WO2017152573A1 - Air conditioner, and shutdown control method and device for compressor thereof - Google Patents

Air conditioner, and shutdown control method and device for compressor thereof Download PDF

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Publication number
WO2017152573A1
WO2017152573A1 PCT/CN2016/092356 CN2016092356W WO2017152573A1 WO 2017152573 A1 WO2017152573 A1 WO 2017152573A1 CN 2016092356 W CN2016092356 W CN 2016092356W WO 2017152573 A1 WO2017152573 A1 WO 2017152573A1
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WIPO (PCT)
Prior art keywords
compressor
phase
current
power switch
phase current
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PCT/CN2016/092356
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French (fr)
Chinese (zh)
Inventor
黄招彬
张国柱
朱良红
Original Assignee
广东美的制冷设备有限公司
美的集团股份有限公司
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Publication of WO2017152573A1 publication Critical patent/WO2017152573A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/24—Arrangements for stopping

Definitions

  • the invention relates to the technical field of air conditioners, in particular to a shutdown control method for a compressor in an air conditioner, a shutdown control device for a compressor in an air conditioner, and an air conditioner.
  • the compressor can only be controlled by the control method without the speed sensor.
  • this method cannot achieve closed-loop control at low speeds. Therefore, the shutdown process of the inverter air conditioner is generally stopped directly by the compressor or down-clocked to the low-frequency operation, and cannot be directly down-converted to zero speed.
  • the drive signal for controlling the compressor stops outputting, and the current of the compressor immediately becomes zero.
  • the compressor Under the action of the pipeline refrigerant pressure, the compressor is free. Stop.
  • the compressor may oscillate and attenuate, causing vibration of the piping and affecting the stress of the piping.
  • an object of the present invention is to provide a shutdown control method for a compressor in an air conditioner, which generates a braking torque by controlling a driving circuit of the compressor to short-circuit the three-phase windings of the compressor, and speeds up compression.
  • the rotor of the machine brakes so that the compressor can brake quickly and stand still, which helps to reduce the stress of the piping in the air conditioner and improve the service life of the piping in the air conditioner.
  • Another object of the present invention is to provide a shutdown control device for a compressor in an air conditioner. Still another object of the present invention is to provide an air conditioner.
  • an embodiment of the present invention provides a shutdown control method for a compressor in an air conditioner
  • the drive circuit of the compressor includes six power switch tubes
  • the six power switch tubes form a three-phase bridge.
  • An arm, a first one of the three-phase bridge arms has a first node
  • a second one of the three-phase bridge arms has a second node
  • a third one of the three-phase bridge arms has a first a three node
  • the first node, the second node, and the third node are connected to a three-phase winding of the compressor
  • each of the six power switch tubes is anti-parallel a diode
  • the method comprising the steps of: controlling an upper bridge power switch of each of the three-phase bridge arms to be turned off when a compressor stop signal is received during shutdown of the air conditioner, and Using a PWM (Pulse Width Modulation) signal to control the lower bridge power switch tubes of each of the three-phase bridge arms to be simultaneously turned on or off at the same time
  • the upper bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is adopted.
  • Control the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or control the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm to be turned off, and use PWM signal to control each phase bridge arm
  • the upper bridge power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, and adjust the duty ratio of the PWM signal according to the three-phase current peak value of the compressor and the preset compressor phase current limit threshold value.
  • the duty ratio of the PWM signal is decreased; when the compressor is three Increasing the duty cycle of the PWM signal when the phase current peak is less than the preset compressor phase current limit threshold.
  • the phase current of the compressor is detected by a current sensor to obtain a three-phase current of the compressor, or the phase current of the compressor is detected by at least one current sampling resistor To obtain the three-phase current of the compressor.
  • the motor in the compressor is a permanent magnet synchronous motor or a permanent magnet brushless DC motor.
  • a shutdown control device for a compressor in an air conditioner comprising: a drive circuit, the drive circuit includes six power switch tubes, and the six power switch tubes constitute a three-phase bridge arm, a first one of the three-phase bridge arms having a first node, a second one of the three-phase bridge arms having a second node, and a third of the three-phase bridge arms
  • the arm has a third node, the first node, the second node and the third node are correspondingly connected to a three-phase winding of the compressor, and each of the six power switching tubes
  • the anti-parallel has a diode; a control module, wherein the control module is configured to control the upper bridge power switch of each of the three-phase bridge arms to be turned off when receiving the compressor stop signal, and adopt PWM signal control
  • the lower bridge power switch tubes of each of the three-phase bridge arms are turned on or off at the same time, or the power switches of the lower bridges of each of the three-phase
  • the control module when receiving the compressor stop signal, controls the upper bridge power switch of each of the three-phase bridge arms to be turned off, and adopts The PWM signal controls the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is used to control each phase bridge.
  • the upper bridge power switch tube of the arm is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor, and adjust the PWM signal according to the peak value of the three-phase current of the compressor and the preset compressor phase current limit threshold.
  • the control module decreases a duty ratio of the PWM signal;
  • the control module increases the duty cycle of the PWM signal when the three-phase current peak of the compressor is less than the preset compressor phase current limit threshold.
  • the control module detects a phase current of the compressor by a current sensor to obtain a three-phase current of the compressor, or a compressor of the compressor through at least one current sampling resistor The phase current is detected to obtain a three-phase current of the compressor.
  • the motor in the compressor is a permanent magnet synchronous motor or a permanent magnet brushless DC motor.
  • an embodiment of the present invention also proposes an air conditioner including the above-described shutdown control device for a compressor in an air conditioner.
  • the air conditioner according to the embodiment of the present invention through the above-described shutdown control device of the compressor in the air conditioner, when the compressor stop signal is received during the shutdown of the air conditioner, by controlling the drive circuit of the compressor to make the compressor
  • the three-phase winding is short-circuited to generate braking torque, which accelerates the rotor braking of the compressor, thereby achieving rapid braking and stationary of the compressor, helping to reduce the stress of the piping in the air conditioner and improving the service life of the piping in the air conditioner.
  • FIG. 1 is a flow chart of a method of controlling a shutdown of a compressor in an air conditioner according to an embodiment of the present invention.
  • FIG. 2 is a control circuit topology diagram of a compressor in an air conditioner according to an embodiment of the present invention.
  • FIG. 3 is a control circuit topology diagram of a compressor in an air conditioner according to another embodiment of the present invention.
  • FIG. 4 is a control circuit topology diagram of a compressor in an air conditioner according to still another embodiment of the present invention.
  • Figure 5 is a control circuit topology diagram of a compressor in an air conditioner according to still another embodiment of the present invention.
  • Figure 6 is a waveform diagram of a compressor drive signal in accordance with one embodiment of the present invention.
  • Figure 7 is a waveform diagram of response currents of compressor braking in accordance with one embodiment of the present invention.
  • FIG. 1 is a flow chart of a method of controlling a shutdown of a compressor in an air conditioner according to an embodiment of the present invention.
  • the driving circuit of the compressor includes six power switching tubes, and the six power switching tubes constitute a three-phase bridge arm, and the first one of the three-phase bridge arms has a first node, a second one of the three-phase bridge arms has a second node, and a third one of the three-phase bridge arms has a third node, the first node, the second node, and the third node corresponding to the compressor Three-phase windings are connected, and each of the six power switching tubes has a diode in anti-parallel.
  • the control module outputs a compressor drive signal to the drive circuit of the compressor to control the turning on and off of the six power switch tubes in the drive circuit to control the operation of the compressor.
  • the six power switch tubes may be an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), and each power switch tube is further Anti-parallel has a diode. It can be understood that, in the embodiment of the present invention, the driving circuit of the compressor can also directly adopt an IPM (Intelligent Power Module).
  • IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • the shutdown control method of the compressor in the air conditioner includes the following steps:
  • the upper bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is used to control the three-phase bridge arm
  • the lower bridge power switch tube of each phase bridge arm is turned on or off at the same time, or the power switch tube of each bridge arm of each phase of the three-phase bridge arm is turned off, and the PWM signal is used to control the three-phase bridge arm.
  • the upper bridge power switch tube of each phase bridge arm is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor.
  • the control module before the compressor receives the stop signal, the control module outputs an SVPWM (Space Vector Pulse Width Modulation) signal with automatic closed loop adjustment (the dead time is ignored in the figure) To control the turning on and off of the six power switching tubes in the driving circuit of the compressor to make the compressor operate normally.
  • SVPWM Space Vector Pulse Width Modulation
  • the control module controls the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm to be turned off, and uses the same PWM signal to control the lower bridge of each phase bridge arm of the three-phase bridge arm
  • the power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U+/V+/W+ three-way drive signal is set to a low level, and the U-/V-/W- three-way drive signal is set to The same PWM signal, in which the three-phase winding of the compressor is short-circuited through three lower-bridge power switching tubes and their anti-parallel diodes during the simultaneous opening of the three lower-bridge power switching tubes.
  • the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned off, and the same PWM signal is used to control the upper bridge of each phase bridge arm of the three-phase bridge arm
  • the power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U-/V-/W- three-way drive signal is set to a low level, and the U+/V+/W+ three-way drive signal is set to The same PWM signal, in which the three-phase winding of the compressor is short-circuited by three upper-bridge power switching tubes and their anti-parallel diodes during the simultaneous opening of the three upper-bridge power switching tubes.
  • the phase current of the compressor may be detected by a current sensor to obtain a three-phase current of the compressor, or the phase current of the compressor may be detected by at least one current sampling resistor to obtain a compressor. Three-phase current.
  • the phase current of the compressor can be detected by a current sensor connected to the three-phase winding (or two-phase winding) of the compressor to obtain the three-phase current of the compressor, and according to the compression
  • the three-phase current of the machine calculates the three-phase current peak of the compressor.
  • the phase current of the compressor is detected by three current sampling resistors (or two current sampling resistors) to obtain the three-phase current of the compressor, and the compression is calculated according to the three-phase current of the compressor.
  • the three-phase current peak of the machine is Alternatively, as shown in FIG. 5, the phase current of the compressor is detected by a single current sampling resistor to obtain a three-phase current of the compressor, and the three-phase current peak of the compressor is calculated according to the three-phase current of the compressor.
  • the duty cycle of the PWM signal when the peak value of the three-phase current of the compressor is greater than a preset compressor phase current limiting threshold, the duty cycle of the PWM signal is decreased; when the peak value of the three-phase current of the compressor is less than a preset compression When the phase current limit threshold is reached, the duty cycle of the PWM signal is increased.
  • the preset compressor phase current limiting threshold is used as a given value, and the three-phase current peak of the compressor is used as a feedback value, when the three-phase current peak of the compressor is greater than the compression.
  • the duty cycle of the control PWM signal is reduced; when the peak value of the three-phase current of the compressor is less than the threshold voltage of the compressor phase current, the control The duty ratio of the PWM signal is increased to achieve closed-loop regulation of the PWM signal, so that the peak value of the three-phase current of the compressor does not exceed the compressor phase current limiting threshold, thereby realizing the limitation of the braking current.
  • the duty ratio of the PWM signal may be adjusted by a rod controller or a proportional-integral controller, wherein the rod controller or the proportional-integral controller is given a value
  • the feedback value of the rod controller or the proportional-integral controller is the three-phase current peak of the compressor.
  • the parameters of the proportional-integral controller can be consistent with the current loop parameters of the compressor.
