CN105656370A - Air conditioner and shutdown control method and device for compressor of air conditioner - Google Patents
Air conditioner and shutdown control method and device for compressor of air conditioner Download PDFInfo
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- CN105656370A CN105656370A CN201610134284.2A CN201610134284A CN105656370A CN 105656370 A CN105656370 A CN 105656370A CN 201610134284 A CN201610134284 A CN 201610134284A CN 105656370 A CN105656370 A CN 105656370A
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- brachium pontis
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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
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Abstract
The invention discloses an air conditioner and a shutdown control method and device for a compressor of the air conditioner. The method includes the steps that when stop signals of the compressor are received, upper-arm power switch tubes of all bridge arm bodies in a three-phase arm are controlled to be turned off, and lower-arm power switch tubes of all the bridge arm bodies are controlled to be turned on or turned off at the same time through PWM signals or the lower-arm power switch tubes of all the bridge arm bodies are controlled to be turned off, and the upper-arm power switch tubes of all the bridge arm bodies are controlled to be turned on or turned off at the same time through the PWM signals to control a three-phase winding of the compressor to be subjected to a short circuit; the peak value of a three-phase current of the compressor is obtained; the duty ratio of the PWM signals is adjusted according to the peak value of the three-phase current and the limiting threshold value of a phase current of the compressor to adjust a braking current generated when the three-phase winding is subjected to the short circuit; braking torque is generated according to the braking current to control a rotor of the compressor to be braked, and the compressor stops operating accordingly. By means of the method, rapid braking and fixing of the compressor can be achieved, stress of a distributing tube in the air conditioner can be reduced, and the service life of the distributing tube in the air conditioner is prolonged.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly shutdown control method, the Yi Zhongkong of compressor in a kind of air-conditionerAdjust stop control apparatus and a kind of air-conditioner of compressor in device.
Background technology
In transducer air conditioning, due to rotor speed that cannot direct-detection compressor, thereby can only adopt Speedless sensorControl method compressor is controlled. But the method cannot realize closed-loop control in the time of low speed. Therefore, frequency conversion skyThe stopping process of tune device is directly shut down after generally adopting compressor directly to shut down or be downconverted to low-frequency operation, and cannot directly fallFrequently move to zero-speed.
For example, in the stopping process of air-conditioner, when receiving after the stop signal of compressor, control the driving letter of compressorNumber stop output, the vanishing immediately of the electric current of compressor, under the effects such as pipeline refrigerant pressure, compressor is freely shut down. ButDue to the effect of refrigerant pressure, compressor may be shut down by oscillatory extinction, thereby causes pipe arrangement vibration, affects the stress of pipe arrangement.
Summary of the invention
The present invention is intended to solve at least to a certain extent one of technical problem in correlation technique. For this reason, one of the present inventionObject is to propose the shutdown control method of compressor in a kind of air-conditioner, the method by control compressor drive circuit withMake three phase winding short circuits of compressor produce braking moment, accelerate the rotor braking of compressor, thereby make the compressor canFast braking is also static, contributes to reduce piping stress in air-conditioner, improves the service life of pipe arrangement in air-conditioner.
Another object of the present invention is to propose the stop control apparatus of compressor in a kind of air-conditioner. Of the present invention anotherObject is to propose a kind of air-conditioner.
For achieving the above object, one aspect of the present invention embodiment has proposed the shutdown control method of compressor in a kind of air-conditioner,The drive circuit of described compressor comprises six power switch pipes, and described six power switch pipes form three-phase brachium pontis, described threeThe first brachium pontis in phase brachium pontis has first node, and the second brachium pontis in described three-phase brachium pontis has Section Point, described three-phaseThe 3rd brachium pontis in brachium pontis has the 3rd node, described first node, described Section Point and described the 3rd node correspondence and instituteThree phase windings of stating compressor are connected, and each power switch pipe inverse parallel in described six power switch pipes has diode,Said method comprising the steps of: in the stopping process of air-conditioner, in the time receiving compressor stop signal, by controllingIn described three-phase brachium pontis the upper bridge power switch pipe of every phase brachium pontis all turn-off and adopt PWM (PulseWidthModulation,Pulse width modulation) the lower bridge power switch pipe conducting simultaneously of every phase brachium pontis or simultaneously turn-off in three-phase brachium pontis described in signal controlling,Or all turn-off and adopt described pwm signal control by controlling the lower bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontisMake the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis in described three-phase brachium pontis or turn-off simultaneously, to control described compressorThree phase winding short circuits; Obtain the three-phase current of described compressor, and obtain described compression according to the three-phase current of described compressorThe three-phase current peak value of machine; Regulate according to the three-phase current peak value of described compressor and default compressor phase current limiting thresholdThe dutycycle of described pwm signal, the stalling current when regulating three phase winding short circuit of described compressor; According to described brakingElectric current generates braking moment to control the rotor braking of described compressor, so that described compressor is out of service.
According to the shutdown control method of compressor in the air-conditioner of the embodiment of the present invention, in the time receiving compressor stop signal,All turn-off and adopt the every phase brachium pontis of pwm signal control by controlling the upper bridge power switch pipe of every phase brachium pontis in three-phase brachium pontisThe conducting simultaneously of lower bridge power switch pipe or shutoff, or equal by the lower bridge power switch pipe of every phase brachium pontis in control three-phase brachium pontisTurn-off and adopt the conducting simultaneously of upper bridge power switch pipe or the shutoff of the every phase brachium pontis of pwm signal control, to control compressorThree phase winding short circuits, and regulate PWM letter according to the three-phase current peak value of compressor and default compressor phase current limiting thresholdNumber dutycycle, the stalling current when regulating three phase winding short circuit of compressor, and generate braking according to stalling current and turnSquare to be to control the rotor braking of compressor, so that compressor is out of service, thereby realizes the fast braking of compressor static,Contribute to reduce piping stress in air-conditioner, improve the service life of pipe arrangement in air-conditioner.
