WO2023005594A1 - 空调器和用于空调器的pfc电路的控制方法 - Google Patents

空调器和用于空调器的pfc电路的控制方法 Download PDF

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Publication number
WO2023005594A1
WO2023005594A1 PCT/CN2022/103191 CN2022103191W WO2023005594A1 WO 2023005594 A1 WO2023005594 A1 WO 2023005594A1 CN 2022103191 W CN2022103191 W CN 2022103191W WO 2023005594 A1 WO2023005594 A1 WO 2023005594A1
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Prior art keywords
voltage
circuit
sampling
pfc circuit
bus
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PCT/CN2022/103191
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English (en)
French (fr)
Inventor
高思云
牟宗娥
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海信空调有限公司
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Publication of WO2023005594A1 publication Critical patent/WO2023005594A1/zh

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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

Definitions

  • the present disclosure relates to the technical field of air conditioners, and more specifically, to an air conditioner.
  • frequency conversion air conditioners In order to improve the utilization rate of power supply energy and reduce the harmonic pollution to the power grid, frequency conversion air conditioners generally have the function of PFC (Power Factor Correction, power factor correction). Inverter air conditioners generally use PFC circuits, which can greatly improve the power factor of the whole machine , to provide reliable DC voltage for variable frequency load compressors.
  • PFC Power Factor Correction, power factor correction
  • the air conditioner includes: a rectification circuit, the input end of the rectification circuit is connected to an AC power supply; a PFC circuit, the input end of the PFC circuit is connected to the output end of the rectification circuit; an AC voltage sampling circuit, The AC voltage sampling circuit is connected to the input terminal of the rectifier circuit and is configured to detect the sampling voltage of the AC power supply; the AC current sampling circuit is connected to the output terminal of the PFC circuit and is configured to detect the sampling current of the AC power supply; the DC bus voltage sampling circuit circuit, the DC bus voltage sampling circuit is connected to the output end of the PFC circuit, and is configured to collect the DC bus sampling voltage; the controller is connected to the AC voltage sampling circuit, the AC sampling circuit and the DC bus voltage sampling circuit respectively; the controller is It is configured to determine the command current value based on the sampling voltage of the AC power supply, the sampling current of the AC power supply and the sampling voltage of the DC bus.
  • the PFC circuit is controlled to run at the preset initial duty cycle, and for a preset duration
  • the duty cycle of the driving signal for internally controlling the PFC circuit is increased from a preset initial duty cycle to a target duty cycle.
  • 1 is a waveform diagram of the relationship between AC input voltage and AC input current and time when the PFC circuit in the related art works normally;
  • FIG. 2 is a flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to some embodiments
  • FIG. 3 is another flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to some embodiments
  • FIG. 4 is another flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to some embodiments
  • FIG. 5 is another flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to some embodiments
  • FIG. 6 is another flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to some embodiments
  • FIG. 7 is another flowchart of a method for controlling a PFC circuit of an inverter air conditioner according to some embodiments.
  • FIG. 8 is a block diagram of an apparatus for controlling a PFC circuit of an inverter air conditioner according to some embodiments
  • FIG. 9 is a block diagram of an inverter air conditioner according to some embodiments.
  • Figure 10 is a schematic diagram of a PFC circuit according to some embodiments.
  • FIG. 11 is a schematic diagram of an inverter air conditioner according to some embodiments.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure in specific situations.
  • FIG. 1 is a waveform diagram of the relationship between AC input voltage and AC input current and time when the PFC circuit in the related art works normally.
  • curve A represents the AC input voltage waveform when the PFC circuit works normally
  • curve B represents the AC input current waveform when the PFC circuit works normally.
  • Vpeak represents the peak value of the AC input voltage
  • Ipeak represents 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 sine waves
  • the phase of the waveform of the AC input current is consistent with the phase of the waveform of the input AC voltage.
  • the PFC circuit Since the PFC circuit is working, while performing power factor correction, it also performs boost control of the DC voltage.
  • the bus voltage will rise due to the boost function of the PFC circuit. small, the output value of the voltage loop control of the PFC circuit will decrease rapidly, and the output value of the current loop control will also decrease, and the minimum can be reduced to zero.
  • the bus voltage With the function of feedforward control, the bus voltage will still rise until the PFC circuit turns off the bus voltage to decrease. During this process, there may be a situation that the bus voltage is too high to cause a fault and affect the user's use, and it is not conducive to the safety control of the electrolytic capacitor.
  • the air conditioner in the present disclosure performs a cooling/heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator.
  • the refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to air that has been conditioned and heat-exchanged.
  • the compressor compresses refrigerant gas in a state of high temperature and high pressure 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 the 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 realize the refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.
  • the air conditioner regulates the temperature of the interior space.
  • the outdoor unit of the air conditioner refers to a part of the refrigeration cycle including a compressor and an outdoor heat exchanger
  • the indoor unit of the air conditioner includes an indoor heat exchanger
  • an expansion valve may be provided in the indoor unit or the outdoor unit.
  • the indoor heat exchanger and the outdoor heat exchanger are used as condensers or evaporators.
  • the air conditioner is used as a heater in heating mode
  • the indoor heat exchanger is used as an evaporator
  • the air conditioner is used as a cooler in cooling mode.
  • the air conditioner includes an air conditioner indoor unit installed in an indoor space.
  • the indoor unit of the air conditioner that is, the above-mentioned indoor unit
  • is connected to the outdoor unit of the air conditioner that is, the above-mentioned 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 similar components of a refrigeration cycle, and the indoor unit of the air conditioner may also be provided with an indoor heat exchanger and an indoor fan.
  • FIG. 2 is a flowchart of a method for controlling the PFC circuit of an inverter air conditioner according to an embodiment of the present invention, wherein the method for controlling the PFC circuit of an inverter air conditioner includes at least steps S1- S4, specifically as follows.
  • setting the PFC circuit before the inverter air conditioner can realize the power factor correction of the AC input current flowing into the load and the power correction of the DC bus sampling voltage, To provide reliable DC bus sampling voltage for the load.
  • the AC voltage sampling circuit can be set to be connected to the AC power supply for detecting the sampling voltage of the AC power supply.
  • the AC current sampling circuit is connected to the PFC circuit to detect the AC power supply sampling current, and the DC bus voltage sampling circuit is connected to the PFC circuit to collect the DC bus sampling voltage.
  • the collected AC power sampling voltage, AC power sampling current, and DC bus sampling voltage can be obtained by the controller.
