CN1086795C - Inverter for air conditioner and air conditioner thereof - Google Patents

Inverter for air conditioner and air conditioner thereof Download PDF

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Publication number
CN1086795C
CN1086795C CN97111483A CN97111483A CN1086795C CN 1086795 C CN1086795 C CN 1086795C CN 97111483 A CN97111483 A CN 97111483A CN 97111483 A CN97111483 A CN 97111483A CN 1086795 C CN1086795 C CN 1086795C
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China
Prior art keywords
circuit
current
frequency
leakage current
air conditioner
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Expired - Fee Related
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CN97111483A
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CN1167239A (en
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上村俊行
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Toshiba Corp
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Toshiba Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Multiple Motors (AREA)

Abstract

To reduce high-frequency leakage current without fail, even at a high switching frequency, by detecting a zero-phase current flowing from each phase winding of a brushless direct-current motor to earth creating a current having a waveform similar to that of the zero-phase current to forcibly cancel out the leakage current from the brushless direct-current motor. Since high-frequency leakage current flows to a direct current circuit, the currents, are detected using a zero-phase current detector. The output voltage of the zero-phase current detector is class A push-pull-amplified using transistor to create a current for canceling out similar to the zero-phase current in waveform. The current for canceling out has such a polarity as to make the said current flow from earth E to a current canceling-out circuit. Based on the polarity and waveform, the high-frequency leakage current is thereby forcibly canceled out.