According to one embodiment of present invention, when the three-phase current peak value of described compressor is greater than described default compressor electricity mutuallyWhen stream limiting threshold, reduce the dutycycle of described pwm signal; When the three-phase current peak value of described compressor is less than described defaultCompressor phase current limiting threshold time, improve the dutycycle of described pwm signal.
According to one embodiment of present invention, by current sensor, the phase current of described compressor is detected to obtain instituteState the three-phase current of compressor, or, by least one current sampling resistor, the phase current of described compressor is detectedTo obtain the three-phase current of described compressor.
According to one embodiment of present invention, the motor in described compressor is permagnetic synchronous motor or permanent-magnet brushless DC electric machine.
According to one embodiment of present invention, when the upper bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-offs and instituteWhile stating the lower bridge power switch pipe conducting simultaneously of every phase brachium pontis in three-phase brachium pontis, three phase winding short circuits of described compressor; OrWhen the lower bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-off and described three-phase brachium pontis in the upper bridge merit of every phase brachium pontisWhen the conducting simultaneously of rate switching tube, three phase winding short circuits of described compressor.
For achieving the above object, the present invention on the other hand embodiment has proposed the stop control apparatus of compressor in a kind of air-conditioner,Comprise: drive circuit, described drive circuit comprises six power switch pipes, described six power switch pipes form three-phase brachium pontis,The first brachium pontis in described three-phase brachium pontis has first node, and the second brachium pontis in described three-phase brachium pontis has Section Point, instituteThe 3rd brachium pontis of stating in three-phase brachium pontis has the 3rd node, described first node, described Section Point and described the 3rd node pairShould be connected with three phase windings of described compressor, and each power switch pipe inverse parallel in described six power switch pipes has twoUtmost point pipe; Control module, described control module for passing through to control described three-phase brachium pontis in the time receiving compressor stop signalThe upper bridge power switch pipe of every phase brachium pontis all turn-offs and adopts described in pwm signal control the lower bridge of every phase brachium pontis in three-phase brachium pontisPower switch pipe conducting simultaneously or simultaneously shutoff, or by controlling the lower bridge power switch of every phase brachium pontis in described three-phase brachium pontisPipe all turn-offs and adopts the upper bridge power switch pipe while conducting of every phase brachium pontis in three-phase brachium pontis described in described pwm signal controlOr turn-off, to control three phase winding short circuits of described compressor, and for obtaining the three-phase current of described compressor, with simultaneouslyAnd obtain the three-phase current peak value of described compressor according to the three-phase current of described compressor, and wherein, also root of described control moduleRegulate the dutycycle of described pwm signal according to the three-phase current peak value of described compressor and default compressor phase current limiting thresholdStalling current when regulating three phase winding short circuit of described compressor, and generate braking moment with control according to described stalling currentMake the rotor braking of described compressor, so that described compressor is out of service.
According to the stop control apparatus of compressor in the air-conditioner of the embodiment of the present invention, in the time receiving compressor stop signal,Control module all turn-offs and adopts pwm signal control every by the upper bridge power switch pipe of controlling every phase brachium pontis in three-phase brachium pontisThe conducting simultaneously of lower bridge power switch pipe or the shutoff of phase brachium pontis, or by controlling the lower bridge power of every phase brachium pontis in three-phase brachium pontisSwitching tube all turn-offs and adopts the conducting simultaneously of upper bridge power switch pipe or the shutoff of the every phase brachium pontis of pwm signal control, to controlThree phase winding short circuits of compressor, and adjust according to the three-phase current peak value of compressor and default compressor phase current limiting thresholdThe dutycycle of joint pwm signal, the stalling current when regulating three phase winding short circuit of compressor, and raw according to stalling currentBecome braking moment to control the rotor braking of compressor, so that compressor is out of service, thereby realize the fast braking of compressorAnd static, contribute to reduce piping stress in air-conditioner, improve the service life of pipe arrangement in air-conditioner.
According to one embodiment of present invention, when the three-phase current peak value of described compressor is greater than described default compressor electricity mutuallyWhen stream limiting threshold, described control module reduces the dutycycle of described pwm signal; When the three-phase current peak value of described compressorWhile being less than described default compressor phase current limiting threshold, described control module improves the dutycycle of described pwm signal.
According to one embodiment of present invention, described control module is carried out the phase current of described compressor by current sensorDetect to obtain the three-phase current of described compressor, or, the phase by least one current sampling resistor to described compressorElectric current detects to obtain the three-phase current of described compressor.
According to one embodiment of present invention, when the upper bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-offs and instituteWhile stating the lower bridge power switch pipe conducting simultaneously of every phase brachium pontis in three-phase brachium pontis, three phase winding short circuits of described compressor; OrWhen the lower bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-off and described three-phase brachium pontis in the upper bridge merit of every phase brachium pontisWhen the conducting simultaneously of rate switching tube, three phase winding short circuits of described compressor.
According to one embodiment of present invention, the motor in described compressor is permagnetic synchronous motor or permanent-magnet brushless DC electric machine.
