CN111869070A - Power conversion device - Google Patents
Power conversion device Download PDFInfo
- Publication number
- CN111869070A CN111869070A CN201980020274.8A CN201980020274A CN111869070A CN 111869070 A CN111869070 A CN 111869070A CN 201980020274 A CN201980020274 A CN 201980020274A CN 111869070 A CN111869070 A CN 111869070A
- Authority
- CN
- China
- Prior art keywords
- power supply
- current
- voltage
- transistor
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 29
- 230000000295 complement effect Effects 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 28
- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 238000004378 air conditioning Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 description 25
- 230000003071 parasitic effect Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009499 grossing Methods 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- Power Conversion In General (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a power conversion device which can smoothly provide a compensation current for eliminating a leakage current from a load with an available and relatively simple structure without using a transistor with high withstand voltage as a complementary transistor. The compensation current supply circuit (17) comprises: a complementary transistor (18) having a commonly connected base and a commonly connected emitter; resistance voltage dividing circuits (21, 22) for dividing a direct current power supply and applying the divided voltage to between an emitter and a collector of each of transistors (Tr1, Tr2) constituting the complementary transistor (18); and coupling capacitors (Cs) respectively connected between the DC power supply and the collectors of the transistors.
Description
Technical Field
The present invention relates to a power conversion device having a function of flowing a compensation current for eliminating a leakage current when an alternating current of an arbitrary frequency is supplied to a load through an inverter circuit.
Background
In recent years, hybrid vehicles and electric vehicles have been developed in response to the remarkable global environmental problems, but in these air-conditioning apparatuses for air-conditioning the interior of a vehicle, an electric compressor supplied with power from an on-vehicle battery (dc power supply) is used instead of an engine-driven compressor. In general, an inverter circuit including a plurality of switching elements such as IGBTs is used to convert a dc voltage of a battery into an ac voltage of an arbitrary frequency by PWM modulation and supply the ac voltage to a winding of a motor that drives an electric compressor.
In a drive system of a motor using such an inverter circuit, as a pulse voltage is applied to a winding of the motor due to high-speed switching of each switching element, a high-frequency leakage current (common mode current) flows back through a path to a ground (vehicle body) via a parasitic capacitance between the winding of the motor and a casing of the motor compressor, and common mode noise is generated.
As a means for reducing the common mode current (a portion actually flowing to the ground in the leakage current flowing from the winding of the motor to the casing of the motor-driven compressor), an active EMI filter has been developed. The active EMI filter detects an unbalanced portion of a differential mode current flowing through a common mode coil, that is, a common mode current, using a detection coil added to the common mode coil.
Then, the output current of the detection coil is amplified by flowing through the base of a complementary transistor connected between the dc power supplies. In the complementary transistors, bases and emitters of the NPN-type transistor and the PNP-type transistor are commonly connected, and a compensation current amplified by each transistor is supplied to ground in a phase opposite to a leakage current from a winding of the motor, thereby eliminating the leakage current from the winding of the motor.
Then, a feedback operation is performed so that the compensation result of the common mode current, which is the eliminated leakage current, and the common mode current detected by the detection coil is balanced (see, for example, patent documents 1 and 2).
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3044650
Patent document 2: japanese patent laid-open No. 2000-92861
Disclosure of Invention
Technical problem to be solved by the invention
However, when a battery having a voltage of DC400V or 600V such as an electric vehicle is used, when NPN-type and PNP-type transistors constituting complementary transistors as in patent document 1 are turned off from each other, a high voltage of a DC power supply is applied between an emitter and a collector of each transistor, and therefore, a transistor having a high withstand voltage must be used as each transistor, and selection of an element and acquisition of a component become difficult.
In order to solve this problem, it is conceivable to separately provide a low-voltage power supply for a complementary transistor as in patent document 2, but since the circuit configuration is complicated, a problem of a substrate area and a problem of a high cost occur.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a power conversion device capable of smoothly supplying a compensation current for eliminating a leakage current from a load with an available and relatively simple configuration without using a transistor having a high withstand voltage as a complementary transistor for inputting a power source such as DC400V or DC 600V.
