US9271432B2 - Power conversion device with reduced noise source current, reduced high frequency current and reduced resonance current - Google Patents

Power conversion device with reduced noise source current, reduced high frequency current and reduced resonance current Download PDF

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US9271432B2
US9271432B2 US14/348,345 US201114348345A US9271432B2 US 9271432 B2 US9271432 B2 US 9271432B2 US 201114348345 A US201114348345 A US 201114348345A US 9271432 B2 US9271432 B2 US 9271432B2
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core
ground
conductor
inverter
power conversion
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US20140240948A1 (en
Inventor
Ryo Yokozutsumi
Akihiro Murahashi
Takushi Jimichi
Satoshi Azuma
Yasuhiro Shiraki
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Nexgen Control Systems LLC
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0064—Earth or grounding circuit
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20409—Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing
    • 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
    • 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

Definitions

  • the present invention relates to a power conversion device.
  • a power conversion device includes an inverter that receives power from a direct-current power supply system and drives a motor as a load, a fin as a cooling unit that cools down the inverter, a first core including a through hole that allows passage of a high voltage line that connects the direct-current power supply system and the inverter and a ground line that grounds the inverter, a first ground line that grounds the fin, a second ground line that grounds the motor, and a second core including a through hole.
  • the first ground line is connected to a ground line on the side of the direct-current power supply system with respect to the first core, and a resonance path that circulates the inverter, the fin, the first ground line, a common ground point of the first ground line and the second ground line, the motor, the second ground line, and the inverter is arranged to pass through the through hole of the second core, thereby increasing high frequency impedance of the resonance path and suppressing a noise source current in the power conversion device (see, for example, Patent Literature 1).
  • the present invention has been achieved in view of the above, and an object of the present invention is to provide a power conversion device that can further reduce a noise source current, a high frequency current, and a resonance current.
  • the present invention is directed to a power conversion device that achieves the object.
  • the power conversion device includes an inverter that receives power from a direct-current power supply system and drives a motor as a load; a cooler that cools down the inverter; a first core including a through hole that allows passage of a positive side conductor that connects the direct-current power supply system and the inverter and a negative side conductor that grounds the inverter; a first ground conductor that is connected to the negative side conductor on a side of the direct-current power supply system with respect to the first core and grounds the cooler; a second ground conductor that is connected to the negative side conductor on the side of the direct-current power supply system with respect to the first core and grounds the motor in an alternate-current manner via a capacitive element; and a third ground conductor including one end that is connected to the negative side conductor on the side of the direct-current power supply system or the first ground conductor with respect to the first core and the other end that is grounded.
  • a noise source current, a high frequency current, and a resonance current can further be reduced.
  • FIG. 1 is a configuration example of an electric-vehicle driving system including a power conversion device according to an embodiment of the present invention.
  • FIG. 2 is exemplary diagrams of a first noise path that can be generated in the power conversion device according to the present embodiment.
  • FIG. 3 is exemplary diagrams of a second noise path that can be generated in the power conversion device according to the present embodiment.
  • FIG. 4 is exemplary diagrams of a third noise path that can be generated in the power conversion device according to the present embodiment.
  • FIG. 5 is exemplary diagrams of a fourth noise path that can be generated in the power conversion device according to the present embodiment.
  • FIG. 6 is a perspective view of a general shape of a ring-shaped ferrite core as an example of a first core and a second core according to the present embodiment.
  • FIG. 7 is an example of impedance characteristics that are suitable for the first core and the second core according to the present embodiment.
  • FIG. 1 is a configuration example of an electric-vehicle driving system including a power conversion device according to an embodiment of the present invention.
  • the electric-vehicle driving system according to the present embodiment includes, as shown in FIG. 1 , a pantograph 1 , a reactor 2 , a power conversion unit 30 , and a motor 6 .