In addition, embodiments of the invention have also proposed a kind of air-conditioner, and it comprises the shutdown control of compressor in above-mentioned air-conditionerDevice processed.
The air-conditioner of the embodiment of the present invention, by the stop control apparatus of compressor in above-mentioned air-conditioner, stopping of air-conditionerIn machine process, in the time receiving compressor stop signal, by control compressor drive circuit so that the three-phase of compressor aroundGroup short circuit produces braking moment, accelerates the rotor braking of compressor, thereby realizes the fast braking of compressor static, hasHelp reduce piping stress in air-conditioner, improve the service life of pipe arrangement in air-conditioner.
Brief description of the drawings
Fig. 1 is according to the flow chart of the shutdown control method of compressor in the air-conditioner of the embodiment of the present invention.
Fig. 2 is the control circuit topological diagram of compressor in air-conditioner according to an embodiment of the invention.
Fig. 3 is the control circuit topological diagram of compressor in air-conditioner in accordance with another embodiment of the present invention.
Fig. 4 is the control circuit topological diagram of compressor in the air-conditioner of another embodiment according to the present invention.
Fig. 5 is the control circuit topological diagram of compressor in the air-conditioner of another embodiment according to the present invention.
Fig. 6 is the oscillogram of driven compressor signal according to an embodiment of the invention.
Fig. 7 is the response current oscillogram that compressor is braked according to an embodiment of the invention.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein identical from start to finishOr similarly label represents same or similar element or has the element of identical or similar functions. Below by retouching with reference to accompanying drawingThe embodiment stating is exemplary, is intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
Shutdown control method, the air-conditioning of compressor in the air-conditioner proposing according to the embodiment of the present invention are described below with reference to accompanying drawingThe stop control apparatus of compressor and air-conditioner in device.
Fig. 1 is according to the flow chart of the shutdown control method of compressor in the air-conditioner of the embodiment of the present invention.
In an embodiment of the present invention, as shown in Figure 2-5, the drive circuit of compressor comprises six power switch pipes, sixPower switch pipe forms three-phase brachium pontis, and the first brachium pontis in three-phase brachium pontis has first node, the second brachium pontis in three-phase brachium pontisHave Section Point, the 3rd brachium pontis in three-phase brachium pontis has the 3rd node, first node, Section Point and the 3rd node pairShould be connected with three phase windings of compressor, and each power switch pipe inverse parallel in six power switch pipes has diode. ?In compressor operating process, control module output squeezing machine drives the drive circuit of signal to compressor, to control drive circuitIn the turn-on and turn-off of six power switch pipes, thereby control the operation of compressor.
Wherein, six power switch pipes can be that (InsulatedGateBipolarTransistor, insulated gate is two for IGBTBipolar transistor) or MOSFET (MetalOxideSemiconductorFieldEffectTransistor, goldGenus-oxide semiconductor field effect transistor), and each power switch pipe also inverse parallel have diode. Be understandable that,In an embodiment of the present invention, the drive circuit of compressor also can directly adopt IPM (IntelligentPowerModule,SPM).
As shown in Figure 1, in this air-conditioner, the shutdown control method of compressor comprises the following steps:
S1, in the stopping process of air-conditioner, in the time receiving compressor stop signal, by controlling every phase in three-phase brachium pontisThe upper bridge power switch pipe of brachium pontis all turn-offs and adopts the lower bridge power switch of every phase brachium pontis in pwm signal control three-phase brachium pontisSimultaneously conducting of pipe or simultaneously turn-off, or all turn-off by controlling the lower bridge power switch pipe of every phase brachium pontis in three-phase brachium pontis, alsoAdopt the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis in pwm signal control three-phase brachium pontis or turn-off simultaneously, to control pressureThree phase winding short circuits of contracting machine.
Particularly, as shown in Figure 6, before compressor receives stop signal, control module output automated closed-loop regulatesSVPWM (SpaceVectorPulseWidthModulation, space vector pulse width modulation) signal (in figureIgnore Dead Time) to control the turn-on and turn-off of six power switch pipes in the drive circuit of compressor, so that compressionMachine normally moves. In the time receiving compressor stop signal, the upper bridge power of every phase brachium pontis in control module control three-phase brachium pontisSwitching tube all turn-offs, and adopts the lower bridge power switch pipe of every phase brachium pontis in identical pwm signal control three-phase brachium pontis to lead simultaneouslyLead to or turn-off the three phase winding short circuits to control compressor, U+/V+/W+ tri-roads drive signals to be set to low level, U-/V-/W-Three roads drive signal to be set to identical pwm signal, wherein, in three lower bridge power switch pipes while opening processes, compressionThree phase windings of machine form short circuit by three lower bridge power switch pipes and anti-paralleled diode thereof. Or, receiving compressionWhen machine stop signal, the lower bridge power switch pipe of controlling every phase brachium pontis in three-phase brachium pontis all turn-offs, and adopts identical PWM letterNumber control the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis in three-phase brachium pontis or turn-off three phase windings to control compressor shortConnect, U-/V-/W-tri-roads drive signal to be set to low level, and U+/V+/W+ tri-roads drive signal to be set to identical pwm signal,Wherein, on three, in bridge power switch pipe while opening process, three phase windings of compressor are by three upper bridge power switchPipe and anti-paralleled diode thereof form short circuit.
S2, obtains the three-phase current of compressor, and obtains the three-phase current peak value of compressor according to the three-phase current of compressor.
In an embodiment of the present invention, can detect to obtain compressor to the phase current of compressor by current sensorThree-phase current, or, by least one current sampling resistor, the phase current of compressor is detected to obtain compressorThree-phase current.