Description

The DC-to-AC converter of air conditioner and air conditioner
The present invention relates to handle from the air conditioner DC-to-AC converter of compressor motor to the high-frequency leakage current on ground.
Air conditioner has the DC-to-AC converter that the Driven Compressor motor is used.
DC-to-AC converter has: the rectification circuit of commercial ac power source voltage commutation, with the switching circuit that the voltage transformation that utilizes this rectification circuit rectification is become high frequency voltage by means of switch.The output of this switching circuit as driving power, is supplied with compressor motor.
Compressor motor and compressor section are contained in the compressor case together, for safety, this compressor case ground connection.
Between the winding of compressor motor and its shell (that is, ground), exist electrostatic capacitance, be accompanied by the driving of switch in the DC-to-AC converter, the high-frequency leakage current of number MHz flows to ground from compressor motor by above-mentioned electrostatic capacitance.
This high-frequency leakage current is propagated to commercial ac power source by induction, and the drive controlling of this DC-to-AC converter is produced harmful effect, also worries to cause misoperations such as other family's electrical article and tie breaker.
In order to reduce this high-frequency leakage current, can take between DC-to-AC converter output and compressor motor wiring, to be provided with countermeasures such as choke or reduction DC-to-AC converter switching frequency itself.
But,, when the switching frequency of DC-to-AC converter improves, can not obtain enough effects that reduces even be provided with choke in order to reduce high-frequency leakage current.
If, the switching frequency of reduction DC-to-AC converter, ability, the air-conditioning ability that just can not improve compressor are just not much of that.
Also have, adopting liquid fluorocarbon to replace the in the past used cold-producing medium HCFC22 (CHCIF strong depletion of the ozone layer power 2) situation under, particularly adopt HFC32 (CH 2F 2) and HFC125 (CHF 2CF 3) time, bad because of electric insulating quality, dielectric constant is big, so above-mentioned leakage current is increased.
The present invention has considered above-mentioned situation, its purpose is, in the high occasion of switching frequency and adopting HFC32 and HFC125 to replace like that under the HCFC cold-producing medium occasion, also can reduce high-frequency leakage current reliably, therefore, also can improve compressor capacity, also can access enough air-conditioning abilities.
The DC-to-AC converter of the air conditioner of the 1st invention, this air conditioner has: compressor; Be used to drive the compressor motor of described compressor; Be used for the rectification circuit of commercial ac power source voltage commutation; And be used for the voltage transformation that utilizes this rectification circuit institute rectification being become high frequency voltage by conversion, the switching circuit that described high frequency voltage is exported as the driving power that provides to described compressor motor, be arranged on the Zero-phase current detector on the above-mentioned rectification circuit rear portion, waveform to by means of the similar electric current of the high-frequency leakage current that above-mentioned Zero-phase current detector detected that flows to ground from the above-mentioned compressor motor, as offset leakage current with and the current canceling circuit that forms; The output head grounding of above-mentioned current canceling circuit.
The DC-to-AC converter of the air conditioner of the 2nd invention, this air conditioner has: compressor; Be used to drive the compressor motor of described compressor; Be used for the rectification circuit of commercial ac power source voltage commutation; And be used for the voltage transformation that utilizes this rectification circuit institute rectification being become high frequency voltage by conversion, the switching circuit that this high frequency voltage is exported as the driving power that provides to above-mentioned compressor motor, be arranged on the low-frequency filter on the above-mentioned rectification circuit rear portion, detect the high-frequency leakage current that flows to ground from compressor motor by above-mentioned low-frequency filter, similar in appearance to the electric current of the waveform of the high-frequency leakage current that detects as leakage current offset with and the current canceling circuit that forms; The output head grounding of current canceling circuit.
The DC-to-AC converter of the 3rd invention air conditioner is in the 2nd invention, and at first, low-frequency filter is by being present in the electrostatic capacitance between a pair of circuit and being installed on the magnetic core and the inductance that is plugged into two a pair of coils on the circuit constitutes.And then the current canceling circuit has: be installed on detecting with coil with this on low-frequency filter magnetic core and detect amplifying circuit with the voltage amplification that produces on the coil; Utilization detects with coil detecting to the high-frequency leakage current that ground flows from compressor motor, the waveform electric current similar to the high-frequency leakage current that is detected as the counteracting leakage current with, form by means of amplifying circuit.
