WO2020208825A1 - Power conversion device and air conditioner - Google Patents

Power conversion device and air conditioner Download PDF

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Publication number
WO2020208825A1
WO2020208825A1 PCT/JP2019/016035 JP2019016035W WO2020208825A1 WO 2020208825 A1 WO2020208825 A1 WO 2020208825A1 JP 2019016035 W JP2019016035 W JP 2019016035W WO 2020208825 A1 WO2020208825 A1 WO 2020208825A1
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WO
WIPO (PCT)
Prior art keywords
wiring
conversion device
power conversion
noise
converter
Prior art date
Application number
PCT/JP2019/016035
Other languages
French (fr)
Japanese (ja)
Inventor
友仁 杉森
Original Assignee
三菱電機株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021513148A priority Critical patent/JP7204894B2/en
Priority to PCT/JP2019/016035 priority patent/WO2020208825A1/en
Publication of WO2020208825A1 publication Critical patent/WO2020208825A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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

Definitions

  • the present invention relates to a power converter and an air conditioner that perform power conversion.
  • a power conversion device having a common mode choke coil is known.
  • Noise caused by the switching operation of the inverter of the power converter is included in the common mode current that flows in common to the wiring pattern of the power converter due to the presence of floating capacitance between the wiring pattern of the power converter and the ground. There is. Such noise may be conducted to the other device when the power conversion device and the other device use a common power source.
  • the common mode choke coil removes common mode noise, which is conduction noise due to the common mode current.
  • Patent Document 1 discloses a power conversion device having a common mode choke coil, an AC side phase capacitor, and a DC side phase capacitor.
  • the AC side interphase capacitor removes common mode noise on the AC side of the converter of the power converter.
  • the DC side interphase capacitor removes common mode noise on the DC side of the converter.
  • the AC side-phase capacitor and the DC side-phase capacitor are connected to the ground by using a lead wire.
  • the lead wire is connected to a structure having the same potential as the ground, such as the housing of the power conversion device or the housing of the device on which the power conversion device is mounted.
  • the power conversion device removes the common mode noise from the wiring pattern of the power conversion device by transmitting the common mode noise from the AC side phase capacitor and the DC side phase capacitor to the ground via the lead wire.
  • the inductance component of the lead wire works effectively, and the AC side phase capacitor and the DC side phase capacitor The conduction of noise between them is prevented.
  • the number of lead wires increases as the number of AC side-phase capacitors and DC side-phase capacitors mounted on the power conversion device increases.
  • the number of lead wires increases, the number of parts required for manufacturing the power converter increases and the number of work steps for installing the lead wires increases, so that the manufacturing cost of the power converter increases.
  • many lead wires are routed, which complicates the mode in which noise is transmitted. Therefore, when trying to reduce noise in the device, it becomes difficult to identify the noise source and the noise transmission path.
  • the AC side phase capacitor and the DC side phase capacitor are connected. Since there is no appropriate impedance in the damaged part, the noise on the AC side and the noise on the DC side interfere with each other in the wiring pattern. In the power conversion device, the noise on the AC side and the noise on the DC side interfere with each other, so that the noise is further increased. As described above, the conventional power conversion device has a problem that it is difficult to reduce noise with a small number of ground wires.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a power conversion device capable of reducing noise with a small number of ground wires.
  • the power conversion device is connected between the converter and the inverter connected between the AC power supply and the load, and between the AC power supply and the converter.
  • a common ground wire is used for grounding each of the AC side phase capacitor and the DC side phase capacitor.
  • An electronic component having an inductance component is provided in each of the wiring between the AC side phase capacitor and the ground wire and the wiring between the DC side phase capacitor and the ground wire.
  • the power conversion device according to the present invention has an effect that noise can be reduced with a small number of ground wires.
  • FIG. 1 is a diagram showing a configuration example of a power conversion device according to a first embodiment of the present invention.
  • the power conversion device 100 includes a converter 4 and an inverter 5 connected between the commercial AC power supply 1 and the load 20.
  • An example of the load 20 is a motor for driving a compressor provided in an outdoor unit of an air conditioner. Electric power is supplied to the motor by the electric power converter 100 mounted on the outdoor unit.
  • the commercial AC power supply 1 outputs a single-phase AC voltage to the power converter 100.
  • the converter 4 converts an AC voltage into a DC voltage by a rectifying action.
  • the inverter 5 converts the DC voltage output by the converter 4 into a three-phase AC voltage.
  • the power conversion device 100 applies the AC voltage output by the inverter 5 to the load 20.
  • Each of the input terminals of the converter 4 is connected to the commercial AC power supply 1 via a power supply line.
  • Each of the output terminals of the converter 4 is connected to the input terminal of the inverter 5 via a power supply line.
  • the power supply line connecting the commercial AC power supply 1 and the converter 4 may be referred to as an AC line
  • the power supply line between the converter 4 and the inverter 5 may be referred to as a DC line.
  • the power conversion device 100 has a smoothing capacitor 11 connected in parallel to the converter 4.
  • the smoothing capacitor 11 is connected between the DC lines on the inverter 5 side of the converter 4.
  • the smoothing capacitor 11 smoothes the DC voltage output by the converter 4.
  • a DC voltage smoothed by the smoothing capacitor 11 is applied to the inverter 5.
  • the power conversion device 100 includes a common mode choke coil 2 connected between the commercial AC power supply 1 and the converter 4, an X capacitor 6 which is an AC side line capacitor, and Y capacitors 7a and 7b which are AC side phase capacitors. It has 8a and 8b and Y capacitors 9a and 9b which are DC side phase capacitors.
  • the common mode choke coil 2, the X capacitor 6, and the Y capacitors 7a, 7b, 8a, and 8b function as a filter circuit for removing noise in the AC line.
  • the Y capacitors 9a and 9b function as a filter circuit for removing noise in the DC line.
  • the X capacitor 6 is connected between AC lines on the commercial AC power supply 1 side of the common mode choke coil 2.
  • the Y capacitor 7a and the Y capacitor 7b are connected between the AC lines on the common mode choke coil 2 side of the AC line from the position where the X capacitor 6 is connected.
  • the Y capacitor 7a and the Y capacitor 7b are connected in series with each other via the connection point 16.
  • the Y capacitor 8a and the Y capacitor 8b are connected between the AC lines on the converter 4 side of the common mode choke coil 2.
  • the Y capacitor 8a and the Y capacitor 8b are connected in series with each other via a connection point 17.
  • the Y capacitor 9a and the Y capacitor 9b are connected between the DC lines on the inverter 5 side of the DC line from the position where the smoothing capacitor 11 is connected.
  • the Y capacitor 9a and the Y capacitor 9b are connected in series with each other via a connection point 18.
  • the power conversion device 100 has an output terminal 22 for outputting a single-phase AC voltage.
  • Each of the output terminals 22 is located at the end of a branch line branched from the AC line connecting the commercial AC power supply 1 and the converter 4.
  • an indoor unit included in the air conditioner is connected to the output terminal 22.
  • the power conversion device 100 has a common mode choke coil 3 connected between the commercial AC power supply 1 and the output terminal 22, and Y capacitors 10a and 10b which are AC side phase capacitors.
  • the common mode choke coil 3 and the Y capacitors 10a and 10b function as a filter circuit for removing noise in the branch line.
  • the Y capacitor 10a and the Y capacitor 10b are connected between the branch lines on the output terminal 22 side of the common mode choke coil 3 among the branch lines.
  • the Y capacitor 10a and the Y capacitor 10b are connected in series with each other via a connection point 19.
  • the wiring drawn out from the connection point 16, the wiring drawn out from the connection point 17, the wiring drawn out from the connection point 18, and the wiring drawn out from the connection point 19 are one ground wire 21. It is connected to the. Each wiring is connected to the ground via the ground wire 21. As a result, a common ground wire 21 is used for grounding each of the Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b.
  • the ground wire 21 is connected to the housing of the power conversion device 100 or the housing of the outdoor unit.
  • the power conversion device 100 collectively grounds the Y capacitors 7a, 7b, the Y capacitors 8a, 8b, the Y capacitors 9a, 9b, and the Y capacitors 10a, 10b by using the ground wire 21. To do.
  • the power conversion device 100 has ferrite beads 12, 13, 14, and 15 which are electronic components having an inductance component.
  • the ferrite beads 12 are provided in the wiring between the connection point 16 and the ground wire 21.
  • the ferrite beads 13 are provided in the wiring between the connection point 17 and the ground wire 21.
  • the ferrite beads 14 are provided in the wiring between the connection point 18 and the ground wire 21.
  • the ferrite beads 15 are provided in the wiring between the connection point 19 and the ground wire 21.
  • the ferrite beads 12, 13, 14 and 15 cause the energy of the current in the high frequency region to be lost due to the inductance component.
  • the ferrite beads 12, 13, 14, 15 absorb noise by losing the energy of the electric current.
  • ferrite beads 12 are provided in the wiring between the Y capacitors 7a and 7b and the ground wire 21.
  • Ferrite beads 13 are provided in the wiring between the Y capacitors 8a and 8b and the ground wire 21.
  • Ferrite beads 14 are provided in the wiring between the Y capacitors 9a and 9b and the ground wire 21.
  • Ferrite beads 15 are provided in the wiring between the Y capacitors 10a and 10b and the ground wire 21. That is, electronic components having an inductance component are provided in each of the wiring between the AC side phase capacitor and the ground wire 21 and the wiring between the DC side phase capacitor and the ground wire 21.
  • FIG. 2 is a diagram schematically showing an embodiment of mounting of an AC side-phase capacitor and a DC side-phase capacitor included in the power conversion device shown in FIG. 1.