Technical scheme for solving technical problem
The power conversion device of the present invention is a power conversion device for converting a dc voltage supplied from a dc power supply into an ac voltage of an arbitrary frequency by switching of an inverter circuit and supplying the converted voltage to a load, the power conversion device including an active EMI filter circuit having a common mode coil for detecting a leakage current flowing from the load to a ground and a compensation current supply circuit for supplying a compensation current having a phase opposite to that of the leakage current to cancel the leakage current, the compensation current supply circuit including: complementary transistors having a commonly connected base and a commonly connected emitter; a resistance voltage-dividing circuit for dividing a direct-current power supply and applying the divided voltage to between an emitter and a collector of each of transistors constituting the complementary transistor; and coupling capacitors respectively connected between the direct current power supply and the collectors of the transistors.
In the power conversion device according to the invention of claim 2, in the above invention, the complementary transistors are formed of an NPN-type positive-side transistor and a PNP-type negative-side transistor, a collector of the positive-side transistor is connected to a positive-side power supply line of the dc power supply via a coupling capacitor, a collector of the negative-side transistor is connected to a negative-side power supply line of the dc power supply via a coupling capacitor, resistance voltage dividing circuits are connected between the positive-side power supply line and the negative-side power supply line and emitters of the transistors, respectively, and connection points of a plurality of resistances forming the respective resistance voltage dividing circuits are connected to connection points of the collectors of the transistors and the coupling capacitor, respectively.
In the power conversion device according to the invention of claim 3, in each of the above inventions, the dc power source is a battery mounted on the vehicle, and the load is an electric motor for driving an electric compressor of an air conditioner for air-conditioning a vehicle interior of the vehicle.
Effects of the invention
According to the present invention, a power conversion apparatus converts a direct-current voltage supplied from a direct-current power supply into an alternating-current voltage of an arbitrary frequency by switches of an inverter circuit and supplies the alternating-current voltage to a load, in which an active EMI filter circuit is provided, the active EMI filter circuit includes a common mode coil for detecting a leakage current (common mode current) flowing from a load to a ground, and a compensation current supply circuit for causing a compensation current having a phase opposite to that of the leakage current to flow to cancel the leakage current, the compensation current supply circuit being composed of complementary transistors having a commonly connected base and a commonly connected emitter, therefore, by the complementary transistor, the compensation current for eliminating the leakage current flowing from the load to the ground flows to the ground, and the common mode current actually flowing to the ground in the leakage current is reduced, so that the noise generated by the common mode current can be reduced.
In particular, in the present invention, the compensation current supply circuit is provided with a resistance voltage divider circuit for dividing the dc power supply and applying the divided voltage to between the emitter and the collector of each transistor constituting the complementary transistor, respectively, and therefore, the voltage of the dc power supply is divided by the resistance voltage divider circuit and applied to between the emitter and the collector of the transistor constituting the complementary transistor, and it is not necessary to prepare a transistor having a high withstand voltage as a transistor constituting the complementary transistor in particular.
Further, since it is not necessary to provide a special low-voltage power supply for compensating current supply as in patent document 2, the configuration is simplified, and reduction in circuit area and cost can be achieved. Further, since the coupling capacitors are connected between the dc power supply and the collectors of the transistors, respectively, a path from the compensation current to the ground can be secured without any problem.
Specifically, as in the invention of claim 2, the complementary transistor is composed of an NPN-type positive-side transistor and a PNP-type negative-side transistor, a collector of the positive-side transistor is connected to a positive-side power supply line of the dc power supply via a coupling capacitor, a collector of the negative-side transistor is connected to a negative-side power supply line of the dc power supply via a coupling capacitor, resistance voltage dividing circuits are connected between the positive-side power supply line and the negative-side power supply line and between emitters of the transistors, respectively, and connection points of a plurality of resistances constituting the resistance voltage dividing circuits are connected to connection points of the collectors of the transistors and the coupling capacitor, respectively.
In particular, in an air conditioning apparatus for conditioning the interior of a vehicle using a battery mounted on the vehicle as a dc power supply and a motor for driving an electric compressor as a load as in the invention of claim 3, the installation space of the power conversion device in the electric compressor case is also limited, and therefore the invention described above is extremely suitable.
Drawings
Fig. 1 is a circuit diagram of a power conversion apparatus to which an embodiment of the present invention is applied.
Fig. 2 is a circuit diagram of the active EMI filter circuit of fig. 1.
Fig. 3 is a circuit diagram of the compensation current supply circuit of fig. 2.
