditioner and storage medium
WO2023005594A1 (en) * 2021-07-26 2023-02-02 海信空调有限公司 Air conditioner, and method for controlling pfc circuit of air conditioner
WO2023030179A1 (en) * 2021-08-30 2023-03-09 青岛海尔空调器有限总公司 Phase measurement method and system for bus voltage ripple of air conditioner compressor
CN114322227A (en) * 2021-12-30 2022-04-12 海信（山东）空调有限公司 Compressor control method and device, household appliance and storage medium
CN114322227B (en) * 2021-12-30 2023-09-15 海信空调有限公司 Control method and device of compressor, household appliance and storage medium
CN114427738A (en) * 2022-01-18 2022-05-03 海信（山东）空调有限公司 Motor control method, air conditioner and computer storage medium

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