  • the power conversion unit 30 includes a filter condenser 3 that receives power from a direct-current power supply system via the pantograph 1 and the reactor 2 and accumulates direct-current power, an inverter 4 that converts a direct-current voltage of the filter condenser 3 into an alternate-current voltage and drives the motor 6 as a load, a first core 8 provided on an input side of the inverter 4 as an element of impedance, a second core 9 provided on an output side of the inverter 4 as an element of impedance, a fin 5 as a cooler that cools down a semiconductor element 4 A constituting the inverter 4 , and a condenser 10 as a capacitive element for connecting ground potential on the input side of the inverter 4 and ground potential of the motor 6 in an alternating-current manner.
  • a filter condenser 3 that receives power from a direct-current power supply system via the pantograph 1 and the reactor 2 and accumulates direct-current power
  • an inverter 4 that converts a
  • a connection configuration of the power conversion unit 30 and external constituent elements and an internal connection configuration of the power conversion unit 30 are described below.
  • two lines including a positive side conductor 21 that connects the reactor 2 and the inverter 4 and a negative side conductor 22 that grounds the inverter 4 to a ground 7 are provided on an input side of the power conversion unit 30 (the side of the direct-current power supply system).
  • the positive side conductor 21 and the negative side conductor 22 are arranged to pass through a through hole of the first core 8 and connected to the inverter 4 .
  • load conductors 23 ( 23 a , 23 b , and 23 c ), which connect the inverter 4 and the motor 6 as a load, are provided on an output side of the power conversion unit 30 (the side of the motor 6 ). These load conductors 23 are arranged to pass through a through hole of the second core 9 and connected to the motor 6 .
  • a ground 41 for grounding the motor 6 as a device is provided in a peripheral portion of the motor 6 , and a motor yoke 6 A, which is a part of a configuration that constitutes the motor 6 , and the ground 41 are electrically connected to each other.
  • a ground conductor 50 which is a first ground conductor (a conductor such as a ground line or a bus bar), is connected to the fin 5 and a connection point 27 that is an arbitrary point on the negative side conductor 22 located on the side of the direct-current power supply system with respect to the first core 8 . That is, the fin 5 is grounded to the same potential (equipotential) as the ground 7 via the ground conductor 50 and the negative side conductor 22 .
  • a ground conductor 59 which is a second ground conductor, connects the motor yoke 6 A, which is grounded to the ground 41 , to a connection point 28 on the negative side conductor 22 located on the side of the direct-current power supply system with respect to the first core 8 via the condenser 10 .
  • a ground conductor 61 which is a third ground conductor, is connected between a connection point 29 , which is an arbitrary point on the ground conductor 50 , and a ground 40 via a connection point 30 B that is an arbitrary point on a casing 30 A of the power conversion unit 30 .
  • the connection points 27 and 28 can be connected to any portion (even outside the casing 30 A) so long as the points are on the side of the direct-current power supply system with respect to the core 8 in the power conversion unit 30 .
  • the ground conductor 61 can be connected to an end portion of one side of the ground conductor 50 or the fin 5 located near the end portion of the one side of the ground conductor 50 , or can be connected to the connection point 27 that is an end portion of the other side of the ground conductor 50 or in proximity of the end portion of the other side of the ground conductor 50 . That is, the arbitrary point on the negative side conductor 22 , which is located on the side of the direct-current power supply system with respect to the fin 5 or the first core 8 , is grounded to the same potential (equipotential) as the ground 40 via the ground conductor 61 .
  • the fin 5 can be directly connected to the casing 30 A of the power conversion unit 30 . This configuration eliminates the necessity of insulating the fin 5 from the casing of the power conversion unit 30 , thereby enabling a simplification of the manufacturing process.
  • connection point 30 B is connected to the ground 40
  • the ground point on the casing 30 A is the connection point 30 B
  • the casing 30 A can be grounded at any point other than the connection point 30 B.
  • an electrical grounding is obtained.
  • FIG. 2 is exemplary diagrams of a first noise path that can be generated in the power conversion device according to the present embodiment. More specifically, FIG. 2( a ) depicts the first noise path on the configuration diagram shown in FIG. 1 , and FIG. 2( b ) depicts an equivalent circuit of the noise path in an electric-vehicle driving system.