Fig. 4 is a diagram showing a relationship between a leakage current flowing from the motor of the power conversion device of fig. 1 to the casing of the electric compressor, a compensation current, and a common mode current actually flowing to the ground.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a circuit diagram of a power conversion apparatus 1 according to an embodiment of the present invention. The power converter 1 of the embodiment operates by converting a dc voltage from a battery 3 mounted on a vehicle as a dc power supply into an ac voltage of an arbitrary frequency and supplying the ac voltage to the motor 2, using, as a load, the motor 2 of an electric compressor constituting a refrigerant circuit of a vehicle air conditioner mounted on the vehicle such as an electric vehicle or a hybrid vehicle and configured to air-condition the vehicle interior.
The vehicle to which the present invention is applied is not limited to the above vehicle, and the power conversion device 1 of the present invention is also applied to a general automobile that runs on an engine.
In fig. 1, the power conversion apparatus 1 of the embodiment includes an active EMI filter circuit 8 connected to a positive side power supply line 6(+) and a negative side power supply line 7 (-) of a battery 3, a smoothing capacitor 9 connected to the active EMI filter circuit 8, and a three-phase inverter circuit 11 connected to the smoothing capacitor 9, the three- phase stator windings 2U, 2V, 2W of a motor 2 being connected to the inverter circuit 11.
In the figure, C1 is a parasitic capacitance existing between the windings 2U to 2W and the casing of the electric compressor. Further, in the vehicle, the housing of the electric compressor is connected to the vehicle body, which is grounded.
The inverter circuit 11 is composed of six switching elements 12 such as IGBTs connected in a three-phase bridge, and PWM modulation control is performed on each switching element 12 by a gate drive circuit not shown, so that a pulse-width-controlled rectangular wave voltage is supplied to the windings 2U to 2W of each phase of the motor 2.
As described above, the parasitic capacitance C1 exists between the windings 2U to 2W of the motor 2 and the casing of the motor compressor. Therefore, when a pulse-like voltage is applied to the windings 2U to 2W of the motor 2 in accordance with on/off of the switching elements 12 of the inverter circuit 11, a pulse-like voltage is also applied between the windings 2U to 2W and the ground (vehicle body). According to the voltage change rate at this time, a leakage current I1 flows between the windings 2U to 2W and the casing of the electric compressor via a parasitic capacitance C1. The leakage current I1 becomes a common mode current I3 as a noise current, and flows back to the dc power supply side through the ground (vehicle body).
For the purpose of reducing this common mode current I3, an active EMI filter circuit 8 is provided. The specific circuit of the active EMI filter circuit 8 of the present invention is shown in fig. 2. The active EMI filter circuit 8 of the embodiment has a common mode coil 16 (common mode current detector), a compensation current supply circuit 17 to which the present invention is applied, and a coupling capacitor Co.
The common mode coil 16 is a common mode transformer including two primary windings L1 and L2 and a secondary winding L3 (detection coil), and detects a common mode current I3 including an unbalanced portion of a differential mode current, which is a difference between currents of the positive power supply line 6 and the negative power supply line 7. Therefore, the two primary windings L1, L2 are connected in series with the positive-side power supply line 6 and the negative-side power supply line 7. Then, the output current I4 flows through the secondary winding L3 (detection coil).
On the other hand, a specific circuit of the compensation current supply circuit 17 is shown in fig. 3. The connection points a to E in fig. 3 correspond to the connection points a to E in fig. 2. In the case of the embodiment, the compensation current supply circuit 17 includes a positive side transistor Tr1 and a negative side transistor Tr2 constituting the complementary transistor 18, a 1 st diode D1 and a 2 nd diode D2, a 1 st resistance voltage division circuit 21 constituted by resistances R1 and R2, a 2 nd resistance voltage division circuit 22 constituted by resistances R3 and R4, and two coupling capacitors Cs.
In this case, the positive side transistor Tr1 is an NPN type transistor, and the negative side transistor Tr2 is a PNP type transistor. Therefore, the positive side transistor Tr1 and the negative side transistor Tr2 have polarities opposite to each other. Further, the emitters of the positive side transistor Tr1 and the negative side transistor Tr2 are commonly connected, and are connected to the casing of the electric compressor via a connection point E and a coupling capacitor Co.
The 1 st resistance voltage divider circuit 21 is connected between the emitter of the positive side transistor Tr1 and the positive side power supply line 6 of the battery 3 (dc power supply) via a connection point C. Further, the coupling capacitor Cs is connected between the collector of the positive side transistor Tr1 and the positive side power supply line 6 via a connection point C. Also, a connection point of the resistors R1 and R2 of the 1 st resistance voltage-dividing circuit 21 is connected to a connection point of the collector of the positive side transistor Tr1 and the coupling capacitor Cs.