  • a double-loop control method of voltage loop and current loop with feedforward control is generally adopted, that is, a dual-loop control is performed on the PFC circuit, wherein the input of the current loop is the output of the voltage loop,
  • the minimum output value of the current loop control can be zero.
  • the controller calculates and processes the collected AC power sampling voltage, AC power sampling current, and DC bus sampling voltage to obtain the command current value of the PFC circuit, that is, the current loop control output value. By detecting the command current value of the PFC circuit, the Realize the protection control of PFC circuit.
  • the load connected to the PFC circuit decreases sharply, the load consumes less electrolytic capacitor power. Since the PFC circuit has a boost function, the DC bus voltage will rise. At this time, the control output of the PFC voltage loop The value will decrease rapidly, and the output value of the current loop control will also decrease, and the minimum value can be reduced to zero. Among them, the output value of the current loop control is the command current value.
  • the preset current value is set to zero.
  • the command current value of the PFC circuit is detected in real time.
  • the command current value is less than or equal to the preset current value, that is, when the command current value is determined to be less than or equal to zero, the load is considered to be reduced.
  • the sampling voltage of the DC bus will rise, and the PFC circuit needs to be protected.
  • the control voltage value is slowly increased from zero to the rated voltage, so that the starting current of the load during the starting process is changed from uncontrollable overload current to controllable, and the starting current can be adjusted according to needs. There is no impact torque in the whole process of the soft start of the PFC circuit, so as to ensure the smooth start of the connected load.
  • the PFC circuit When controlling the PFC circuit to perform soft start, restart the soft start reset of the PFC circuit, that is, restore to the initial start parameters of the soft start, and perform soft start again.
  • the duty cycle of the PFC circuit can be controlled to complete the soft start of the PFC circuit, and after the PFC circuit is soft started, the PFC circuit can be controlled according to the DC bus sampling voltage. Protect.
  • the duty ratio of the PFC circuit can be controlled, the calculation method for controlling the duty ratio of the PFC circuit can be adjusted, and the PFC circuit can be controlled to work according to the adjusted calculation and control method, thereby completing the PFC circuit soft start.
  • the sampling voltage of the DC bus is detected in real time.
  • the back-end load decreases sharply, the sampling voltage of the DC bus will rise.
  • control The controller should control the PFC circuit to close, so that the bus voltage will drop rapidly, so as to protect the PFC circuit.
  • the command current value of the PFC circuit is obtained based on the sampling voltage of the AC power supply, the sampling current of the AC power supply and the sampling voltage of the DC bus.
  • the load connected to the PFC circuit decreases sharply, the bus voltage continues to rise, and the command current value decreases sharply.
  • the preset current value when the command current value is determined to be less than or equal to the preset current value, the PFC circuit is directly controlled. Soft start can reduce the bus voltage rapidly, avoid failures caused by high bus voltage and affect user use, and also reduce the risk of back-end electrolytic capacitor breakdown due to high bus voltage, so as to realize the protection of PFC circuit and Safe control of electrolytic capacitors.
  • the PFC circuit when the back-end load drops sharply, if the PFC circuit will quickly reduce the PWM (Pulse Width Modulation, pulse width modulation) duty cycle according to the usual control strategy, but because the back-end load suddenly drops to a very low level, There is almost no consumption of energy storage in the electrolytic capacitor. In this case, even if the duty cycle is reduced according to the usual logic, the bus voltage will continue to rise until the PFC circuit is turned off. reduce the bus voltage. In the whole process, the PFC circuit acts as a Boost (boost circuit), which cannot realize step-down control. If the bus voltage is too high, it may cause the PFC circuit to malfunction, affect the user's use, and also affect the life of the back-end electrolytic capacitor.
  • Boost boost
  • FIG. 3 is a flow chart of a method for controlling the PFC circuit of an inverter air conditioner according to another embodiment of the present invention, wherein, controlling the PFC circuit to perform a soft start, that is, the above step S4 Step S41 is included, specifically as follows.
  • the initial duty ratio is preset first, and after the PFC circuit satisfies the start-up condition for soft start, the PFC circuit is controlled to operate at the preset initial duty ratio, and the PFC circuit is controlled within a preset time period.
  • the duty cycle of the driving signal is increased from a preset initial duty cycle to a target duty cycle.
  • both the initial duty cycle and the target duty cycle can be obtained from the operation big data or set under laboratory conditions.
  • the duty cycle of the driving signal controlling the PFC circuit increases linearly from the preset initial duty cycle until reaching the target duty cycle, wherein the preset time length can be determined according to needs or under laboratory conditions. It is set to ensure that the duty cycle of the driving signal of the PFC circuit can increase stably from the initial duty cycle to the target duty cycle.
  • the duty ratio control of the PFC circuit is performed according to the normal voltage feedforward control of the control output value of the voltage loop and the control output value of the current loop.
  • FIG. 4 is a flowchart of a method for controlling the PFC circuit of an inverter air conditioner according to another embodiment of the present invention, wherein the method for controlling the PFC circuit of an inverter air conditioner includes steps S101- S110, specifically as follows.
  • step S102 judging whether the PFC circuit is soft-started, if the judging result is "yes”, then execute step S103, if the judging result is "no", then go to step S107.
  • the duty ratio control of the PFC circuit is performed by the voltage loop, the current loop and the voltage feedforward.
  • step S105 judging whether the duty ratio of the PFC circuit reaches the target duty ratio, if the judging result is "yes”, execute step S106, if the judging result is "no", then end the process.
  • the duty ratio control of the PFC circuit is performed by the voltage loop, the current loop and the voltage feedforward.
  • the PFC circuit is controlled according to the adjusted calculation control method It does not need to meet the conditions for the PFC circuit to be closed, and can also quickly reduce the bus voltage to prevent the occurrence of overvoltage protection without affecting the life of the electrolytic capacitor.
  • FIG. 5 is a flowchart of a method for controlling the PFC circuit of an inverter air conditioner according to another embodiment of the present invention, wherein, controlling the PFC circuit to perform a soft start, that is, the above step S4 Step S42 is also included, specifically as follows.
  • the PFC circuit is a circuit with a boost function.
  • the DC bus voltage is boosted to the target voltage value, so as to ensure the safe and reliable operation of the controller.
  • the DC bus voltage should be set to work below the limit value.
  • the DC bus voltage exceeds the limit value, it is necessary to close the PFC circuit or control the inverter air conditioner to stop.
  • the sampling voltage of the DC bus is obtained in real time.
  • the back-end load decreases sharply, the sampling voltage of the DC bus will rise.
  • the controller should control the PFC circuit to close, so that the bus voltage drops rapidly, so as to protect the PFC circuit.