  • the motor in the compressor may be a permanent magnet synchronous motor or a permanent magnet brushless DC motor. Due to the action of the permanent magnets in the permanent magnet synchronous motor or the permanent magnet brushless DC motor, when the three-phase winding is short-circuited, the rotor of the compressor rotates to generate a back electromotive force, and the back-EM potential generates a phase current under the action of the rotor resistance and the inductance ( Brake current), the phase current produces a reverse braking torque to control the rotor braking of the compressor.
  • the braking torque can be generated by short-circuiting the three-phase windings, and the braking of the compressor rotor is accelerated, thereby achieving rapid braking and stationary of the compressor.
  • the drive signal of the compressor after receiving the stop signal of the compressor, the drive signal of the compressor is not directly turned off, so that the current of the compressor is zero, and is free under the action of the pipeline refrigerant pressure and the like. Stopping, but by shorting the three-phase winding of the compressor to generate braking current, accelerate the braking of the compressor, thereby quickly reaching a completely static state, effectively reducing the vibration and stress of the piping after the compressor current is stopped, thereby improving The service life of the piping in the air conditioner.
  • the compression is triggered.
  • the machine stops the signal, and the control module outputs a corresponding driving signal to the driving circuit of the compressor.
  • Figure 7 shows the response current waveform (95% high duty cycle and 70% low duty cycle) for compressor braking using a rod controller, where the preset compressor phase current limiting threshold is 10A. It can be seen from Fig. 7 that after the compressor receives the stop signal, the duty ratio of the PWM signal is automatically adjusted, so that the actual three-phase current peak of the compressor is about 12A, which basically achieves the purpose of limiting the compressor braking current.
  • the compressor Short-circuiting of the three-phase windings; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper-bridge power switching tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor Short-circuiting of the three-phase windings; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper-bridge power switching tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor The three-phase winding is shorted.
  • the drive circuit of the compressor can be controlled by using a PWM signal with a constant duty ratio of 100%, for example, an upper bridge power switch tube for controlling each of the three-phase bridge arms Both are turned off, and the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned on, that is, the U+/V+/W+ three-way drive signal is set to a low level, U-/V-/W-three
  • the drive signal is set high, so that the three-phase winding of the compressor passes through three lower-bridge power switches and The anti-parallel diodes form a short circuit.
  • the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned on, and the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is controlled to be turned off, that is, U+/V+/W+3
  • the drive signal is set to a high level, and the U-/V-/W- three-way drive signal is set low, so that the three-phase winding of the compressor is short-circuited by three upper-bridge power switch tubes and their anti-parallel diodes.
  • the shutdown control method of the compressor in the air conditioner when receiving the compressor stop signal, is turned off by controlling the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm And use PWM signal to control the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or to control the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm to be turned off, and adopt PWM signal control
  • the upper bridge power switch tube of each phase bridge is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor, and adjust the PWM according to the peak value of the three-phase current of the compressor and the preset compressor phase current limit threshold.
  • the rapid braking and static of the compressor helps to reduce the stress in the air conditioner and improve the service life of the piping in the air conditioner.
  • FIG. 2 to 5 are topological views of a control circuit of a compressor in an air conditioner according to an embodiment of the present invention.
  • the shutdown control device of the compressor in the air conditioner includes a drive circuit 10 and a control module 20.
  • the driving circuit 10 includes six power switching tubes, and the six power switching tubes form a three-phase bridge arm.
  • the first one of the three-phase bridge arms has a first node J1, and the second one of the three-phase bridge arms Having a second node J2, the third of the three-phase bridge arms has a third node J3, and the first node J1, the second node J2, and the third node J3 are connected to the three-phase winding of the compressor, and six powers
  • Each of the power switch tubes in the switch tube has a diode in anti-parallel.
  • the six power switch tubes can be IGBTs or MOSFETs, and each power switch tube also has a diode in anti-parallel. It can be understood that in the embodiment of the present invention, the driving circuit of the compressor can also directly adopt the IPM.
  • the control module 20 is configured to control the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm to be turned off when receiving the compressor stop signal, and use the PWM signal to control the lower arm of each phase of the three-phase bridge arm
  • the bridge power switch tube is turned on or off at the same time, or the power switch tube of each bridge arm of each phase of the three-phase bridge arm is turned off, and the PWM signal is used to control the upper arm of each phase of the three-phase bridge arm.
  • the bridge power switch tube is simultaneously turned on or off at the same time to control the three-phase winding short circuit of the compressor, and is used for obtaining the three-phase current of the compressor, and obtaining the three-phase current peak of the compressor according to the three-phase current of the compressor.
  • the control module 20 before the compressor receives the stop signal, the control module 20 outputs an automatic closed-loop regulated SVPWM signal (the dead time is omitted in the figure) to control six of the drive circuits 10 of the compressor. Power switch tube Turn on and off to allow the compressor to operate normally.
  • the control module 20 controls the upper bridge power switch tubes of each phase bridge arm of the three-phase bridge arm to be turned off, and uses the same PWM signal to control the lower arm of each phase of the three-phase bridge arms.
  • the bridge power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U+/V+/W+ three-way drive signal is set to a low level, and the U-/V-/W- three-way drive signal is set.
  • the control module 20 controls the lower bridge power switch tubes of each of the three-phase bridge arms to be turned off, and uses the same PWM signal to control each of the three-phase bridge arms.
  • the upper bridge power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U-/V-/W- three-way drive signal is set to a low level, U+/V+/W+ three-way drive
  • the signal is set to the same PWM signal, wherein during the simultaneous opening of the three upper bridge power switches, the three-phase winding of the compressor is short-circuited by three upper bridge power switches and their anti-parallel diodes.
  • control module 20 detects the phase current of the compressor by a current sensor to obtain a three-phase current of the compressor, or detects the phase current of the compressor by at least one current sampling resistor to obtain compression. Three-phase current of the machine.
  • the phase current of the compressor can be detected by a current sensor connected to the three-phase winding (or two-phase winding) of the compressor to obtain the three-phase current of the compressor, and according to the compression
  • the three-phase current of the machine calculates the three-phase current peak of the compressor.
  • the phase current of the compressor is detected by three current sampling resistors (or two current sampling resistors) to obtain the three-phase current of the compressor, and the compression is calculated according to the three-phase current of the compressor.
  • the three-phase current peak of the machine is Alternatively, as shown in FIG. 5, the phase current of the compressor is detected by a single current sampling resistor to obtain a three-phase current of the compressor, and the three-phase current peak of the compressor is calculated according to the three-phase current of the compressor.
  • the control module 20 also adjusts the duty ratio of the PWM signal according to the three-phase current peak value of the compressor and the preset compressor phase current limiting threshold to adjust the braking current when the three-phase winding of the compressor is short-circuited, and according to the braking The current generates a braking torque to control the rotor braking of the compressor to stop the compressor.
  • the control module 20 when the three-phase current peak of the compressor is greater than a preset compressor phase current limiting threshold, the control module 20 reduces the duty cycle of the PWM signal; when the three-phase current peak of the compressor is less than the pre- When the compressor phase current limiting threshold is set, the control module 20 increases the duty cycle of the PWM signal.
  • the control module 20 takes the preset compressor phase current limiting threshold as a given value, and uses the three-phase current peak of the compressor as a feedback value, when the three-phase current of the compressor When the peak value is greater than the compressor phase current limiting threshold, the control module 20 controls the duty cycle of the PWM signal to decrease; when the three-phase current peak of the compressor is less than the compressor phase current limiting threshold, the control module 20 controls the PWM signal.
  • the air ratio is increased, and the closed-loop adjustment of the PWM signal is realized, so that the peak value of the three-phase current of the compressor does not exceed the limit value of the compressor phase current limit, thereby realizing the limitation of the braking current.
  • the stick controller or proportional-integral in the control module 20 may be The controller adjusts the duty cycle of the PWM signal, wherein the given value of the rod controller or the proportional-integral controller is the compressor phase current limiting threshold, the feedback value of the rod controller or the proportional-integral controller The peak value of the three-phase current of the compressor.
  • the feedback value is greater than the given value, the low duty cycle PWM signal is output; when the feedback value is less than the given value, the high duty cycle PWM signal is output.
  • the parameters of the proportional-integral controller can be consistent with the current loop parameters of the compressor.
  • the motor in the compressor may be a permanent magnet synchronous motor or a permanent magnet brushless DC motor. Due to the action of the permanent magnets in the permanent magnet synchronous motor or the permanent magnet brushless DC motor, when the three-phase winding is short-circuited, the rotor of the compressor rotates to generate a back electromotive force, and the back-EM potential generates a phase current under the action of the rotor resistance and the inductance ( Brake current), the phase current produces a reverse braking torque to control the rotor braking of the compressor.
  • the braking torque can be generated by short-circuiting the three-phase windings, and the braking of the compressor rotor is accelerated, thereby achieving rapid braking and stationary of the compressor.
  • the drive signal of the compressor after receiving the stop signal of the compressor, the drive signal of the compressor is not directly turned off, so that the current of the compressor is zero, and is free under the action of the pipeline refrigerant pressure and the like. Stopping, but by shorting the three-phase winding of the compressor to generate braking current, accelerate the braking of the compressor, thereby quickly reaching a completely static state, effectively reducing the vibration and stress of the piping after the compressor current is stopped, thereby improving The service life of the piping in the air conditioner.
  • the compression is triggered.
  • the machine stops the signal, and the control module 20 outputs a corresponding driving signal to the driving circuit of the compressor.
  • Figure 7 shows the response current waveform (95% high duty cycle and 70% low duty cycle) for compressor braking using a rod controller, where the preset compressor phase current limiting threshold is 10A. It can be seen from Fig. 7 that after the compressor receives the stop signal, the duty ratio of the PWM signal is automatically adjusted, so that the actual three-phase current peak of the compressor is about 12A, which basically achieves the purpose of limiting the compressor braking current.
  • the compressor Short-circuiting of the three-phase windings; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper-bridge power switching tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor Short-circuiting of the three-phase windings; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper-bridge power switching tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor The three-phase winding is shorted.
  • the control module 20 can control the drive circuit of the compressor with a PWM signal having a constant duty ratio of 100%.
  • the control module 20 controls each of the three-phase bridge arms.
  • the upper bridge power switch tubes are all turned off, and the lower bridge power switch tubes of each phase bridge arm in the three-phase bridge arms are controlled to be turned on, that is, the U+/V+/W+ three-way drive signals are set to a low level, U-/ The V-/W- three-way drive signal is set high, so that the three-phase winding of the compressor is short-circuited by three lower-bridge power switch tubes and their anti-parallel diodes.
  • control module 20 controls the upper bridge power switch tubes of each of the three-phase bridge arms to be turned on, and controls the lower bridge power switch tubes of each of the three-phase bridge arms to be turned off, that is, U+/V+
  • the /W+ three-way drive signal is set high, and the U-/V-/W- three-way drive signal is set low, so that the three-phase winding of the compressor passes through three upper-bridge power switch tubes and their anti-parallel diodes. Short-circuited.
  • the control module when receiving the compressor stop signal, controls the upper bridge power switch of each of the three-phase bridge arms to be turned off, and adopts The PWM signal controls the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is used to control each phase bridge.
  • the upper bridge power switch tube of the arm is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor, and adjust the PWM signal according to the peak value of the three-phase current of the compressor and the preset compressor phase current limit threshold.
  • an embodiment of the present invention also proposes an air conditioner including the above-described shutdown control device for a compressor in an air conditioner.