  • a point A indicates the connection point 28 (or the connection point 27 )
  • a point B indicates an output terminal of the inverter 4
  • a point C indicates the fin 5 (or the connection point 29 )
  • a point D indicates the connection point 30 B on the casing 30 A
  • a point E indicates the motor yoke 6 A.
  • a circuit unit 71 that simulates the impedance of the first core 8 , a circuit unit 72 that simulates the impedance of the negative side conductor 22 located on the right side of the connection point 28 (the side of the inverter 4 ), and a noise source 73 as a source of generating a common mode noise are arranged between the point A and the point B.
  • a fin stray capacitance 86 that is a stray capacitance of the fin 5 is arranged between the point B and the point C
  • a circuit unit 74 that simulates the impedance of the ground conductor 50 is arranged between the point A and the point C
  • a circuit unit 76 that simulates the impedance of the ground conductor 61 is arranged between the point C and the point D
  • a circuit unit 77 that simulates the impedance of a vehicle body is arranged between the point D and the point E
  • a circuit unit 80 that simulates the impedance of a line of the ground conductor 59 inside the casing
  • a capacitance 79 that is a capacitance value of the condenser 10
  • a circuit unit 78 that simulates the impedance of a cable of the ground conductor 59 outside the vehicle are arranged between the point A and the point E
  • a circuit unit 81 that simulates the impedance of a conductor of the load conductors 23 inside the
  • the equivalent circuit of the electric-vehicle driving system can be represented as the equivalent circuit shown in FIG. 2( b ), and a plurality of noise paths can be generated in the electric-vehicle driving system.
  • FIGS. 2( a ) and 2 ( b ) depict the first noise path among the plurality of noise paths that can be generated in plural numbers.
  • the first noise path is a path of the inverter 4 ⁇ the fin 5 ⁇ the first core 8 ⁇ the inverter 4 , with the inverter 4 as the start point and the end point. In this first noise path, as shown in FIG.
  • a resistance component, an inductance component, and a capacitance component are included in the path, which constitutes a resonance circuit.
  • the impedance is likely to be decreased at a specific frequency so that a noise current is likely to be increased.
  • the first core 8 has an impedance larger than impedances of the other impedance elements in the path, and thus a resonance frequency can be decreased so that it is possible to suppress decrease of the impedance in a high frequency band.
  • a switching frequency is shifted to a high frequency side with respect to a switching element included in the power conversion device, and even under a condition that the noise source current, the high frequency current, and the resonance current are increased in a higher frequency region, the increase of these currents can be suppressed.
  • FIG. 3 is exemplary diagrams of a second noise path that can be generated in the power conversion device according to the present embodiment, and in the same manner as FIG. 2 , the path is shown on the configuration diagram and the equivalent circuit diagram.
  • the second noise path is a path of the inverter 4 ⁇ the fin 5 ⁇ the ground 40 ⁇ the ground 41 ⁇ the motor yoke 6 A ⁇ the condenser 10 ⁇ the first core 8 ⁇ the inverter 4 , with the inverter 4 as the start point and the end point.
  • this second noise path also, as shown in FIG. 3( b ), a resistance component, an inductance component, and a capacitance component are included in the path, which constitute a resonance circuit, and thus the impedance is likely to be decreased at a specific frequency so that a noise current is likely to be increased.
  • the first core 8 has an impedance larger than impedances of the other impedance elements in the path, and thus a resonance frequency can be decreased so that it is possible to suppress decrease of the impedance in a high frequency band.
  • a switching frequency is shifted to a high frequency side with respect to a switching element included in the power conversion device, and even under a condition that the noise source current, the high frequency current, and the resonance current are increased in a higher frequency region, the increase of these currents can be suppressed.
  • the second noise path shown in FIG. 3 is a new noise path caused by the connection of the ground conductor 61
  • the first core 8 exists in the second noise path as described above and the first noise path shown in FIG. 2 has a lower impedance, and thus there is practically no adverse effect due to the second noise path.