  • FIG. 6 is a flow chart 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 the sampling voltage of the DC bus, That is, the above step S42 may include step S421 and step S422, specifically as follows.
  • the first voltage threshold may be set to be 400V.
  • the DC bus voltage sampling circuit can be set to be connected to the PFC circuit to collect the data of the filtered DC bus sampling voltage.
  • the sampling voltage of the DC bus is greater than the first voltage threshold, it is determined that there is a fault, and the PFC circuit is immediately controlled to shut down, the inverter air conditioner is controlled to stop and an alarm is issued.
  • S422. Determine that the sampling voltage of the DC bus is greater than a second voltage threshold, and control the PFC circuit to shut down, wherein the second voltage threshold is less than the first voltage threshold.
  • the second voltage threshold can be set to 390V.
  • FIG. 7 is a flowchart of a method for controlling the PFC circuit of an inverter air conditioner according to another embodiment of the present invention, wherein the method for controlling the PFC circuit of an inverter air conditioner includes steps S201- S207, specifically as follows.
  • step S202 judging whether the command current value is equal to zero, if the judging result is "yes”, go to step S203, if the judging result is "no", go to step S204.
  • step S204 judging whether the sampling voltage of the DC bus is greater than the first voltage threshold, if the judging result is "yes”, go to step S205, if the judging result is "no", go to step S206.
  • step S206 judging whether the sampling voltage of the DC bus is greater than the second voltage threshold, if the judging result is "yes”, execute step S207, if the judging result is "no", then end the operation.
  • the PFC circuit when it is determined according to the collected sampling voltage of the DC bus that the condition for shutting down the PFC circuit is met, the PFC circuit is controlled to shut down or the inverter air conditioner is shut down to give a fault alarm, so as to quickly reduce the bus voltage. , so as to achieve overvoltage protection.
  • FIG. 8 is a block diagram of a device for controlling the PFC circuit of an inverter air conditioner according to an embodiment of the present invention, wherein the device 100 for controlling the PFC circuit of an inverter air conditioner includes a parameter acquisition module 101 , a command current acquisition module 102 , a determination module 104 and a control module 103 .
  • the parameter acquiring module 101 is used to acquire the input voltage of the AC power supply, the input current of the AC power supply and the sampling voltage of the DC bus.
  • the instruction current obtaining module 102 is used to obtain the instruction current value of the PFC circuit according to the input voltage of the AC power supply, the input current of the AC power supply and the sampling voltage of the DC bus.
  • the determination module 104 is used to determine that the command current value is less than or equal to the preset current value.
  • the control module 103 is used to control the PFC circuit to perform soft start.
  • the command current obtaining module 102 performs The command current value of the PFC circuit is obtained through calculation, and the command current value is sent to the determination module 104 .
  • the preset current value is stored in the determination module 104, and the determination module 104 compares the command current value with the preset current value, and when it is determined that the command current value is less than or equal to the preset current value, it can send a signal to the control module 103, and the control module 103 Used to control the PFC circuit for soft start.
  • the device 100 for controlling the PFC circuit of an inverter air conditioner is based on the architecture of the parameter acquisition module 101, the command current acquisition module 102 and the determination module 104, according to the collected AC power sampling voltage, AC power sampling current and DC bus sampling
  • the voltage obtains the command current value of the PFC circuit.
  • the control module 103 directly controls the PFC circuit to perform soft start, so that the bus voltage drops rapidly, avoiding the failure of the user due to the high bus voltage, and reducing the risk of failure caused by the bus voltage. High risk of breakdown of the back-end electrolytic capacitor, so as to realize the protection of the PFC circuit and the safety control of the electrolytic capacitor.
  • Fig. 9 is a block diagram of an inverter air conditioner according to an embodiment of the present invention.
  • the inverter air conditioner 10 includes a rectifier circuit 1 , a PFC circuit 2 , an AC voltage sampling circuit 3 , an AC current sampling circuit 4 , a DC bus voltage sampling circuit 5 and a controller 6 .
  • the input terminal of the rectification circuit 1 is connected to the AC power supply U, and the rectification circuit 1 is used for rectifying the AC power input by the AC power supply U.
  • the input end of the PFC circuit 2 is connected to the output end of the rectification circuit 1 .
  • the PFC circuit 2 has the function of power factor correction. By setting the PFC circuit, the power correction of the AC input current flowing into the load and the DC bus voltage can be realized, so as to provide the load with reliable AC input current and DC bus sampling voltage.
  • the AC voltage sampling circuit 3 is connected to the input terminal of the rectification circuit 1 for detecting the sampling voltage of the AC power supply.
  • the AC current sampling circuit 4 is connected to the output end of the PFC circuit 2 for detecting the sampling current of the AC power supply.
  • the DC bus voltage sampling circuit 5 is connected to the output terminal of the PFC circuit 2 for collecting the DC bus sampling voltage.
  • the controller 6 is connected to the AC voltage sampling circuit 3, the AC current sampling circuit 4 and the DC bus voltage sampling circuit 5 respectively, and is used to control the PFC circuit 2 according to the method for controlling the PFC circuit of an inverter air conditioner in any of the above embodiments.
  • the controller 6 controls the PFC circuit 2 to work according to the operating conditions of the controlled load, and the AC voltage sampling circuit 3, the AC current sampling circuit 4 and the DC bus voltage sampling circuit 5 collect the collected AC power sampling voltage and AC power sampling current 1.
  • the DC bus sampling voltage is input to the controller 6, and the controller 6 obtains the command current value of the PFC circuit 2 according to the obtained AC power sampling voltage, AC power sampling current and DC bus sampling voltage, and compares the command current value with the preset The current values are compared, and when it is determined that the command current value is less than or equal to the preset current value, the PFC circuit 2 is controlled to perform soft start.
  • the AC voltage sampling circuit 3 , the AC current sampling circuit 4 and the DC bus voltage sampling circuit 5 respectively send the collected AC power sampling voltage, AC power sampling current and DC bus sampling voltage to Controller 6, the controller 6 controls the operating state of the PFC circuit 2 based on the acquired AC power sampling voltage, AC power sampling current and DC bus sampling voltage.
  • the inverter air conditioner 10 of the present invention is based on the rectifier circuit 1, the PFC circuit 2, the AC voltage
  • the structure of the sampling circuit 3, the AC current sampling circuit 4, the DC bus voltage sampling circuit 5 and the controller 6 does not change the cost, and the control method of the PFC circuit 2 is carried out by implementing the method for controlling the PFC circuit of the inverter air conditioner in some embodiments above.
