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公开(公告)号：US09998007B2
公开(公告)日：2018-06-12
申请号：US15320503
申请日：2014-09-05
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Shinsaku Kusube , Akihiro Tsumura , Akihiko Iwata
CPC classification number: H02M3/158 , H02M1/08 , H02M1/14 , H02M2001/0054 , Y02B70/1491
Abstract: A power conversion device is provided that includes a rectifier, a booster circuit configured to boost an output voltage of the rectifier, a smoothing capacitor configured to smooth an output voltage of the booster circuit, and an inverter circuit configured to convert a DC voltage of the smoothing capacitor to an AC voltage and drive a motor forming a part of a device supplied with the voltage after the conversion. In addition, a reactor, a first backflow prevention element, a second backflow prevention element, a first switching element, a second switching element, an intermediate capacitor, and a controller configured to control the first switching element and the second switching element, are included.
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2.发明授权公开(公告)号：US09787246B2
公开(公告)日：2017-10-10
申请号：US15102624
申请日：2014-03-15
Applicant: Mitsubishi Electric Corporation
Inventor： Akihiro Tsumura , Shinsaku Kusube , Kenta Yuasa
CPC classification number: H02P29/50 , F25B49/022 , F25B49/025 , F25B2500/07 , F25B2600/0253 , F25B2600/111 , F25B2600/112 , F25B2700/151 , H02M1/14 , H02M7/537 , H02M2001/007 , H02P6/14 , H02P27/08
Abstract: A motor drive control device includes a three-phase rectifier; a boosting circuit including a reactor, a switching element, and a backflow preventing element and boosts a direct-current bus voltage supplied from the three-phase rectifier; a smoothing capacitor; an inverter circuit; a boosting control unit; an inverter control unit; and a circuit protecting unit suppresses a ripple current flowing through the smoothing capacitor. In the circuit protecting unit, a correlation of an on-duty ratio of the switching element included in the boosting circuit, the output power of the inverter circuit, and an estimated ripple current are set. On the basis of the on-duty ratio of the switching element, output power of the inverter circuit, and the correlation, the circuit protecting unit determines an estimated ripple current flowing through the smoothing capacitor. When the estimated ripple current exceeds a preset threshold, the circuit protecting unit suppresses the ripple current.
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公开(公告)号：US09712071B2
公开(公告)日：2017-07-18
申请号：US14908177
申请日：2013-09-26
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Shinsaku Kusube , Akihiro Tsumura
IPC: H02M7/48 , H02M5/458 , H02M7/04 , H02P27/04 , H02P27/06 , H02P29/68 , H02M3/156 , H02M1/00 , H02M1/32
CPC classification number: H02M5/458 , H02M3/156 , H02M7/04 , H02M2001/007 , H02M2001/327 , H02P27/04 , H02P27/06 , H02P29/68 , H02P2201/09
Abstract: A power conversion device includes: a rectifier, a converter unit including a reactor, a backflow prevention element, and a switching element, the converter unit being configured to boost a DC voltage rectified by the rectifier, a smoothing capacitor, a reactor current detection unit, a bus voltage detection unit, a temperature detection unit, and a control unit. The control unit includes a converter control unit configured to calculate a switching command value for driving the switching element, on the basis of a target command voltage which is the bus voltage to be targeted, the bus voltage detected by the bus voltage detection unit, and the reactor current detected by the reactor current detection unit, and a temperature correction unit configured to correct the temperature of the switching element detected by the temperature detection unit, on the basis of the switching command value calculated by the converter control unit.
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公开(公告)号：US10404196B2
公开(公告)日：2019-09-03
申请号：US14902039
申请日：2014-07-02
Applicant: Mitsubishi Electric Corporation
Inventor： Takuya Shimomugi , Koichi Arisawa , Takashi Yamakawa , Keisuke Uemura , Noriyuki Matsubara , Shinsaku Kusube , Kenta Yuasa , Akihiro Tsumura
IPC: H02P6/28 , H02M3/158 , F24F7/007 , F25B31/02 , H02M1/34 , H02P27/06 , H02M1/00 , H02M1/42 , H02M7/00
Abstract: A backflow preventing device includes a backflow preventing element that is connected between a power supply and a load and that prevents electric current from flowing backward from the load side toward the power supply side, and a commutating device that performs a commutation operation for causing the electric current to flow to a commutation path connected in parallel with the backflow preventing element. A plurality of elements including at least one or more of elements constituting the commutating device are configured as a module, so that, for example, the device can be reduced in size. Moreover, a simplified heat-dissipation design and a simplified air-duct design can be achieved.