  • the air conditioner according to the embodiment of the present invention through the above-described shutdown control device of the compressor in the air conditioner, when the compressor stop signal is received during the shutdown of the air conditioner, by controlling the drive circuit of the compressor to make the compressor
  • the three-phase winding is short-circuited to generate braking torque, which accelerates the rotor braking of the compressor, thereby achieving rapid braking and stationary of the compressor, helping to reduce the stress of the piping in the air conditioner and improving the service life of the piping in the air conditioner.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may include one or more of the features either explicitly or implicitly.
  • the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements.
  • installation can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or below the second feature, or merely represents the first feature. The level of the sign is less than the second feature.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Control Of Ac Motors In General (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

An air conditioner, and a shutdown control method and device for a compressor thereof. The method comprises: when receiving a compressor shutdown signal, controlling upper-bridge power switching transistors in all phases of a three-phase bridge arm to be turned off and controlling, by using a PWM signal, lower-bridge power switching transistors in all phases to be turned on or off simultaneously; or controlling lower-bridge power switching transistors in all phases to be turned off and controlling, by using a PWM signal, upper-bridge power switching transistors in all phases to be turned on or off simultaneously, thereby controlling a three-phase winding of the compressor to be shorted (S1); obtaining a peak value of a three-phase current of the compressor (S2); adjusting a duty ratio of the PWM signal according to the peak value of the three-phase current and a phase current limiting threshold of the compressor, to adjust a braking current when the three-phase winding is shorted (S3); and generating a brake torque according to the brake current, to control the braking of a rotor of the compressor, thereby shutting down the compressor (S4). The method can implement quick braking and stilling of a compressor, facilitate reduction of pipe stress in an air conditioner, and improve the service life of pipes in the air conditioner.

Description

空调器及其压缩机的停机控制方法和装置Air conditioner and compressor thereof shutdown control method and device 技术领域Technical field
本发明涉及空调器技术领域，特别涉及一种空调器中压缩机的停机控制方法、一种空调器中压缩机的停机控制装置以及一种空调器。The invention relates to the technical field of air conditioners, in particular to a shutdown control method for a compressor in an air conditioner, a shutdown control device for a compressor in an air conditioner, and an air conditioner.
背景技术Background technique
在变频空调器中，由于无法直接检测压缩机的转子转速，因而只能采用无速度传感器的控制方法对压缩机进行控制。但是，该方法无法在低速时实现闭环控制。因此，变频空调器的停机过程一般采用压缩机直接停机或者降频至低频运行后直接停机，而无法直接降频运行至零速。In the inverter air conditioner, since the rotor speed of the compressor cannot be directly detected, the compressor can only be controlled by the control method without the speed sensor. However, this method cannot achieve closed-loop control at low speeds. Therefore, the shutdown process of the inverter air conditioner is generally stopped directly by the compressor or down-clocked to the low-frequency operation, and cannot be directly down-converted to zero speed.
例如，在空调器的停机过程中，当接收到压缩机的停止信号后，控制压缩机的驱动信号停止输出，压缩机的电流立即变为零，在管路冷媒压力等作用下，压缩机自由停机。但由于冷媒压力的作用，压缩机可能振荡衰减停机，从而造成配管振动，影响配管的应力。For example, during the shutdown of the air conditioner, after receiving the stop signal of the compressor, the drive signal for controlling the compressor stops outputting, and the current of the compressor immediately becomes zero. Under the action of the pipeline refrigerant pressure, the compressor is free. Stop. However, due to the pressure of the refrigerant, the compressor may oscillate and attenuate, causing vibration of the piping and affecting the stress of the piping.
发明内容Summary of the invention
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本发明的一个目的在于提出一种空调器中压缩机的停机控制方法，该方法通过控制压缩机的驱动电路以使压缩机的三相绕组短接来产生制动转矩，加快压缩机的转子制动，从而使得压缩机能够快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, an object of the present invention is to provide a shutdown control method for a compressor in an air conditioner, which generates a braking torque by controlling a driving circuit of the compressor to short-circuit the three-phase windings of the compressor, and speeds up compression. The rotor of the machine brakes, so that the compressor can brake quickly and stand still, which helps to reduce the stress of the piping in the air conditioner and improve the service life of the piping in the air conditioner.
本发明的另一个目的在于提出一种空调器中压缩机的停机控制装置。本发明的又一个目的在于提出一种空调器。Another object of the present invention is to provide a shutdown control device for a compressor in an air conditioner. Still another object of the present invention is to provide an air conditioner.
为实现上述目的，本发明一方面实施例提出了一种空调器中压缩机的停机控制方法，所述压缩机的驱动电路包括六个功率开关管，所述六个功率开关管构成三相桥臂，所述三相桥臂中的第一桥臂具有第一节点，所述三相桥臂中的第二桥臂具有第二节点，所述三相桥臂中的第三桥臂具有第三节点，所述第一节点、所述第二节点和所述第三节点对应与所述压缩机的三相绕组相连，且所述六个功率开关管中的每个功率开关管反并联有二极管，所述方法包括以下步骤：在空调器的停机过程中，当接收到压缩机停止信号时，通过控制所述三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM(Pulse Width Modulation，脉冲宽度调制)信号控制所述三相桥臂中每相桥臂的下桥功率开关管同时导通或同时关断，或者通过控制所述三相桥臂中每相桥臂的下桥功率开关管均关断、并采用所述PWM信号控制所述三相桥臂中每相桥臂的上桥功率开关管同时导通或同时关断，以控制所述压缩机的 三相绕组短接；获取所述压缩机的三相电流，并根据所述压缩机的三相电流获取所述压缩机的三相电流峰值；根据所述压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节所述PWM信号的占空比，以调节所述压缩机的三相绕组短接时的制动电流；根据所述制动电流生成制动转矩以控制所述压缩机的转子制动，以使所述压缩机停止运行。In order to achieve the above object, an embodiment of the present invention provides a shutdown control method for a compressor in an air conditioner, the drive circuit of the compressor includes six power switch tubes, and the six power switch tubes form a three-phase bridge. An arm, a first one of the three-phase bridge arms has a first node, a second one of the three-phase bridge arms has a second node, and a third one of the three-phase bridge arms has a first a three node, the first node, the second node, and the third node are connected to a three-phase winding of the compressor, and each of the six power switch tubes is anti-parallel a diode, the method comprising the steps of: controlling an upper bridge power switch of each of the three-phase bridge arms to be turned off when a compressor stop signal is received during shutdown of the air conditioner, and Using a PWM (Pulse Width Modulation) signal to control the lower bridge power switch tubes of each of the three-phase bridge arms to be simultaneously turned on or off at the same time, or by controlling each of the three-phase bridge arms Bridge lower power switch Off, and the PWM signal to control the use of the three-phase power bridge arm on the bridge phase arm each switch are simultaneously turned on or turned off simultaneously, to control the compressor Short-circuiting a three-phase winding; acquiring a three-phase current of the compressor, and acquiring a three-phase current peak of the compressor according to a three-phase current of the compressor; according to a peak value of the three-phase current of the compressor and a preset a compressor phase current limiting threshold adjusts a duty ratio of the PWM signal to adjust a braking current when the three-phase winding of the compressor is short-circuited; generating a braking torque according to the braking current to control the The rotor of the compressor is braked to stop the compressor.
根据本发明实施例的空调器中压缩机的停机控制方法，当接收到压缩机停止信号时，通过控制三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制每相桥臂的下桥功率开关管同时导通或关断，或者通过控制三相桥臂中每相桥臂的下桥功率开关管均关断、并采用PWM信号控制每相桥臂的上桥功率开关管同时导通或关断，以控制压缩机的三相绕组短接，并根据压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节PWM信号的占空比，以调节压缩机的三相绕组短接时的制动电流，以及根据制动电流生成制动转矩以控制压缩机的转子制动，以使压缩机停止运行，从而实现压缩机的快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。According to the shutdown control method of the compressor in the air conditioner according to the embodiment of the present invention, when the compressor stop signal is received, the upper bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is adopted. Control the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or control the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm to be turned off, and use PWM signal to control each phase bridge arm The upper bridge power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, and adjust the duty ratio of the PWM signal according to the three-phase current peak value of the compressor and the preset compressor phase current limit threshold value. In order to adjust the braking current when the three-phase winding of the compressor is short-circuited, and generate braking torque according to the braking current to control the rotor braking of the compressor, so that the compressor stops running, thereby realizing rapid compressor operation. Dynamic and static, help to reduce the piping stress in the air conditioner and improve the service life of the piping in the air conditioner.
根据本发明的一个实施例，当所述压缩机的三相电流峰值大于所述预设的压缩机相电流限幅阈值时，降低所述PWM信号的占空比；当所述压缩机的三相电流峰值小于所述预设的压缩机相电流限幅阈值时，提高所述PWM信号的占空比。According to an embodiment of the present invention, when the peak value of the three-phase current of the compressor is greater than the preset compressor phase current limiting threshold, the duty ratio of the PWM signal is decreased; when the compressor is three Increasing the duty cycle of the PWM signal when the phase current peak is less than the preset compressor phase current limit threshold.
根据本发明的一个实施例，通过电流传感器对所述压缩机的相电流进行检测以获取所述压缩机的三相电流，或者，通过至少一个电流采样电阻对所述压缩机的相电流进行检测以获取所述压缩机的三相电流。According to an embodiment of the invention, the phase current of the compressor is detected by a current sensor to obtain a three-phase current of the compressor, or the phase current of the compressor is detected by at least one current sampling resistor To obtain the three-phase current of the compressor.
根据本发明的一个实施例，所述压缩机中的电机为永磁同步电机或永磁无刷直流电机。According to an embodiment of the invention, the motor in the compressor is a permanent magnet synchronous motor or a permanent magnet brushless DC motor.
根据本发明的一个实施例，当所述三相桥臂中每相桥臂的上桥功率开关管均关断且所述三相桥臂中每相桥臂的下桥功率开关管同时导通时，所述压缩机的三相绕组短接；或者当所述三相桥臂中每相桥臂的下桥功率开关管均关断且所述三相桥臂中每相桥臂的上桥功率开关管同时导通时，所述压缩机的三相绕组短接。According to an embodiment of the present invention, when the upper bridge power switch tubes of each of the three-phase bridge arms are turned off, and the lower bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on When the three-phase windings of the compressor are short-circuited; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper bridge of each of the three-phase bridge arms When the power switch tube is simultaneously turned on, the three-phase winding of the compressor is short-circuited.