  • control PFC circuit 2 can work according to the adjusted calculation control method, so that the bus voltage can be reduced rapidly, preventing the occurrence of overvoltage protection, and at the same time, the life of the electrolytic capacitor is not affected.
  • FIG. 10 is a schematic diagram of a PFC circuit according to an embodiment of the present invention, wherein the PFC circuit 2 includes an inductor L1, a PFC drive circuit 21, a power module 22, and a diode D1. and electrolytic capacitor C1.
  • the PFC circuit 2 includes an inductor L1, a PFC drive circuit 21, a power module 22, and a diode D1. and electrolytic capacitor C1.
  • the first end of the inductor L1 is connected to the first output end of the rectifier circuit 1
  • the input end of the PFC driving circuit 21 is connected to the controller 6 .
  • the controller 6 can control the operation state of the PFC circuit 2 based on the acquired AC power sampling voltage, AC power sampling current and DC bus sampling voltage.
  • the controller 6 can send a PWM signal to the PFC driving circuit 21 to control the PFC circuit 2 to work.
  • the power module 22 can be set as a power device power, the first end of the power module 22, that is, the g end is connected to the output end of the PFC drive circuit 21, and the second end of the power module 22, that is, the C end is connected to the second end of the inductor L1,
  • the third end of the power module 22 that is, the E end, is respectively connected to the AC current sampling circuit 4 and the DC bus voltage sampling circuit 5 .
  • the anode of the diode D1 is connected to the second end of the power module 22 , and the cathode of the diode D1 is connected to the DC bus voltage sampling circuit.
  • a first end of the electrolytic capacitor C1 is connected to the cathode of the diode, and a second end of the electrolytic capacitor C1 is connected to the third end of the power module 22 .
  • FIG. 11 is a schematic diagram of an inverter air conditioner according to an embodiment of the present invention, wherein the inverter air conditioner 10 in some embodiments of the present disclosure can adopt a general PFC control topology
  • the AC voltage sampling circuit 3 is connected to the output terminal of the rectification circuit 1, and is used to collect the AC power sampling voltage input to the PFC circuit 2 and send it to the controller 6.
  • the controller 6 When the whole machine is working, the controller 6 generates a PWM signal according to the AC input voltage To the PFC drive circuit 21 to control the PFC circuit 2 to work.
  • the AC current sampling circuit 4 is connected to the resistor R and the output terminal of the power module 22 , and sends the collected AC power sampling current to the controller 6 .
  • the DC bus voltage sampling circuit 5 is connected to the DC bus and the electrolytic capacitor C1, and sends the collected DC bus sampling voltage to the controller 6, and the controller 6 obtains the AC power sampling voltage, the AC power sampling current and the DC bus
  • the command current value of the PFC circuit 2 is obtained by sampling the voltage, and the command current value is compared with the preset current value. When it is determined that the command current value is less than or equal to the preset current value, the PFC circuit 2 is controlled to perform soft start.