Particularly, as shown in Figure 3, can be by being connected to the electric current on compressor three phase windings (or two phase windings)Sensor detects the phase current of compressor, to obtain the three-phase current of compressor, and according to the three-phase current of compressorCalculate the three-phase current peak value of compressor. Or, as shown in Figure 4, by three current sampling resistors (or two electric currentsSampling resistor) phase current of compressor is detected, to obtain the three-phase current of compressor, and according to the three-phase of compressorThe three-phase current peak value of Current calculation compressor. Or, as shown in Figure 5, by single current sampling resistor to compressorPhase current detects, to obtain the three-phase current of compressor, and according to the three-phase of the three-phase current calculating compressor of compressorCurrent peak.
S3, regulates the duty of pwm signal according to the three-phase current peak value of compressor and default compressor phase current limiting thresholdRatio, the stalling current when regulating three phase winding short circuit of compressor.
According to one embodiment of present invention, when the three-phase current peak value of compressor is greater than default compressor phase current amplitude limit thresholdWhen value, reduce the dutycycle of pwm signal; When the three-phase current peak value of compressor is less than default compressor phase current amplitude limit thresholdWhen value, improve the dutycycle of pwm signal.
That is to say, in an embodiment of the present invention, using the compressor phase current limiting threshold preset as set-point, to pressThe three-phase current peak value of contracting machine is as value of feedback, in the time that the three-phase current peak value of compressor is greater than compressor phase current limiting threshold,The dutycycle of controlling pwm signal reduces; In the time that the three-phase current peak value of compressor is less than compressor phase current limiting threshold, controlThe dutycycle of pwm signal processed increases, and realizes the closed-loop adjustment to pwm signal, and the three-phase current peak value of compressor is no more thanCompressor phase current limiting threshold, thus realize the restriction to stalling current.
Optionally, in an embodiment of the present invention, can pass through excellent stick controller or proportional-plus-integral controller to pwm signalDutycycle regulate, wherein, the set-point of excellent stick controller or proportional-plus-integral controller is compressor phase current amplitude limitThreshold value, the three-phase current peak value that the value of feedback of excellent stick controller or proportional-plus-integral controller is compressor. When value of feedback is greater thanWhen set-point, the pwm signal of output low duty ratio; In the time that value of feedback is less than set-point, the pwm signal of output high duty ratio.Wherein, the parameter of proportional-plus-integral controller can be consistent with the current ring parameter of compressor.
S4, generates braking moment to control the rotor braking of compressor, so that compressor is out of service according to stalling current.
Particularly, in an embodiment of the present invention, the motor in compressor can be that permagnetic synchronous motor or brushless, permanently are straightStream motor. Due to the effect of the permanent magnet in permagnetic synchronous motor or permanent-magnet brushless DC electric machine, in the time of three phase winding short circuits,The rotor of compressor rotates and produces back-emf, and back-emf produces phase current (stalling current) under the effect of rotor resistance and inductance,Phase current produces a plugging torque to control the rotor braking of compressor. Therefore, at the rotor operation to of compressorWhen fixed initial velocity, can produce braking moment by short circuit three phase windings, accelerate the braking of compressor drum, therebyRealize the fast braking of compressor and static.
That is to say, in an embodiment of the present invention, when receiving after the stop signal of compressor, be not direct closes compressionThe driving signal of machine so that the electric current of compressor is zero, and is freely shut down, but is passed through under the effects such as pipeline refrigerant pressureThree phase windings of short circuit compressor, to produce stalling current, accelerate the braking of compressor, thereby reach fast complete inactive state,Effectively reduce compressor current and stopped vibration and the stress of rear pipe arrangement, thereby improved the service life of pipe arrangement in air-conditioner.
According to concrete example of the present invention, in three transducer air conditionings, when the motor in compressor is single rotor permanent-magnet synchronousWhen motor, in air-conditioner stopping process, in the time that the running frequency of compressor is reduced to 28Hz, trigger compressor stop signal,The corresponding drive circuit of signal to compressor that drive of control module output. Fig. 7 is for adopting excellent stick controller to carry out compression mechanismMoving response current waveform (high duty ratio is 95%, and low duty ratio is 70%), wherein, default compressor phase current amplitude limitThreshold value is 10A. As can be seen from Figure 7, after compressor receives stop signal, the dutycycle of pwm signal is adjusted automaticallyWhole, make the actual three-phase current peak value of compressor be about 12A, substantially reach the object of limit compression mechanism streaming current.
According to one embodiment of present invention, when the upper bridge power switch pipe of every phase brachium pontis in three-phase brachium pontis all turn-offs and three-phase bridgeIn arm when the conducting simultaneously of the lower bridge power switch pipe of every phase brachium pontis, three phase winding short circuits of compressor; Or when in three-phase brachium pontisThe lower bridge power switch pipe of every phase brachium pontis all turn-off and three-phase brachium pontis in when the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis,Three phase winding short circuits of compressor.
That is to say, in the time receiving compressor stop signal, can adopt constant duty ratio is 100% pwm signal controlThe drive circuit of compressor, for example, the upper bridge power switch pipe of controlling every phase brachium pontis in three-phase brachium pontis all turn-offs, and controls threeThe equal conducting of lower bridge power switch pipe of every phase brachium pontis in phase brachium pontis, U+/V+/W+ tri-roads drive signal to be set to low level,U-/V-/W-tri-roads drive signals to be set to high level, three phase windings that make compressor by three lower bridge power switch pipes andAnti-paralleled diode forms short circuit. Or, control the equal conducting of upper bridge power switch pipe of every phase brachium pontis in three-phase brachium pontis, and controlIn three-phase brachium pontis processed, the lower bridge power switch pipe of every phase brachium pontis all turn-offs, and U+/V+/W+ tri-roads drive signal to be set to high level,U-/V-/W-tri-roads drive signals to be set to low level, three phase windings that make compressor by three upper bridge power switch pipes andAnti-paralleled diode forms short circuit.