  • the Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b are mounted on the electronic circuit board 25.
  • the electronic circuit board 25 is a board on which the electronic circuit of the power conversion device 100 is mounted. The inside of the electronic circuit is filled with noise of various frequencies according to the operating state of the converter 4 and the inverter 5 shown in FIG.
  • the wiring 23 connects the input terminal of the electronic circuit board 25 to the commercial AC power supply 1.
  • the wiring 24 connects the output terminal of the electronic circuit board 25 and the load 20.
  • FIG. 2 shows a state in which the components provided on the electronic circuit board 25 are viewed from above the electronic circuit board 25. Note that, in FIG. 2, only the components necessary for explanation among the components mounted on the electronic circuit board 25 are shown, and the illustration of other components is omitted.
  • the Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b and the ground wire 21 are connected to each other via a wiring pattern on the electronic circuit board 25.
  • the power conversion device 100 can collectively ground each of the AC side-phase capacitor and the DC side-phase capacitor by using the common grounding wire 21.
  • the Y capacitors 7a, 7b, the Y capacitors 8a, 8b, the Y capacitors 9a, 9b, and the Y capacitors 10a, 10b If the configurations are grounded independently of each other, a lead wire for grounding will be provided in each configuration.
  • the power converter 100 is connected to the lead wire connecting the connection point 16 and the ground, the lead wire connecting the connection point 17 and the ground, and the connection point 18 and the ground, as in the case of the prior art.
  • a lead wire and a lead wire connecting the connection point 19 and the ground are provided.
  • the power conversion device 100 eliminates the need for lead wires for each configuration by collectively grounding each configuration by the ground wire 21.
  • the power conversion device 100 can reduce the number of parts required for manufacturing the power conversion device 100 as compared with the case where each configuration is grounded independently of each other. Further, in the manufacture of the power conversion device 100, a work process for installing lead wires for each configuration becomes unnecessary. As a result, the power conversion device 100 can reduce the manufacturing cost as compared with the case where each configuration is grounded independently of each other.
  • Ferrite beads 12, 13, 14, and 15 are provided on a wiring pattern that connects the Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b and the ground wire 21.
  • the power conversion device 100 can suppress interference between noise on the AC side and noise on the DC side in the wiring pattern.
  • the power conversion device 100 can prevent an increase in noise due to interference between noise on the AC side and noise on the DC side, and can enhance the noise reduction effect.
  • the lead wires used when the configurations are grounded independently of each other usually have a length of 10 cm to 20 cm. Further, a general lead wire has an inductance of 1 nH / cm.
  • each wiring has an inductance equivalent to that of a lead wire by means of ferrite beads 12, 13, 14, 15 provided in each wiring between each configuration and the ground wire 21. I'm letting you. As a result, the power converter 100 can remove noise in the same manner as when the configurations are grounded independently of each other.
  • the number of ground wires 21 provided in the power conversion device 100 is not limited to one, and may be plural.
  • the power conversion device 100 grounds at least a part of a plurality of interphase capacitors, which are an AC side-phase capacitor and a DC-side phase capacitor, at once, so that each of the plurality of phase capacitors is grounded independently of each other.
  • the number of ground wires 21 can be reduced as compared with the above.
  • the electronic circuit configuration of the power converter 100 can be changed according to the performance required in the air conditioner.
  • the frequency and intensity of noise generated in the electronic circuit also change.
  • the power conversion device 100 is provided with ferrite beads 12, 13, 14, and 15 having characteristics that match the noise generated in the electronic circuit.
  • the inductance values of the ferrite beads 12, 13, 14, and 15 can be set to optimum values according to the noise frequency. As a result, the power converter 100 can obtain a higher noise reduction effect.
  • the characteristics of the ferrite beads 12, 13, 14, and 15 may be the same as each other. Further, at least one of the ferrite beads 12, 13, 14 and 15 may have different characteristics from the others.
  • the characteristics of the ferrite beads 12, 13, 14 and 15 can be determined according to the configuration of the electronic circuit. That is, the inductance values of the ferrite beads 12, 13, 14, and 15 can be appropriately determined according to the configuration of the electronic circuit.
  • the inductance values of the ferrite beads 12, 13 and 15 provided on the AC side interphase capacitor and the inductance values of the ferrite beads 14 provided on the DC side interphase capacitor are 20 nH
  • the inductance values of the ferrite beads 14 are 10 nH.
  • the inductance values of the ferrite beads 12, 13, 14, and 15 focus on either suppressing the generation of noise that can be conducted to other components or preventing the conduction of noise from other components. Can be determined by By appropriately determining the inductance values of the ferrite beads 12, 13, 14, and 15, it is possible to classify a circuit in which noise generation is desired to be reduced and a circuit in which noise transmission from other circuits is desired to be prevented.
  • the inductance values of the ferrite beads 12, 13, 14, and 15 can be set in the range of 1 nH to 100 nH.
  • the power conversion device 100 may include electronic components having an inductance component other than the ferrite beads 12, 13, 14, and 15.
  • an electronic component having an inductance component such as a normal mode choke coil can be used.
  • the ferrite beads 12, 13, 14, 15 or the normal mode choke coil is smaller than the common mode choke coils 2 and 3. Therefore, the power conversion device 100 can suppress the enlargement of the electronic circuit as compared with the case where the common mode choke coil similar to the common mode choke coils 2 and 3 is used for the electronic component.
  • the power conversion device 100 can reduce the number of ground wires 21 by using a common ground wire 21 for grounding each of the AC side phase capacitor and the DC side phase capacitor. Further, in the power conversion device 100, electronic components having an inductance component are provided in each of the wiring between the AC side phase capacitor and the ground wire 21 and the wiring between the DC side phase capacitor and the ground wire 21. , Noise can be effectively reduced. As described above, the power conversion device 100 has an effect that noise can be reduced by using a small number of ground wires 21.
  • FIG. 3 is a diagram showing a schematic configuration of a power conversion device according to a second embodiment of the present invention.
  • FIG. 4 is a diagram showing the power conversion device shown in FIG. 3 and a housing used for grounding the power conversion device.
  • the second embodiment an example of a housing used for grounding the power conversion device 100 will be described.
  • the same components as those in the first embodiment are designated by the same reference numerals, and the configurations different from those in the first embodiment will be mainly described.
  • the housing 26 encloses the components in the power conversion device 100 shown in FIG.
  • the wall portion 27 is attached to the inside of the housing 26 and partitions the space inside the housing 26.
  • the housing 26 and the wall portion 27 are formed by using sheet metal.
  • the housing 26 and the wall portion 27 form a shield portion that blocks the conduction of noise.
  • the wiring 24 connects the output terminal of the electronic circuit board 25 and the load 20.
  • the wiring 23 connects the input terminal of the electronic circuit board 25 to the commercial AC power supply 1.
  • the configuration shown in FIG. 3 is the configuration in which the wall portion 27 and the wiring 28 are added to the configuration shown in FIG.
  • FIG. 4 shows a side view of the components provided in the housing 26.
  • the ground wire 21 is connected to the housing 26.
  • the wiring 28 is a wiring for connecting the power conversion device 100 and an external device of the power conversion device 100, and refers to the entire wiring such as communication lines and signal lines other than the wires 23 and 24 and the ground line 21. To do.
  • the wiring 28 includes a wiring for supplying electric power from the power conversion device 100 to the indoor unit, a communication line for communicating with an external control system of the power conversion device 100, and a wiring for supplying electric power to the thermista. And wiring for supplying power to the four-way valve.
  • the thermistor measures the temperature at each part of the air conditioner.
  • the four-way valve switches the refrigerant circuit according to the switching of operation between cooling and heating of the air conditioner.
  • the ground wire 21 and the wiring 23 are the first wiring
  • the wiring 24 and the wiring 28 are the second wiring.
  • the first wiring is a wiring that generates a lot of noise among the wiring provided in the power conversion device 100.
  • the second wiring is wiring other than the first wiring among the wirings provided in the power conversion device 100, and is a wiring that generates less noise than the first wiring.
  • the first wiring is provided in the area surrounded by the housing 26 and the wall portion 27.
  • the second wiring is provided outside the area surrounded by the housing 26 and the wall portion 27.
  • the shield portion including the housing 26 and the wall portion 27 blocks the conduction of noise from the first wiring to the second wiring by surrounding the area where the first wiring is provided.
  • the power conversion device 100 can suppress the noise radiated from the first wiring from being conducted to the second wiring.
  • the power conversion device 100 can prevent problems such as malfunction due to noise conduction from the first wiring to the second wiring.
  • grounding of each interphase capacitor can be easily realized by connecting the grounding wire 21 to the shield portion in the region where the first wiring is provided.
  • the area where the grounding wire 21 is provided can be easily limited as compared with the case where the grounding wire 21 is distributed to each of the interphase capacitors. be able to.
  • the power conversion device 100 can arrange the ground wire 21 away from the wiring that is easily affected by noise. Further, the power conversion device 100 can easily surround the area where the first wiring is provided by the shield portion.
  • the wall portion 27 does not reach the electronic circuit board 25, and a gap is provided between the electronic circuit board 25 and the wall portion 27.
  • the wall portion 27 may reach the electronic circuit board 25.
  • the wall portion 27 may penetrate the electronic circuit board 25.
  • the shield portion can enhance the shielding property that suppresses the conduction of noise.
  • the housing 26 and the wall portion 27 are not limited to those formed by using sheet metal.
  • the housing 26 and the wall portion 27 may be made of a material having a property of suppressing noise conduction.
  • the shape of the shield portion is not limited to the shape composed of the housing 26 and the wall portion 27 shown in FIG. 4, and can be freely changed.