The DC-to-AC converter of the 4th invention air conditioner is in the 2nd invention, and at first, low-frequency filter is by being present in the electrostatic capacitance between a pair of circuit and being installed on the magnetic core and the inductance that is plugged into two a pair of coils on the circuit constitutes.And then the current canceling circuit has: be installed on detecting on the low-frequency filter magnetic core and use coil and utilize pair of transistor that this is detected with the voltage that produces on the coil and carry out the amplifying circuit that category-A is recommended amplification; Utilization detects with coil detecting to the high-frequency leakage current that ground flows from compressor motor, the waveform electric current similar to the high-frequency leakage current that is detected as the counteracting leakage current with, form by means of amplifying circuit.
The DC-to-AC converter of the 5th invention air conditioner is in the 2nd invention, and at first, low-frequency filter is by being present in the electrostatic capacitance between a pair of circuit and being installed on the magnetic core and the inductance that is plugged into two a pair of coils on the circuit constitutes.And then the current canceling circuit has: be installed on a pair of on the low-frequency filter magnetic core and detect with coil and by means of the transistor of correspondence this is respectively detected amplifying circuit with the voltage amplification that produces on the coil respectively; Utilize respectively to detect and use coil, detecting to the high-frequency leakage current that ground flows from compressor motor, the waveform electric current similar to the high-frequency leakage current that is detected as the counteracting leakage current with, form by means of amplifying circuit.
The DC-to-AC converter of the 6th invention air conditioner is in arbitrary invention of the 1st～the 5th invention, is provided for the Drive and Control Circuit of drive controlling switching circuit, the amplifying circuit integrated circuit of this Drive and Control Circuit with switching circuit and current canceling circuit.
The 7th invention air conditioner adopts the cold-producing medium of liquid fluorocarbon as air conditioner, by means of the 1st invention DC-to-AC converter Driven Compressor.
Fig. 1 is the block diagram that the formation of the 1st embodiment control circuit is shown;
Fig. 2 illustrates each embodiment medium-high frequency leakage current I 1The figure of waveform;
Fig. 3 illustrates to offset among each embodiment to use electric current I 2The figure of waveform;
Fig. 4 is the negative function that illustrates by each embodiment, streaming current I in ground 3The figure of waveform;
Fig. 5 is the block diagram that the formation of the 2nd embodiment control circuit is shown;
Fig. 6 is the block diagram that the formation of the 3rd embodiment control circuit is shown;
Fig. 7 is the block diagram that the formation of the 4th embodiment control circuit is shown;
Fig. 8 is among each embodiment, the refrigeration cycle diagram of air conditioner.1-commercial ac power source 2-low-frequency filter 5-rectification circuit 7-low-frequency filter 8-magnetic core 9-coil 10-filtering capacitor 11-switching circuit 12-compressor motor 13-winding 14-compressor case 20-control section 23-Drive and Control Circuit 30-current canceling circuit 31-detects the coil 32-NPN transistor npn npn 33-PNP transistor npn npn of usefulness
As shown in Figure 8, as the freeze cycle of air conditioner,,, sequentially couple together by means of refrigerant piping compressor, condenser, decompressor (expansion valve, capillary etc.), evaporator.And, the low HFC32 of electric insulating quality and HFC 125 are about 50%/50% mix refrigerant with weight ratio enclose in the cold-producing medium of this freeze cycle.
Then, the DC-to-AC converter that drives the compressor for air conditioner that constitutes like this is described.
Below, with reference to accompanying drawing, the 1st embodiment of the present invention is described.
As shown in Figure 1, rectification circuit 5 is connected on the commercial ac power source 1 by low-frequency filter (also being called line filter) 2.
Low-frequency filter 2 is made of choke 3,3 and capacitor 4,4, stops high-frequency noise to be propagated to power supply 1.
The rectifier bridge that rectification circuit 5 is connected by the bridge-type of a plurality of diodes 6, be connected to the low-frequency filter 7 on this rectifier bridge rear portion and the filtering capacitor 10 that is connected on the 2nd low-frequency filter 7 rear portions constitutes, the voltage commutation of commercial ac power source 1.
Low-frequency filter 7 is for being wrapped in the coil on the magnetic ferrites magnetic core 8 synchronously with copper cash, if the load beyond is thought of as noise-producing source, the noise current then coil 9a by on one side flows, cancels each other with the magnetic field that noise current produced that the coil 9b by opposite there returns.And, realize by means of such formation: stop high fdrequency component, only pass through low frequency component.
Switching circuit 11 is connected on the output of rectification circuit 5.Switching circuit 11 is made of a plurality of switch elements (for example, power transistor), utilizes the voltage transformation of rectification circuit 5 rectifications to become high frequency voltage, output by means of the switch handle.
Compressor motor 12 is connected on the output of switching circuit 11.The Brushless DC motor of compressor motor 12 for being made of 3 phase windings 13,13,13 is in compressor section is contained in compressor case 14.For safety, compressor case 14 ground connection.