为实现上述目的，本发明另一方面实施例提出了一种空调器中压缩机的停机控制装置，包括：驱动电路，所述驱动电路包括六个功率开关管，所述六个功率开关管构成三相桥臂，所述三相桥臂中的第一桥臂具有第一节点，所述三相桥臂中的第二桥臂具有第二节点，所述三相桥臂中的第三桥臂具有第三节点，所述第一节点、所述第二节点和所述第三节点对应与所述压缩机的三相绕组相连，且所述六个功率开关管中的每个功率开关管反并联有二极管；控制模块，所述控制模块用于在接收到压缩机停止信号时通过控制所述三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制所述三相桥臂中每相桥臂的下桥功率开关管同时导通或同时关断，或者通过控制所述三相桥臂中每相桥臂的下桥功率开关管均关断、并采用所述PWM信号控制所述三相桥臂中每相桥臂的上桥功率开关管同时导通 或同时关断，以控制所述压缩机的三相绕组短接，并用于获取所述压缩机的三相电流，以及根据所述压缩机的三相电流获取所述压缩机的三相电流峰值，其中，所述控制模块还根据所述压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节所述PWM信号的占空比以调节所述压缩机的三相绕组短接时的制动电流，并根据所述制动电流生成制动转矩以控制所述压缩机的转子制动，以使所述压缩机停止运行。In order to achieve the above object, another embodiment of the present invention provides a shutdown control device for a compressor in an air conditioner, comprising: a drive circuit, the drive circuit includes six power switch tubes, and the six power switch tubes constitute a three-phase bridge arm, a first one of the three-phase bridge arms having a first node, a second one of the three-phase bridge arms having a second node, and a third of the three-phase bridge arms The arm has a third node, the first node, the second node and the third node are correspondingly connected to a three-phase winding of the compressor, and each of the six power switching tubes The anti-parallel has a diode; a control module, wherein the control module is configured to control the upper bridge power switch of each of the three-phase bridge arms to be turned off when receiving the compressor stop signal, and adopt PWM signal control The lower bridge power switch tubes of each of the three-phase bridge arms are turned on or off at the same time, or the power switches of the lower bridges of each of the three-phase bridge arms are turned off, and Controlling the three-phase bridge arm by using the PWM signal Bridge power switch phase arm are simultaneously turned on Or simultaneously shutting down to control the three-phase winding short circuit of the compressor, and for obtaining the three-phase current of the compressor, and acquiring the three-phase current peak of the compressor according to the three-phase current of the compressor The control module further adjusts a duty ratio of the PWM signal according to a peak value of a three-phase current of the compressor and a preset compressor phase current limiting threshold to adjust a short circuit of the three-phase winding of the compressor a braking current at a time, and generating a braking torque according to the braking current to control rotor braking of the compressor to stop the compressor.
根据本发明实施例的空调器中压缩机的停机控制装置，当接收到压缩机停止信号时，控制模块通过控制三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制每相桥臂的下桥功率开关管同时导通或关断，或者通过控制三相桥臂中每相桥臂的下桥功率开关管均关断、并采用PWM信号控制每相桥臂的上桥功率开关管同时导通或关断，以控制压缩机的三相绕组短接，并根据压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节PWM信号的占空比，以调节压缩机的三相绕组短接时的制动电流，以及根据制动电流生成制动转矩以控制压缩机的转子制动，以使压缩机停止运行，从而实现压缩机的快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。According to the shutdown control device for the compressor in the air conditioner according to the embodiment of the present invention, when receiving the compressor stop signal, the control module controls the upper bridge power switch of each of the three-phase bridge arms to be turned off, and adopts The PWM signal controls the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is used to control each phase bridge. The upper bridge power switch tube of the arm is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor, and adjust the PWM signal according to the peak value of the three-phase current of the compressor and the preset compressor phase current limit threshold. Air ratio to adjust the braking current when the three-phase winding of the compressor is short-circuited, and generate braking torque according to the braking current to control the rotor braking of the compressor to stop the compressor, thereby realizing the compressor Quick braking and stationary help reduce the stress in the air conditioner and improve the service life of the piping in the air conditioner.
根据本发明的一个实施例，当所述压缩机的三相电流峰值大于所述预设的压缩机相电流限幅阈值时，所述控制模块降低所述PWM信号的占空比；当所述压缩机的三相电流峰值小于所述预设的压缩机相电流限幅阈值时，所述控制模块提高所述PWM信号的占空比。According to an embodiment of the present invention, when the three-phase current peak of the compressor is greater than the preset compressor phase current limiting threshold, the control module decreases a duty ratio of the PWM signal; The control module increases the duty cycle of the PWM signal when the three-phase current peak of the compressor is less than the preset compressor phase current limit threshold.
根据本发明的一个实施例，所述控制模块通过电流传感器对所述压缩机的相电流进行检测以获取所述压缩机的三相电流，或者，通过至少一个电流采样电阻对所述压缩机的相电流进行检测以获取所述压缩机的三相电流。According to an embodiment of the invention, the control module detects a phase current of the compressor by a current sensor to obtain a three-phase current of the compressor, or a compressor of the compressor through at least one current sampling resistor The phase current is detected to obtain a three-phase current of the compressor.
根据本发明的一个实施例，当所述三相桥臂中每相桥臂的上桥功率开关管均关断且所述三相桥臂中每相桥臂的下桥功率开关管同时导通时，所述压缩机的三相绕组短接；或者当所述三相桥臂中每相桥臂的下桥功率开关管均关断且所述三相桥臂中每相桥臂的上桥功率开关管同时导通时，所述压缩机的三相绕组短接。According to an embodiment of the present invention, when the upper bridge power switch tubes of each of the three-phase bridge arms are turned off, and the lower bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on When the three-phase windings of the compressor are short-circuited; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper bridge of each of the three-phase bridge arms When the power switch tube is simultaneously turned on, the three-phase winding of the compressor is short-circuited.
根据本发明的一个实施例，所述压缩机中的电机为永磁同步电机或永磁无刷直流电机。According to an embodiment of the invention, the motor in the compressor is a permanent magnet synchronous motor or a permanent magnet brushless DC motor.
此外，本发明的实施例还提出了一种空调器，其包括上述的空调器中压缩机的停机控制装置。Further, an embodiment of the present invention also proposes an air conditioner including the above-described shutdown control device for a compressor in an air conditioner.
本发明实施例的空调器，通过上述的空调器中压缩机的停机控制装置，在空调器的停机过程中，当接收到压缩机停止信号时，通过控制压缩机的驱动电路以使压缩机的三相绕组短接来产生制动转矩，加快压缩机的转子制动，从而实现压缩机的快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。The air conditioner according to the embodiment of the present invention, through the above-described shutdown control device of the compressor in the air conditioner, when the compressor stop signal is received during the shutdown of the air conditioner, by controlling the drive circuit of the compressor to make the compressor The three-phase winding is short-circuited to generate braking torque, which accelerates the rotor braking of the compressor, thereby achieving rapid braking and stationary of the compressor, helping to reduce the stress of the piping in the air conditioner and improving the service life of the piping in the air conditioner. .
附图说明 DRAWINGS
图1是根据本发明实施例的空调器中压缩机的停机控制方法的流程图。1 is a flow chart of a method of controlling a shutdown of a compressor in an air conditioner according to an embodiment of the present invention.
图2是根据本发明一个实施例的空调器中压缩机的控制电路拓扑图。2 is a control circuit topology diagram of a compressor in an air conditioner according to an embodiment of the present invention.
图3是根据本发明另一个实施例的空调器中压缩机的控制电路拓扑图。3 is a control circuit topology diagram of a compressor in an air conditioner according to another embodiment of the present invention.
图4是根据本发明又一个实施例的空调器中压缩机的控制电路拓扑图。4 is a control circuit topology diagram of a compressor in an air conditioner according to still another embodiment of the present invention.
图5是根据本发明再一个实施例的空调器中压缩机的控制电路拓扑图。Figure 5 is a control circuit topology diagram of a compressor in an air conditioner according to still another embodiment of the present invention.
图6是根据本发明一个实施例的压缩机驱动信号的波形图。Figure 6 is a waveform diagram of a compressor drive signal in accordance with one embodiment of the present invention.
图7是根据本发明一个实施例的压缩机制动的响应电流波形图。Figure 7 is a waveform diagram of response currents of compressor braking in accordance with one embodiment of the present invention.
具体实施方式detailed description
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.
下面参考附图来描述根据本发明实施例提出的空调器中压缩机的停机控制方法、空调器中压缩机的停机控制装置和空调器。Hereinafter, a shutdown control method of a compressor in an air conditioner, a shutdown control device for a compressor in an air conditioner, and an air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings.
图1是根据本发明实施例的空调器中压缩机的停机控制方法的流程图。1 is a flow chart of a method of controlling a shutdown of a compressor in an air conditioner according to an embodiment of the present invention.
在本发明的实施例中，如图2-5所示，压缩机的驱动电路包括六个功率开关管，六个功率开关管构成三相桥臂，三相桥臂中的第一桥臂具有第一节点，三相桥臂中的第二桥臂具有第二节点，三相桥臂中的第三桥臂具有第三节点，第一节点、第二节点和第三节点对应与压缩机的三相绕组相连，且六个功率开关管中的每个功率开关管反并联有二极管。在压缩机运行过程中，控制模块输出压缩机驱动信号至压缩机的驱动电路，以控制驱动电路中的六个功率开关管的导通和关断，从而控制压缩机的运行。In the embodiment of the present invention, as shown in FIG. 2-5, the driving circuit of the compressor includes six power switching tubes, and the six power switching tubes constitute a three-phase bridge arm, and the first one of the three-phase bridge arms has a first node, a second one of the three-phase bridge arms has a second node, and a third one of the three-phase bridge arms has a third node, the first node, the second node, and the third node corresponding to the compressor Three-phase windings are connected, and each of the six power switching tubes has a diode in anti-parallel. During operation of the compressor, the control module outputs a compressor drive signal to the drive circuit of the compressor to control the turning on and off of the six power switch tubes in the drive circuit to control the operation of the compressor.
其中，六个功率开关管可以为IGBT(Insulated Gate Bipolar Transistor，绝缘栅双极型晶体管)或者MOSFET(Metal Oxide Semiconductor Field Effect Transistor，金属-氧化物半导体场效应晶体管)，并且每个功率开关管还反并联有二极管。可以理解的是，在本发明的实施例中，压缩机的驱动电路也可以直接采用IPM(Intelligent Power Module，智能功率模块)。The six power switch tubes may be an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), and each power switch tube is further Anti-parallel has a diode. It can be understood that, in the embodiment of the present invention, the driving circuit of the compressor can also directly adopt an IPM (Intelligent Power Module).
如图1所示，该空调器中压缩机的停机控制方法包括以下步骤：As shown in FIG. 1, the shutdown control method of the compressor in the air conditioner includes the following steps:
S1，在空调器的停机过程中，当接收到压缩机停止信号时，通过控制三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制三相桥臂中每相桥臂的下桥功率开关管同时导通或同时关断，或者通过控制三相桥臂中每相桥臂的下桥功率开关管均关断、并采用PWM信号控制三相桥臂中每相桥臂的上桥功率开关管同时导通或同时关断，以控制压缩机的三相绕组短接。 S1, in the process of stopping the air conditioner, when receiving the compressor stop signal, the upper bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is used to control the three-phase bridge arm The lower bridge power switch tube of each phase bridge arm is turned on or off at the same time, or the power switch tube of each bridge arm of each phase of the three-phase bridge arm is turned off, and the PWM signal is used to control the three-phase bridge arm. The upper bridge power switch tube of each phase bridge arm is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor.