  • the shield portion is not limited to that realized by the housing 26 and the wall portion 27.
  • the shield portion may be realized by components other than the housing 26 and the wall portion 27.
  • the shield portion may be realized by the aluminum electrolytic capacitor used for the smoothing capacitor 11 shown in FIG.
  • the power conversion device 100 can suppress the conduction of noise from the first wiring to the second wiring by providing the shield portion. As a result, the power converter 100 has the effect of being able to further reduce noise.
  • FIG. 5 is a diagram showing a schematic configuration of an air conditioner according to a third embodiment of the present invention.
  • the air conditioner 200 adjusts the temperature and humidity of the indoor space by sending an air flow for air conditioning to the indoor space.
  • the air conditioner 200 switches operation modes such as cooling, blowing, dehumidifying, and heating so that the room temperature becomes a target temperature.
  • the air conditioner 200 is a separate type air conditioner in which the outdoor unit 201 is separated from the indoor unit 202.
  • the outdoor unit 201 and the indoor unit 202 are connected via a refrigerant pipe 36.
  • the refrigerant is filled in the refrigerant pipe 36, and the refrigerant circulates between the outdoor unit 201 and the indoor unit 202 via the refrigerant pipe 36, so that the air conditioner 200 exchanges heat between the indoor and outdoor units. ..
  • the outdoor unit 201 has a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, an expansion valve 34, and a fan 39.
  • the compressor 31 is provided with a compression mechanism 37 that compresses the refrigerant and a motor 38 that operates the compression mechanism 37.
  • the outdoor unit 201 has a power conversion device 100 according to the first or second embodiment.
  • the motor 38 is the load 20 shown in FIG. The motor 38 is driven by the power supply from the power converter 100.
  • the indoor unit 202 has an indoor heat exchanger 35 and a fan 40.
  • the compressor 31, the four-way valve 32, the outdoor heat exchanger 33, the expansion valve 34, and the indoor heat exchanger 35 are connected via a refrigerant pipe 36.
  • the compressor 31, the four-way valve 32, the outdoor heat exchanger 33, the expansion valve 34, and the indoor heat exchanger 35 form a refrigeration cycle that is a closed circuit for circulating the refrigerant.
  • the components of the air conditioner 200 can also be applied to equipment such as a refrigerator or a freezer equipped with a refrigeration cycle.
  • the fan 39 In the outdoor unit 201, the fan 39 generates an air flow by rotation. By generating an air flow, the outdoor unit 201 sends air into the housing of the outdoor unit 201, and sends the air sent into the housing to the outside of the housing.
  • the outdoor heat exchanger 33 causes heat exchange between the air passing through the outdoor heat exchanger 33 and the refrigerant. In FIG. 5, the housing of the outdoor unit 201 is not shown.
  • the indoor unit 202 is connected to the output terminal 22 shown in FIG.
  • the indoor unit 202 operates by receiving power supply from the power conversion device 100.
  • the fan 40 generates an air flow by rotation.
  • the indoor unit 202 sends air into the housing of the indoor unit 202 and sends the air sent into the housing to the outside of the housing.
  • the indoor heat exchanger 35 exchanges heat between the air passing through the indoor heat exchanger 35 and the refrigerant.
  • the housing of the indoor unit 202 is not shown.
  • the power conversion device 100 may output a three-phase AC voltage to a motor that rotates the fan 39 or a motor that rotates the fan 40.
  • the air conditioner 200 has an effect that noise can be reduced by having a small number of ground wires 21 by having the power conversion device 100 according to the first or second embodiment.
  • the power conversion device 100 may be provided in a device other than the air conditioner 200 as long as it is provided in a device connected to the commercial AC power supply 1.
  • the configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

Abstract

A power conversion device (100) is provided with: a converter (4) and an inverter (5); a common mode choke coil (2) connected between the converter (4) and a commercial AC power source (1) that is an AC power source; Y capacitors (7a, 7b, 8a, 8b), which are AC-side interphase capacitors connected between power lines that connect the AC power source and the converter (4); and Y capacitors (9a, 9b), which are DC-side interphase capacitors connected between power lines that connect the converter (4) and the inverter (5). A shared grounding line (21) is used as the respective grounds of the AC-side interphase capacitors and the DC-side interphase capacitors. Ferrite beads (12, 13, 14), which are electronic parts having an inductance component, are respectively provided to wiring between the AC-side interphase capacitors and the grounding line (21), and to wiring between the DC-side interphase capacitors and the grounding line (21).

Description

電力変換装置および空気調和機Power converter and air conditioner
　本発明は、電力変換を行う電力変換装置および空気調和機に関する。 The present invention relates to a power converter and an air conditioner that perform power conversion.
　従来、コモンモードチョークコイルを有する電力変換装置が知られている。電力変換装置の配線パターンとアースとの間における浮遊容量の存在によって電力変換装置の配線パターンに共通に流れるコモンモード電流には、電力変換装置が有するインバータのスイッチング動作に起因するノイズなどが入り込むことがある。かかるノイズは、当該電力変換装置と他の装置とが共通の電源を使用する場合において、当該他の装置へ伝導することもある。コモンモードチョークコイルは、コモンモード電流による伝導ノイズであるコモンモードノイズを除去する。 Conventionally, a power conversion device having a common mode choke coil is known. Noise caused by the switching operation of the inverter of the power converter is included in the common mode current that flows in common to the wiring pattern of the power converter due to the presence of floating capacitance between the wiring pattern of the power converter and the ground. There is. Such noise may be conducted to the other device when the power conversion device and the other device use a common power source. The common mode choke coil removes common mode noise, which is conduction noise due to the common mode current.
　特許文献１には、コモンモードチョークコイルと交流側相間コンデンサと直流側相間コンデンサとを有する電力変換装置が開示されている。交流側相間コンデンサは、電力変換装置が有するコンバータの交流側におけるコモンモードノイズを除去する。直流側相間コンデンサは、コンバータの直流側におけるコモンモードノイズを除去する。特許文献１に開示される従来の電力変換装置では、交流側相間コンデンサと直流側相間コンデンサとは、リード線を用いてアースに接続される。リード線は、電力変換装置の筐体あるいは電力変換装置が搭載される機器の筐体といった、アースと同電位の構造物に接続される。電力変換装置は、交流側相間コンデンサおよび直流側相間コンデンサからリード線を介してアースへコモンモードノイズを伝達させることによって、電力変換装置が有する配線パターンからコモンモードノイズを除去する。交流側相間コンデンサおよび直流側相間コンデンサの各々とアースとがリード線を用いて個別に接続されることによって、リード線が有するインダクタンス成分が有効に作用して、交流側相間コンデンサおよび直流側相間コンデンサの間におけるノイズの伝導が防止される。 Patent Document 1 discloses a power conversion device having a common mode choke coil, an AC side phase capacitor, and a DC side phase capacitor. The AC side interphase capacitor removes common mode noise on the AC side of the converter of the power converter. The DC side interphase capacitor removes common mode noise on the DC side of the converter. In the conventional power conversion device disclosed in Patent Document 1, the AC side-phase capacitor and the DC side-phase capacitor are connected to the ground by using a lead wire. The lead wire is connected to a structure having the same potential as the ground, such as the housing of the power conversion device or the housing of the device on which the power conversion device is mounted. The power conversion device removes the common mode noise from the wiring pattern of the power conversion device by transmitting the common mode noise from the AC side phase capacitor and the DC side phase capacitor to the ground via the lead wire. By connecting each of the AC side phase capacitor and the DC side phase capacitor and the ground individually using the lead wire, the inductance component of the lead wire works effectively, and the AC side phase capacitor and the DC side phase capacitor The conduction of noise between them is prevented.
特開２０１０－２８８３８１号公報Japanese Unexamined Patent Publication No. 2010-288381
　上記従来の電力変換装置では、電力変換装置に搭載される交流側相間コンデンサと直流側相間コンデンサとの数が多くなるほど、リード線の数が多くなる。リード線の数が多くなるほど、電力変換装置の製造に必要となる部品の数が多くなるとともにリード線を設置するための作業工程が多くなることによって、電力変換装置の製造コストが増加する。電力変換装置が搭載される機器では、多くのリード線が引き回されることによって、ノイズが伝達する態様が複雑化することになる。このため、当該機器におけるノイズの低減を図る場合に、ノイズの発生源の特定とノイズの伝達経路の特定とが困難となる。 In the above-mentioned conventional power conversion device, the number of lead wires increases as the number of AC side-phase capacitors and DC side-phase capacitors mounted on the power conversion device increases. As the number of lead wires increases, the number of parts required for manufacturing the power converter increases and the number of work steps for installing the lead wires increases, so that the manufacturing cost of the power converter increases. In a device equipped with a power conversion device, many lead wires are routed, which complicates the mode in which noise is transmitted. Therefore, when trying to reduce noise in the device, it becomes difficult to identify the noise source and the noise transmission path.
　交流側相間コンデンサと直流側相間コンデンサとの各々とアースとを、リード線を用いた個別の接続に代えて配線パターンによって接続することとした場合、交流側相間コンデンサと直流側相間コンデンサとが接続された部位に適切なインピーダンスが無いことから、交流側のノイズと直流側のノイズとが配線パターンにおいて干渉し合う。電力変換装置は、交流側のノイズと直流側のノイズとが干渉し合うことによって、さらにノイズが増加することになる。このように、上記従来の電力変換装置では、少ない接地線によりノイズを低減することが困難であるという問題があった。 When each of the AC side phase capacitor, the DC side phase capacitor, and the ground are connected by a wiring pattern instead of individual connection using lead wires, the AC side phase capacitor and the DC side phase capacitor are connected. Since there is no appropriate impedance in the damaged part, the noise on the AC side and the noise on the DC side interfere with each other in the wiring pattern. In the power conversion device, the noise on the AC side and the noise on the DC side interfere with each other, so that the noise is further increased. As described above, the conventional power conversion device has a problem that it is difficult to reduce noise with a small number of ground wires.