  • FIG. 4 is exemplary diagrams of a third noise path that can be generated in the power conversion device according to the present embodiment, and in the same manner as FIGS. 2 and 3 , the path is shown on the configuration diagram and the equivalent circuit diagram.
  • the third noise path is a path of the inverter 4 ⁇ the second core 9 ⁇ the motor 6 ⁇ the motor yoke 6 A ⁇ the condenser 10 ⁇ the first core 8 ⁇ the inverter 4 , with the inverter 4 as the start point and the end point.
  • this third noise path also, as shown in FIG. 4( b ), a resistance component, an inductance component, and a capacitance component are included in the path, which constitute a resonance circuit, and thus the impedance is likely to be decreased at a specific frequency so that a noise current is likely to be increased.
  • the first core 8 and the second core 9 have impedances larger than impedances of the other impedance elements in the path, and thus a resonance frequency can be decreased so that it is possible to suppress decrease of the impedance in a high frequency band.
  • a switching frequency is shifted to a high frequency side with respect to a switching element included in the power conversion device, and even under a condition that the noise source current, the high frequency current, and the resonance current are increased in a higher frequency region, the increase of these currents can be suppressed.
  • the impedance of the second core 9 is added in series to the first core 8 , and thus the effect of suppressing the decrease of the impedance in the high frequency band can be enhanced.
  • FIG. 5 is exemplary diagrams of a fourth noise path that can be generated in the power conversion device according to the present embodiment, and in the same manner as FIGS. 2 to 4 , the path is shown on the configuration diagram and the equivalent circuit diagram.
  • the fourth noise path is a path of the inverter 4 ⁇ the second core 9 ⁇ the motor 6 ⁇ the motor yoke 6 A ⁇ the ground 41 ⁇ the ground 40 ⁇ the first core 8 ⁇ the inverter 4 , with the inverter 4 as the start point and the end point.
  • a resistance component, an inductance component, and a capacitance component are included in the path, which constitute a resonance circuit, and thus the impedance is likely to be decreased at a specific frequency so that a noise current is likely to be increased.
  • both the first core 8 and the second core 9 have impedances larger than impedances of the other impedance elements in the path, and thus a resonance frequency can be decreased so that it is possible to suppress decrease of the impedance in a high frequency band.
  • a switching frequency is shifted to a high frequency side with respect to a switching element included in the power conversion device, and even under a condition that the noise source current, the high frequency current, and the resonance current are increased in a higher frequency region, the increase of these currents can be suppressed.
  • the impedance of the second core 9 is added in series to the first core 8 , and thus the effect of suppressing the decrease of the impedance in the high frequency band can be enhanced.
  • the fourth noise path is a path generated by connecting the ground conductor 61 between the connection point 29 on the ground conductor 50 and the ground 40 , which has a parallel relationship with the third noise path, and thus there is a concern that the impedance is decreased.
  • the motor stray capacitance has a relatively large impedance in a low frequency band while both the first core 8 and the second core 9 are arranged on the path, and thus such a concern can be eliminated.
  • the third noise path is relatively longer than the other noise paths, there is a concern that the amount of noise emitted in proportion to the area of a loop formed by the path is also relatively increased.
  • the connection of the ground conductor 61 between the connection point 29 on the ground conductor 50 and the ground 40 enables the potential of the point C of the fin 5 to be more stabilized with respect to the point E of the motor yoke 6 A, and thus the current flowing through the third noise path is reduced. Therefore, the noise amount emitted by the third noise path can be reduced accordingly, and as a result, the concern is eliminated.
  • simplification of the mechanical structure can also be achieved.
  • FIG. 6 is a perspective view of an overview shape of a ring-shaped ferrite core as an example of the first core 8 and the second core 9 according to the present embodiment.
  • This ring-shaped ferrite core 90 includes a through hole 92 as shown in the drawing.
  • the load conductors 23 23 ( 23 a , 23 b , and 23 c ) are inserted through the through hole 92 .