  • a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the control of the PFC circuit of an inverter air conditioner in any of the above embodiments is implemented. method.
  • a computer-readable storage medium stores a computer program on it, and when the computer program is executed, it can read instructions and obtain operating parameters of various components in the inverter air conditioner, and calculate and process the operating parameters, etc. And it has memory for the running state of each component in the inverter air conditioner, so as to realize any of the above methods of controlling the PFC circuit of the inverter air conditioner, and when the back-end load decreases sharply, the bus voltage can be reduced rapidly, thereby realizing the control of the inverter air conditioner.
  • the protection of the PFC circuit does not affect the life of the electrolytic capacitor.
  • each functional unit in each embodiment of the present disclosure may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.
  • the storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.
  • references to the terms “one embodiment,” “some embodiments,” “exemplary embodiments,” “example,” “specific examples,” or “some examples” are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present disclosure.
  • schematic representations of the above terms do not necessarily refer to the same embodiment or example.

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Abstract

公开一种空调器，包括：整流电路，整流电路的输入端与交流电源连接；PFC电路，PFC电路的输入端与整流电路的输出端连接；交流电压采样电路，交流电压采样电路与整流电路的输入端连接，被配置为检测交流电源采样电压；交流电流采样电路，交流电流采样电路与PFC电路输出端连接，被配置为检测交流电源采样电流；直流母线电压采样电路，直流母线电压采样电路与PFC电路的输出端连接，被配置为采集直流母线采样电压；控制器被配置为基于交流电源采样电压、交流电源采样电流和直流母线采样电压确定指令电流值，若指令电流值小于等于预设电流值，控制PFC电路以预设初始占空比运行，并在预设时长内控制PFC电路的驱动信号占空比从预设初始占空比增加至目标占空比。

Description

空调器和用于空调器的PFC电路的控制方法
相关申请的交叉引用
本公开要求在2021年7月26日提交中国专利局、申请号为202110841841.5的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及空调技术领域，更具体地，涉及一种空调器。
背景技术
变频空调为了提高电源能量的利用率，降低对电网的谐波污染，一般都会具有PFC(Power Factor Correction，功率因数校正)功能，变频空调器一般采用PFC电路，能极大提高整机的功率因数，为变频负载压缩机提供可靠的直流电压。
发明内容
本公开的一些实施例提供一种空调器，空调器包括：整流电路，整流电路的输入端与交流电源连接；PFC电路，PFC电路的输入端与整流电路的输出端连接；交流电压采样电路，交流电压采样电路与整流电路的输入端连接，被配置为检测交流电源采样电压；交流电流采样电路，交流电流采样电路与PFC电路输出端连接，被配置为检测交流电源采样电流；直流母线电压采样电路，直流母线电压采样电路与PFC电路的输出端连接，被配置为采集直流母线采样电压；控制器，控制器与交流电压采样电路、交流采样电路和直流母线电压采样电路分别连接；控制器被配置为基于交流电源采样电压、交流电源采样电流和直流母线采样电压确定指令电流值，若指令电流值小于等于预设电流值，控制PFC电路以预设初始占空比运行，并在预设时长内控制PFC电路的驱动信号占空比从预设初始占空比增加至目标占空比。
附图说明
图1是相关技术中PFC电路正常工作时交流输入电压和交流输入电流与时间关系的波形图；
图2为根据一些实施例的控制变频空调PFC电路的方法的一种流程图；
图3为根据一些实施例的控制变频空调PFC电路的方法的另一种流程图；
图4为根据一些实施例的控制变频空调PFC电路的方法的另一种流程图；
图5为根据一些实施例的控制变频空调PFC电路的方法的另一种流程图；
图6为根据一些实施例的控制变频空调PFC电路的方法的另一种流程图；
图7为根据一些实施例的控制变频空调PFC电路的方法的另一种流程图；
图8为根据一些实施例的控制变频空调PFC电路的装置的框图；
图9为根据一些实施例变频空调的框图；
图10为根据一些实施例的PFC电路的示意图；
图11为根据一些实施例的变频空调的示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
在本公开的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。
术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
图1是相关技术中PFC电路正常工作时交流输入电压和交流输入电流与时间关系的波形图。
在相关技术中，在PFC电路正常工作的情况下，如图1所示，其中，曲线A表示PFC电路正常工作时的交流输入电压波形，曲线B表示PFC电路正常工作时的交流输入电流波形，Vpeak表示交流输入电压峰值，Ipeak表示交流输入电流峰值，交流输入电流波形与交流输入电压波形均为正弦波，且交流输入电流波形的相位与输入交流电压波形的相位一致。
由于PFC电路工作后在进行功率因数校正的同时，也进行了直流电压的升压控制。PFC电路在工作过程中，若压缩机的负载突然急剧降低，如：四通阀换向时，由于PFC电路的升压功能，导致母线电压将有所上升，此时由于负载消耗电解电容电量变小，PFC电 路的电压环控制输出值将迅速减小，电流环控制输出值也将减小，最小可减为零，但在负载很小的情况下，双环控制的输出即便为零，由于电压前馈控制的作用，母线电压仍会上升，直至PFC电路关闭母线电压才能降低。在此过程中，可能会出现因母线电压过高导致故障而影响用户使用的情况，并且不利于电解电容的安全控制。
本公开中空调器通过使用压缩机、冷凝器、膨胀阀和蒸发器来执行空调器的制冷/制热循环。其中，制冷循环包括一系列过程，涉及压缩、冷凝、膨胀和蒸发，并向已被调节和热交换的空气供应冷媒。