　本発明は、上記に鑑みてなされたものであって、少ない接地線によってノイズを低減可能とする電力変換装置を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to obtain a power conversion device capable of reducing noise with a small number of ground wires.
　上述した課題を解決し、目的を達成するために、本発明に係る電力変換装置は、交流電源と負荷との間に接続されたコンバータおよびインバータと、交流電源とコンバータとの間に接続されたコモンモードチョークコイルと、交流電源とコンバータとを接続する電源ライン同士の間に接続された交流側相間コンデンサと、コンバータとインバータとを接続する電源ライン同士の間に接続された直流側相間コンデンサと、を備える。交流側相間コンデンサおよび直流側相間コンデンサの各々の接地には、共通の接地線が用いられている。交流側相間コンデンサおよび接地線の間の配線と、直流側相間コンデンサおよび接地線の間の配線との各々に、インダクタンス成分を持つ電子部品が設けられている。 In order to solve the above-mentioned problems and achieve the object, the power conversion device according to the present invention is connected between the converter and the inverter connected between the AC power supply and the load, and between the AC power supply and the converter. A common mode choke coil, an AC side-phase capacitor connected between the power lines connecting the AC power supply and the converter, and a DC side-phase capacitor connected between the power supply lines connecting the converter and the inverter. , Equipped with. A common ground wire is used for grounding each of the AC side phase capacitor and the DC side phase capacitor. An electronic component having an inductance component is provided in each of the wiring between the AC side phase capacitor and the ground wire and the wiring between the DC side phase capacitor and the ground wire.
　本発明に係る電力変換装置は、少ない接地線によってノイズを低減することができるという効果を奏する。 The power conversion device according to the present invention has an effect that noise can be reduced with a small number of ground wires.
本発明の実施の形態１にかかる電力変換装置の構成例を示す図The figure which shows the structural example of the power conversion apparatus which concerns on Embodiment 1 of this invention. 図１に示す電力変換装置が有する交流側相間コンデンサと直流側相間コンデンサとの実装の態様を模式的に示す図The figure which shows typically the mode of mounting of the AC side phase capacitor and the DC side phase capacitor which the power conversion apparatus shown in FIG. 1 has. 本発明の実施の形態２にかかる電力変換装置の概略構成を示す図The figure which shows the schematic structure of the power conversion apparatus which concerns on Embodiment 2 of this invention. 図３に示す電力変換装置と電力変換装置の接地に用いられる筐体とを示す図The figure which shows the power conversion device shown in FIG. 3 and the housing used for grounding the power conversion device. 本発明の実施の形態３にかかる空気調和機の概略構成を示す図The figure which shows the schematic structure of the air conditioner which concerns on Embodiment 3 of this invention.
　以下に、本発明の実施の形態にかかる電力変換装置および空気調和機を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 The power conversion device and the air conditioner according to the embodiment of the present invention will be described in detail below with reference to the drawings. The present invention is not limited to this embodiment.
実施の形態１．
　図１は、本発明の実施の形態１にかかる電力変換装置の構成例を示す図である。電力変換装置１００は、商用交流電源１と負荷２０との間に接続されたコンバータ４およびインバータ５を有する。負荷２０の例は、空気調和機の室外機に備えられた圧縮機を駆動するモータである。モータには、室外機に搭載された電力変換装置１００によって電力が供給される。 Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a power conversion device according to a first embodiment of the present invention. The power conversion device 100 includes a converter 4 and an inverter 5 connected between the commercial AC power supply 1 and the load 20. An example of the load 20 is a motor for driving a compressor provided in an outdoor unit of an air conditioner. Electric power is supplied to the motor by the electric power converter 100 mounted on the outdoor unit.
　商用交流電源１は、単相交流電圧を電力変換装置１００へ出力する。コンバータ４は、整流作用によって交流電圧を直流電圧へ変換する。インバータ５は、コンバータ４により出力された直流電圧を３相交流電圧へ変換する。電力変換装置１００は、インバータ５により出力された交流電圧を負荷２０へ印加する。コンバータ４の入力端子の各々は、電源ラインを介して商用交流電源１に接続されている。コンバータ４の出力端子の各々は、電源ラインを介してインバータ５の入力端子に接続されている。なお、以下の説明において、商用交流電源１とコンバータ４とを接続する電源ラインを交流ライン、コンバータ４とインバータ５との間の電源ラインを直流ラインと称することがある。 The commercial AC power supply 1 outputs a single-phase AC voltage to the power converter 100. The converter 4 converts an AC voltage into a DC voltage by a rectifying action. The inverter 5 converts the DC voltage output by the converter 4 into a three-phase AC voltage. The power conversion device 100 applies the AC voltage output by the inverter 5 to the load 20. Each of the input terminals of the converter 4 is connected to the commercial AC power supply 1 via a power supply line. Each of the output terminals of the converter 4 is connected to the input terminal of the inverter 5 via a power supply line. In the following description, the power supply line connecting the commercial AC power supply 1 and the converter 4 may be referred to as an AC line, and the power supply line between the converter 4 and the inverter 5 may be referred to as a DC line.
　電力変換装置１００は、コンバータ４に並列に接続されている平滑コンデンサ１１を有する。平滑コンデンサ１１は、コンバータ４のインバータ５側において、直流ライン同士の間に接続されている。平滑コンデンサ１１は、コンバータ４により出力された直流電圧を平滑化する。インバータ５には、平滑コンデンサ１１によって平滑化された直流電圧が印加される。 The power conversion device 100 has a smoothing capacitor 11 connected in parallel to the converter 4. The smoothing capacitor 11 is connected between the DC lines on the inverter 5 side of the converter 4. The smoothing capacitor 11 smoothes the DC voltage output by the converter 4. A DC voltage smoothed by the smoothing capacitor 11 is applied to the inverter 5.
　電力変換装置１００は、商用交流電源１とコンバータ４との間に接続されたコモンモードチョークコイル２と、交流側線間コンデンサであるＸコンデンサ６と、交流側相間コンデンサであるＹコンデンサ７ａ，７ｂ，８ａ，８ｂと、直流側相間コンデンサであるＹコンデンサ９ａ，９ｂとを有する。コモンモードチョークコイル２とＸコンデンサ６とＹコンデンサ７ａ，７ｂ，８ａ，８ｂとは、交流ラインにおけるノイズを除去するフィルタ回路として機能する。Ｙコンデンサ９ａ，９ｂは、直流ラインにおけるノイズを除去するフィルタ回路として機能する。 The power conversion device 100 includes a common mode choke coil 2 connected between the commercial AC power supply 1 and the converter 4, an X capacitor 6 which is an AC side line capacitor, and Y capacitors 7a and 7b which are AC side phase capacitors. It has 8a and 8b and Y capacitors 9a and 9b which are DC side phase capacitors. The common mode choke coil 2, the X capacitor 6, and the Y capacitors 7a, 7b, 8a, and 8b function as a filter circuit for removing noise in the AC line. The Y capacitors 9a and 9b function as a filter circuit for removing noise in the DC line.
　Ｘコンデンサ６は、コモンモードチョークコイル２の商用交流電源１側において、交流ライン同士の間に接続されている。Ｙコンデンサ７ａとＹコンデンサ７ｂとは、交流ラインのうちＸコンデンサ６が接続されている位置よりもコモンモードチョークコイル２側において、交流ライン同士の間に接続されている。Ｙコンデンサ７ａとＹコンデンサ７ｂとは、接続点１６を介して互いに直列に接続されている。 The X capacitor 6 is connected between AC lines on the commercial AC power supply 1 side of the common mode choke coil 2. The Y capacitor 7a and the Y capacitor 7b are connected between the AC lines on the common mode choke coil 2 side of the AC line from the position where the X capacitor 6 is connected. The Y capacitor 7a and the Y capacitor 7b are connected in series with each other via the connection point 16.
　Ｙコンデンサ８ａとＹコンデンサ８ｂとは、コモンモードチョークコイル２のコンバータ４側において、交流ライン同士の間に接続されている。Ｙコンデンサ８ａとＹコンデンサ８ｂとは、接続点１７を介して互いに直列に接続されている。 The Y capacitor 8a and the Y capacitor 8b are connected between the AC lines on the converter 4 side of the common mode choke coil 2. The Y capacitor 8a and the Y capacitor 8b are connected in series with each other via a connection point 17.
　Ｙコンデンサ９ａとＹコンデンサ９ｂとは、直流ラインのうち平滑コンデンサ１１が接続されている位置よりもインバータ５側において、直流ライン同士の間に接続されている。Ｙコンデンサ９ａとＹコンデンサ９ｂとは、接続点１８を介して互いに直列に接続されている。 The Y capacitor 9a and the Y capacitor 9b are connected between the DC lines on the inverter 5 side of the DC line from the position where the smoothing capacitor 11 is connected. The Y capacitor 9a and the Y capacitor 9b are connected in series with each other via a connection point 18.
　電力変換装置１００は、単相交流電圧を出力するための出力端子２２を有する。出力端子２２の各々は、商用交流電源１とコンバータ４とを接続する交流ラインから分岐された分岐ラインの端に位置する。例を挙げると、出力端子２２には、空気調和機が有する室内機が接続される。 The power conversion device 100 has an output terminal 22 for outputting a single-phase AC voltage. Each of the output terminals 22 is located at the end of a branch line branched from the AC line connecting the commercial AC power supply 1 and the converter 4. For example, an indoor unit included in the air conditioner is connected to the output terminal 22.