In compressor motor 12, diagram C is for being present in the electrostatic capacitance between each winding 13 and the compressor case (that is ground) 14.
On the other hand, 20 is the control section of air conditioner, the integral body of control air conditioner.Indoor temperature transmitter 21, acceptance division 22 and Drive and Control Circuit 23 are connected on this control section 20.
Indoor temperature transmitter 21 detects by the temperature T a in the air conditioning chamber.Acceptance division 22 receives from distance type operator (below, abbreviate remote controller as) 24 infrared rays that send.Remote controller 24 sends the data that service conditions is set usefulness by means of infrared ray.
Drive and Control Circuit 23 is according to the instruction from control part 20, each power transistor of switching circuit 11 carried out on-off drive, and simultaneously, controls the cycle (that is, switching frequency) that this on-off drives, and control connect during (that is on-off duty ratio, PWM control).
To the DC-to-AC converter of such formation, current canceling circuit 30 is set.
Current canceling circuit 30 has: be arranged on the Zero-phase current detector 31 on the diode 6 rectifier bridge rear portions, 32,33 pairs of output voltages from this Zero-phase current detector 31 of pair of transistor by means of NPN type and positive-negative-positive carry out the amplifying circuit that category-A is recommended amplification, be connected between the collector electrode and emitter of transistor 32,33, prevent the diode 34,34 that inverse electromotive force is used, and remove the capacitor 35 that DC component is used; Utilize Zero-phase current detector 31 the aftermentioned high-frequency leakage current I that flows to ground from compressor motor 14 1Detect, waveform and the high-frequency leakage current I that is detected 1Similar electric current I 2As offset leakage current with and form by means of above-mentioned amplifying circuit, electric current I 2By above-mentioned capacitor 35 outputs.
The output head grounding of current canceling circuit 30.
Moreover, it should be noted, make to detect with the winding direction of coil and the coil homophase of filter 7.If anti-phase winding, phase place have then departed from (common mode) noise current that flows in power supply, make the electrorheological of offsetting usefulness become Flow Injection Chemiluminescence Method.
Below, the effect of above-mentioned formation is described.
Utilize remote controller 24 to set required indoor temperature Ts, and the operation that brings into operation.So switching circuit 11 is subjected to switch drive, by means of output, the Driven Compressor motor 12 of switching circuit 11.
At this moment, obtain the difference Δ T of the indoor temperature Ts that utilizes indoor temperature Ta that indoor temperature transmitter 21 detects and setting, according to the switching frequency of this temperature difference Δ T, control switch circuit 11.
When changing the switching frequency of switching circuit 11, the rotating speed of compressor motor 12 has just changed.This change in rotational speed shows as the variation of compressor capacity.
When temperature difference Δ T becomes zero, just stop switch drive to switching circuit 11, compressor motor 12 stops, and compressor is out of service.
, be accompanied by the switch drive of switching circuit 11, waveform several MHz high-frequency leakage current I as shown in Figure 2 1Flow by the electrostatic capacitance C between each winding 13 and the compressor case (that is ground) 14 in the compressor motor 12.
This high-frequency leakage current I 1Propagate along commercial ac power source by induction, the drive controlling of this DC-to-AC converter is produced harmful effect, also worries to cause misoperations such as other household article and tie breaker.
Here, because high-frequency leakage current I 1Be directly proportional with the Zero-phase current of motor winding, so can detect this high-frequency leakage current I by Zero-phase current detector 31 1
When detecting high-frequency leakage current I 1The time, transistor 32,33 is just to this high-frequency leakage current I that has detected 1Carry out category-A and recommend amplification.As shown in Figure 3, waveform similarity is in high-frequency leakage current I 1The counteracting electric current I 2, form by means of this amplification.
The counteracting electric current I 2Polarity be from ground to offsetting current circuit 30, according to this polarity and waveform, high-frequency leakage current I 1Absorbed by current canceling circuit 30 and be cancelled.By means of this counteracting, the electric current I of Liu Donging in the ground 3As shown in Figure 4, become to the low level waveform.
Like this, detect high-frequency leakage current I 1, form similar in appearance to this high-frequency leakage current I 1The counteracting electric current I of waveform 2, by this counteracting electric current I 2High-frequency leakage current I 1Balance out forcibly, whereby,, also can reduce high-frequency leakage current I reliably even for example under the high occasion of switching frequency of switching circuit 11 1
Thereby, can improve the switching frequency of switching circuit 11 as far as possible, and the drive controlling of this DC-to-AC converter is not produced harmful effect, do not worry causing misoperations such as other family's electrical article and tie breaker yet.And, can sufficiently improve the ability of compressor, can obtain enough air-conditioning abilities.
Secondly, by means of Fig. 5, the 2nd embodiment of the present invention is described.In the 2nd embodiment, the formation of current canceling circuit 30 is different with the 1st embodiment.