Thus, a value (voltage) obtained by dividing the voltage of the positive power supply line 6 of the battery 3 (dc power supply) by the resistors R1 and R2 is applied between the emitter and collector of the positive transistor Tr 1. In addition, in order to protect the positive side transistor Tr1, the 1 st diode D1 is connected between the emitter of the positive side transistor Tr1 and the connection point C side of the coupling capacitor Cs in an anti-parallel relationship with the positive side transistor Tr 1.
The 2 nd resistance voltage divider circuit 22 is connected between the emitter of the negative side transistor Tr2 and the negative side power supply line 7 of the battery 3 (dc power supply) via a connection point D. Further, another coupling capacitor Cs is connected between the collector of the negative side transistor Tr2 and the negative side power supply line 7 via a connection point D. Also, a connection point of the resistors R3 and R4 of the 2 nd resistance voltage dividing circuit 22 is connected to a connection point of the collector of the negative side transistor Tr2 and the coupling capacitor Cs.
Thus, a value (voltage) obtained by dividing the voltage of the negative power supply line 7 of the battery 3 (dc power supply) by the resistors R3 and R4 is also applied between the emitter and collector of the negative transistor Tr 2. In addition, in order to protect the negative side transistor Tr2, a 2 nd diode D2 is connected between the emitter of the negative side transistor Tr2 and the connection point D side of the coupling capacitor Cs in an anti-parallel relationship with the negative side transistor Tr 2.
The bases of the positive side transistor Tr1 and the negative side transistor Tr2 constituting the complementary transistor 18 are commonly connected, one output line of the secondary winding L3 (detection coil) of the common mode coil 16 is connected to the commonly connected base via a connection point B, and an output current I4 is configured to flow therein, and the commonly connected emitters of the positive side transistor Tr1 and the negative side transistor Tr2 are connected to the other output line of the secondary winding L3 via a connection point a. Therefore, the positive side transistor Tr1 and the negative side transistor Tr2 operate in reverse to each other in accordance with the output polarity of the secondary winding L3.
Next, the operation of the power conversion device 1 of the embodiment will be described. The output (direct current) of the battery 3 is smoothed by the smoothing capacitor 9 and becomes an input voltage of the inverter circuit 11. The six switching elements 12 of the inverter circuit 11 are on/off controlled by well-known PWM pulses. The motor 2 is driven by the output voltage of the inverter circuit 11.
As described above, the parasitic capacitance C1 exists between the windings 2U to 2W of the motor 2 as a load and the casing of the electric compressor. Therefore, each time a voltage is applied in pulses from the inverter circuit 11, the leakage current I1 flows to the casing of the electric compressor through the parasitic capacitance C1, and the current becomes the common mode current I3 and flows to the ground (vehicle body).
The common mode coil 16 of the active EMI filter circuit 8 detects the common mode current I3 in the positive side power supply line 6 and the negative side power supply line 7, outputs the output current I4 to the secondary winding L3 according to the winding ratio of the primary windings L1, L2 and the secondary winding L3, and drives the positive side transistor Tr1 and the negative side transistor Tr2 of the complementary transistor 18 constituting the compensation current supply circuit 17.
When the output current I4 of the common mode coil 16 flows into the bases of the positive side transistor Tr1 and the negative side transistor Tr2, the output current I4 of the common mode coil 16 is amplified by the respective transistors Tr1, Tr 2. When the positive side transistor Tr1 is turned on, the compensation current I2 flows to the ground (vehicle body) through a path constituted by the coupling capacitor Cs, the positive side transistor Tr1, the coupling capacitor Co, and the parasitic capacitance C1 of the motor 2, and the leakage current I1 of the motor 2 is eliminated, so that the common mode current I3 flowing to the ground (vehicle body) is made extremely small.
When the negative side transistor Tr2 is turned on, the compensation current I2 flows from the ground (vehicle body) to the casing of the electric compressor through a path composed of the coupling capacitor Co, the negative side transistor Tr2, and the coupling capacitor Cs. The effect of the compensation current I2 on reducing the common mode current I3 occurs similarly to the case where the positive side transistor Tr1 is turned on.