But in the time adopting which control three phase winding short circuit, due to the stalling current of compressor by the initial velocity of compressor andThe rotor resistance of compressor determines, therefore, in the time that the initial velocity rotor resistance very high, compressor of compressor is very little, meetingCause the formulation current ratio of compressor larger, the three-phase current peak value of for example compressor is about 26A, thereby this embodiment is suitable forShutdown situation in the time that compressor frequency reducing moves to low frequency.
In sum, according to the shutdown control method of compressor in the air-conditioner of the embodiment of the present invention, stop when receiving compressorWhen stop signal, all turn-off and adopt pwm signal control by the upper bridge power switch pipe of controlling every phase brachium pontis in three-phase brachium pontisThe conducting simultaneously of lower bridge power switch pipe or the shutoff of every phase brachium pontis, or by controlling the lower bridge merit of every phase brachium pontis in three-phase brachium pontisRate switching tube all turn-offs and adopts the conducting simultaneously of upper bridge power switch pipe or the shutoff of the every phase brachium pontis of pwm signal control, to controlThree phase winding short circuits of compressor processed, and according to the three-phase current peak value of compressor and default compressor phase current limiting thresholdRegulate the dutycycle of pwm signal, the stalling current when regulating three phase winding short circuit of compressor, and according to stalling currentGenerate braking moment to control the rotor braking of compressor, so that compressor is out of service, thereby realize the quick system of compressorMoving and static, contribute to reduce piping stress in air-conditioner, improve the service life of pipe arrangement in air-conditioner.
Fig. 2-Fig. 5 is according to the control circuit topological diagram of compressor in the air-conditioner of the embodiment of the present invention. As Figure 2-Figure 5,In this air-conditioner, the stop control apparatus of compressor comprises: drive circuit 10 and control module 20.
Particularly, drive circuit 10 comprises six power switch pipes, and six power switch pipes form three-phase brachium pontis, three-phase brachium pontisIn the first brachium pontis there is first node J1, the second brachium pontis in three-phase brachium pontis has Section Point J2, in three-phase brachium pontisThree brachium pontis have the 3rd node J3, the corresponding three-phase with compressor of first node J1, Section Point J2 and the 3rd node J3 aroundGroup is connected, and each power switch pipe inverse parallel in six power switch pipes has diode. Wherein, six power switch pipesCan be IGBT or MOSFET, and each power switch pipe also inverse parallel have diode. Be understandable that, at thisIn inventive embodiment, the drive circuit of compressor also can directly adopt IPM.
Control module 20 for passing through to control the upper bridge power of the every phase brachium pontis of three-phase brachium pontis in the time receiving compressor stop signalSwitching tube all turn-off and adopt the lower bridge power switch pipe conducting simultaneously of every phase brachium pontis in pwm signal control three-phase brachium pontis or withIn time, turn-offs, or all turn-offs and adopt pwm signal control by the lower bridge power switch pipe of controlling every phase brachium pontis in three-phase brachium pontisThe upper bridge power switch pipe conducting simultaneously of every phase brachium pontis or shutoff simultaneously in three-phase brachium pontis processed, to control three phase windings of compressorShort circuit, and for obtaining the three-phase current of compressor, and obtain the three-phase current of compressor according to the three-phase current of compressorPeak value.
Particularly, as shown in Figure 6, before compressor receives stop signal, control module 20 is exported automated closed-loop and is adjustedThe SVPWM signal (having ignored Dead Time in figure) of joint is to control six power switch pipes in the drive circuit 10 of compressorTurn-on and turn-off so that compressor normally moves. In the time receiving compressor stop signal, control module 20 is controlled three-phaseIn brachium pontis, the upper bridge power switch pipe of every phase brachium pontis all turn-offs, and adopts every phase bridge in identical pwm signal control three-phase brachium pontisThe lower bridge power switch pipe conducting simultaneously of arm or shutoff are to control three phase winding short circuits of compressor, and U+/V+/W+ tri-roads driveSignal is set to low level, and U-/V-/W-tri-roads drive signal to be set to identical pwm signal, wherein, open at three lower bridge powerClose in pipe while opening process, three phase windings of compressor form by three lower bridge power switch pipes and anti-paralleled diode thereofShort circuit. Or in the time receiving compressor stop signal, control module 20 is controlled the lower bridge merit of every phase brachium pontis in three-phase brachium pontisRate switching tube all turn-offs, and adopts the upper bridge power switch pipe while of every phase brachium pontis in identical pwm signal control three-phase brachium pontisConducting or shutoff are to control three phase winding short circuits of compressor, and U-/V-/W-tri-roads drive signals to be set to low level, U+/V+/W+Three roads drive signal to be set to identical pwm signal, wherein, on three, in bridge power switch pipe while opening process, compressThree phase windings of machine form short circuit by three upper bridge power switch pipes and anti-paralleled diode thereof.
According to one embodiment of present invention, control module 20 by current sensor to the phase current of compressor detect withObtain the three-phase current of compressor, or, by least one current sampling resistor to the phase current of compressor detect withObtain the three-phase current of compressor.