That is, in the current canceling circuit 30, the coil 31A that detects usefulness is installed on the magnetic ferrites magnetic core 8 of low-frequency filter 7.Other formation is identical with the 1st embodiment.
Under this occasion, also detect high-frequency leakage current I 1, form similar in appearance to this high-frequency leakage current I 1The counteracting electric current I of waveform 2, by this counteracting electric current I 2High-frequency leakage current I 1Balance out forcibly.
Also have, when detecting Zero-phase current, do not adopt special-purpose Zero-phase current detector, but, therefore, just can realize the low price miniaturization of DC-to-AC converter with easy formation by preventing that on the low-frequency filter that noise is used coil being set detects Zero-phase current.
Secondly, by means of Fig. 6, relevant the 3rd embodiment of the present invention is described.
In the 3rd embodiment, the formation of current canceling circuit 30 and the 2nd embodiment are slightly different.
Promptly, current canceling circuit 30 has: be installed on a pair of the detecting with coil 36A, 36B on the magnetic core 8 of low-frequency filter 7, by means of corresponding respectively a pair of NPN transistor 32,37 this is detected amplifying circuit with the voltage amplification of coil 36A, the last generation of 36B, be connected to preventing the diode 34,34 that inverse electromotive force is used and removing the capacitor 35 that DC component is used between the collector electrode of transistor 32,37 and the emitter; Utilization detects and the high-frequency leakage current I that flows to ground from compressor motor 14 1 Coil 36A, the 36B of the Zero-phase current that is directly proportional size usefulness detect positive current and negative current respectively, with the high-frequency leakage current I that is detected 1The electric current I of similar waveform 2As offsetting leakage current usefulness, form by means of amplifying circuit, electric current I 2By capacitor 35 outputs.
Other formation is identical with the 2nd embodiment.
Under this occasion, also detect high-frequency leakage current I 1, form similar in appearance to this high-frequency leakage current I 1The counteracting electric current I of waveform 2, by this counteracting electric current I 2High-frequency leakage current I 1Balance out forcibly.
As the 2nd embodiment, even do not constitute complementary push-pull (three covers) circuit that uses the few PNP transistor of kind to use as withstand voltage, the high amplification coefficient of height, high frequency, but the transistor by using same characteristic in the abundant NPN transistor of kind, also can control to offset and use electric current, can obtain the effect identical with the 1st embodiment.
Secondly, by means of Fig. 7, the 4th embodiment of the present invention is described.
In the 4th embodiment, replace the switching circuit 11 of the 1st embodiment, integrated circuit 40 is set.
Integrated circuit 40 is the switching circuit portion 41 that is equivalent to switching circuit 11, be equivalent to the Drive and Control Circuit portion 42 of Drive and Control Circuit 23 among the 1st embodiment, and the amplifying circuit portion 43 that is equivalent to the amplifying circuit of current canceling circuit 30 among the 1st embodiment accumulates the element of single chip.
By means of adopting such integrated circuit 40, make that at performance DC-to-AC converter aspect of performance, important hot countermeasure and insulation countermeasure have become easily, can also seek to dwindle the erection space of DC-to-AC converter in air conditioner.
Also have, in current canceling circuit 30, detect on the usefulness output line of coil 31 adjusting to be plugged into resistance 38,38.Adjust the category-A that is used to adjust dependence amplifying circuit portion 43 with resistance 38,38 and recommend amplified current amplification coefficient hfe.
By means of the resistance value of suitably selecting to adjust with resistance 38,38, can for example contrast " error " or contrast high-frequency leakage current I that category-A is recommended amplified current amplification coefficient hfe 1Size, form the counteracting electric current I of optimizing level 2
Also have, by means of DC-to-AC converter shown in above-mentioned the 1st embodiment～the 4th embodiment is used is the drive unit of compressor in the air conditioner, even enclose under the occasion of freeze cycle as cold-producing medium at HFC32 low and the such liquid fluorocarbon of HFC125 electric insulating quality, also can control leakage current, the air conditioner that does not have the depletion of the ozone layer problem and then do not have the high frequency problem can be provided from compressor.
Moreover the present invention is not limited to the various embodiments described above, in the constant scope of main points, can carry out various distortion and implement.
As mentioned above, if the DC-to-AC converter of air conditioner according to the present invention, detect the high-frequency leakage current that flows to ground from compressor motor, form similar in appearance to this detected the waveform of high-frequency leakage current electric current, by this established electric current high-frequency leakage current is balanced out forcibly, therefore, even under the high occasion of switching frequency, also high-frequency leakage current can be reduced reliably, therefore, the ability of compressor can be improved, enough air-conditioning abilities can be obtained.