压缩机压缩处于高温高压状态的冷媒气体并排出压缩后的冷媒气体。所排出的冷媒气体流入冷凝器。冷凝器将压缩后的冷媒冷凝成液相，并且热量通过冷凝过程释放到周围环境。
膨胀阀使在冷凝器中冷凝的高温高压状态的液相冷媒膨胀为低压的液相冷媒。蒸发器蒸发在膨胀阀中膨胀的冷媒，并使处于低温低压状态的冷媒气体返回到压缩机。蒸发器可以通过利用冷媒的蒸发的潜热与待冷却的材料进行热交换来实现制冷效果。在整个循环中，空调器可以调节室内空间的温度。
空调器的室外单元是指制冷循环的包括压缩机和室外热交换器的部分，空调器的室内单元包括室内热交换器，并且膨胀阀可以提供在室内单元或室外单元中。
室内热交换器和室外热交换器用作冷凝器或蒸发器。当室内热交换器用作冷凝器时，空调器用作制热模式的加热器，当室内热交换器用作蒸发器时，空调器用作制冷模式的冷却器。
根据本公开一些实施例的空调器，所述空调器包括安装在室内空间中的空调器室内机。空调器室内机即上述室内单元，通过管连接到安装在室外空间中的空调器室外机即上述室外单元。空调器室外机中可设有压缩机、室外热交换器、室外风扇、膨胀器和制冷循环的类似部件，空调器室内机中也可设有室内热交换器和室内风扇。
下面参考图2-图7描述根据本公开一些实施例的控制变频空调PFC电路的方法。需要说明的是，本公开中的步骤序号例如S1、S2、S3和S4等仅为了便于描述本方案，不能理解为对步骤的顺序限定。也就是说，例如步骤S1、S2、S3和S4等的执行顺序可以根据实际需求具体确定，不仅限于按照下面实施例中步骤的顺序进行控制。
在本公开的一些实施例中，如图2所示，图2为根据本发明一个实施例的控制变频空调PFC电路的方法的流程图，其中，控制变频空调PFC电路的方法至少包括步骤S1-S4，具体如下。
S1，获取交流电源采样电压、交流电源采样电流和直流母线采样电压。
在一些实施例中，其中，由于PFC电路具有功率因数校正的功能，在变频空调前设置 PFC电路，可实现对流入负载的交流输入电流进行功率因数校正，以及对直流母线采样电压进行功率校正，以为负载提供可靠的直流母线采样电压。
可设置交流电压采样电路与交流电源连接，用于检测交流电源采样电压。设置交流电流采样电路与PFC电路连接用于检测交流电源采样电流，以及设置直流母线电压采样电路与PFC电路连接用于采集直流母线采样电压。采集到的交流电源采样电压、交流电源采样电流、直流母线采样电压可被控制器获取。
S2，根据交流电源采样电压、交流电源采样电流和直流母线采样电压获得PFC电路的指令电流值。
在一些实施例中，对PFC电路进行控制时，一般采取带前馈控制的电压环、电流环的双环控制方式，即对PFC电路进行双环控制，其中，电流环的输入为电压环的输出，电流环控制输出值最小可以为零。控制器将采集到的交流电源采样电压、交流电源采样电流、直流母线采样电压进行计算和处理以获取PFC电路的指令电流值，即电流环控制输出值，通过检测PFC电路的指令电流值，以实现对PFC电路保护控制。
S3，确定指令电流值小于等于预设电流值。
在一些实施例中，当与PFC电路连接的负载急剧减小时，负载消耗电解电容电量变小，由于PFC电路具有升压功能，导致直流母线电压将有所上升，此时PFC电压环的控制输出值将迅速减小，电流环控制输出值也将减小，最小可减为零。其中电流环控制输出值即指令电流值。
其中，设置预设电流值为零，当PFC电路启动后，实时检测PFC电路的指令电流值，当指令电流值小于等于预设电流值时，即确定指令电流值小于等于零时，则认为负载降低至很低，当出现这种情况时，直流母线采样电压会上升，需要对PFC电路进行保护。
S4，控制PFC电路进行软启动。
其中，PFC电路软启动时，控制电压值由零慢慢增加到额定电压，这样负载在启动过程中的启动电流，就由过去过载冲击电流不可控制变成为可控制，并且可根据需要调节启动电流的大小，PFC电路软启动的全过程都不存在冲击转矩，从而保证接入的负载平滑启动。
控制PFC电路进行软启动时对PFC电路重启软起动复位，即恢复至软启动初始启动参数，重新进行软启动。在一些实施例中，控制PFC电路进行软启动时，可以对PFC电路占空比进行控制，完成对PFC电路的软启动，以及在PFC电路进行软启动后，根据直流母线采样电压对PFC电路进行保护。
具体地，当PFC电路满足软启动条件时，可对PFC电路占空比进行控制，调整对PFC电路占空比控制的计算方法，控制PFC电路按照调整后的计算控制方法工作，从而完成 PFC电路的软启动。在PFC电路进行软启动后，实时检测直流母线采样电压，当出现后端负载急剧变小的情况时，直流母线采样电压会上升，当直流母线采样电压上升至满足PFC电路关闭的条件时，控制器应控制PFC电路关闭，使母线电压迅速降低，从而对PFC电路进行保护。
根据本公开一些实施例的控制变频空调PFC电路的方法，基于获取交流电源采样电压、交流电源采样电流和直流母线采样电压获得PFC电路的指令电流值。当与PFC电路连接的负载急剧减小时，母线电压的持续升高，指令电流值急剧减小，通过设置预设电流值，当确定指令电流值小于等于预设电流值时，直接控制PFC电路进行软启动，使母线电压迅速降低，避免因母线电压过高导致出现故障，影响用户使用，也能降低因母线电压过高导致后端电解电容被击穿的风险，从而实现对PFC电路的保护以及对电解电容的安全控制。
在相关技术中，当后端负载急剧降低时，若PFC电路按通常的控制策略会迅速降低PWM(Pulse Width Modulation，脉冲宽度调制)占空比，但由于后端的负载由于突然降低至很低，对电解电容的储能几乎没有消耗，这种情况下即便使占空比按通常逻辑进行跟随性降低，也将导致母线电压的持续升高，直至达到PFC电路关闭的条件时，PFC电路关闭才能使母线电压降低。而在整个过程中，PFC电路作为Boost(升压电路)，无法实现降压控制，母线电压过高可能会导致PFC电路出现故障，影响用户使用，同时也会影响后端电解电容的寿命。
在本公开的一些实施例中，如图3所示，图3为根据本发明另一个实施例的控制变频空调PFC电路的方法的流程图，其中，控制PFC电路进行软启动，即上面步骤S4包括步骤S41，具体如下。
S41，控制PFC电路以预设初始占空比运行，并在预设时长内控制PFC电路的驱动信号占空比从预设初始占空比增加至目标占空比。
在本公开的一些实施例中，先预设初始占空比，在PFC电路满足启动条件进行软启动后，控制PFC电路以预设初始占空比运行，并在预设时长内控制PFC电路的驱动信号占空比从预设初始占空比增加至目标占空比。其中，初始占空比和目标占空比均可从运行大数据中获取或者在实验室条件下进行设定。
具体地，在预设时长内，控制PFC电路的驱动信号占空比从预设初始占空比开始线性增加，直至达到目标占空比，其中，预设时长可根据需要或者在实验室条件下进行设置，以保证PFC电路的驱动信号占空比能从初始占空比稳定增加至目标占空比。当确定PFC电路达到目标占空比之后，再按照正常的电压前馈控制电压环的控制输出值、电流环的控制输出值以进行PFC电路的占空比控制。
在本公开的一些实施例中，如图4所示，图4为根据本发明又一个实施例的控制变频空调PFC电路的方法的流程图，其中，控制变频空调PFC电路的方法包括步骤S101-S110，具体如下。
S101，开始。
S102，判断PFC电路是否为软启动，若判断结果为“是”，则执行步骤S103，若判断结果为“否”，则执行步骤S107。
S103，控制PFC电路占空比从预设初始占空比增加至目标占空比。
S104，电压环、电流环和电压前馈进行PFC电路的占空比控制。
S105，判断PFC电路占空比是否达到目标占空比，若判断结果为“是”，则执行步骤S106，若判断结果为“否”，则结束流程。
S106，PFC电路软启动完成。
S107，电压环、电流环和电压前馈进行PFC电路的占空比控制。
S108，对PWM占空比进行控制。
根据本公开一些实施例的控制变频空调PFC电路的方法，通过调整对PFC电路占空比控制的计算方法，实现当后端负载急剧变小的情况下，控制PFC电路按照调整后的计算控制方法工作，无需满足PFC电路关闭的条件，也能使母线电压迅速降低，防止过压保护的发生，同时不影响电解电容的寿命。