具体而言，如图6所示，在压缩机接收到停止信号之前，控制模块输出自动闭环调节的SVPWM(Space Vector Pulse Width Modulation，空间矢量脉冲宽度调制)信号(图中忽略了死区时间)以控制压缩机的驱动电路中的六个功率开关管的导通和关断，以使压缩机正常运行。当接收到压缩机停止信号时，控制模块控制三相桥臂中每相桥臂的上桥功率开关管均关断，并采用相同的PWM信号控制三相桥臂中每相桥臂的下桥功率开关管同时导通或关断以控制压缩机的三相绕组短接，即U+/V+/W+三路驱动信号置为低电平，U-/V-/W-三路驱动信号置为相同的PWM信号，其中，在三个下桥功率开关管同时开通过程中，压缩机的三相绕组通过三个下桥功率开关管及其反并联二极管形成短接。或者，在接收到压缩机停止信号时，控制三相桥臂中每相桥臂的下桥功率开关管均关断，并采用相同的PWM信号控制三相桥臂中每相桥臂的上桥功率开关管同时导通或关断以控制压缩机的三相绕组短接，即U-/V-/W-三路驱动信号置为低电平，U+/V+/W+三路驱动信号置为相同的PWM信号，其中，在三个上桥功率开关管同时开通过程中，压缩机的三相绕组通过三个上桥功率开关管及其反并联二极管形成短接。Specifically, as shown in FIG. 6, before the compressor receives the stop signal, the control module outputs an SVPWM (Space Vector Pulse Width Modulation) signal with automatic closed loop adjustment (the dead time is ignored in the figure) To control the turning on and off of the six power switching tubes in the driving circuit of the compressor to make the compressor operate normally. When receiving the compressor stop signal, the control module controls the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm to be turned off, and uses the same PWM signal to control the lower bridge of each phase bridge arm of the three-phase bridge arm The power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U+/V+/W+ three-way drive signal is set to a low level, and the U-/V-/W- three-way drive signal is set to The same PWM signal, in which the three-phase winding of the compressor is short-circuited through three lower-bridge power switching tubes and their anti-parallel diodes during the simultaneous opening of the three lower-bridge power switching tubes. Or, when receiving the compressor stop signal, the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned off, and the same PWM signal is used to control the upper bridge of each phase bridge arm of the three-phase bridge arm The power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U-/V-/W- three-way drive signal is set to a low level, and the U+/V+/W+ three-way drive signal is set to The same PWM signal, in which the three-phase winding of the compressor is short-circuited by three upper-bridge power switching tubes and their anti-parallel diodes during the simultaneous opening of the three upper-bridge power switching tubes.
S2，获取压缩机的三相电流，并根据压缩机的三相电流获取压缩机的三相电流峰值。S2, obtaining the three-phase current of the compressor, and obtaining the three-phase current peak of the compressor according to the three-phase current of the compressor.
在本发明的实施例中，可以通过电流传感器对压缩机的相电流进行检测以获取压缩机的三相电流，或者，通过至少一个电流采样电阻对压缩机的相电流进行检测以获取压缩机的三相电流。In an embodiment of the present invention, the phase current of the compressor may be detected by a current sensor to obtain a three-phase current of the compressor, or the phase current of the compressor may be detected by at least one current sampling resistor to obtain a compressor. Three-phase current.
具体而言，如图3所示，可以通过连接在压缩机三相绕组(或者两相绕组)上的电流传感器对压缩机的相电流进行检测，以获取压缩机的三相电流，并根据压缩机的三相电流计算压缩机的三相电流峰值。或者，如图4所示，通过三个电流采样电阻(或者两个电流采样电阻)对压缩机的相电流进行检测，以获取压缩机的三相电流，并根据压缩机的三相电流计算压缩机的三相电流峰值。或者，如图5所示，通过单个电流采样电阻对压缩机的相电流进行检测，以获取压缩机的三相电流，并根据压缩机的三相电流计算压缩机的三相电流峰值。Specifically, as shown in FIG. 3, the phase current of the compressor can be detected by a current sensor connected to the three-phase winding (or two-phase winding) of the compressor to obtain the three-phase current of the compressor, and according to the compression The three-phase current of the machine calculates the three-phase current peak of the compressor. Or, as shown in FIG. 4, the phase current of the compressor is detected by three current sampling resistors (or two current sampling resistors) to obtain the three-phase current of the compressor, and the compression is calculated according to the three-phase current of the compressor. The three-phase current peak of the machine. Alternatively, as shown in FIG. 5, the phase current of the compressor is detected by a single current sampling resistor to obtain a three-phase current of the compressor, and the three-phase current peak of the compressor is calculated according to the three-phase current of the compressor.
S3，根据压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节PWM信号的占空比，以调节压缩机的三相绕组短接时的制动电流。S3, adjusting the duty ratio of the PWM signal according to the peak value of the three-phase current of the compressor and the preset compressor phase current limiting threshold to adjust the braking current when the three-phase winding of the compressor is short-circuited.
根据本发明的一个实施例，当压缩机的三相电流峰值大于预设的压缩机相电流限幅阈值时，降低PWM信号的占空比；当压缩机的三相电流峰值小于预设的压缩机相电流限幅阈值时，提高PWM信号的占空比。According to an embodiment of the invention, when the peak value of the three-phase current of the compressor is greater than a preset compressor phase current limiting threshold, the duty cycle of the PWM signal is decreased; when the peak value of the three-phase current of the compressor is less than a preset compression When the phase current limit threshold is reached, the duty cycle of the PWM signal is increased.
也就是说，在本发明的实施例中，以预设的压缩机相电流限幅阈值作为给定值，以压缩机的三相电流峰值作为反馈值，当压缩机的三相电流峰值大于压缩机相电流限幅阈值时，控制PWM信号的占空比减小；当压缩机的三相电流峰值小于压缩机相电流限幅阈值时，控 制PWM信号的占空比增大，实现对PWM信号的闭环调节，使压缩机的三相电流峰值不超过压缩机相电流限幅阈值，从而实现对制动电流的限制。That is, in the embodiment of the present invention, the preset compressor phase current limiting threshold is used as a given value, and the three-phase current peak of the compressor is used as a feedback value, when the three-phase current peak of the compressor is greater than the compression. When the phase current limit threshold is reached, the duty cycle of the control PWM signal is reduced; when the peak value of the three-phase current of the compressor is less than the threshold voltage of the compressor phase current, the control The duty ratio of the PWM signal is increased to achieve closed-loop regulation of the PWM signal, so that the peak value of the three-phase current of the compressor does not exceed the compressor phase current limiting threshold, thereby realizing the limitation of the braking current.
可选的，在本发明的实施例中，可以通过棒棒控制器或者比例-积分控制器对PWM信号的占空比进行调节，其中，棒棒控制器或者比例-积分控制器的给定值为压缩机相电流限幅阈值，棒棒控制器或者比例-积分控制器的反馈值为压缩机的三相电流峰值。当反馈值大于给定值时，输出低占空比的PWM信号；当反馈值小于给定值时，输出高占空比的PWM信号。其中，比例-积分控制器的参数可以与压缩机的电流环参数保持一致。Optionally, in the embodiment of the present invention, the duty ratio of the PWM signal may be adjusted by a rod controller or a proportional-integral controller, wherein the rod controller or the proportional-integral controller is given a value For the compressor phase current limiting threshold, the feedback value of the rod controller or the proportional-integral controller is the three-phase current peak of the compressor. When the feedback value is greater than the given value, the low duty cycle PWM signal is output; when the feedback value is less than the given value, the high duty cycle PWM signal is output. Among them, the parameters of the proportional-integral controller can be consistent with the current loop parameters of the compressor.
S4，根据制动电流生成制动转矩以控制压缩机的转子制动，以使压缩机停止运行。S4. Generate braking torque according to the braking current to control the rotor braking of the compressor to stop the compressor.
具体地，在本发明的实施例中，压缩机中的电机可以为永磁同步电机或者永磁无刷直流电机。由于永磁同步电机或者永磁无刷直流电机中的永磁体的作用，当三相绕组短接时，压缩机的转子转动产生反电势，反电势在转子电阻和电感的作用下产生相电流(制动电流)，相电流产生一个反向制动转矩以控制压缩机的转子制动。因此，在压缩机的转子运行到一定的初始速度时，可以通过短接三相绕组来产生制动转矩，加快压缩机转子的制动，从而实现压缩机的快速制动和静止。Specifically, in an embodiment of the invention, the motor in the compressor may be a permanent magnet synchronous motor or a permanent magnet brushless DC motor. Due to the action of the permanent magnets in the permanent magnet synchronous motor or the permanent magnet brushless DC motor, when the three-phase winding is short-circuited, the rotor of the compressor rotates to generate a back electromotive force, and the back-EM potential generates a phase current under the action of the rotor resistance and the inductance ( Brake current), the phase current produces a reverse braking torque to control the rotor braking of the compressor. Therefore, when the rotor of the compressor is operated to a certain initial speed, the braking torque can be generated by short-circuiting the three-phase windings, and the braking of the compressor rotor is accelerated, thereby achieving rapid braking and stationary of the compressor.
也就是说，在本发明的实施例中，当接收到压缩机的停止信号后，不是直接关闭压缩机的驱动信号，以使压缩机的电流为零，并在管路冷媒压力等作用下自由停机，而是通过短接压缩机的三相绕组以产生制动电流，加速压缩机的制动，从而快速达到完全静止状态，有效减小了压缩机电流停止后配管的振动和应力，从而提高了空调器中配管的使用寿命。That is to say, in the embodiment of the present invention, after receiving the stop signal of the compressor, the drive signal of the compressor is not directly turned off, so that the current of the compressor is zero, and is free under the action of the pipeline refrigerant pressure and the like. Stopping, but by shorting the three-phase winding of the compressor to generate braking current, accelerate the braking of the compressor, thereby quickly reaching a completely static state, effectively reducing the vibration and stress of the piping after the compressor current is stopped, thereby improving The service life of the piping in the air conditioner.
根据本发明的具体示例，在三匹变频空调器中，当压缩机中的电机为单转子永磁同步电机时，在空调器停机过程中，当压缩机的运行频率降低至28Hz时，触发压缩机停止信号，控制模块输出相应的驱动信号至压缩机的驱动电路。图7为采用棒棒控制器进行压缩机制动的响应电流波形(高占空比为95％，低占空比为70％)，其中，预设的压缩机相电流限幅阈值为10A。从图7可以看出，在压缩机接收到停止信号之后，PWM信号的占空比被自动调整，使得压缩机的实际三相电流峰值约为12A，基本达到限制压缩机制动电流的目的。According to a specific example of the present invention, in the three-inverter air conditioner, when the motor in the compressor is a single-rotor permanent magnet synchronous motor, when the operating frequency of the compressor is lowered to 28 Hz during the shutdown of the air conditioner, the compression is triggered. The machine stops the signal, and the control module outputs a corresponding driving signal to the driving circuit of the compressor. Figure 7 shows the response current waveform (95% high duty cycle and 70% low duty cycle) for compressor braking using a rod controller, where the preset compressor phase current limiting threshold is 10A. It can be seen from Fig. 7 that after the compressor receives the stop signal, the duty ratio of the PWM signal is automatically adjusted, so that the actual three-phase current peak of the compressor is about 12A, which basically achieves the purpose of limiting the compressor braking current.
根据本发明的一个实施例，当三相桥臂中每相桥臂的上桥功率开关管均关断且三相桥臂中每相桥臂的下桥功率开关管同时导通时，压缩机的三相绕组短接；或者当三相桥臂中每相桥臂的下桥功率开关管均关断且三相桥臂中每相桥臂的上桥功率开关管同时导通时，压缩机的三相绕组短接。According to an embodiment of the present invention, when the upper bridge power switch tubes of each of the three-phase bridge arms are turned off and the lower bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor Short-circuiting of the three-phase windings; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper-bridge power switching tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor The three-phase winding is shorted.
