-
公开(公告)号：US09742267B2
公开(公告)日：2017-08-22
申请号：US14781606
申请日：2013-04-02
Applicant: Mitsubishi Electric Corporation
Inventor： Koichi Arisawa , Takuya Shimomugi , Takashi Yamakawa , Keisuke Uemura , Yosuke Shinomoto , Kenta Yuasa , Akihiro Tsumura , Noriyuki Matsubara , Shinsaku Kusube
CPC classification number: H02M3/08 , H02M1/34 , H02M3/156 , H02M2001/0051 , H02M2001/346 , Y02B70/1491
Abstract: A power converter for converting electrical power from a power source to a load, including: a boosting device including a boost rectifier configured to prevent a backflow of a current from the load to the power source, the boosting device being configured to change a voltage of electrical power from the power source to a predetermined voltage; and a commutation device including: a commutation operation device configured to perform a commutation operation of directing a current flowing through the boosting device to an other path; and a commutation rectifier including a plurality of rectifiers and connected in series on the other path, the commutation rectifier being configured to rectify a current relating to commutation, thereby reducing a capacitance component.
-
公开(公告)号：US09692289B2
公开(公告)日：2017-06-27
申请号：US14787527
申请日：2013-06-25
Applicant: Mitsubishi Electric Corporation
Inventor： Shota Kamiya , Kazunori Hatakeyama , Norikazu Ito , Kenta Yuasa , Shoji Isoda
CPC classification number: H02M1/12 , H02M1/4216 , H02M3/158 , H02M7/06 , H02M7/217 , H02P6/14 , H02P6/28 , Y02B70/126
Abstract: A DC power-supply device that suppresses an increase of a harmonic current and deterioration of a power factor without causing any imbalance among respective phase currents, in a configuration in which a three-phase alternating current is converted into a direct current and supplied to a load. The DC power-supply device includes a rectifier circuit, a reactor connected to an input side or an output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit. During a cycle combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, the charging unit is controlled so that a charging frequency becomes 3n times (n is a natural number) the frequency of the three-phase alternating current.
-
公开(公告)号：US12173944B2
公开(公告)日：2024-12-24
申请号：US18003172
申请日：2020-08-21
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Kazunori Sakanobe , Kenta Yuasa , Yasuhiko Wada , Chitose Tanaka
Abstract: A refrigerating and air-conditioning apparatus performs a defrosting operation. The refrigerating and air-conditioning apparatus includes a refrigerant circuit, a temperature sensor, and a heat generation control unit. In the refrigerant circuit, a compressor, a first heat exchanger, an expansion device, a second heat exchanger, and a four-way valve are connected to each other by pipes to allow refrigerant to circulate through the refrigerant circuit. The temperature sensor measures a temperature of the compressor. The heat generation control unit increases a temperature of the compressor when the heat generation control unit detects a decrease in a value measured by the temperature sensor in a defrosting operation performed on the first heat exchanger.
-
公开(公告)号：US10263539B2
公开(公告)日：2019-04-16
申请号：US15764008
申请日：2015-10-01
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Shuta Ishikawa , Akihiro Tsumura , Shinsaku Kusube
Abstract: A power converter includes a transformation circuit configured to transform a rectified voltage, and a converter control unit configured to control a switching element of the transformation circuit. The converter control unit calculates a current command value based on a line voltage or the phase voltage, calculates a current deviation between the current command value and the reactor current, and calculates a switching command value from the current deviation. The converter control unit includes a plurality of integrators for the respective different phase angles of a power supply voltage. The integrator corresponding to a power supply phase angle is caused to accumulate the current deviation, and the integrator corresponding to a phase angle that is advanced by a set delay phase from the power supply phase angle is caused to output the control amount. A switching signal is generated with use of the control amount and the switching command value.
-
公开(公告)号：US09935569B2
公开(公告)日：2018-04-03
申请号：US14894609
申请日：2013-09-30
Applicant: Mitsubishi Electric Corporation
Inventor： Akihiro Tsumura , Kenta Yuasa , Shinsaku Kusube
CPC classification number: H02P6/28 , H01L29/1608 , H02M1/4225 , H02M5/458 , H02M2001/007 , H02P2201/03 , H02P2201/09 , Y02B70/126
Abstract: A motor drive control apparatus according to the present invention includes: a three-phase rectifier to rectify an AC voltage supplied from a three-phase AC source; a booster circuit including a reactor, a switching element, and a backflow preventing element, to boost a DC bus voltage supplied from the three-phase rectifier; a smoothing capacitor to smooth an output of the booster circuit; and an inverter circuit to convert the DC bus voltage smoothed by the smoothing capacitor into an AC voltage and supplying the AC voltage to a motor. During a starting operation of a boosting operation of the booster circuit or a stopping operation of the boosting operation thereof, a rotation speed of the motor is fixed.
-
Patent Agency Ranking
公开(公告)号：US09772131B2
公开(公告)日：2017-09-26
申请号：US14787288
申请日：2013-05-23
Applicant: Mitsubishi Electric Corporation
Inventor： Kazunori Hatakeyama , Shota Kamiya , Kenta Yuasa , Shinya Matsushita , Shinsaku Kusube
IPC: F25B49/02 , H02M7/5395 , F25B1/10 , F25B13/00 , F25B40/00
CPC classification number: F25B49/025 , F25B1/10 , F25B13/00 , F25B40/00 , F25B2313/003 , F25B2341/0662 , F25B2400/13 , F25B2600/021 , H02M7/5395 , Y02B30/741
Abstract: A heat pump device capable of efficiently and reliably preventing a liquid refrigerant from stagnating in a compressor an air conditioner, a heat pump water heater, a refrigerator, and a freezing machine including the heat pump device. The configuration is such that, when the compressor is under operation standby, a high-frequency voltage synchronizing with a carrier signal is supplied to the compressor motor to carry out the locked energization of the compressor motor. From respective inter-phase voltages, respective phase voltages, or respective phase currents of the compressor motor for a plurality of high-frequency energization cycles, the detection values for one high-frequency energization cycle are restored. A power value calculated using the restored detection values for one high-frequency energization cycle is controlled to coincide with a heating power command necessary for discharging the liquid refrigerant stagnated in the compressor to the outside of the compressor.