在本公开的一些实施例中，如图5所示，图5为根据本发明又一个实施例的控制变频空调PFC电路的方法的流程图，其中，控制PFC电路进行软启动，即上面步骤S4还包括步骤S42，具体如下。
S42，根据直流母线采样电压对PFC电路进行保护。
其中，PFC电路为具有升压功能的电路，PFC电路工作时使直流母线电压升压至目标电压值，从而保证控制器的安全可靠运转，但应设定直流母线电压在限定值以下工作，当超过直流母线电压的限定值时，需关闭PFC电路或者控制变频空调停机。
在一些实施例中，控制PFC电路进行软启动过程中，实时获取直流母线采样电压，当出现后端负载急剧变小的情况时，直流母线采样电压会上升，当直流母线采样电压上升至满足PFC电路关闭的条件时，控制器应控制PFC电路关闭，使母线电压迅速降低，从而对PFC电路进行保护。
在本公开的一些实施例中，如图6所示，图6为根据本发明又一个实施例的控制变频空调PFC电路的方法的流程图，其中，根据直流母线采样电压对PFC电路进行保护，即上面步骤S42可以包括步骤S421和步骤S422，具体如下。
S421，确定直流母线采样电压大于第一电压阈值，控制变频空调停机并进行故障报警。
其中，可以设置第一电压阈值为400V。在一些实施例中，在根据直流母线采样电压对PFC电路进行保护的控制过程中，可设置直流母线电压采样电路与PFC电路连接，以采集滤波后的直流母线采样电压的数据，当确定采集到的直流母线采样电压大于第一电压阈值时，确定出现故障，立即控制PFC电路关闭，控制变频空调停机并进行报警。
S422，确定直流母线采样电压大于第二电压阈值，控制PFC电路关闭，其中，第二电压阈值小于第一电压阈值。
其中，可以设置第二电压阈值为390V，在根据直流母线采样电压对PFC电路进行保护的控制过程中，当确定采集到的直流母线采样电压大于第二电压阈值时，控制PFC电路关闭。
在本公开的一些实施例中，如图7所示，图7为根据本发明又一个实施例的控制变频空调PFC电路的方法的流程图，其中，控制变频空调PFC电路的方法包括步骤S201-S207，具体如下。
S201，开始。
S202，判断是否满足指令电流值等于零，若判断结果为“是”，则执行步骤S203，若判断结果为“否”，则执行步骤S204。
S203，PFC电路软启动参数复位，重新进行软启动。
S204，判断是否满足直流母线采样电压大于第一电压阈值，若判断结果为“是”，则执行步骤S205，若判断结果为“否”，则执行步骤S206。
S205，变频空调停机、报故障，结束运行。
S206，判断是否满足直流母线采样电压大于第二电压阈值，若判断结果为“是”，则执行步骤S207，若判断结果为“否”，则结束运行。
S207，关闭PFC电路。
根据本公开一些实施例的控制变频空调PFC电路的方法，根据采集到的直流母线采样电压确定满足关闭PFC电路条件时，控制PFC电路关闭或者控制变频空调停机井进行故障报警，以快速降低母线电压，从而实现过压保护。
在本公开的一些实施例中，如图8所示，图8为根据本发明一个实施例的控制变频空调PFC电路的装置的框图，其中，控制变频空调PFC电路的装置100包括参数获取模块101、指令电流获得模块102、确定模块104和控制模块103。
参数获取模块101用于获取交流电源输入电压、交流电源输入电流和直流母线采样电压。指令电流获得模块102用于根据交流电源输入电压、交流电源输入电流和直流母线采样电压获得PFC电路的指令电流值。确定模块104用于确定指令电流值小于等于预设电流值。控制模块103用于控制PFC电路进行软启动。
在一些实施例中，参数获取模块101获取交流电源输入电压、交流电源输入电流和直流母线采样电压后，指令电流获得模块102根据获取的交流电源输入电压、交流电源输入电流和直流母线采样电压进行计算获得PFC电路的指令电流值，并将指令电流值发送至确定模块104中。确定模块104中存储有预设电流值，确定模块104将指令电流值和预设电流值进行对比，当确定指令电流值小于等于预设电流值时，可发送信号给控制模块103，控制模块103用于控制PFC电路进行软启动。
根据本公开一些实施例的控制变频空调PFC电路的装置100，基于参数获取模块101、指令电流获得模块102和确定模块104的架构，根据采集的交流电源采样电压、交流电源采样电流和直流母线采样电压获得PFC电路的指令电流值。负载急剧变小时会导致指令电流值减小，母线电压升高。当确定指令电流值小于等于预设电流值时，由控制模块103直接控制PFC电路进行软启动，使母线电压迅速降低，避免因母线电压过高导致故障影响用户使用，也能降低因母线电压过高导致后端电解电容被击穿的风险，从而实现对PFC电路的保护以及对电解电容的安全控制。
下面参照附图9-图11对本发明第三方面实施例的变频空调进行说明。图9为根据本发明一个实施例变频空调的框图。
其中，变频空调10包括整流电路1、PFC电路2、交流电压采样电路3、交流电流采样电路4、直流母线电压采样电路5和控制器6。
整流电路1的输入端与交流电源U连接，整流电路1用于对交流电源U输入的交流电进行整流。PFC电路2的输入端与整流电路1的输出端连接。PFC电路2具有功率因数校正的功能，通过设置PFC电路可实现对流入负载的交流输入电流和直流母线电压进行功率校正，以为负载提供可靠的交流输入电流和直流母线采样电压。
交流电压采样电路3与整流电路1的输入端连接，用于检测交流电源采样电压。交流电流采样电路4与PFC电路2输出端连接，用于检测交流电源采样电流。直流母线电压采样电路5与PFC电路2的输出端连接，用于采集直流母线采样电压。
控制器6与交流电压采样电路3、交流电流采样电路4和直流母线电压采样电路5分别连接，用于根据上面任一项实施例的控制变频空调PFC电路的方法控制PFC电路2。
具体地，控制器6根据控制负载的运转情况，控制PFC电路2工作，交流电压采样电路3、交流电流采样电路4和直流母线电压采样电路5将采集到的交流电源采样电压、交流电源采样电流、直流母线采样电压输入至控制器6中，控制器6根据获取到的交流电源采样电压、交流电源采样电流和直流母线采样电压获得PFC电路2的指令电流值，并将指令电流值与预设电流值进行比较，当确定指令电流值小于等于预设电流值时，控制PFC电路2进行软启动。
根据本公开一些实施例的变频空调10，交流电压采样电路3、交流电流采样电路4和直流母线电压采样电路5分别将采集到的交流电源采样电压、交流电源采样电流和直流母线采样电压发送至控制器6，控制器6基于获取到的交流电源采样电压、交流电源采样电流和直流母线采样电压控制PFC电路2的运行状态，本发明的变频空调10基于整流电路1、PFC电路2、交流电压采样电路3、交流电流采样电路4、直流母线电压采样电路5和控制器6的架构，不改变成本，通过执行上面一些实施例的控制变频空调PFC电路的方法，对PFC电路2的控制方法进行调整，在后端负载急剧变小的情况下，控制PFC电路2能够按照调整后的计算控制方法工作，使母线电压能够迅速地降低，防止过压保护的发生，同时不影响电解电容的寿命。
在本公开的一些实施例中，如图10所示，图10为根据本发明一个实施例的PFC电路的示意图，其中，PFC电路2包括电感L1、PFC驱动电路21，功率模块22、二极管D1和电解电容C1。
其中，电感L1的第一端与整流电路1的第一输出端连接，PFC驱动电路21的输入端与控制器6连接。控制器6可基于获取到的交流电源采样电压、交流电源采样电流和直流母线采样电压控制PFC电路2的运行状态。控制器6可发送PWM信号给PFC驱动电路21，以控制PFC电路2工作。
功率模块22可以设置为一个功率器件功率，功率模块22的第一端即g端与PFC驱动电路21的输出端连接，功率模块22的第二端即C端与电感L1的第二端连接，功率模块22的第三端即E端与交流电流采样电路4、直流母线电压采样电路5分别连接。
二极管D1的正极与功率模块22的第二端连接，二极管D1的负极与直流母线电压采样电路连接。电解电容C1的第一端与二极管的负极连接，电解电容C1的第二端与功率模块22的第三端连接。