也就是说，当接收到压缩机停止信号时，可以采用恒定占空比为100％的PWM信号控制压缩机的驱动电路，例如，控制三相桥臂中每相桥臂的上桥功率开关管均关断，并控制三相桥臂中每相桥臂的下桥功率开关管均导通，即U+/V+/W+三路驱动信号置为低电平，U-/V-/W-三路驱动信号置为高电平，使得压缩机的三相绕组通过三个下桥功率开关管及其 反并联二极管形成短接。或者，控制三相桥臂中每相桥臂的上桥功率开关管均导通，并控制三相桥臂中每相桥臂的下桥功率开关管均关断，即U+/V+/W+三路驱动信号置为高电平，U-/V-/W-三路驱动信号置为低电平，使得压缩机的三相绕组通过三个上桥功率开关管及其反并联二极管形成短接。That is to say, when receiving the compressor stop signal, the drive circuit of the compressor can be controlled by using a PWM signal with a constant duty ratio of 100%, for example, an upper bridge power switch tube for controlling each of the three-phase bridge arms Both are turned off, and the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned on, that is, the U+/V+/W+ three-way drive signal is set to a low level, U-/V-/W-three The drive signal is set high, so that the three-phase winding of the compressor passes through three lower-bridge power switches and The anti-parallel diodes form a short circuit. Alternatively, the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned on, and the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is controlled to be turned off, that is, U+/V+/W+3 The drive signal is set to a high level, and the U-/V-/W- three-way drive signal is set low, so that the three-phase winding of the compressor is short-circuited by three upper-bridge power switch tubes and their anti-parallel diodes. .
但在采用该方式控制三相绕组短接时，由于压缩机的制动电流由压缩机的初始速度和压缩机的转子电阻决定，因此，当压缩机的初始速度很高、压缩机的转子电阻很小时，会导致压缩机的制定电流比较大，例如压缩机的三相电流峰值约为26A，因而该实施例适用于压缩机降频运行至低频时的停机情况。However, when this method is used to control the short circuit of the three-phase winding, since the braking current of the compressor is determined by the initial speed of the compressor and the rotor resistance of the compressor, when the initial speed of the compressor is high, the rotor resistance of the compressor Very small, it will lead to a relatively large current of the compressor, for example, the peak current of the three-phase current of the compressor is about 26A, so this embodiment is suitable for the shutdown of the compressor down frequency operation to low frequency.
综上所述，根据本发明实施例的空调器中压缩机的停机控制方法，当接收到压缩机停止信号时，通过控制三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制每相桥臂的下桥功率开关管同时导通或关断，或者通过控制三相桥臂中每相桥臂的下桥功率开关管均关断、并采用PWM信号控制每相桥臂的上桥功率开关管同时导通或关断，以控制压缩机的三相绕组短接，并根据压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节PWM信号的占空比，以调节压缩机的三相绕组短接时的制动电流，以及根据制动电流生成制动转矩以控制压缩机的转子制动，以使压缩机停止运行，从而实现压缩机的快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。In summary, the shutdown control method of the compressor in the air conditioner according to the embodiment of the present invention, when receiving the compressor stop signal, is turned off by controlling the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm And use PWM signal to control the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or to control the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm to be turned off, and adopt PWM signal control The upper bridge power switch tube of each phase bridge is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor, and adjust the PWM according to the peak value of the three-phase current of the compressor and the preset compressor phase current limit threshold. The duty cycle of the signal to adjust the braking current when the three-phase winding of the compressor is short-circuited, and generate braking torque according to the braking current to control the rotor braking of the compressor to stop the compressor, thereby realizing The rapid braking and static of the compressor helps to reduce the stress in the air conditioner and improve the service life of the piping in the air conditioner.
图2-图5是根据本发明实施例的空调器中压缩机的控制电路拓扑图。如图2-图5所示，该空调器中压缩机的停机控制装置包括：驱动电路10和控制模块20。2 to 5 are topological views of a control circuit of a compressor in an air conditioner according to an embodiment of the present invention. As shown in FIG. 2 to FIG. 5, the shutdown control device of the compressor in the air conditioner includes a drive circuit 10 and a control module 20.
具体地，驱动电路10包括六个功率开关管，六个功率开关管构成三相桥臂，三相桥臂中的第一桥臂具有第一节点J1，三相桥臂中的第二桥臂具有第二节点J2，三相桥臂中的第三桥臂具有第三节点J3，第一节点J1、第二节点J2和第三节点J3对应与压缩机的三相绕组相连，且六个功率开关管中的每个功率开关管反并联有二极管。其中，六个功率开关管可以为IGBT或者MOSFET，并且每个功率开关管还反并联有二极管。可以理解的是，在本发明的实施例中，压缩机的驱动电路也可以直接采用IPM。Specifically, the driving circuit 10 includes six power switching tubes, and the six power switching tubes form a three-phase bridge arm. The first one of the three-phase bridge arms has a first node J1, and the second one of the three-phase bridge arms Having a second node J2, the third of the three-phase bridge arms has a third node J3, and the first node J1, the second node J2, and the third node J3 are connected to the three-phase winding of the compressor, and six powers Each of the power switch tubes in the switch tube has a diode in anti-parallel. Among them, the six power switch tubes can be IGBTs or MOSFETs, and each power switch tube also has a diode in anti-parallel. It can be understood that in the embodiment of the present invention, the driving circuit of the compressor can also directly adopt the IPM.
控制模块20用于在接收到压缩机停止信号时通过控制三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制三相桥臂中每相桥臂的下桥功率开关管同时导通或同时关断，或者通过控制三相桥臂中每相桥臂的下桥功率开关管均关断、并采用PWM信号控制三相桥臂中每相桥臂的上桥功率开关管同时导通或同时关断，以控制压缩机的三相绕组短接，并用于获取压缩机的三相电流，以及根据压缩机的三相电流获取压缩机的三相电流峰值。The control module 20 is configured to control the upper bridge power switch tube of each phase bridge arm of the three-phase bridge arm to be turned off when receiving the compressor stop signal, and use the PWM signal to control the lower arm of each phase of the three-phase bridge arm The bridge power switch tube is turned on or off at the same time, or the power switch tube of each bridge arm of each phase of the three-phase bridge arm is turned off, and the PWM signal is used to control the upper arm of each phase of the three-phase bridge arm. The bridge power switch tube is simultaneously turned on or off at the same time to control the three-phase winding short circuit of the compressor, and is used for obtaining the three-phase current of the compressor, and obtaining the three-phase current peak of the compressor according to the three-phase current of the compressor.
具体而言，如图6所示，在压缩机接收到停止信号之前，控制模块20输出自动闭环调节的SVPWM信号(图中忽略了死区时间)以控制压缩机的驱动电路10中的六个功率开关管 的导通和关断，以使压缩机正常运行。当接收到压缩机停止信号时，控制模块20控制三相桥臂中每相桥臂的上桥功率开关管均关断，并采用相同的PWM信号控制三相桥臂中每相桥臂的下桥功率开关管同时导通或关断以控制压缩机的三相绕组短接，即U+/V+/W+三路驱动信号置为低电平，U-/V-/W-三路驱动信号置为相同的PWM信号，其中，在三个下桥功率开关管同时开通过程中，压缩机的三相绕组通过三个下桥功率开关管及其反并联二极管形成短接。或者，在接收到压缩机停止信号时，控制模块20控制三相桥臂中每相桥臂的下桥功率开关管均关断，并采用相同的PWM信号控制三相桥臂中每相桥臂的上桥功率开关管同时导通或关断以控制压缩机的三相绕组短接，即U-/V-/W-三路驱动信号置为低电平，U+/V+/W+三路驱动信号置为相同的PWM信号，其中，在三个上桥功率开关管同时开通过程中，压缩机的三相绕组通过三个上桥功率开关管及其反并联二极管形成短接。Specifically, as shown in FIG. 6, before the compressor receives the stop signal, the control module 20 outputs an automatic closed-loop regulated SVPWM signal (the dead time is omitted in the figure) to control six of the drive circuits 10 of the compressor. Power switch tube Turn on and off to allow the compressor to operate normally. When receiving the compressor stop signal, the control module 20 controls the upper bridge power switch tubes of each phase bridge arm of the three-phase bridge arm to be turned off, and uses the same PWM signal to control the lower arm of each phase of the three-phase bridge arms. The bridge power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U+/V+/W+ three-way drive signal is set to a low level, and the U-/V-/W- three-way drive signal is set. For the same PWM signal, in the process of simultaneously opening three lower bridge power switch tubes, the three-phase winding of the compressor is short-circuited by three lower-bridge power switch tubes and their anti-parallel diodes. Alternatively, when receiving the compressor stop signal, the control module 20 controls the lower bridge power switch tubes of each of the three-phase bridge arms to be turned off, and uses the same PWM signal to control each of the three-phase bridge arms. The upper bridge power switch tube is turned on or off at the same time to control the three-phase winding short circuit of the compressor, that is, the U-/V-/W- three-way drive signal is set to a low level, U+/V+/W+ three-way drive The signal is set to the same PWM signal, wherein during the simultaneous opening of the three upper bridge power switches, the three-phase winding of the compressor is short-circuited by three upper bridge power switches and their anti-parallel diodes.
根据本发明的一个实施例，控制模块20通过电流传感器对压缩机的相电流进行检测以获取压缩机的三相电流，或者，通过至少一个电流采样电阻对压缩机的相电流进行检测以获取压缩机的三相电流。According to an embodiment of the invention, the control module 20 detects the phase current of the compressor by a current sensor to obtain a three-phase current of the compressor, or detects the phase current of the compressor by at least one current sampling resistor to obtain compression. Three-phase current of the machine.
具体而言，如图3所示，可以通过连接在压缩机三相绕组(或者两相绕组)上的电流传感器对压缩机的相电流进行检测，以获取压缩机的三相电流，并根据压缩机的三相电流计算压缩机的三相电流峰值。或者，如图4所示，通过三个电流采样电阻(或者两个电流采样电阻)对压缩机的相电流进行检测，以获取压缩机的三相电流，并根据压缩机的三相电流计算压缩机的三相电流峰值。或者，如图5所示，通过单个电流采样电阻对压缩机的相电流进行检测，以获取压缩机的三相电流，并根据压缩机的三相电流计算压缩机的三相电流峰值。Specifically, as shown in FIG. 3, the phase current of the compressor can be detected by a current sensor connected to the three-phase winding (or two-phase winding) of the compressor to obtain the three-phase current of the compressor, and according to the compression The three-phase current of the machine calculates the three-phase current peak of the compressor. Or, as shown in FIG. 4, the phase current of the compressor is detected by three current sampling resistors (or two current sampling resistors) to obtain the three-phase current of the compressor, and the compression is calculated according to the three-phase current of the compressor. The three-phase current peak of the machine. Alternatively, as shown in FIG. 5, the phase current of the compressor is detected by a single current sampling resistor to obtain a three-phase current of the compressor, and the three-phase current peak of the compressor is calculated according to the three-phase current of the compressor.
控制模块20还根据压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节PWM信号的占空比以调节压缩机的三相绕组短接时的制动电流，并根据制动电流生成制动转矩以控制压缩机的转子制动，以使压缩机停止运行。The control module 20 also adjusts the duty ratio of the PWM signal according to the three-phase current peak value of the compressor and the preset compressor phase current limiting threshold to adjust the braking current when the three-phase winding of the compressor is short-circuited, and according to the braking The current generates a braking torque to control the rotor braking of the compressor to stop the compressor.
根据本发明的一个实施例，当压缩机的三相电流峰值大于预设的压缩机相电流限幅阈值时，控制模块20降低PWM信号的占空比；当压缩机的三相电流峰值小于预设的压缩机相电流限幅阈值时，控制模块20提高PWM信号的占空比。According to an embodiment of the invention, when the three-phase current peak of the compressor is greater than a preset compressor phase current limiting threshold, the control module 20 reduces the duty cycle of the PWM signal; when the three-phase current peak of the compressor is less than the pre- When the compressor phase current limiting threshold is set, the control module 20 increases the duty cycle of the PWM signal.