Fig. 4 shows this situation. The sum of the leakage current I1 and the compensation current I2 in the opposite phase becomes the common mode current I3(I1+ I2 — I3). The compensation current supply circuit 17 actively compensates the leakage current I1 as a result of the common mode current I3 cancelled by the feedback leakage current I1 and the compensation current I2.
As described above in detail, the present invention provides the active EMI filter circuit 8, and the active EMI filter circuit 8 includes: a common mode coil 16 for detecting a common mode current I3 in a leakage current I1 flowing from the motor 2 to the casing of the electric compressor; and a compensation current supply circuit 17, wherein the compensation current supply circuit 17 is configured to cause a compensation current I2 having a phase opposite to that of the leakage current I1 to flow to the ground to eliminate the leakage current I1, and the compensation current supply circuit 8 is configured by complementary transistors 18(Tr1, Tr2) having a commonly connected base and a commonly connected emitter, so that the compensation current I2 for eliminating the leakage current I1 flowing from the motor 2 to the casing of the electric compressor is caused to flow by the action of the complementary transistors 18, and the common mode current I3, which is the leakage current actually flowing to the ground (vehicle body) in the leakage current I1, is reduced, thereby reducing the noise generated by the common mode current I3.
In particular, in the present invention, the compensation current supply circuit 17 is provided with the 1 st and 2 nd resistance voltage-dividing circuits 21, 22 for dividing the voltage of the battery 3 (direct current power supply) and applying the divided voltage between the emitter-collector of the positive side transistor Tr1 and the negative side transistor Tr2 constituting the complementary transistor 18, respectively, and therefore, the voltage of the battery 3 is divided by the resistance voltage-dividing circuits 21, 22 and applied between the emitter-collector of the positive side transistor Tr1 and the negative side transistor Tr2 constituting the complementary transistor 18.
Thus, it is not necessary to prepare particularly high-withstand-voltage transistors as the positive side transistor Tr1 and the negative side transistor Tr2 constituting the complementary transistor 18. Further, since it is not necessary to provide a special low-voltage power supply for compensating current supply as in the conventional art, the configuration is simplified, and reduction in circuit area and cost can be achieved. Further, since the coupling capacitors Cs are connected between the battery 3 (direct current power supply) and the collectors of the positive side transistor Tr1 and the negative side transistor Tr2, respectively, a path of the compensation current to the ground (vehicle body) can also be secured without hindrance.
In particular, in an air conditioning apparatus for conditioning air in a vehicle interior of a vehicle, as in the embodiment, the power conversion apparatus 1 is extremely suitable because the installation space in the casing of the electric compressor is limited, in which the battery 3 mounted on the vehicle is used as a dc power supply and the electric motor 2 driving the electric compressor is used as a load.
In the embodiment, the present invention is applied to a power conversion device in which the motor 2 of the electric compressor constituting the refrigerant circuit of the air conditioner for a vehicle is used as a load, and the dc voltage from the battery mounted on the vehicle as the dc power supply is converted into the ac voltage of an arbitrary frequency and supplied to the motor, but the invention of claim 1 and claim 2 is not limited thereto, and the present invention is also effective for a household/commercial device in which a commercial ac power supply is rectified to be used as the dc power supply and the load such as the motor is driven by an inverter circuit.
Description of the reference symbols
1 power conversion device
2 electric motor (load)
3 batteries (DC power supply)
6 positive side power line
7 negative side power line
8 active EMI filter circuit
11 inverter circuit
12 switching element
16 common mode coil
17 compensating current supply circuit
18 complementary transistor
21. 22 resistance voltage-dividing circuit
Cs coupling capacitor
Tr1 positive side transistor
Tr2 negative side transistor.
Claims (3)
1. A power conversion apparatus which converts a DC voltage supplied from a DC power supply into an AC voltage of an arbitrary frequency by switches of an inverter circuit and supplies the AC voltage to a load,
Includes an active EMI filter circuit having a common mode coil for detecting a leakage current flowing from the load to ground and a compensation current supply circuit for flowing a compensation current of a phase opposite to that of the leakage current to cancel the leakage current,
the compensation current supply circuit includes: a complementary transistor having a commonly connected base and a commonly connected emitter;
a resistance voltage dividing circuit for dividing the direct current power supply and applying the divided voltage to between an emitter and a collector of each of the transistors constituting the complementary transistor; and
and coupling capacitors connected between the direct current power supply and collectors of the transistors, respectively.