Particularly, as shown in Figure 3, can be by being connected to the electric current on compressor three phase windings (or two phase windings)Sensor detects the phase current of compressor, to obtain the three-phase current of compressor, and according to the three-phase current of compressorCalculate the three-phase current peak value of compressor. Or, as shown in Figure 4, by three current sampling resistors (or two electric currentsSampling resistor) phase current of compressor is detected, to obtain the three-phase current of compressor, and according to the three-phase of compressorThe three-phase current peak value of Current calculation compressor. Or, as shown in Figure 5, by single current sampling resistor to compressorPhase current detects, to obtain the three-phase current of compressor, and according to the three-phase of the three-phase current calculating compressor of compressorCurrent peak.
Control module 20 also regulates PWM letter according to the three-phase current peak value of compressor and default compressor phase current limiting thresholdNumber the stalling current of dutycycle when regulating three phase winding short circuit of compressor, and according to stalling current generate braking moment withControl the rotor braking of compressor, so that compressor is out of service.
According to one embodiment of present invention, when the three-phase current peak value of compressor is greater than default compressor phase current amplitude limit thresholdWhen value, control module 20 reduces the dutycycle of pwm signal; When the three-phase current peak value of compressor is less than default compressor phaseWhen current limit threshold value, control module 20 improves the dutycycle of pwm signal.
That is to say, in an embodiment of the present invention, control module 20 using the compressor phase current limiting threshold preset as toDefinite value, using the three-phase current peak value of compressor as value of feedback, when the three-phase current peak value of compressor is greater than compressor phase currentWhen limiting threshold, the dutycycle that control module 20 is controlled pwm signal reduces; When the three-phase current peak value of compressor is less than compressionWhen machine phase current limiting threshold, the dutycycle that control module 20 is controlled pwm signal increases, and realizes the closed loop of pwm signal is adjustedJoint, makes the three-phase current peak value of compressor be no more than compressor phase current limiting threshold, thereby realizes the restriction to stalling current.
Optionally, in an embodiment of the present invention, can be by excellent stick controller or ratio-integration in control module 20Controller regulates the dutycycle of pwm signal, and wherein, the set-point of excellent stick controller or proportional-plus-integral controller isCompressor phase current limiting threshold, the three-phase current peak that the value of feedback of excellent stick controller or proportional-plus-integral controller is compressorValue. In the time that value of feedback is greater than set-point, the pwm signal of output low duty ratio; In the time that value of feedback is less than set-point, export highThe pwm signal of dutycycle. The parameter of proportional-plus-integral controller can be consistent with the current ring parameter of compressor.
In an embodiment of the present invention, the motor in compressor can be permagnetic synchronous motor or permanent-magnet brushless DC electric machine.Due to the effect of the permanent magnet in permagnetic synchronous motor or permanent-magnet brushless DC electric machine, in the time of three phase winding short circuits, compressorRotor rotate produce back-emf, back-emf produces phase current (stalling current), phase under the effect of rotor resistance and inductanceElectric current produces a plugging torque to control the rotor braking of compressor. Therefore, arrive certain at the rotor operation of compressorInitial velocity time, can produce braking moment by short circuit three phase windings, accelerate the braking of compressor drum, thereby realThe fast braking of existing compressor and static.
That is to say, in an embodiment of the present invention, when receiving after the stop signal of compressor, be not direct closes compressionThe driving signal of machine so that the electric current of compressor is zero, and is freely shut down, but is passed through under the effects such as pipeline refrigerant pressureThree phase windings of short circuit compressor, to produce stalling current, accelerate the braking of compressor, thereby reach fast complete inactive state,Effectively reduce compressor current and stopped vibration and the stress of rear pipe arrangement, thereby improved the service life of pipe arrangement in air-conditioner.
According to concrete example of the present invention, in three transducer air conditionings, when the motor in compressor is single rotor permanent-magnet synchronousWhen motor, in air-conditioner stopping process, in the time that the running frequency of compressor is reduced to 28Hz, trigger compressor stop signal,The corresponding drive circuit of signal to compressor that drive of control module 20 outputs. Fig. 7 is for adopting excellent stick controller to carry out compressorThe response current waveform (high duty ratio is 95%, and low duty ratio is 70%) of braking, wherein, default compressor phase current limitWidth threshold value is 10A. As can be seen from Figure 7, after compressor receives stop signal, the dutycycle of pwm signal is by automaticAdjust, make the actual three-phase current peak value of compressor be about 12A, substantially reach the object of limit compression mechanism streaming current.
According to one embodiment of present invention, when the upper bridge power switch pipe of every phase brachium pontis in three-phase brachium pontis all turn-offs and three-phase bridgeIn arm when the conducting simultaneously of the lower bridge power switch pipe of every phase brachium pontis, three phase winding short circuits of compressor; Or when in three-phase brachium pontisThe lower bridge power switch pipe of every phase brachium pontis all turn-off and three-phase brachium pontis in when the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis,Three phase winding short circuits of compressor.