　電力変換装置１００は、商用交流電源１と出力端子２２との間に接続されたコモンモードチョークコイル３と、交流側相間コンデンサであるＹコンデンサ１０ａ，１０ｂとを有する。コモンモードチョークコイル３とＹコンデンサ１０ａ，１０ｂとは、分岐ラインにおけるノイズを除去するフィルタ回路として機能する。 The power conversion device 100 has a common mode choke coil 3 connected between the commercial AC power supply 1 and the output terminal 22, and Y capacitors 10a and 10b which are AC side phase capacitors. The common mode choke coil 3 and the Y capacitors 10a and 10b function as a filter circuit for removing noise in the branch line.
　Ｙコンデンサ１０ａとＹコンデンサ１０ｂとは、分岐ラインのうちコモンモードチョークコイル３の出力端子２２側において、分岐ライン同士の間に接続されている。Ｙコンデンサ１０ａとＹコンデンサ１０ｂとは、接続点１９を介して互いに直列に接続されている。 The Y capacitor 10a and the Y capacitor 10b are connected between the branch lines on the output terminal 22 side of the common mode choke coil 3 among the branch lines. The Y capacitor 10a and the Y capacitor 10b are connected in series with each other via a connection point 19.
　接続点１６から引き出されている配線と、接続点１７から引き出されている配線と、接続点１８から引き出されている配線と、接続点１９から引き出されている配線とは、１つの接地線２１に接続されている。各配線は、接地線２１を介してアースに接続されている。これにより、Ｙコンデンサ７ａ，７ｂ，８ａ，８ｂ，９ａ，９ｂ，１０ａ，１０ｂの各々の接地には、共通の接地線２１が用いられている。例を挙げると、接地線２１は、電力変換装置１００の筐体、あるいは室外機の筐体に接続される。このように、電力変換装置１００は、接地線２１を用いることによって、Ｙコンデンサ７ａ，７ｂとＹコンデンサ８ａ，８ｂとＹコンデンサ９ａ，９ｂとＹコンデンサ１０ａ，１０ｂとの各構成の接地を一括して行う。 The wiring drawn out from the connection point 16, the wiring drawn out from the connection point 17, the wiring drawn out from the connection point 18, and the wiring drawn out from the connection point 19 are one ground wire 21. It is connected to the. Each wiring is connected to the ground via the ground wire 21. As a result, a common ground wire 21 is used for grounding each of the Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b. For example, the ground wire 21 is connected to the housing of the power conversion device 100 or the housing of the outdoor unit. In this way, the power conversion device 100 collectively grounds the Y capacitors 7a, 7b, the Y capacitors 8a, 8b, the Y capacitors 9a, 9b, and the Y capacitors 10a, 10b by using the ground wire 21. To do.
　電力変換装置１００は、インダクタンス成分を持つ電子部品であるフェライトビーズ１２，１３，１４，１５を有する。フェライトビーズ１２は、接続点１６と接地線２１との間の配線に設けられている。フェライトビーズ１３は、接続点１７と接地線２１との間の配線に設けられている。フェライトビーズ１４は、接続点１８と接地線２１との間の配線に設けられている。フェライトビーズ１５は、接続点１９と接地線２１との間の配線に設けられている。フェライトビーズ１２，１３，１４，１５は、高周波領域における電流のエネルギーをインダクタンス成分によって損失させる。フェライトビーズ１２，１３，１４，１５は、電流のエネルギーを損失させることによってノイズを吸収する。 The power conversion device 100 has ferrite beads 12, 13, 14, and 15 which are electronic components having an inductance component. The ferrite beads 12 are provided in the wiring between the connection point 16 and the ground wire 21. The ferrite beads 13 are provided in the wiring between the connection point 17 and the ground wire 21. The ferrite beads 14 are provided in the wiring between the connection point 18 and the ground wire 21. The ferrite beads 15 are provided in the wiring between the connection point 19 and the ground wire 21. The ferrite beads 12, 13, 14 and 15 cause the energy of the current in the high frequency region to be lost due to the inductance component. The ferrite beads 12, 13, 14, 15 absorb noise by losing the energy of the electric current.
　このように、Ｙコンデンサ７ａ，７ｂおよび接地線２１の間の配線にはフェライトビーズ１２が設けられている。Ｙコンデンサ８ａ，８ｂおよび接地線２１の間の配線にはフェライトビーズ１３が設けられている。Ｙコンデンサ９ａ，９ｂおよび接地線２１の間の配線にはフェライトビーズ１４が設けられている。Ｙコンデンサ１０ａ，１０ｂおよび接地線２１の間の配線にはフェライトビーズ１５が設けられている。すなわち、交流側相間コンデンサおよび接地線２１の間の配線と、直流側相間コンデンサおよび接地線２１の間の配線との各々に、インダクタンス成分を持つ電子部品が設けられている。 As described above, ferrite beads 12 are provided in the wiring between the Y capacitors 7a and 7b and the ground wire 21. Ferrite beads 13 are provided in the wiring between the Y capacitors 8a and 8b and the ground wire 21. Ferrite beads 14 are provided in the wiring between the Y capacitors 9a and 9b and the ground wire 21. Ferrite beads 15 are provided in the wiring between the Y capacitors 10a and 10b and the ground wire 21. That is, electronic components having an inductance component are provided in each of the wiring between the AC side phase capacitor and the ground wire 21 and the wiring between the DC side phase capacitor and the ground wire 21.
　図２は、図１に示す電力変換装置が有する交流側相間コンデンサと直流側相間コンデンサとの実装の態様を模式的に示す図である。Ｙコンデンサ７ａ，７ｂ，８ａ，８ｂ，９ａ，９ｂ，１０ａ，１０ｂは、電子回路基板２５に実装されている。電子回路基板２５は、電力変換装置１００の電子回路が実装された基板である。電子回路の内部には、図１に示すコンバータ４とインバータ５との動作の状態にしたがって、さまざまな周波数のノイズが充満する。 FIG. 2 is a diagram schematically showing an embodiment of mounting of an AC side-phase capacitor and a DC side-phase capacitor included in the power conversion device shown in FIG. 1. The Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b are mounted on the electronic circuit board 25. The electronic circuit board 25 is a board on which the electronic circuit of the power conversion device 100 is mounted. The inside of the electronic circuit is filled with noise of various frequencies according to the operating state of the converter 4 and the inverter 5 shown in FIG.
　配線２３は、電子回路基板２５が有する入力端子と商用交流電源１とを接続する。配線２４は、電子回路基板２５が有する出力端子と負荷２０とを接続する。図２では、電子回路基板２５に設けられている構成要素を電子回路基板２５の上方から見た様子を示している。なお、図２では、電子回路基板２５に実装されている構成要素のうち説明のために必要な構成要素のみを示すこととし、その他の構成要素についての図示を省略する。 The wiring 23 connects the input terminal of the electronic circuit board 25 to the commercial AC power supply 1. The wiring 24 connects the output terminal of the electronic circuit board 25 and the load 20. FIG. 2 shows a state in which the components provided on the electronic circuit board 25 are viewed from above the electronic circuit board 25. Note that, in FIG. 2, only the components necessary for explanation among the components mounted on the electronic circuit board 25 are shown, and the illustration of other components is omitted.
　Ｙコンデンサ７ａ，７ｂ，８ａ，８ｂ，９ａ，９ｂ，１０ａ，１０ｂと接地線２１とは、電子回路基板２５上の配線パターンを介して接続されている。これにより、電力変換装置１００は、共通の接地線２１を用いて、交流側相間コンデンサおよび直流側相間コンデンサの各々の接地を一括して行うことができる。 The Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b and the ground wire 21 are connected to each other via a wiring pattern on the electronic circuit board 25. As a result, the power conversion device 100 can collectively ground each of the AC side-phase capacitor and the DC side-phase capacitor by using the common grounding wire 21.
　仮に、交流側相間コンデンサおよび直流側相間コンデンサの各々が一括して接地される構成に代えて、Ｙコンデンサ７ａ，７ｂとＹコンデンサ８ａ，８ｂとＹコンデンサ９ａ，９ｂとＹコンデンサ１０ａ，１０ｂとの各構成が互いに独立して接地される場合には、接地のためのリード線が各構成に設けられることになる。電力変換装置１００には、従来技術の場合と同様に、接続点１６とアースとを接続するリード線と、接続点１７とアースとを接続するリード線と、接続点１８とアースとを接続するリード線と、接続点１９とアースとを接続するリード線とが設けられる。 Assuming that the AC side-phase capacitor and the DC side-phase capacitor are all grounded together, the Y capacitors 7a, 7b, the Y capacitors 8a, 8b, the Y capacitors 9a, 9b, and the Y capacitors 10a, 10b If the configurations are grounded independently of each other, a lead wire for grounding will be provided in each configuration. The power converter 100 is connected to the lead wire connecting the connection point 16 and the ground, the lead wire connecting the connection point 17 and the ground, and the connection point 18 and the ground, as in the case of the prior art. A lead wire and a lead wire connecting the connection point 19 and the ground are provided.
　実施の形態１にかかる電力変換装置１００は、接地線２１によって各構成を一括して接地させることによって、構成ごとのリード線が不要となる。電力変換装置１００は、各構成が互いに独立して接地される場合と比較して、電力変換装置１００の製造に必要となる部品の数を少なくすることができる。また、電力変換装置１００の製造において、構成ごとのリード線の設置のための作業工程が不要となる。これにより、電力変換装置１００は、各構成が互いに独立して接地される場合と比較して、製造コストを抑えることができる。 The power conversion device 100 according to the first embodiment eliminates the need for lead wires for each configuration by collectively grounding each configuration by the ground wire 21. The power conversion device 100 can reduce the number of parts required for manufacturing the power conversion device 100 as compared with the case where each configuration is grounded independently of each other. Further, in the manufacture of the power conversion device 100, a work process for installing lead wires for each configuration becomes unnecessary. As a result, the power conversion device 100 can reduce the manufacturing cost as compared with the case where each configuration is grounded independently of each other.
