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公开(公告)号：US20160265822A1
公开(公告)日：2016-09-15
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
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.
Abstract translation: 抑制过大的浪涌电流的直流电源装置能够防止元件的损坏和电路的烧坏，并将来自三相交流电源的交流电转换成直流电，将其提供给负载，该整流电路具有： 连接到其输入或输出侧的电抗器，并对来自三相AC电源的交流电进行整流; 第一和第二电容器并串联在输出端子与负载之间; 充电单元选择性地对第一和第二电容器中的一个或两个进行充电; 以及控制所述充电单元的控制单元。 当开始对第一和第二电容器进行充电时，控制单元降低占空比，然后直到达到正常操作期间的占空比，控制单元执行控制，使得占空比为 随着预定时间段的过去，逐渐增加。
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公开(公告)号：US20240007012A1
公开(公告)日：2024-01-04
申请号：US18254777
申请日：2021-01-06
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Kazunori HATAKEYAMA , Keisuke UEMURA
Abstract: A converter for converting AC power from an AC power supply into DC power and outputting the DC power, an inverter for converting the DC power outputted from the converter into AC power of a variable frequency and a variable voltage value, and supplying the AC power to a load, a shunt resistor for detecting an output current of the converter, and a control device for controlling the inverter based on the detected output current are provided. The control device calculates an input current of the converter from the output current detected by the shunt resistor, and, when the calculated input current exceeds a predetermined threshold value, the control device causes the manner of operation of said inverter to be changed so as to reduce the input current of the converter.
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公开(公告)号：US20230402946A1
公开(公告)日：2023-12-14
申请号：US18249079
申请日：2020-12-17
Applicant: Mitsubishi Electric Corporation
Inventor： Shinya TOYODOME , Kazunori HATAKEYAMA , Shoei TSUTSUMI
CPC classification number: H02P21/22 , F25B49/022 , F24F11/86 , H02P27/085
Abstract: In a control device performing PWM control over an inverter for driving a motor, voltage command values are generated using voltage values obtained by performing proportional and integral calculation on current deviations and non-interference control during normal operation, and the voltage command values are generated without using the result of the integral calculation and performing only the non-interference control, at the time of over-modulation. Moreover, the voltage command values are corrected based on a modulation factor. A correction coefficient is so determined that the AC voltages applied to the motor become close to values proportional to the modulation factor. The motor can be operated over a wide range within an over-modulation range.
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14.发明申请公开(公告)号：US20220349407A1
公开(公告)日：2022-11-03
申请号：US17763686
申请日：2019-11-14
Applicant: Mitsubishi Electric Corporation
Inventor： Motoya SUZUKI , Satoru ICHIKI , Keisuke UEMURA , Koichi ARISAWA , Kazunori HATAKEYAMA
Abstract: The power conversion apparatus includes a converter circuit that converts an alternating-current voltage output from an alternating-current power supply into a direct-current voltage. The converter circuit includes unit converters. The power conversion apparatus includes current detectors that detect respective currents flowing through respective reactors. In first and second unit converters adjacent to each other among the unit converters, a phase difference between a first phase and a second phase is changed from a reference phase difference when a total current of currents detected by the respective current detectors is greater than a threshold. The first phase is a phase at a time when the switching element of the first unit converter is turned on. The second phase is a phase at a time when the switching element of the second unit converter is turned on.
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公开(公告)号：US20220316748A1
公开(公告)日：2022-10-06
申请号：US17634413
申请日：2019-11-06
Applicant: Mitsubishi Electric Corporation
Inventor： Keiichiro SHIZU , Kazunori HATAKEYAMA , Atsushi KAWASHIMA , Yuta TOKUDA
Abstract: An air-conditioning apparatus includes an indoor unit and an outdoor unit including a compressor that compresses a refrigerant and a motor drive system that drives the compressor. The motor drive system includes an inverter that converts a DC voltage into an AC voltage, and an electric motor including three stator windings with both ends open. The electric motor operates based on the AC voltage obtained by the inverter. The motor drive system further includes a connection state switching unit that has a function to change the connection state of the three stator windings included in the electric motor, and sets the connection state to a star connection at the start of operation of the air-conditioning apparatus.
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Patent Agency Ranking
公开(公告)号：US20200252017A1
公开(公告)日：2020-08-06
申请号：US16631229
申请日：2017-10-24
Applicant: Mitsubishi Electric Corporation
Inventor： Hiroyuki TAKAYAMA , Kazunori HATAKEYAMA , Keiichiro SHIZU
Abstract: An electric motor drive device includes: a wire connection switching unit; an inverter; a control device controlling the wire connection switching unit and the inverter; and an overcurrent protection circuit preventing current exceeding a predetermined value from continuously flowing through the electric motor. The overcurrent protection circuit includes: determination circuits each correlated one-to-one with any one of possible wire connection states of a stator winding and determining whether current flowing through the inverter is abnormal; a combining circuit combining determination results; and an invalidation circuit invalidating a determination process by one or more of the determination circuits, and causing the combining circuit to output a determination result by the determination circuit correlated with a selected wire connection state of the stator winding. When the determination result output from the combining circuit indicates an abnormal value of the current flowing through the inverter, the control device stops the inverter.