  • Si element As a switching element included in the inverter, a semiconductor transistor element of silicon (Si) (hereinafter, “Si element”) is generally used.
  • SiC element silicon carbide
  • the reason why the SiC element can perform a high-speed switching operation is because it can be used at a high temperature, with its high heat resistance, so that the allowable operating temperature of a module including the SiC element can be raised higher, and thus, even when the switching speed is increased by increasing a carrier frequency, it is possible to suppress any increase in the size of the cooler.
  • the usage of the SiC element increases a high frequency component of an output voltage of the inverter, and thus a high frequency current generated by the high frequency voltage works as a noise source, resulting in a concern that malfunctioning of a signaler or the like may be caused.
  • the reason why the usage of the SiC element increases the high frequency component of the output voltage includes the following two main points.
  • the SiC is a wide-bandgap semiconductor
  • a structure of a unipolar device can be adopted, so that an accumulated carrier is substantially zero. Therefore, a loss at the time of switching can be reduced while dv/dt and di/dt are increased and noise is increased.
  • the SiC element when used as the switching element included in the inverter, the high frequency current generated by the high frequency component of the output voltage of the inverter works as a noise source, resulting in a concern that malfunctioning of an on-vehicle signaler, a ground signaler, or the like may be caused.
  • FIG. 7 is an example of the impedance characteristics that are suitable for the first core 8 and the second core 9 according to the present embodiment.
  • the waveform of the solid line portion indicates a frequency characteristic on a magnitude (an absolute value) of the impedance
  • the waveform of the dashed line portion indicates a frequency characteristic on a phase of the impedance.
  • the roles of the first core 8 and the second core 9 are to increase the impedances of the first to fourth noise paths described above, thus reducing the noise currents on these paths.
  • the absolute value of the impedance is increased as the frequency is increased, and the phase of the impedance approaches zero (deg) as the frequency is increased. That is, the characteristics shown in FIG. 7 represent, as the frequency is increased, characteristics that gradually change from an inductance component to a resistance component and the absolute value of the impedance is increased. As a main component of the impedance approaches a resistance, a damping effect can be obtained, and as the absolute value of the impedance is increased, the noise current can be decreased. Therefore, it can be said that the ferrite core having the characteristics as shown in FIG. 7 is an impedance element that is suitable when it is used as the first core 8 and the second core 9 according to the present embodiment.
  • the impedance of the ferrite core is increased as the volume is increased. Therefore, when the same material is used, it is more effective to increase the weight or the volume of the first core 8 than the weight or the volume of the second core 9 .
  • the second core 9 can be omitted in this case.
  • the element for reducing the noise source current, the high frequency current, and the resonance current for example, the ferrite core (a magnetic core) as shown in FIG. 6 is used; however, as substitute for the magnetic core, for example, an element such as a reactor and a common-mode choke coil, that is, an impedance element having an inductance component, can also be used.
  • an element such as a reactor and a common-mode choke coil, that is, an impedance element having an inductance component
  • any type of impedance element can be used.
  • the power conversion device according to the present invention is useful in further reducing a noise source current, a high frequency current, and a resonance current.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inverter Devices (AREA)
  • Power Conversion In General (AREA)
US14/348,345 2011-09-30 2011-09-30 Power conversion device with reduced noise source current, reduced high frequency current and reduced resonance current Active 2031-11-13 US9271432B2 (en)

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US11228234B2 (en) * 2018-10-25 2022-01-18 Abb Schweiz Ag Power converter arrangement attenuation element for electrical ringing

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WO2016162944A1 (ja) * 2015-04-07 2016-10-13 株式会社日立製作所 電力変換装置
EP3624321B1 (en) * 2017-05-09 2021-06-23 Mitsubishi Electric Corporation Power conversion device
JP7152296B2 (ja) * 2018-12-20 2022-10-12 株式会社日立製作所 電力変換装置、及び高電圧ノイズフィルタ
DE102021214906A1 (de) 2021-10-14 2023-04-20 Vitesco Technologies Germany Gmbh Elektronische Baugruppe

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