也就是说，在本发明的实施例中，控制模块20以预设的压缩机相电流限幅阈值作为给定值，以压缩机的三相电流峰值作为反馈值，当压缩机的三相电流峰值大于压缩机相电流限幅阈值时，控制模块20控制PWM信号的占空比减小；当压缩机的三相电流峰值小于压缩机相电流限幅阈值时，控制模块20控制PWM信号的占空比增大，实现对PWM信号的闭环调节，使压缩机的三相电流峰值不超过压缩机相电流限幅阈值，从而实现对制动电流的限制。That is, in the embodiment of the present invention, the control module 20 takes the preset compressor phase current limiting threshold as a given value, and uses the three-phase current peak of the compressor as a feedback value, when the three-phase current of the compressor When the peak value is greater than the compressor phase current limiting threshold, the control module 20 controls the duty cycle of the PWM signal to decrease; when the three-phase current peak of the compressor is less than the compressor phase current limiting threshold, the control module 20 controls the PWM signal. The air ratio is increased, and the closed-loop adjustment of the PWM signal is realized, so that the peak value of the three-phase current of the compressor does not exceed the limit value of the compressor phase current limit, thereby realizing the limitation of the braking current.
可选的，在本发明的实施例中，可以通过控制模块20中的棒棒控制器或者比例-积分 控制器对PWM信号的占空比进行调节，其中，棒棒控制器或者比例-积分控制器的给定值为压缩机相电流限幅阈值，棒棒控制器或者比例-积分控制器的反馈值为压缩机的三相电流峰值。当反馈值大于给定值时，输出低占空比的PWM信号；当反馈值小于给定值时，输出高占空比的PWM信号。比例-积分控制器的参数可以与压缩机的电流环参数保持一致。Alternatively, in an embodiment of the invention, the stick controller or proportional-integral in the control module 20 may be The controller adjusts the duty cycle of the PWM signal, wherein the given value of the rod controller or the proportional-integral controller is the compressor phase current limiting threshold, the feedback value of the rod controller or the proportional-integral controller The peak value of the three-phase current of the compressor. When the feedback value is greater than the given value, the low duty cycle PWM signal is output; when the feedback value is less than the given value, the high duty cycle PWM signal is output. The parameters of the proportional-integral controller can be consistent with the current loop parameters of the compressor.
在本发明的实施例中，压缩机中的电机可以为永磁同步电机或者永磁无刷直流电机。由于永磁同步电机或者永磁无刷直流电机中的永磁体的作用，当三相绕组短接时，压缩机的转子转动产生反电势，反电势在转子电阻和电感的作用下产生相电流(制动电流)，相电流产生一个反向制动转矩以控制压缩机的转子制动。因此，在压缩机的转子运行到一定的初始速度时，可以通过短接三相绕组来产生制动转矩，加快压缩机转子的制动，从而实现压缩机的快速制动和静止。In an embodiment of the invention, the motor in the compressor may be a permanent magnet synchronous motor or a permanent magnet brushless DC motor. Due to the action of the permanent magnets in the permanent magnet synchronous motor or the permanent magnet brushless DC motor, when the three-phase winding is short-circuited, the rotor of the compressor rotates to generate a back electromotive force, and the back-EM potential generates a phase current under the action of the rotor resistance and the inductance ( Brake current), the phase current produces a reverse braking torque to control the rotor braking of the compressor. Therefore, when the rotor of the compressor is operated to a certain initial speed, the braking torque can be generated by short-circuiting the three-phase windings, and the braking of the compressor rotor is accelerated, thereby achieving rapid braking and stationary of the compressor.
也就是说，在本发明的实施例中，当接收到压缩机的停止信号后，不是直接关闭压缩机的驱动信号，以使压缩机的电流为零，并在管路冷媒压力等作用下自由停机，而是通过短接压缩机的三相绕组以产生制动电流，加速压缩机的制动，从而快速达到完全静止状态，有效减小了压缩机电流停止后配管的振动和应力，从而提高了空调器中配管的使用寿命。That is to say, in the embodiment of the present invention, after receiving the stop signal of the compressor, the drive signal of the compressor is not directly turned off, so that the current of the compressor is zero, and is free under the action of the pipeline refrigerant pressure and the like. Stopping, but by shorting the three-phase winding of the compressor to generate braking current, accelerate the braking of the compressor, thereby quickly reaching a completely static state, effectively reducing the vibration and stress of the piping after the compressor current is stopped, thereby improving The service life of the piping in the air conditioner.
根据本发明的具体示例，在三匹变频空调器中，当压缩机中的电机为单转子永磁同步电机时，在空调器停机过程中，当压缩机的运行频率降低至28Hz时，触发压缩机停止信号，控制模块20输出相应的驱动信号至压缩机的驱动电路。图7为采用棒棒控制器进行压缩机制动的响应电流波形(高占空比为95％，低占空比为70％)，其中，预设的压缩机相电流限幅阈值为10A。从图7可以看出，在压缩机接收到停止信号之后，PWM信号的占空比被自动调整，使得压缩机的实际三相电流峰值约为12A，基本达到限制压缩机制动电流的目的。According to a specific example of the present invention, in the three-inverter air conditioner, when the motor in the compressor is a single-rotor permanent magnet synchronous motor, when the operating frequency of the compressor is lowered to 28 Hz during the shutdown of the air conditioner, the compression is triggered. The machine stops the signal, and the control module 20 outputs a corresponding driving signal to the driving circuit of the compressor. Figure 7 shows the response current waveform (95% high duty cycle and 70% low duty cycle) for compressor braking using a rod controller, where the preset compressor phase current limiting threshold is 10A. It can be seen from Fig. 7 that after the compressor receives the stop signal, the duty ratio of the PWM signal is automatically adjusted, so that the actual three-phase current peak of the compressor is about 12A, which basically achieves the purpose of limiting the compressor braking current.
根据本发明的一个实施例，当三相桥臂中每相桥臂的上桥功率开关管均关断且三相桥臂中每相桥臂的下桥功率开关管同时导通时，压缩机的三相绕组短接；或者当三相桥臂中每相桥臂的下桥功率开关管均关断且三相桥臂中每相桥臂的上桥功率开关管同时导通时，压缩机的三相绕组短接。According to an embodiment of the present invention, when the upper bridge power switch tubes of each of the three-phase bridge arms are turned off and the lower bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor Short-circuiting of the three-phase windings; or when the lower-bridge power switching tubes of each of the three-phase bridge arms are turned off and the upper-bridge power switching tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor The three-phase winding is shorted.
也就是说，当接收到压缩机停止信号时，控制模块20可以采用恒定占空比为100％的PWM信号控制压缩机的驱动电路，例如，控制模块20控制三相桥臂中每相桥臂的上桥功率开关管均关断，并控制三相桥臂中每相桥臂的下桥功率开关管均导通，即U+/V+/W+三路驱动信号置为低电平，U-/V-/W-三路驱动信号置为高电平，使得压缩机的三相绕组通过三个下桥功率开关管及其反并联二极管形成短接。或者，控制模块20控制三相桥臂中每相桥臂的上桥功率开关管均导通，并控制三相桥臂中每相桥臂的下桥功率开关管均关断，即U+/V+/W+三路驱动信号置为高电平，U-/V-/W-三路驱动信号置为低电平，使得压缩机的三相绕组通过三个上桥功率开关管及其反并联二极管形成短接。 That is, when receiving the compressor stop signal, the control module 20 can control the drive circuit of the compressor with a PWM signal having a constant duty ratio of 100%. For example, the control module 20 controls each of the three-phase bridge arms. The upper bridge power switch tubes are all turned off, and the lower bridge power switch tubes of each phase bridge arm in the three-phase bridge arms are controlled to be turned on, that is, the U+/V+/W+ three-way drive signals are set to a low level, U-/ The V-/W- three-way drive signal is set high, so that the three-phase winding of the compressor is short-circuited by three lower-bridge power switch tubes and their anti-parallel diodes. Alternatively, the control module 20 controls the upper bridge power switch tubes of each of the three-phase bridge arms to be turned on, and controls the lower bridge power switch tubes of each of the three-phase bridge arms to be turned off, that is, U+/V+ The /W+ three-way drive signal is set high, and the U-/V-/W- three-way drive signal is set low, so that the three-phase winding of the compressor passes through three upper-bridge power switch tubes and their anti-parallel diodes. Short-circuited.
但在采用该方式控制三相绕组短接时，由于压缩机的制动电流由压缩机的初始速度和压缩机的转子电阻决定，因此，当压缩机的初始速度很高、压缩机的转子电阻很小时，会导致压缩机的制定电流比较大，例如压缩机的三相电流峰值约为26A，因而该实施例适用于压缩机降频运行至低频时的停机情况。However, when this method is used to control the short circuit of the three-phase winding, since the braking current of the compressor is determined by the initial speed of the compressor and the rotor resistance of the compressor, when the initial speed of the compressor is high, the rotor resistance of the compressor Very small, it will lead to a relatively large current of the compressor, for example, the peak current of the three-phase current of the compressor is about 26A, so this embodiment is suitable for the shutdown of the compressor down frequency operation to low frequency.
根据本发明实施例的空调器中压缩机的停机控制装置，当接收到压缩机停止信号时，控制模块通过控制三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制每相桥臂的下桥功率开关管同时导通或关断，或者通过控制三相桥臂中每相桥臂的下桥功率开关管均关断、并采用PWM信号控制每相桥臂的上桥功率开关管同时导通或关断，以控制压缩机的三相绕组短接，并根据压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节PWM信号的占空比，以调节压缩机的三相绕组短接时的制动电流，以及根据制动电流生成制动转矩以控制压缩机的转子制动，以使压缩机停止运行，从而实现压缩机的快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。According to the shutdown control device for the compressor in the air conditioner according to the embodiment of the present invention, when receiving the compressor stop signal, the control module controls the upper bridge power switch of each of the three-phase bridge arms to be turned off, and adopts The PWM signal controls the lower bridge power switch tube of each phase bridge arm to be turned on or off at the same time, or the lower bridge power switch tube of each phase bridge arm in the three-phase bridge arm is turned off, and the PWM signal is used to control each phase bridge. The upper bridge power switch tube of the arm is turned on or off at the same time to control the short circuit of the three-phase winding of the compressor, and adjust the PWM signal according to the peak value of the three-phase current of the compressor and the preset compressor phase current limit threshold. Air ratio to adjust the braking current when the three-phase winding of the compressor is short-circuited, and generate braking torque according to the braking current to control the rotor braking of the compressor to stop the compressor, thereby realizing the compressor Quick braking and stationary help reduce the stress in the air conditioner and improve the service life of the piping in the air conditioner.
此外，本发明的实施例还提出了一种空调器，其包括上述的空调器中压缩机的停机控制装置。Further, an embodiment of the present invention also proposes an air conditioner including the above-described shutdown control device for a compressor in an air conditioner.
本发明实施例的空调器，通过上述的空调器中压缩机的停机控制装置，在空调器的停机过程中，当接收到压缩机停止信号时，通过控制压缩机的驱动电路以使压缩机的三相绕组短接来产生制动转矩，加速压缩机的转子制动，从而实现压缩机的快速制动并静止，有助于减小空调器中配管应力，提高空调器中配管的使用寿命。The air conditioner according to the embodiment of the present invention, through the above-described shutdown control device of the compressor in the air conditioner, when the compressor stop signal is received during the shutdown of the air conditioner, by controlling the drive circuit of the compressor to make the compressor The three-phase winding is short-circuited to generate braking torque, which accelerates the rotor braking of the compressor, thereby achieving rapid braking and stationary of the compressor, helping to reduce the stress of the piping in the air conditioner and improving the service life of the piping in the air conditioner. .