That is to say, in the time receiving compressor stop signal, it is 100% that control module 20 can adopt constant duty ratioThe drive circuit of pwm signal control compressor, for example, control module 20 is controlled the upper bridge power of every phase brachium pontis in three-phase brachium pontisSwitching tube all turn-offs, and controls the equal conducting of lower bridge power switch pipe of every phase brachium pontis in three-phase brachium pontis, and drive on U+/V+/W+ tri-tunnelsMoving signal is set to low level, and U-/V-/W-tri-roads drive signal to be set to high level, makes three phase windings of compressor by threeLower bridge power switch pipe and anti-paralleled diode thereof form short circuit. Or control module 20 is controlled every phase brachium pontis in three-phase brachium pontisThe equal conducting of upper bridge power switch pipe, and control the lower bridge power switch pipe of every phase brachium pontis in three-phase brachium pontis and all turn-off,U+/V+/W+ tri-roads drive signal to be set to high level, and U-/V-/W-tri-roads drive signal to be set to low level, make three of compressorPhase winding forms short circuit by three upper bridge power switch pipes and anti-paralleled diode thereof.
But in the time adopting which control three phase winding short circuit, due to the stalling current of compressor by the initial velocity of compressor andThe rotor resistance of compressor determines, therefore, in the time that the initial velocity rotor resistance very high, compressor of compressor is very little, meetingCause the formulation current ratio of compressor larger, the three-phase current peak value of for example compressor is about 26A, thereby this embodiment is suitable forShutdown situation in the time that compressor frequency reducing moves to low frequency.
According to the stop control apparatus of compressor in the air-conditioner of the embodiment of the present invention, in the time receiving compressor stop signal,Control module all turn-offs and adopts pwm signal control every by the upper bridge power switch pipe of controlling every phase brachium pontis in three-phase brachium pontisThe conducting simultaneously of lower bridge power switch pipe or the shutoff of phase brachium pontis, or by controlling the lower bridge power of every phase brachium pontis in three-phase brachium pontisSwitching tube all turn-offs and adopts the conducting simultaneously of upper bridge power switch pipe or the shutoff of the every phase brachium pontis of pwm signal control, to controlThree phase winding short circuits of compressor, and adjust according to the three-phase current peak value of compressor and default compressor phase current limiting thresholdThe dutycycle of joint pwm signal, the stalling current when regulating three phase winding short circuit of compressor, and raw according to stalling currentBecome braking moment to control the rotor braking of compressor, so that compressor is out of service, thereby realize the fast braking of compressorAnd static, contribute to reduce piping stress in air-conditioner, improve the service life of pipe arrangement in air-conditioner.
In addition, embodiments of the invention have also proposed a kind of air-conditioner, and it comprises the shutdown control of compressor in above-mentioned air-conditionerDevice processed.
The air-conditioner of the embodiment of the present invention, by the stop control apparatus of compressor in above-mentioned air-conditioner, stopping of air-conditionerIn machine process, in the time receiving compressor stop signal, by control compressor drive circuit so that the three-phase of compressor aroundGroup short circuit produces braking moment, accelerates the rotor braking of compressor, thereby realizes the fast braking of compressor static, hasHelp reduce piping stress in air-conditioner, improve the service life of pipe arrangement in air-conditioner.
In description of the invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " GuFixed " etc. term should be interpreted broadly, for example, can be to be fixedly connected with, can be also to removably connect, or integral; CanTo be mechanical connection, it can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, canThe connection of two element internals or the interaction relationship of two elements, unless separately there is clear and definite restriction. For this areaThose of ordinary skill, can understand above-mentioned term concrete meaning in the present invention as the case may be.
In the present invention, unless otherwise clearly defined and limited, First Characteristic Second Characteristic " on " or D score canBeing that the first and second features directly contact, or the first and second features are by intermediary mediate contact. And, theOne feature Second Characteristic " on ", " top " and " above " but First Characteristic directly over Second Characteristic orOblique upper, or only represent that First Characteristic level height is higher than Second Characteristic. First Characteristic Second Characteristic " under "," below " and " below " can be First Characteristic under Second Characteristic or tiltedly, or only represents the first spyLevy level height and be less than Second Characteristic.
In the description of this description, reference term " embodiment ", " some embodiment ", " example ", " specifically showExample " or the description of " some examples " etc. the specific features that means to describe in conjunction with this embodiment or example, structure, material orFeature is contained at least one embodiment of the present invention or example. In this manual, the schematic statement to above-mentioned termNot must for be identical embodiment or example. And specific features, structure, material or the feature of description canIn one or more embodiment in office or example with suitable mode combination. In addition, not conflicting in the situation that, abilityThe technical staff in territory can enter the feature of the different embodiment that describe in this description or example and different embodiment or exampleRow combination and combination.
Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary,Can not be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodimentChange, amendment, replacement and modification.
Claims (11)
1. a shutdown control method for compressor in air-conditioner, is characterized in that, the drive circuit of described compressor comprises sixIndividual power switch pipe, described six power switch pipes form three-phase brachium pontis, and the first brachium pontis in described three-phase brachium pontis has firstNode, the second brachium pontis in described three-phase brachium pontis has Section Point, and the 3rd brachium pontis in described three-phase brachium pontis has Section threePoint, described first node, described Section Point and described the 3rd node correspondence are connected with three phase windings of described compressor, andEach power switch pipe inverse parallel in described six power switch pipes has diode, said method comprising the steps of:
In the stopping process of air-conditioner, in the time receiving compressor stop signal, by controlling every phase in described three-phase brachium pontisThe upper bridge power switch pipe of brachium pontis all turn-offs and adopts described in pwm signal control the lower bridge power of every phase brachium pontis in three-phase brachium pontisSwitching tube conducting simultaneously or simultaneously shutoff, or equal by the lower bridge power switch pipe of every phase brachium pontis in the described three-phase brachium pontis of controlTurn-off and adopt described in described pwm signal control in three-phase brachium pontis the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis or withIn time, turn-offs, to control three phase winding short circuits of described compressor;
Obtain the three-phase current of described compressor, and obtain the three-phase electricity of described compressor according to the three-phase current of described compressorStream peak value;
Regulate described pwm signal according to the three-phase current peak value of described compressor and default compressor phase current limiting thresholdDutycycle, the stalling current when regulating three phase winding short circuit of described compressor;
Generate braking moment to control the rotor braking of described compressor, so that described compressor stops according to described stalling currentOperation.