2. The power conversion apparatus according to claim 1,
the complementary transistors are composed of an NPN type positive side transistor and a PNP type negative side transistor,
a collector of the positive-side transistor is connected to a positive-side power supply line of the direct-current power supply via the coupling capacitor, a collector of the negative-side transistor is connected to a negative-side power supply line of the direct-current power supply via the coupling capacitor,
The resistance voltage-dividing circuits are connected between the positive power supply line and the negative power supply line and between the emitters of the transistors, respectively, and connection points of a plurality of resistors constituting each resistance voltage-dividing circuit are connected to connection points of the collectors of the transistors and the coupling capacitors, respectively.
3. The power conversion apparatus according to claim 1 or 2,
the dc power supply is a battery mounted on a vehicle, and the load is a motor that drives an electric compressor of an air conditioner for air-conditioning a vehicle interior of the vehicle.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-078467 | 2018-04-16 | ||
| JP2018078467A JP7009292B2 (en) | 2018-04-16 | 2018-04-16 | Power converter |
| PCT/JP2019/015922 WO2019203143A1 (en) | 2018-04-16 | 2019-04-12 | Power conversion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111869070A true CN111869070A (en) | 2020-10-30 |
Family
ID=68240179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980020274.8A Pending CN111869070A (en) | 2018-04-16 | 2019-04-12 | Power conversion device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7009292B2 (en) |
| CN (1) | CN111869070A (en) |
| DE (1) | DE112019001972T5 (en) |
| WO (1) | WO2019203143A1 (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3044650B2 (en) * | 1996-03-27 | 2000-05-22 | 勲 高橋 | Power converter noise reduction device |
| CN1360392A (en) * | 2000-12-19 | 2002-07-24 | 富士电机株式会社 | Noise reducing device for electric power conversion device |
| CN1465130A (en) * | 2001-06-29 | 2003-12-31 | 薛承基 | Active common mode emi filter mitigating conducted electromagnetic interference |
| JP2004364344A (en) * | 2003-06-02 | 2004-12-24 | Hitachi Home & Life Solutions Inc | Leakage current canceller circuit |
| JP2007275315A (en) * | 2006-04-07 | 2007-10-25 | Kowa Co | Intraocular pressure measuring instrument |
| WO2007125989A1 (en) * | 2006-04-27 | 2007-11-08 | Sanken Electric Co., Ltd. | Noise reduction reactor and noise reduction device |
| JP2008187759A (en) * | 2007-01-26 | 2008-08-14 | Funai Electric Co Ltd | Switching power supply circuit |
| JP2008220109A (en) * | 2007-03-07 | 2008-09-18 | Doshisha | Common-mode leakage current restraining circuit applied to power conversion apparatus |
| CN103155388A (en) * | 2010-08-26 | 2013-06-12 | 三菱电机株式会社 | Leakage current reduction device |
| CN103595243A (en) * | 2013-11-23 | 2014-02-19 | 大连尚能科技发展有限公司 | Method suitable for suppressing common mode electromagnetic interference in wind driven generator driving system |
| CN104067496A (en) * | 2012-01-27 | 2014-09-24 | 大金工业株式会社 | Power conversion circuit |
| CN203982242U (en) * | 2013-11-28 | 2014-12-03 | 苏州贝克微电子有限公司 | A kind of control circuit of voltage stabilizer saturation current |
| CN203984392U (en) * | 2013-11-27 | 2014-12-03 | 苏州贝克微电子有限公司 | The line drive that a kind of transmission time is controlled |
| CN104602423A (en) * | 2011-09-14 | 2015-05-06 | 路创电子公司 | Two-wire dimmer switch for low-power loads |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6903362A (en) * | 1969-03-05 | 1970-09-08 | ||
| JPS62128470A (en) * | 1985-11-28 | 1987-06-10 | 株式会社東芝 | Induction heating cooker |
| JP2003044650A (en) * | 2001-07-31 | 2003-02-14 | Hiranoya Business Research:Kk | Information acquisition system |
-
2018
- 2018-04-16 JP JP2018078467A patent/JP7009292B2/en active Active
-
2019
- 2019-04-12 WO PCT/JP2019/015922 patent/WO2019203143A1/en active Application Filing