在本发明的描述中，需要理解的是，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。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；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或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特 征水平高度小于第二特征。In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or below the second feature, or merely represents the first feature. The level of the sign is less than the second feature.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“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发明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必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。 Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (11)

  1. 一种空调器中压缩机的停机控制方法，其特征在于，所述压缩机的驱动电路包括六个功率开关管，所述六个功率开关管构成三相桥臂，所述三相桥臂中的第一桥臂具有第一节点，所述三相桥臂中的第二桥臂具有第二节点，所述三相桥臂中的第三桥臂具有第三节点，所述第一节点、所述第二节点和所述第三节点对应与所述压缩机的三相绕组相连，且所述六个功率开关管中的每个功率开关管反并联有二极管，所述方法包括以下步骤：A shutdown control method for a compressor in an air conditioner, characterized in that the drive circuit of the compressor comprises six power switch tubes, and the six power switch tubes constitute a three-phase bridge arm, wherein the three-phase bridge arm The first bridge arm has a first node, the second one of the three-phase bridge arms has a second node, and the third of the three-phase bridge arms has a third node, the first node, The second node and the third node are connected to the three-phase winding of the compressor, and each of the six power switch tubes has a diode in anti-parallel. The method includes the following steps:
    在空调器的停机过程中，当接收到压缩机停止信号时，通过控制所述三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制所述三相桥臂中每相桥臂的下桥功率开关管同时导通或同时关断，或者通过控制所述三相桥臂中每相桥臂的下桥功率开关管均关断、并采用所述PWM信号控制所述三相桥臂中每相桥臂的上桥功率开关管同时导通或同时关断，以控制所述压缩机的三相绕组短接；During the shutdown of the air conditioner, when the compressor stop signal is received, the upper bridge power switch tube of each of the three-phase bridge arms is controlled to be turned off, and the three-phase bridge is controlled by using a PWM signal. The lower bridge power switch tube of each phase leg of the arm is simultaneously turned on or turned off at the same time, or the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned off, and the PWM signal is adopted Controlling an upper bridge power switch tube of each of the three-phase bridge arms to be simultaneously turned on or off at the same time to control short-circuiting of the three-phase windings of the compressor;
    获取所述压缩机的三相电流，并根据所述压缩机的三相电流获取所述压缩机的三相电流峰值；Obtaining a three-phase current of the compressor, and acquiring a three-phase current peak of the compressor according to a three-phase current of the compressor;
    根据所述压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节所述PWM信号的占空比，以调节所述压缩机的三相绕组短接时的制动电流；Adjusting a duty ratio of the PWM signal according to a peak value of a three-phase current of the compressor and a preset compressor phase current limiting threshold to adjust a braking current when the three-phase winding of the compressor is short-circuited;
    根据所述制动电流生成制动转矩以控制所述压缩机的转子制动，以使所述压缩机停止运行。A braking torque is generated based on the braking current to control rotor braking of the compressor to stop the compressor from operating.
  2. 如权利要求1所述的空调器中压缩机的停机控制方法，其特征在于，其中，A shutdown control method for a compressor in an air conditioner according to claim 1, wherein
    当所述压缩机的三相电流峰值大于所述预设的压缩机相电流限幅阈值时，降低所述PWM信号的占空比；Decreasing a duty cycle of the PWM signal when a peak value of the three-phase current of the compressor is greater than the preset compressor phase current limiting threshold;
    当所述压缩机的三相电流峰值小于所述预设的压缩机相电流限幅阈值时，提高所述PWM信号的占空比。The duty cycle of the PWM signal is increased when a peak of the three-phase current of the compressor is less than the preset compressor phase current limiting threshold.
  3. 如权利要求1或2所述的空调器中压缩机的停机控制方法，其特征在于，通过电流传感器对所述压缩机的相电流进行检测以获取所述压缩机的三相电流，或者，通过至少一个电流采样电阻对所述压缩机的相电流进行检测以获取所述压缩机的三相电流。A shutdown control method for a compressor in an air conditioner according to claim 1 or 2, wherein a phase current of said compressor is detected by a current sensor to obtain a three-phase current of said compressor, or At least one current sampling resistor senses a phase current of the compressor to obtain a three-phase current of the compressor.
  4. 如权利要求1所述的空调器中压缩机的停机控制方法，其特征在于，所述压缩机中的电机为永磁同步电机或永磁无刷直流电机。The shutdown control method for a compressor in an air conditioner according to claim 1, wherein the motor in the compressor is a permanent magnet synchronous motor or a permanent magnet brushless DC motor.
  5. 如权利要求1所述的空调器中压缩机的停机控制方法，其特征在于，其中，A shutdown control method for a compressor in an air conditioner according to claim 1, wherein
    当所述三相桥臂中每相桥臂的上桥功率开关管均关断且所述三相桥臂中每相桥臂的下桥功率开关管同时导通时，所述压缩机的三相绕组短接；或者When the upper bridge power switch tube of each of the three-phase bridge arms is turned off and the lower bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor three The phase winding is shorted; or
    当所述三相桥臂中每相桥臂的下桥功率开关管均关断且所述三相桥臂中每相桥臂的上 桥功率开关管同时导通时，所述压缩机的三相绕组短接。When the lower bridge power switch tubes of each of the three-phase bridge arms are turned off and the upper ones of the three-phase bridge arms are When the bridge power switch tube is simultaneously turned on, the three-phase winding of the compressor is short-circuited.
  6. 一种空调器中压缩机的停机控制装置，其特征在于，包括：A shutdown control device for a compressor in an air conditioner, comprising:
    驱动电路，所述驱动电路包括六个功率开关管，所述六个功率开关管构成三相桥臂，所述三相桥臂中的第一桥臂具有第一节点，所述三相桥臂中的第二桥臂具有第二节点，所述三相桥臂中的第三桥臂具有第三节点，所述第一节点、所述第二节点和所述第三节点对应与所述压缩机的三相绕组相连，且所述六个功率开关管中的每个功率开关管反并联有二极管；a driving circuit comprising six power switching tubes, the six power switching tubes forming a three-phase bridge arm, and a first one of the three-phase bridge arms has a first node, the three-phase bridge arm The second bridge arm has a second node, the third one of the three-phase bridge arms has a third node, and the first node, the second node, and the third node correspond to the compression The three-phase windings of the machine are connected, and each of the six power switch tubes has a diode in anti-parallel;
    控制模块，所述控制模块用于在接收到压缩机停止信号时通过控制所述三相桥臂中每相桥臂的上桥功率开关管均关断、并采用PWM信号控制所述三相桥臂中每相桥臂的下桥功率开关管同时导通或同时关断，或者通过控制所述三相桥臂中每相桥臂的下桥功率开关管均关断、并采用所述PWM信号控制所述三相桥臂中每相桥臂的上桥功率开关管同时导通或同时关断，以控制所述压缩机的三相绕组短接，并用于获取所述压缩机的三相电流，以及根据所述压缩机的三相电流获取所述压缩机的三相电流峰值，其中，所述控制模块还根据所述压缩机的三相电流峰值和预设的压缩机相电流限幅阈值调节所述PWM信号的占空比以调节所述压缩机的三相绕组短接时的制动电流，并根据所述制动电流生成制动转矩以控制所述压缩机的转子制动，以使所述压缩机停止运行。a control module, configured to control an upper bridge power switch tube of each of the three-phase bridge arms to be turned off when receiving a compressor stop signal, and to control the three-phase bridge by using a PWM signal The lower bridge power switch tube of each phase leg of the arm is simultaneously turned on or turned off at the same time, or the lower bridge power switch tube of each phase bridge arm of the three-phase bridge arm is turned off, and the PWM signal is adopted Controlling an upper bridge power switch tube of each of the three-phase bridge arms to be simultaneously turned on or off at the same time to control short-circuiting of the three-phase windings of the compressor, and to obtain three-phase current of the compressor Obtaining a three-phase current peak of the compressor according to a three-phase current of the compressor, wherein the control module is further configured to determine a three-phase current peak of the compressor and a preset compressor phase current limiting threshold Adjusting a duty ratio of the PWM signal to adjust a braking current when the three-phase winding of the compressor is short-circuited, and generating a braking torque according to the braking current to control rotor braking of the compressor, In order to stop the compressor.
  7. 如权利要求6所述的空调器中压缩机的停机控制装置，其特征在于，其中，A shutdown control device for a compressor in an air conditioner according to claim 6, wherein
    当所述压缩机的三相电流峰值大于所述预设的压缩机相电流限幅阈值时，所述控制模块降低所述PWM信号的占空比；The control module reduces a duty cycle of the PWM signal when a peak value of a three-phase current of the compressor is greater than the preset compressor phase current limiting threshold;
    当所述压缩机的三相电流峰值小于所述预设的压缩机相电流限幅阈值时，所述控制模块提高所述PWM信号的占空比。The control module increases the duty cycle of the PWM signal when the three-phase current peak of the compressor is less than the predetermined compressor phase current limit threshold.
  8. 如权利要求6或7所述的空调器中压缩机的停机控制装置，其特征在于，所述控制模块通过电流传感器对所述压缩机的相电流进行检测以获取所述压缩机的三相电流，或者，通过至少一个电流采样电阻对所述压缩机的相电流进行检测以获取所述压缩机的三相电流。The shutdown control device for a compressor in an air conditioner according to claim 6 or 7, wherein said control module detects a phase current of said compressor through a current sensor to obtain a three-phase current of said compressor Alternatively, the phase current of the compressor is detected by at least one current sampling resistor to obtain a three-phase current of the compressor.
  9. 如权利要求6所述的空调器中压缩机的停机控制装置，其特征在于，其中，A shutdown control device for a compressor in an air conditioner according to claim 6, wherein
    当所述三相桥臂中每相桥臂的上桥功率开关管均关断且所述三相桥臂中每相桥臂的下桥功率开关管同时导通时，所述压缩机的三相绕组短接；或者When the upper bridge power switch tube of each of the three-phase bridge arms is turned off and the lower bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor three The phase winding is shorted; or
    当所述三相桥臂中每相桥臂的下桥功率开关管均关断且所述三相桥臂中每相桥臂的上桥功率开关管同时导通时，所述压缩机的三相绕组短接。When the lower bridge power switch tubes of each of the three-phase bridge arms are turned off and the upper bridge power switch tubes of each of the three-phase bridge arms are simultaneously turned on, the compressor three The phase windings are shorted.
  10. 如权利要求6所述的空调器中压缩机的停机控制装置，其特征在于，所述压缩机中的电机为永磁同步电机或永磁无刷直流电机。 The shutdown control device for a compressor in an air conditioner according to claim 6, wherein the motor in the compressor is a permanent magnet synchronous motor or a permanent magnet brushless DC motor.
  11. 一种空调器，其特征在于，包括如权利要求6-10中任一项所述的空调器中压缩机的停机控制装置。 An air conditioner comprising the shutdown control device for a compressor in an air conditioner according to any one of claims 6-10.
PCT/CN2016/092356 2016-03-09 2016-07-29 Air conditioner, and shutdown control method and device for compressor thereof WO2017152573A1 (en)

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