2. the shutdown control method of compressor in air-conditioner as claimed in claim 1, is characterized in that, wherein,
In the time that the three-phase current peak value of described compressor is greater than described default compressor phase current limiting threshold, reduce described PWMThe dutycycle of signal;
In the time that the three-phase current peak value of described compressor is less than described default compressor phase current limiting threshold, improve described PWMThe dutycycle of signal.
3. the shutdown control method of compressor in air-conditioner as claimed in claim 1 or 2, is characterized in that, passes through electric currentSensor detects to obtain the three-phase current of described compressor to the phase current of described compressor, or, by least oneIndividual current sampling resistor detects to obtain the three-phase current of described compressor to the phase current of described compressor.
4. the shutdown control method of compressor in air-conditioner as claimed in claim 1, is characterized in that, in described compressorMotor be permagnetic synchronous motor or permanent-magnet brushless DC electric machine.
5. the shutdown control method of compressor in air-conditioner as claimed in claim 1, is characterized in that, wherein,
When the upper bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-off and described three-phase brachium pontis in every phase brachium pontis underWhen the conducting simultaneously of bridge power switch pipe, three phase winding short circuits of described compressor; Or
When the lower bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-off and described three-phase brachium pontis in every phase brachium pontis upperWhen the conducting simultaneously of bridge power switch pipe, three phase winding short circuits of described compressor.
6. a stop control apparatus for compressor in air-conditioner, is characterized in that, comprising:
Drive circuit, described drive circuit comprises six power switch pipes, described six power switch pipes form three-phase brachium pontis,The first brachium pontis in described three-phase brachium pontis has first node, and the second brachium pontis in described three-phase brachium pontis has Section Point, instituteThe 3rd brachium pontis of stating in three-phase brachium pontis has the 3rd node, described first node, described Section Point and described the 3rd node pairShould be connected with three phase windings of described compressor, and each power switch pipe inverse parallel in described six power switch pipes has twoUtmost point pipe;
Control module, described control module is for every by controlling described three-phase brachium pontis in the time receiving compressor stop signalThe upper bridge power switch pipe of phase brachium pontis all turn-offs and adopts described in pwm signal control the lower bridge merit of every phase brachium pontis in three-phase brachium pontisThe conducting simultaneously of rate switching tube or simultaneously shutoff, or by controlling the lower bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontisAll turn-off and adopt described in described pwm signal control in three-phase brachium pontis the upper bridge power switch pipe conducting simultaneously of every phase brachium pontis orTurn-off simultaneously, to control three phase winding short circuits of described compressor, and for obtaining the three-phase current of described compressor, andObtain the three-phase current peak value of described compressor according to the three-phase current of described compressor, wherein, also basis of described control moduleThe dutycycle that the three-phase current peak value of described compressor and default compressor phase current limiting threshold regulate described pwm signal withStalling current while regulating three phase winding short circuit of described compressor, and generate braking moment to control according to described stalling currentThe rotor braking of described compressor, so that described compressor is out of service.
7. the stop control apparatus of compressor in air-conditioner as claimed in claim 6, is characterized in that, wherein,
In the time that the three-phase current peak value of described compressor is greater than described default compressor phase current limiting threshold, described control mouldPiece reduces the dutycycle of described pwm signal;
In the time that the three-phase current peak value of described compressor is less than described default compressor phase current limiting threshold, described control mouldPiece improves the dutycycle of described pwm signal.
8. the stop control apparatus of compressor in the air-conditioner as described in claim 6 or 7, is characterized in that described controlModule detects to obtain the three-phase current of described compressor to the phase current of described compressor by current sensor, or,By at least one current sampling resistor, the phase current of described compressor is detected to obtain the three-phase electricity of described compressorStream.
9. the stop control apparatus of compressor in air-conditioner as claimed in claim 6, is characterized in that, wherein,
When the upper bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-off and described three-phase brachium pontis in every phase brachium pontis underWhen the conducting simultaneously of bridge power switch pipe, three phase winding short circuits of described compressor; Or
When the lower bridge power switch pipe of every phase brachium pontis in described three-phase brachium pontis all turn-off and described three-phase brachium pontis in every phase brachium pontis upperWhen the conducting simultaneously of bridge power switch pipe, three phase winding short circuits of described compressor.
10. the stop control apparatus of compressor in air-conditioner as claimed in claim 6, is characterized in that described compressorIn motor be permagnetic synchronous motor or permanent-magnet brushless DC electric machine.
11. 1 kinds of air-conditioners, is characterized in that, comprise compressor in the air-conditioner as described in any one in claim 6-10Stop control apparatus.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610134284.2A CN105656370A (en) | 2016-03-09 | 2016-03-09 | Air conditioner and shutdown control method and device for compressor of air conditioner |
| PCT/CN2016/092356 WO2017152573A1 (en) | 2016-03-09 | 2016-07-29 | Air conditioner, and shutdown control method and device for compressor thereof |
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| CN201610134284.2A CN105656370A (en) | 2016-03-09 | 2016-03-09 | Air conditioner and shutdown control method and device for compressor of air conditioner |
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Application publication date: 20160608 |
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