　フェライトビーズ１２，１３，１４，１５は、Ｙコンデンサ７ａ，７ｂ，８ａ，８ｂ，９ａ，９ｂ，１０ａ，１０ｂと接地線２１とを接続する配線パターン上に設けられている。インダクタンス成分を持つフェライトビーズ１２，１３，１４，１５が配線パターン上に設けられることによって、電力変換装置１００は、配線パターンにおける交流側のノイズと直流側のノイズとの干渉を抑えることができる。これにより、電力変換装置１００は、交流側のノイズと直流側のノイズとの干渉によるノイズの増加を防止することができ、ノイズ低減効果を高めることができる。 Ferrite beads 12, 13, 14, and 15 are provided on a wiring pattern that connects the Y capacitors 7a, 7b, 8a, 8b, 9a, 9b, 10a, and 10b and the ground wire 21. By providing the ferrite beads 12, 13, 14, and 15 having an inductance component on the wiring pattern, the power conversion device 100 can suppress interference between noise on the AC side and noise on the DC side in the wiring pattern. As a result, the power conversion device 100 can prevent an increase in noise due to interference between noise on the AC side and noise on the DC side, and can enhance the noise reduction effect.
　各構成が互いに独立して接地される場合において用いられる上記のリード線は、通常、１０ｃｍから２０ｃｍの長さを有する。また、一般的なリード線は、１ｎＨ／ｃｍのインダクタンスを有する。実施の形態１にかかる電力変換装置１００では、各構成と接地線２１との間の各配線に設けられたフェライトビーズ１２，１３，１４，１５によって、リード線と同等のインダクタンスを各配線に持たせている。これにより、電力変換装置１００は、各構成が互いに独立して接地される場合と同様にノイズを除去することができる。 The lead wires used when the configurations are grounded independently of each other usually have a length of 10 cm to 20 cm. Further, a general lead wire has an inductance of 1 nH / cm. In the power conversion device 100 according to the first embodiment, each wiring has an inductance equivalent to that of a lead wire by means of ferrite beads 12, 13, 14, 15 provided in each wiring between each configuration and the ground wire 21. I'm letting you. As a result, the power converter 100 can remove noise in the same manner as when the configurations are grounded independently of each other.
　なお、電力変換装置１００に設けられる接地線２１の数は１つに限られず、複数であっても良い。電力変換装置１００は、交流側相間コンデンサおよび直流側相間コンデンサである複数の相間コンデンサのうちの少なくとも一部について一括して接地させることによって、複数の相間コンデンサの各々を互いに独立して接地させる場合に比べて接地線２１の数を少なくすることができる。 The number of ground wires 21 provided in the power conversion device 100 is not limited to one, and may be plural. When the power conversion device 100 grounds at least a part of a plurality of interphase capacitors, which are an AC side-phase capacitor and a DC-side phase capacitor, at once, so that each of the plurality of phase capacitors is grounded independently of each other. The number of ground wires 21 can be reduced as compared with the above.
　空気調和機に搭載される電力変換装置１００の場合、電力変換装置１００の電子回路構成は、空気調和機において必要とされる性能によって変えられる。電子回路構成が変わると、電子回路において発生するノイズの周波数ならびに強さも変化する。電力変換装置１００には、電子回路において発生するノイズに合わせた特性を有するフェライトビーズ１２，１３，１４，１５が設けられる。各フェライトビーズ１２，１３，１４，１５のインダクタンス値には、ノイズの周波数に合わせて最適な値を設定することができる。これにより、電力変換装置１００は、より高いノイズ低減効果を得ることができる。 In the case of the power converter 100 mounted on the air conditioner, the electronic circuit configuration of the power converter 100 can be changed according to the performance required in the air conditioner. When the electronic circuit configuration changes, the frequency and intensity of noise generated in the electronic circuit also change. The power conversion device 100 is provided with ferrite beads 12, 13, 14, and 15 having characteristics that match the noise generated in the electronic circuit. The inductance values of the ferrite beads 12, 13, 14, and 15 can be set to optimum values according to the noise frequency. As a result, the power converter 100 can obtain a higher noise reduction effect.
　各フェライトビーズ１２，１３，１４，１５の特性は、互いに同じであっても良い。また、フェライトビーズ１２，１３，１４，１５の中の少なくとも１つは、その他とは異なる特性を有していても良い。各フェライトビーズ１２，１３，１４，１５の特性は、電子回路の構成に合わせて決定することができる。すなわち、各フェライトビーズ１２，１３，１４，１５のインダクタンス値は、電子回路の構成に合わせて適宜決定できる。 The characteristics of the ferrite beads 12, 13, 14, and 15 may be the same as each other. Further, at least one of the ferrite beads 12, 13, 14 and 15 may have different characteristics from the others. The characteristics of the ferrite beads 12, 13, 14 and 15 can be determined according to the configuration of the electronic circuit. That is, the inductance values of the ferrite beads 12, 13, 14, and 15 can be appropriately determined according to the configuration of the electronic circuit.
　交流側相間コンデンサに設けられるフェライトビーズ１２，１３，１５のインダクタンス値と直流側相間コンデンサに設けられるフェライトビーズ１４のインダクタンス値とを互いに異なる値とすることによって、交流側のノイズと直流側のノイズとの干渉を抑えることが可能となる。例を挙げると、フェライトビーズ１２，１３，１５のインダクタンス値は２０ｎＨ、フェライトビーズ１４のインダクタンス値は１０ｎＨとされる。 By setting the inductance values of the ferrite beads 12, 13 and 15 provided on the AC side interphase capacitor and the inductance values of the ferrite beads 14 provided on the DC side interphase capacitor to different values, the noise on the AC side and the noise on the DC side It is possible to suppress interference with. For example, the inductance values of the ferrite beads 12, 13 and 15 are 20 nH, and the inductance values of the ferrite beads 14 are 10 nH.
　各フェライトビーズ１２，１３，１４，１５のインダクタンス値は、他の構成要素へ伝導し得るノイズの発生を抑えることと、他の構成要素からのノイズの伝導を防ぐこととのどちらに重点をおくかによって決定することができる。各フェライトビーズ１２，１３，１４，１５のインダクタンス値を適宜決定することによって、ノイズ発生を低減させたい回路と他の回路からのノイズの伝導を防ぎたい回路との分類が実現可能となる。例を挙げると、各フェライトビーズ１２，１３，１４，１５のインダクタンス値は、１ｎＨから１００ｎＨの範囲において設定することができる。 The inductance values of the ferrite beads 12, 13, 14, and 15 focus on either suppressing the generation of noise that can be conducted to other components or preventing the conduction of noise from other components. Can be determined by By appropriately determining the inductance values of the ferrite beads 12, 13, 14, and 15, it is possible to classify a circuit in which noise generation is desired to be reduced and a circuit in which noise transmission from other circuits is desired to be prevented. For example, the inductance values of the ferrite beads 12, 13, 14, and 15 can be set in the range of 1 nH to 100 nH.
　なお、電力変換装置１００は、フェライトビーズ１２，１３，１４，１５以外の、インダクタンス成分を持つ電子部品を有しても良い。インダクタンス成分を持つ電子部品には、ノーマルモードチョークコイルといった、フェライトビーズ１２，１３，１４，１５と同等のインダクタンス成分を持つ電子部品を用いることができる。フェライトビーズ１２，１３，１４，１５またはノーマルモードチョークコイルは、コモンモードチョークコイル２，３よりも小型である。このため、かかる電子部品にコモンモードチョークコイル２，３と同様のコモンモードチョークコイルが用いられる場合に比べて、電力変換装置１００は、電子回路の大型化を抑制することができる。 The power conversion device 100 may include electronic components having an inductance component other than the ferrite beads 12, 13, 14, and 15. As the electronic component having an inductance component, an electronic component having an inductance component equivalent to that of the ferrite beads 12, 13, 14 and 15 such as a normal mode choke coil can be used. The ferrite beads 12, 13, 14, 15 or the normal mode choke coil is smaller than the common mode choke coils 2 and 3. Therefore, the power conversion device 100 can suppress the enlargement of the electronic circuit as compared with the case where the common mode choke coil similar to the common mode choke coils 2 and 3 is used for the electronic component.
　実施の形態１によると、電力変換装置１００は、交流側相間コンデンサおよび直流側相間コンデンサの各々の接地に共通の接地線２１が用いられることによって、接地線２１の数を少なくすることができる。また、電力変換装置１００は、交流側相間コンデンサおよび接地線２１の間の配線と、直流側相間コンデンサおよび接地線２１の間の配線との各々に、インダクタンス成分を持つ電子部品が設けられることによって、ノイズの効果的な低減が可能となる。以上により、電力変換装置１００は、少ない接地線２１によってノイズを低減することができるという効果を奏する。 According to the first embodiment, the power conversion device 100 can reduce the number of ground wires 21 by using a common ground wire 21 for grounding each of the AC side phase capacitor and the DC side phase capacitor. Further, in the power conversion device 100, electronic components having an inductance component are provided in each of the wiring between the AC side phase capacitor and the ground wire 21 and the wiring between the DC side phase capacitor and the ground wire 21. , Noise can be effectively reduced. As described above, the power conversion device 100 has an effect that noise can be reduced by using a small number of ground wires 21.