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公开(公告)号：US20200186072A1
公开(公告)日：2020-06-11
申请号：US16614234
申请日：2017-08-08
Applicant: Mitsubishi Electric Corporation
Inventor： Yuhei SHIMADA , Kazunori HATAKEYAMA
IPC: H02P25/18 , H02P27/06 , H02M7/5387 , F25B1/00
Abstract: A drive apparatus for an electric motor includes an inverter, an inverter substrate, a wire connection switching unit, a control unit, and an alternating-current wire electrically connected at one end to the inverter and at the other end to one end of the windings of an electric motor. The drive apparatus for an electric motor includes an alternating-current wire electrically connected at one end to the alternating-current wires and electrically connected at the other end to one end of the wire connection switching unit, and an alternating-current wire electrically connected at one end to the other end of the wire connection switching unit and electrically connected at the other end to the other end of the windings of the electric motor. The drive apparatus for an electric motor includes a noise suppression unit provided at least on the alternating-current wires to suppress noise that occurs in the alternating-current wire.
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18.发明申请公开(公告)号：US20180245831A1
公开(公告)日：2018-08-30
申请号：US15754660
申请日：2015-08-28
Applicant: Mitsubishi Electric Corporation
Inventor： Keisuke UEMURA , Kazunori HATAKEYAMA , Yosuke SHINOMOTO , Koichi ARISAWA
CPC classification number: F25B49/025 , F25B13/00 , F25B30/02 , F25B40/00 , F25B2400/13 , F25B2600/021 , H02P6/085 , H02P6/16 , H02P11/06 , H02P27/08
Abstract: The invention includes an inverter to convert a direct-current voltage from a direct-current power supply into an alternating-current voltage and apply the alternating-current voltage to a motor that rotationally drives a load, a direct-current-voltage detecting unit to detect a voltage in the direct-current power supply, a shunt resistance that is a current detecting unit to detect an electric current flowing to the inverter, and an inverter control unit to generate PWM signals for driving switching elements of the inverter on the basis of the voltage detected by the direct-current-voltage detecting unit and the electric current detected by the shunt resistance, to set a specific phase difference between a phase of a carrier signal used for generation of the PWM signals and a phase of the alternating-current voltage, and to control the inverter such that a frequency of the PWM signals are synchronized with a frequency of the alternating-current voltage, the frequency of the PWM signals being an integer multiple of three times the frequency of the alternating-current voltage.
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公开(公告)号：US20180219508A1
公开(公告)日：2018-08-02
申请号：US15747851
申请日：2015-08-12
Applicant: Mitsubishi Electric Corporation
Inventor： Koichi ARISAWA , Kazunori HATAKEYAMA , Keisuke UEMURA
IPC: H02P27/08 , F25B49/02 , H02P21/22 , H02M7/5395
CPC classification number: H02P27/08 , B60H1/3222 , F25B49/025 , F25B2600/021 , H02M7/217 , H02M7/5395 , H02P21/18 , H02P21/22 , H02P27/085
Abstract: A motor driving device that drives a motor with an alternating-current power converted from a direct-current power supply, includes an inverter that receives a pulse-width modulation signal and supplies the alternating-current power to the motor, and an inverter control unit that generates the pulse-width modulation signal and supplies the pulse-width modulation signal to the inverter. The inverter control unit reduces the number of pulses of the pulse-width modulation signal generated during a first period within one period of a mechanical angle of the motor to be lower than the number of pulses of the pulse-width modulation signal generated during a second period within the one period of the mechanical angle of the motor. The first period is a period during which a load torque is lower than a load torque during the second period.
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公开(公告)号：US20170279377A1
公开(公告)日：2017-09-28
申请号：US15506357
申请日：2014-11-04
Applicant: Mitsubishi Electric Corporation
Inventor： Takuya SHIMOMUGI , Yosuke SHINOMOTO , Koichi ARISAWA , Kazunori HATAKEYAMA
IPC: H02M7/5387 , H02M7/48
CPC classification number: H02M7/53875 , H02K5/18 , H02M1/088 , H02M7/003 , H02M7/48 , H02M7/53871 , H02M7/5395 , H02M2001/0009 , H02M2001/008 , H02M2007/53876 , H02P25/16 , H02P27/08
Abstract: A motor drive apparatus driving a motor as a three-phase motor converting direct current into three-phase alternating current, includes: inverter modules and equivalent in number to phases of the motor; and a control unit generating PWM signals used to drive the inverter modules with PWM. The inverter modules each include a plurality of switching element pairs connected in parallel, each of the switching element pairs including two switching elements connected in series.
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