-
17.发明授权公开(公告)号：US09941834B2
公开(公告)日：2018-04-10
申请号：US15316561
申请日：2014-07-03
Applicant: Mitsubishi Electric Corporation
Inventor： Keiwa Tsukano , Akihiko Iwata , Shinsaku Kusube , Kenta Yuasa , Akihiro Tsumura
CPC classification number: H02P27/14 , F25B31/02 , F25B49/025 , F25B2600/021 , F25B2600/025 , H02M1/14 , H02M5/4585 , H02P27/06
Abstract: A power conversion apparatus, including: an MLC circuit configured to boost an input voltage from a three-phase rectifier; a smoothing capacitor configured to smooth an output of the MLC circuit; an inverter control unit configured to generate a PWM signal; an inverter circuit configured to convert a DC voltage of the smoothing capacitor into an AC voltage based on an input of the PWM signal and to supply the AC voltage to a motor; a boost mode switching unit having at least three boost modes in which a boost level of the input voltage is selected and configured to switch among the at least three boost modes depending on an operation status of the motor determined for the purpose of controlling a refrigeration cycle; and an MLC control unit configured to control the MLC circuit based on the switching by the boost mode switching unit.
-
公开(公告)号：US09816737B2
公开(公告)日：2017-11-14
申请号：US15030389
申请日：2013-10-29
Applicant: Mitsubishi Electric Corporation
Inventor： Shota Kamiya , Kazunori Hatakeyama , Norikazu Ito , Kenta Yuasa , Shoji Isoda
IPC: F25B21/02 , H02M7/217 , H02M3/158 , H02M1/32 , H02M1/42 , F25B31/02 , H02M7/06 , H02M1/36 , H02M1/08 , H02M1/12 , H02M1/00
CPC classification number: F25B31/02 , H02M1/08 , H02M1/12 , H02M1/32 , H02M1/36 , H02M1/42 , H02M1/4225 , H02M3/158 , H02M7/06 , H02M7/062 , H02M7/217 , H02M2001/0009 , H02M2001/007 , Y02B70/126
Abstract: A DC power-supply device that suppresses an excessive inrush current, can prevent breakage of elements and burnout of circuits, and converts alternating current from a three-phase AC power supply into direct current to supply it to a load, includes a rectifier circuit having a reactor connected to input or output side thereof and rectifying the alternating current from the three-phase AC power supply; first and second capacitors and connected in series between output terminals to the load; a charging unit selectively charges one or both of the first and second capacitors; and a control unit controlling the charging unit. When charging of the first and second capacitors is started, the control unit reduces the on-duty ratio, and then, until the on-duty ratio during a normal operation is reached, the control unit executes control such that the on-duty ratio is gradually increased as a predetermined time period is passed.
-
公开(公告)号：US09735666B2
公开(公告)日：2017-08-15
申请号：US14782058
申请日：2013-04-12
Applicant: Mitsubishi Electric Corporation
Inventor： Takuya Shimomugi , Kenta Yuasa , Yosuke Shinomoto , Shinsaku Kusube
CPC classification number: H02M1/32 , H02M1/4225 , H02M3/155 , H02M3/156 , H02M7/06 , H02M2001/322 , Y02B70/126
Abstract: A power conversion device located between an AC power source and a load includes: a rectifier circuit unit that rectifies a voltage of the AC power source; a smoothing unit that smooths a DC voltage on the load side of the rectifier circuit unit; a short-circuiting unit that short-circuits the AC power source; a step-up reactor—located on the AC power source side of the short-circuiting unit; at least one of a reactor current detecting unit—that detects the current of the step-up reactor and a bus voltage detecting unit that detects an output voltage of the smoothing unit; a counterflow preventing element that prevents a counterflow of the current from the smoothing unit to the AC power source; a switching control unit that outputs a control signal for the short-circuiting unit; and a switching frequency changing unit that changes a frequency of the control signal using a logic operation.
-
公开(公告)号：US09692312B2
公开(公告)日：2017-06-27
申请号：US14897250
申请日：2013-09-30
Applicant: Mitsubishi Electric Corporation
Inventor： Kenta Yuasa , Shinsaku Kusube , Akihiro Tsumura , Takuya Shimomugi
CPC classification number: H02M5/458 , F24F11/30 , F25B31/02 , H02M1/32 , H02M1/4225 , H02M7/06 , H02M2001/007 , H02P27/06 , Y02B70/126
Abstract: A power conversion apparatus includes a rectifier, a converter including a reactor, a switching element, and a reverse current prevention element, a smoothing capacitor configured to smooth the output voltage, a current detector configured to detect a reactor current, a voltage detector configured to detect the output voltage, and a converter control unit configured to control operation of the switching element of the converter. The converter-control unit includes a switching command calculation unit configured to calculate a switching command value responsive to a ratio of the rectified voltage to the output voltage in accordance with the output voltage and the reactor current, a switching control unit configured to control operation of the switching element in accordance with the switching command value, and a supply abnormality determination unit configured to determine occurrence of a momentary power failure or voltage sag in accordance with the switching command value.
-
-
-
-
-
-
-
-
-
Search Results
20
records
(took 0.018 seconds)