実施の形態２．
　図３は、本発明の実施の形態２にかかる電力変換装置の概略構成を示す図である。図４は、図３に示す電力変換装置と電力変換装置の接地に用いられる筐体とを示す図である。実施の形態２では、電力変換装置１００の接地に用いられる筐体の例について説明する。実施の形態２では、上記の実施の形態１と同一の構成要素には同一の符号を付し、実施の形態１とは異なる構成について主に説明する。 Embodiment 2.
FIG. 3 is a diagram showing a schematic configuration of a power conversion device according to a second embodiment of the present invention. FIG. 4 is a diagram showing the power conversion device shown in FIG. 3 and a housing used for grounding the power conversion device. In the second embodiment, an example of a housing used for grounding the power conversion device 100 will be described. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the configurations different from those in the first embodiment will be mainly described.
　筐体２６は、図１に示す電力変換装置１００内の構成要素を囲う。壁部２７は、筐体２６の内部に取り付けられており、筐体２６内部の空間を仕切る。筐体２６と壁部２７とは、板金を用いて形成されている。筐体２６と壁部２７とは、ノイズの伝導を遮断するシールド部を構成する。 The housing 26 encloses the components in the power conversion device 100 shown in FIG. The wall portion 27 is attached to the inside of the housing 26 and partitions the space inside the housing 26. The housing 26 and the wall portion 27 are formed by using sheet metal. The housing 26 and the wall portion 27 form a shield portion that blocks the conduction of noise.
　配線２４は、電子回路基板２５が有する出力端子と負荷２０とを接続する。配線２３は、電子回路基板２５が有する入力端子と商用交流電源１とを接続する。なお、図３に示す構成は、図２に示す構成に、壁部２７と配線２８とが追加されたものである。図４には、筐体２６に設けられている構成要素を側方から見た様子を示している。接地線２１は、筐体２６に接続されている。 The wiring 24 connects the output terminal of the electronic circuit board 25 and the load 20. The wiring 23 connects the input terminal of the electronic circuit board 25 to the commercial AC power supply 1. The configuration shown in FIG. 3 is the configuration in which the wall portion 27 and the wiring 28 are added to the configuration shown in FIG. FIG. 4 shows a side view of the components provided in the housing 26. The ground wire 21 is connected to the housing 26.
　配線２８は、電力変換装置１００と電力変換装置１００の外部の装置とを接続するための配線であって、配線２３，２４および接地線２１以外の通信線および信号線といった配線全体を指すものとする。配線２８には、電力変換装置１００から室内機への電力供給のための配線と、電力変換装置１００の外部の制御システムとの通信のための通信線と、サーミスタへの電力供給のための配線と、四方弁への電力供給のための配線とが含まれる。サーミスタは、空気調和機の各部位における温度を計測する。四方弁は、空気調和機の冷房と暖房との運転の切り換えにしたがって冷媒回路を切り換える。 The wiring 28 is a wiring for connecting the power conversion device 100 and an external device of the power conversion device 100, and refers to the entire wiring such as communication lines and signal lines other than the wires 23 and 24 and the ground line 21. To do. The wiring 28 includes a wiring for supplying electric power from the power conversion device 100 to the indoor unit, a communication line for communicating with an external control system of the power conversion device 100, and a wiring for supplying electric power to the thermista. And wiring for supplying power to the four-way valve. The thermistor measures the temperature at each part of the air conditioner. The four-way valve switches the refrigerant circuit according to the switching of operation between cooling and heating of the air conditioner.
　ここで、接地線２１と配線２３とを第１の配線、配線２４と配線２８とを第２の配線とする。第１の配線は、電力変換装置１００に設けられている配線のうち、多くのノイズを発生させる配線である。第２の配線は、電力変換装置１００に設けられている配線のうち第１の配線以外の配線であって、第１の配線に比べて発生するノイズが少ない配線である。 Here, the ground wire 21 and the wiring 23 are the first wiring, and the wiring 24 and the wiring 28 are the second wiring. The first wiring is a wiring that generates a lot of noise among the wiring provided in the power conversion device 100. The second wiring is wiring other than the first wiring among the wirings provided in the power conversion device 100, and is a wiring that generates less noise than the first wiring.
　第１の配線は、筐体２６と壁部２７とによって囲われる領域に設けられている。第２の配線は、筐体２６と壁部２７とによって囲われる領域の外に設けられている。筐体２６と壁部２７とからなるシールド部は、第１の配線が設けられている領域を囲うことによって、第１の配線から第２の配線へのノイズの伝導を遮断する。電力変換装置１００は、シールド部が設けられることによって、第１の配線から放射されたノイズが第２の配線へ伝導することを抑制できる。これにより、電力変換装置１００は、第１の配線から第２の配線へノイズが伝導することによる誤作動といった不具合を防ぐことができる。また、各相間コンデンサの接地は、第１の配線が設けられている領域内においてシールド部へ接地線２１を接続させることによって容易に実現することができる。 The first wiring is provided in the area surrounded by the housing 26 and the wall portion 27. The second wiring is provided outside the area surrounded by the housing 26 and the wall portion 27. The shield portion including the housing 26 and the wall portion 27 blocks the conduction of noise from the first wiring to the second wiring by surrounding the area where the first wiring is provided. By providing the shield portion, the power conversion device 100 can suppress the noise radiated from the first wiring from being conducted to the second wiring. As a result, the power conversion device 100 can prevent problems such as malfunction due to noise conduction from the first wiring to the second wiring. Further, grounding of each interphase capacitor can be easily realized by connecting the grounding wire 21 to the shield portion in the region where the first wiring is provided.
　複数の相間コンデンサの接地を接地線２１によって一括化させたことによって、各相間コンデンサの各々に接地線２１が分散して設けられる場合に比べて、接地線２１が設けられる領域を容易に限定させることができる。これにより、電力変換装置１００は、ノイズの影響を受け易い配線から遠ざけて接地線２１を配置することが可能となる。さらに、電力変換装置１００は、第１の配線が設けられている領域をシールド部によって容易に囲うことが可能となる。 By unifying the grounding of a plurality of interphase capacitors by the grounding wire 21, the area where the grounding wire 21 is provided can be easily limited as compared with the case where the grounding wire 21 is distributed to each of the interphase capacitors. be able to. As a result, the power conversion device 100 can arrange the ground wire 21 away from the wiring that is easily affected by noise. Further, the power conversion device 100 can easily surround the area where the first wiring is provided by the shield portion.
　なお、図４に示す例では、壁部２７は電子回路基板２５にまで達しておらず、電子回路基板２５と壁部２７との間に隙間が設けられている。壁部２７は、電子回路基板２５に達していても良い。電子回路基板２５に設けられたスリットへ壁部２７が挿入されることによって、壁部２７が電子回路基板２５を貫いていても良い。これにより、シールド部は、ノイズの伝導を抑制させるシールド性を高めることができる。 In the example shown in FIG. 4, the wall portion 27 does not reach the electronic circuit board 25, and a gap is provided between the electronic circuit board 25 and the wall portion 27. The wall portion 27 may reach the electronic circuit board 25. By inserting the wall portion 27 into the slit provided in the electronic circuit board 25, the wall portion 27 may penetrate the electronic circuit board 25. As a result, the shield portion can enhance the shielding property that suppresses the conduction of noise.
　筐体２６と壁部２７とは、板金を用いて形成されたものに限られない。筐体２６と壁部２７とは、ノイズの伝導を抑制させる性質の材料からなるものであれば良い。シールド部の形状は、図４に示す筐体２６と壁部２７とによって構成される形状に限られず、自在に変更可能であるものとする。シールド部は、筐体２６と壁部２７とによって実現されるものに限られない。シールド部は、筐体２６および壁部２７以外の構成要素によって実現されても良い。シールド部は、図１に示す平滑コンデンサ１１に使用されるアルミ電解コンデンサによって実現されても良い。 The housing 26 and the wall portion 27 are not limited to those formed by using sheet metal. The housing 26 and the wall portion 27 may be made of a material having a property of suppressing noise conduction. The shape of the shield portion is not limited to the shape composed of the housing 26 and the wall portion 27 shown in FIG. 4, and can be freely changed. The shield portion is not limited to that realized by the housing 26 and the wall portion 27. The shield portion may be realized by components other than the housing 26 and the wall portion 27. The shield portion may be realized by the aluminum electrolytic capacitor used for the smoothing capacitor 11 shown in FIG.
　実施の形態２によると、電力変換装置１００は、シールド部が設けられることによって、第１の配線から第２の配線へのノイズの伝導を抑制することができる。これにより、電力変換装置１００は、ノイズをより低減することができるという効果を奏する。 According to the second embodiment, the power conversion device 100 can suppress the conduction of noise from the first wiring to the second wiring by providing the shield portion. As a result, the power converter 100 has the effect of being able to further reduce noise.
実施の形態３．
　図５は、本発明の実施の形態３にかかる空気調和機の概略構成を示す図である。空気調和機２００は、空気調和のための空気流を室内空間へ送り出すことによって、室内空間の温度と湿度とを調整する。空気調和機２００は、室内温度が目標温度となるように冷房、送風、除湿および暖房といった運転モードの切り換えを行う。 Embodiment 3.
FIG. 5 is a diagram showing a schematic configuration of an air conditioner according to a third embodiment of the present invention. The air conditioner 200 adjusts the temperature and humidity of the indoor space by sending an air flow for air conditioning to the indoor space. The air conditioner 200 switches operation modes such as cooling, blowing, dehumidifying, and heating so that the room temperature becomes a target temperature.