在本公开的一些实施例中，如图11所示，图11为根据本发明一个实施例的变频空调的示意图，其中，本公开一些实施例的变频空调10可采用通用的PFC控制拓扑结构，交流电压采样电路3与整流电路1的输出端连接，用于采集输入PFC电路2的交流电源采样电压并发送至控制器6中，在整机工作时，控制器6根据交流输入电压产生PWM信号给PFC驱动电路21，以控制PFC电路2工作。交流电流采样电路4与电阻R以及功率模块22的输出端连接，将采集到的交流电源采样电流发送至控制器6中。直流母线电压采样电路5与直流母线以及电解电容C1连接，并将采集到的直流母线采样电压发送至控制器6中，控制器6根据获取到的交流电源采样电压、交流电源采样电流和直流母线采样电压获得PFC电路2的指令电流值，并将指令电流值与预设电流值进行比较，当确定指令电流值小于等于预设电流值时，控制PFC电路2进行软启动。
在本公开的一些实施例中，还提出一种非临时性计算机可读存储介质，其上存储有计算机程序，计算机程序被处理器执行时实现上面任一项实施例的控制变频空调PFC电路的方法。
根据本公开一些实施例的计算机可读存储介质，其上存储有计算机程序，计算机程序被执行时能读取指令以及获取变频空调中各部件的运行参数，并对运行参数等进行计算和处理，且对变频空调中各部件的运行状态具有记忆性，从而实现上面任一项控制变频空调PFC电路的方法，在后端负载急剧变小的情况下，使母线电压能够迅速地降低，从而实现对PFC电路的保护，同时不影响电解电容的寿命。
根据本公开一些实施例的变频空调器10以及PFC电路2的其他构成以及操作对于本领域普通技术人员而言都是已知的，这里不再详细描述。
此外，在本公开各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。
上述提到的存储介质可以是只读存储器，磁盘或光盘等。尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。
尽管已经示出和描述了本公开的实施例，本领域的普通技术人员可以理解：在不脱离本公开的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本公开的范围由权利要求及其等同物限定。

Claims (13)

  1. 一种空调器，其中，包括压缩机、蒸发器、冷凝器，所述压缩机与所述蒸发器、所述冷凝器通过管路相连，所述空调器还包括：
    整流电路，所述整流电路的输入端与交流电源连接；
    PFC电路，所述PFC电路的输入端与所述整流电路的输出端连接；
    交流电压采样电路，所述交流电压采样电路与所述整流电路的输入端连接，被配置为检测交流电源采样电压；
    交流电流采样电路，所述交流电流采样电路与所述PFC电路输出端连接，被配置为检测交流电源采样电流；
    直流母线电压采样电路，所述直流母线电压采样电路与所述PFC电路的输出端连接，被配置为采集直流母线采样电压；
    控制器，所述控制器与所述交流电压采样电路、所述交流采样电路和所述直流母线电压采样电路分别连接；
    所述控制器被配置为基于所述交流电源采样电压、所述交流电源采样电流和所述直流母线采样电压确定指令电流值，若所述指令电流值小于等于预设电流值，在预设时长内控制输入至所述PFC电路的驱动信号的占空比从预设初始占空比增加至目标占空比。
  2. 根据权利要求1所述的空调器，其中，所述预设电流值为零。
  3. 根据权利要求1所述的空调器，其中，所述控制器被配置为控制输入至所述PFC电路的驱动信号的占空比从所述预设初始占空比线性增加至目标占空比。
  4. 根据权利要求1所述的空调器，其中，所述控制器被配置为确定所述直流母线采样电压大于第一电压阈值时，控制所述压缩机停机运行。
  5. 根据权利要求1所述的空调器，其中，所述控制器被配置为确定所述直流母线采样电压大于第二电压阈值，控制所述PFC电路关闭，其中，所述第二电压阈值小于第一电压阈值。
  6. 根据权利要求1所述的空调器，其中，所述PFC电路被配置为对直流母线电压进行升压。
  7. 根据权利要求6所述的空调器，其中，所述PFC电路包括：
    电感，所述电感的第一端与所述整流电路的第一输出端连接；
    PFC驱动电路，所述PFC驱动电路的输入端与所述控制器连接；
    功率模块，所述功率模块的第一端与所述PFC驱动电路的输出端连接，所述功率模块的第二端与所述电感的第二端连接，所述功率模块的第三端与所述交流电流采样电路、所述直流母线电压采样电路分别连接；
    二极管，所述二极管的正极与所述功率模块的第二端连接，所述二极管的负极与所述直流母线电压采样电路连接；
    电解电容，所述电解电容的第一端与所述二极管的负极连接，所述电解电容的第二端与所述功率模块的第三端连接。
  8. 根据权利要求4或5任一项所述的空调器，其中，所述控制器被配置为在控制所述PFC电路的驱动信号占空比以所述目标占空比运行时，确定所述直流母线采样电压与第一电压阈值或第二电压阈值的大小关系。
  9. 一种用于空调器的PFC电路的控制方法，其中，所述控制方法包括：
    获取交流电源采样电压、交流电源采样电流和直流母线采样电压；
    根据所述交流电源采样电压、所述交流电源采样电流和所述直流母线采样电压确定PFC电路的指令电流值；
    确定所述指令电流值小于等于预设电流值；
    在预设时长内控制输入至所述PFC电路的驱动信号的占空比从预设初始占空比增加至目标占空比。
  10. 根据权利要求9所述的控制方法，其中，所述预设电流值为零。
  11. 根据权利要求9所述的控制方法，其中，在所述预设时长内控制输入至所述PFC电路的驱动信号的占空比从所述预设初始占空比线性增加至所述目标占空比。
  12. 根据权利要求9所述的控制方法，其中，确定所述直流母线采样电压大于第一电压阈值，控制压缩机停机运行。
  13. 根据权利要求9所述的控制方法，其中，确定所述直流母线采样电压大于第二电压阈值，控制所述PFC电路关闭，其中，第二电压阈值小于第一电压阈值。
PCT/CN2022/103191 2021-07-26 2022-06-30 空调器和用于空调器的pfc电路的控制方法 WO2023005594A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305803A (zh) * 2015-10-26 2016-02-03 华南理工大学 Boost pfc变换器启动输出电压防过冲数字控制方法
CN108075633A (zh) * 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 功率因数校正电路的软启动方法、装置、电路及电器
CN113162395A (zh) * 2021-05-10 2021-07-23 海信（山东）空调有限公司 变频空调器pfc控制方法和控制装置及变频空调器
CN113612378A (zh) * 2021-07-26 2021-11-05 海信（山东）空调有限公司 控制变频空调pfc电路的方法和装置及空调和存储介质

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305803A (zh) * 2015-10-26 2016-02-03 华南理工大学 Boost pfc变换器启动输出电压防过冲数字控制方法
CN108075633A (zh) * 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 功率因数校正电路的软启动方法、装置、电路及电器
CN113162395A (zh) * 2021-05-10 2021-07-23 海信（山东）空调有限公司 变频空调器pfc控制方法和控制装置及变频空调器
CN113612378A (zh) * 2021-07-26 2021-11-05 海信（山东）空调有限公司 控制变频空调pfc电路的方法和装置及空调和存储介质

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