Claims (7)

1. the DC-to-AC converter of an air conditioner, this air conditioner has: compressor; Be used to drive the compressor motor (12) of described compressor; Be used for rectification circuit (5) the voltage commutation of commercial ac power source (1); And be used for utilizing the voltage transformation of described rectification circuit (5) institute rectification to become high frequency voltage by the conversion handle, the switching circuit (11) described high frequency voltage is exported as the driving power that provides to described compressor motor (12) is characterized in that, has:
Be arranged on the Zero-phase current detector (31) on described rectification circuit (5) rear portion;
Offset the current canceling circuit (30) of using and forming the electric current of the waveform similar, as leakage current to the high-frequency leakage current that is detected by means of the described Zero-phase current detector (31) that flows to ground from described compressor motor (12);
The output head grounding of described current canceling circuit (30).
2. the DC-to-AC converter of an air conditioner, this air conditioner has: compressor; Be used to drive the compressor motor (12) of described compressor; Be used for rectification circuit (5) the voltage commutation of commercial ac power source (1); And be used for utilizing the voltage transformation of described rectification circuit (5) institute rectification to become high frequency voltage by the conversion handle, the switching circuit (11) described high frequency voltage is exported as the driving power that provides to described compressor motor (12) is characterized in that, has:
Be arranged on the low-frequency filter (2) on described rectification circuit (5) rear portion;
Detect the high-frequency leakage current that flows to ground from described compressor motor (12) by described low-frequency filter (2), similar in appearance to the electric current of the waveform of the high-frequency leakage current that detects as leakage current offset with and the current canceling circuit (30) that forms;
The output head grounding of described current canceling circuit (30).
3. according to the DC-to-AC converter of the air conditioner described in the claim 2, it is characterized in that,
Described low-frequency filter is by being present in the electrostatic capacitance between a pair of circuit and being installed on the magnetic core and the inductance that is plugged into two a pair of coils on the circuit constitutes;
Described current canceling circuit has: be installed on detecting with coil and this on described low-frequency filter magnetic core and detect amplifying circuit with the voltage amplification that produces on the coil; Utilize described detecting to detect to the high-frequency leakage current that ground flows, the electric current of the waveform similar to the high-frequency leakage current that is detected is offset usefulness as leakage current, form by means of described amplifying circuit from compressor motor with the coil handle.
4. according to the DC-to-AC converter of the air conditioner described in the claim 2, it is characterized in that,
Described low-frequency filter is by being present in the electrostatic capacitance between a pair of circuit and being installed on the magnetic core and the inductance that is plugged into two a pair of coils on the circuit constitutes;
Described current canceling circuit has: be installed on detecting with coil and utilize pair of transistor that described detecting with the voltage that produces on the coil carried out the amplifying circuit that category-A is recommended amplification on the described low-frequency filter magnetic core; Utilize described detecting to detect to the high-frequency leakage current that ground flows, the electric current of the waveform similar to the high-frequency leakage current that is detected is offset usefulness as leakage current, form by means of described amplifying circuit from compressor motor with the coil handle.
5. according to the DC-to-AC converter of the air conditioner described in the claim 2, it is characterized in that,
Described low-frequency filter is by being present in the electrostatic capacitance between a pair of circuit and being installed on the magnetic core and the inductance that is plugged into two a pair of coils on the circuit constitutes;
Described current canceling circuit has: be installed on a pair of on the described low-frequency filter magnetic core and detect the coil of usefulness and by means of the transistor of correspondence described this detected amplifying circuit with the voltage amplification that produces on the coil respectively; Utilize described respectively detecting with coil detecting to the high-frequency leakage current that ground flows from compressor motor, an electric current of the waveform similar to the high-frequency leakage current that is detected as the leakage current counteracting with, form by means of described amplifying circuit.
6. according to the DC-to-AC converter of each described air conditioner in claim 1～claim 5, it is characterized in that,
Be provided for the Drive and Control Circuit of the described switching circuit of drive controlling, the amplifying circuit integrated circuit of described Drive and Control Circuit with described switching circuit and described current canceling circuit.
7. an air conditioner in the air conditioner of this employing liquid fluorocarbon as the air conditioner refrigeration agent, is characterized in that, by means of the DC-to-AC converter Driven Compressor described in the claim 1.
CN97111483A 1996-05-21 1997-05-21 Inverter for air conditioner and air conditioner thereof Expired - Fee Related CN1086795C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP12575296 1996-05-21
JP125752/96 1996-05-21

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Publication Number Publication Date
CN1167239A CN1167239A (en) 1997-12-10
CN1086795C true CN1086795C (en) 2002-06-26

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CN (1) CN1086795C (en)
TW (1) TW332851B (en)

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Publication number Priority date Publication date Assignee Title
JP5638699B2 (en) * 2011-09-30 2014-12-10 三菱電機株式会社 HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND INVERTER CONTROL METHOD
US9800133B2 (en) * 2016-03-22 2017-10-24 Infineon Technologies Ag Active common mode cancellation
CN114216244B (en) * 2021-11-29 2022-11-25 珠海格力电器股份有限公司 Compressor bus voltage adjusting method and device and compressor

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TW332851B (en) 1998-06-01
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