　空気調和機２００は、室外機２０１が室内機２０２とは分離されたセパレート型空気調和機である。室外機２０１と室内機２０２とは冷媒配管３６を介して接続される。冷媒が冷媒配管３６に充填されて、冷媒配管３６を介して室外機２０１と室内機２０２との間を冷媒が循環することによって、空気調和機２００は室内と室外との間で熱交換を行う。 The air conditioner 200 is a separate type air conditioner in which the outdoor unit 201 is separated from the indoor unit 202. The outdoor unit 201 and the indoor unit 202 are connected via a refrigerant pipe 36. The refrigerant is filled in the refrigerant pipe 36, and the refrigerant circulates between the outdoor unit 201 and the indoor unit 202 via the refrigerant pipe 36, so that the air conditioner 200 exchanges heat between the indoor and outdoor units. ..
　室外機２０１は、圧縮機３１と、四方弁３２と、室外熱交換器３３と、膨張弁３４と、ファン３９とを有する。圧縮機３１には、冷媒を圧縮する圧縮機構３７と、圧縮機構３７を動作させるモータ３８とが設けられている。また、室外機２０１は、実施の形態１または２にかかる電力変換装置１００を有する。モータ３８は、図１に示す負荷２０である。モータ３８は、電力変換装置１００からの電力供給によって駆動する。室内機２０２は、室内熱交換器３５とファン４０とを有する。 The outdoor unit 201 has a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, an expansion valve 34, and a fan 39. The compressor 31 is provided with a compression mechanism 37 that compresses the refrigerant and a motor 38 that operates the compression mechanism 37. Further, the outdoor unit 201 has a power conversion device 100 according to the first or second embodiment. The motor 38 is the load 20 shown in FIG. The motor 38 is driven by the power supply from the power converter 100. The indoor unit 202 has an indoor heat exchanger 35 and a fan 40.
　圧縮機３１と、四方弁３２と、室外熱交換器３３と、膨張弁３４と、室内熱交換器３５とは、冷媒配管３６を介して接続されている。圧縮機３１と、四方弁３２と、室外熱交換器３３と、膨張弁３４と、室内熱交換器３５とは、冷媒を循環させる閉回路である冷凍サイクルを構成する。なお、空気調和機２００が有する構成要素は、冷凍サイクルを備える冷蔵庫あるいは冷凍庫といった機器にも適用することができる。 The compressor 31, the four-way valve 32, the outdoor heat exchanger 33, the expansion valve 34, and the indoor heat exchanger 35 are connected via a refrigerant pipe 36. The compressor 31, the four-way valve 32, the outdoor heat exchanger 33, the expansion valve 34, and the indoor heat exchanger 35 form a refrigeration cycle that is a closed circuit for circulating the refrigerant. The components of the air conditioner 200 can also be applied to equipment such as a refrigerator or a freezer equipped with a refrigeration cycle.
　室外機２０１において、ファン３９は、回転によって空気流を発生させる。室外機２０１は、空気流を発生させることにより、室外機２０１の筐体内へ空気を送り込み、かつ、筐体内へ送り込まれた空気を筐体外へ送り出す。室外熱交換器３３は、室外熱交換器３３を通過する空気と冷媒との熱交換を行わせる。図５では、室外機２０１の筐体の図示を省略している。 In the outdoor unit 201, the fan 39 generates an air flow by rotation. By generating an air flow, the outdoor unit 201 sends air into the housing of the outdoor unit 201, and sends the air sent into the housing to the outside of the housing. The outdoor heat exchanger 33 causes heat exchange between the air passing through the outdoor heat exchanger 33 and the refrigerant. In FIG. 5, the housing of the outdoor unit 201 is not shown.
　室内機２０２は、図１に示す出力端子２２に接続されている。室内機２０２は、電力変換装置１００からの電力供給を受けて動作する。室内機２０２において、ファン４０は、回転によって空気流を発生させる。室内機２０２は、空気流を発生させることにより、室内機２０２の筐体内へ空気を送り込み、かつ、筐体内へ送り込まれた空気を筐体外へ送り出す。室内熱交換器３５は、室内熱交換器３５を通過する空気と冷媒との熱交換を行わせる。図５では、室内機２０２の筐体の図示を省略している。なお、電力変換装置１００は、ファン３９を回転させるモータあるいはファン４０を回転させるモータへ、３相交流電圧を出力しても良い。 The indoor unit 202 is connected to the output terminal 22 shown in FIG. The indoor unit 202 operates by receiving power supply from the power conversion device 100. In the indoor unit 202, the fan 40 generates an air flow by rotation. By generating an air flow, the indoor unit 202 sends air into the housing of the indoor unit 202 and sends the air sent into the housing to the outside of the housing. The indoor heat exchanger 35 exchanges heat between the air passing through the indoor heat exchanger 35 and the refrigerant. In FIG. 5, the housing of the indoor unit 202 is not shown. The power conversion device 100 may output a three-phase AC voltage to a motor that rotates the fan 39 or a motor that rotates the fan 40.
　実施の形態３によると、空気調和機２００は、実施の形態１または２にかかる電力変換装置１００を有することによって、少ない接地線２１によってノイズを低減することができるという効果を奏する。なお、電力変換装置１００は、商用交流電源１に接続された機器に設けられるものであれば良く、空気調和機２００以外の機器に設けられても良い。 According to the third embodiment, the air conditioner 200 has an effect that noise can be reduced by having a small number of ground wires 21 by having the power conversion device 100 according to the first or second embodiment. The power conversion device 100 may be provided in a device other than the air conditioner 200 as long as it is provided in a device connected to the commercial AC power supply 1.
　以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
　１　商用交流電源、２，３　コモンモードチョークコイル、４　コンバータ、５　インバータ、６　Ｘコンデンサ、７ａ，７ｂ，８ａ，８ｂ，９ａ，９ｂ，１０ａ，１０ｂ　Ｙコンデンサ、１１　平滑コンデンサ、１２，１３，１４，１５　フェライトビーズ、１６，１７，１８，１９　接続点、２０　負荷、２１　接地線、２２　出力端子、２３，２４，２８　配線、２５　電子回路基板、２６　筐体、２７　壁部、３１　圧縮機、３２　四方弁、３３　室外熱交換器、３４　膨張弁、３５　室内熱交換器、３６　冷媒配管、３７　圧縮機構、３８　モータ、３９，４０　ファン、１００　電力変換装置、２００　空気調和機、２０１　室外機、２０２　室内機。 1 Commercial AC power supply, 2, 3 common mode choke coil, 4 converter, 5 inverter, 6 X capacitor, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b Y capacitor, 11 smoothing capacitor, 12, 13, 14 , 15 ferrite beads, 16, 17, 18, 19 connection points, 20 loads, 21 ground wires, 22 output terminals, 23, 24, 28 wiring, 25 electronic circuit boards, 26 housings, 27 walls, 31 compressors, 32 four-way valve, 33 outdoor heat exchanger, 34 expansion valve, 35 indoor heat exchanger, 36 refrigerant wiring, 37 compression mechanism, 38 motor, 39, 40 fan, 100 power converter, 200 air conditioner, 201 outdoor unit, 202 Indoor unit.

Claims (5)

  1. 　交流電源と負荷との間に接続されたコンバータおよびインバータと、
    　前記交流電源と前記コンバータとの間に接続されたコモンモードチョークコイルと、
    　前記交流電源と前記コンバータとを接続する電源ライン同士の間に接続された交流側相間コンデンサと、
    　前記コンバータと前記インバータとを接続する電源ライン同士の間に接続された直流側相間コンデンサと、
    　を備え、
    　前記交流側相間コンデンサおよび前記直流側相間コンデンサの各々の接地には、共通の接地線が用いられており、
    　前記交流側相間コンデンサおよび前記接地線の間の配線と、前記直流側相間コンデンサおよび前記接地線の間の配線との各々に、インダクタンス成分を持つ電子部品が設けられている電力変換装置。     With converters and inverters connected between the AC power supply and the load,
    A common mode choke coil connected between the AC power supply and the converter,
    An AC side phase capacitor connected between the power supply lines connecting the AC power supply and the converter,
    A DC side phase capacitor connected between the power supply lines connecting the converter and the inverter,
    With
    A common ground wire is used for grounding each of the AC side phase capacitor and the DC side phase capacitor.
    A power conversion device in which an electronic component having an inductance component is provided in each of the wiring between the AC side phase capacitor and the ground wire and the wiring between the DC side phase capacitor and the ground wire.
  2. 　前記電力変換装置が有する出力端子と前記負荷とを接続する配線および前記接地線である第１の配線が設けられている領域を囲うことによって、前記第１の配線から前記第１の配線以外の配線である第２の配線へのノイズの伝導を遮断するシールド部を備える請求項１に記載の電力変換装置。 By enclosing the area where the wiring connecting the output terminal of the power conversion device and the load and the first wiring which is the ground wire are provided, the first wiring to other than the first wiring is provided. The power conversion device according to claim 1, further comprising a shield portion that blocks the conduction of noise to the second wiring, which is the wiring.
  3. 　前記接地線は、前記シールド部に接続されている請求項２に記載の電力変換装置。 The power conversion device according to claim 2, wherein the ground wire is connected to the shield portion.
  4. 　前記電子部品は、フェライトビーズである請求項１から３のいずれか１つに記載の電力変換装置。 The power conversion device according to any one of claims 1 to 3, wherein the electronic component is ferrite beads.
  5. 　請求項１から４のいずれか１つに記載の電力変換装置を備える空気調和機。 An air conditioner including the power conversion device according to any one of claims 1 to 4.
PCT/JP2019/016035 2019-04-12 2019-04-12 Power conversion device and air conditioner WO2020208825A1 (en)

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