- 2019-04-12 CN CN201980020274.8A patent/CN111869070A/en active Pending
- 2019-04-12 DE DE112019001972.4T patent/DE112019001972T5/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3044650B2 (en) * | 1996-03-27 | 2000-05-22 | 勲 高橋 | Power converter noise reduction device |
| CN1360392A (en) * | 2000-12-19 | 2002-07-24 | 富士电机株式会社 | Noise reducing device for electric power conversion device |
| CN1465130A (en) * | 2001-06-29 | 2003-12-31 | 薛承基 | Active common mode emi filter mitigating conducted electromagnetic interference |
| JP2004364344A (en) * | 2003-06-02 | 2004-12-24 | Hitachi Home & Life Solutions Inc | Leakage current canceller circuit |
| JP2007275315A (en) * | 2006-04-07 | 2007-10-25 | Kowa Co | Intraocular pressure measuring instrument |
| WO2007125989A1 (en) * | 2006-04-27 | 2007-11-08 | Sanken Electric Co., Ltd. | Noise reduction reactor and noise reduction device |
| JP2008187759A (en) * | 2007-01-26 | 2008-08-14 | Funai Electric Co Ltd | Switching power supply circuit |
| JP2008220109A (en) * | 2007-03-07 | 2008-09-18 | Doshisha | Common-mode leakage current restraining circuit applied to power conversion apparatus |
| CN103155388A (en) * | 2010-08-26 | 2013-06-12 | 三菱电机株式会社 | Leakage current reduction device |
| CN104602423A (en) * | 2011-09-14 | 2015-05-06 | 路创电子公司 | Two-wire dimmer switch for low-power loads |
| CN104067496A (en) * | 2012-01-27 | 2014-09-24 | 大金工业株式会社 | Power conversion circuit |
| CN103595243A (en) * | 2013-11-23 | 2014-02-19 | 大连尚能科技发展有限公司 | Method suitable for suppressing common mode electromagnetic interference in wind driven generator driving system |
| CN203984392U (en) * | 2013-11-27 | 2014-12-03 | 苏州贝克微电子有限公司 | The line drive that a kind of transmission time is controlled |
| CN203982242U (en) * | 2013-11-28 | 2014-12-03 | 苏州贝克微电子有限公司 | A kind of control circuit of voltage stabilizer saturation current |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7009292B2 (en) | 2022-01-25 |
| JP2019187176A (en) | 2019-10-24 |
| WO2019203143A1 (en) | 2019-10-24 |
| DE112019001972T5 (en) | 2020-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8432710B2 (en) | Power conversion apparatus | |
| US6459597B1 (en) | Electric power conversion apparatus with noise reduction device | |
| US6002603A (en) | Balanced boost/buck DC to DC converter | |
| JP5505417B2 (en) | Output filter and electric motor drive system including the same | |
| US4920475A (en) | Integrated traction inverter and battery charger apparatus | |
| US20140265945A1 (en) | Electric Drive System | |
| US6262896B1 (en) | Auxiliary power conversion for an electric vehicle using high frequency injection into a PWM inverter | |
| US7583523B2 (en) | Three phase inverter control circuit detecting two phase currents and deducting or adding identical ON periods | |
| EP0986165A2 (en) | Power conversion system | |
| JP5655367B2 (en) | Motor drive device | |
| JP2013132197A (en) | Electric power conversion system and charging system | |
| US9979291B2 (en) | Inverter apparatus | |
| US10193488B2 (en) | Methods and systems for reducing conducted electromagnetic interference | |
| US11114949B2 (en) | Inverter control board that is configured so that a detection circuit is appropriately arranged | |
| JP3912096B2 (en) | Noise reduction device for power converter | |
| US20170110986A1 (en) | Power conversion system | |
| US9979298B2 (en) | Rectifier bridge circuit, corresponding apparatus and method | |
| JP3277166B2 (en) | Power converter | |
| US8310278B2 (en) | Voltage detection device | |
| JP2018050243A (en) | Switching element driver circuit | |
| JP3899850B2 (en) | Power supply | |
| CN111869070A (en) | Power conversion device | |
| JP3656705B2 (en) | Voltage type inverter | |
| KR20190090542A (en) | Active power filter and air conditioner comprising the same | |
| JP5370753B2 (en) | Power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20221205 Address after: Ise City Shou Qi Japanese qunma County town 20 times Applicant after: SANDEN Corp. Address before: Gunma Applicant before: SANDEN AUTOMOTIVE CONPONENTS Corp. |