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公开(公告)号：US09621025B2
公开(公告)日：2017-04-11
申请号：US14901270
申请日：2013-07-02
Applicant: Mitsubishi Electric Corporation
Inventor： Takuya Shimomugi , Koichi Arisawa , Takashi Yamakawa , Keisuke Uemura , Noriyuki Matsubara , Shinsaku Kusube , Kenta Yuasa , Akihiro Tsumura
CPC classification number: H02M1/32 , H02M3/156 , H02M3/158 , H02M2001/0051 , H02M2001/325 , H02P27/06 , H03K17/16 , H03K17/74 , Y02B70/1491
Abstract: A backflow preventing device includes a backflow preventing element that is connected between a power supply and a load and that prevents electric current from flowing backward from the load side toward the power supply side, a commutating device that performs a commutation operation for causing the electric current to flow to a commutation path connected in parallel with the backflow preventing element, and a controller that sets a time for performing the commutation operation and causes the commutating device to perform the commutation operation based on the set time. The backflow preventing device has a plurality of the commutation paths and has, for example, elements with small current-carrying capacities disposed in the commutation paths to achieve cost reduction and to cope with, for example, failures, thereby allowing for enhanced reliability for reducing recovery electric current.
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Patent Agency Ranking
公开(公告)号：US12032025B2
公开(公告)日：2024-07-09
申请号：US17781367
申请日：2020-02-17
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Kazunori Sakanobe , Mamoru Kamikura , Toshiyuki Kuriyama
IPC: G01R31/34 , G01R19/00 , H02P25/022 , H02P27/06
CPC classification number: G01R31/34 , G01R19/0092 , H02P25/022 , H02P27/06
Abstract: a permanent magnet synchronous motor diagnostic device includes: a negative-sequence current calculator that calculates a negative-sequence current, based on magnitudes of a plurality of phase currents flowing through a permanent magnet synchronous motor that rotates a load; and a deterioration diagnoser that diagnoses deterioration of a plain bearing supporting the permanent magnet synchronous motor, based on the negative-sequence current.
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公开(公告)号：US11509232B2
公开(公告)日：2022-11-22
申请号：US16958466
申请日：2018-02-16
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Akihiro Tsumura , Shigeo Takata , Shinsaku Kusube
Abstract: A power converter includes a rectifier configured to rectify an AC voltage supplied from an AC power supply, a booster circuit configured to boost the voltage rectified by the rectifier, a smoothing capacitor configured to smooth the voltage output from the booster circuit, a power module configured to convert a DC voltage obtained by smoothing the output voltage by the smoothing capacitor into an AC voltage, and a snubber capacitor configured to absorb a surge voltage superimposed on the DC voltage to be input to the power module. The snubber capacitor is mounted in the power module.
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公开(公告)号：US11486613B2
公开(公告)日：2022-11-01
申请号：US16330579
申请日：2016-11-11
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Yoshihiro Taniguchi , Yoshikazu Nozuki
Abstract: A power converter includes a first substrate on which a module including a switching element is mounted, a second substrate on which a smoothing capacitor is mounted, and a terminal block connecting the first substrate and the second substrate, with the first and second substrates located to face each other. The terminal block includes a current path over which at least one of current flowing from the module to the smoothing capacitor and current flowing from the smoothing capacitor to the module flows.
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公开(公告)号：US10116205B2
公开(公告)日：2018-10-30
申请号：US14901251
申请日：2014-07-02
Applicant: Mitsubishi Electric Corporation
Inventor： Koichi Arisawa , Takuya Shimomugi , Takashi Yamakawa , Keisuke Uemura , Noriyuki Matsubara , Shinsaku Kusube , Kenta Yuasa , Akihiro Tsumura
Abstract: Provided is a power conversion device configured to convert electric power from a power source to a load, including: a boosting device including a boost rectification unit configured to prevent backflow of a current from the load side to the power source side, the boosting device being configured to change a voltage of power from the power source to a predetermined voltage based on a drive signal; a commutation device configured to perform commutation operation in which a current flowing through the boosting device is caused to flow into an other path based on a commutation signal; and a signal generating module device configured as a module to generate and send an output signal based on an input signal that is input thereto. The input signal has an on-pulse width greater than a length of time where the output signal generated by the signal generating module device is turned on.
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10.发明授权公开(公告)号：US10003184B2
公开(公告)日：2018-06-19
申请号：US14780036
申请日：2014-03-18
Applicant: Mitsubishi Electric Corporation
Inventor： Takuya Shimomugi , Koichi Arisawa , Takashi Yamakawa , Keisuke Uemura , Shinsaku Kusube , Kenta Yuasa , Akihiro Tsumura
IPC: F25B49/00 , H02P6/04 , H02M3/335 , H02M1/12 , H02H3/00 , H02M3/158 , H02M1/42 , H02M1/00 , H02M1/34
CPC classification number: H02H3/003 , H02M1/4225 , H02M3/158 , H02M2001/0051 , H02M2001/342 , Y02B70/126 , Y02B70/1491
Abstract: A backflow preventing device includes a backflow preventing element connected between a power source and a load, for preventing a backflow of a current from the load side to the power source side, a commutation device configured to perform a commutation operation of causing a current to flow through an other path connected in parallel to the backflow preventing element, and a controller configured to change a pulse width of a commutation drive signal for controlling the commutation device to perform the commutation operation based on a current flowing through the backflow preventing element, and transmitting the commutation drive signal having the changed pulse width to the commutation device. The controller transmits the pulse to the commutation device only for a necessary time period so that the commutation device performs the commutation operation, to thereby reduce electric power relating to the commutation operation not contributing to the power conversion.
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