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公开(公告)号：US20250007388A1
公开(公告)日：2025-01-02
申请号：US18705853
申请日：2021-11-25
Applicant: Mitsubishi Electric Corporation
Inventor： Takaaki TAKAHARA , Koichi ARISAWA , Haruka MATSUO , Tomohiro KUTSUKI , Yusuke MORIMOTO , Yuya KONDO
Abstract: A power converter installed in a refrigeration cycle applied equipment includes a rectifier configured to rectify a first alternating-current power supplied from a commercial power supply, a capacitor connected to output ends of the rectifier, an inverter configured to convert power output from the rectifier and the capacitor into a second alternating-current power and to output the second alternating-current power to a motor, and a controller configured to control an operation of the inverter such that the second alternating-current power containing pulsation according to pulsation of power flowing into the capacitor from the rectifier is output from the inverter and to reduce current flowing to the capacitor. The power converter is configured to operate such that the pulsation width of the pulsating current generated by the second alternating-current power is different depending on whether an operation of the refrigeration cycle applied equipment is a cooling operation or a heating operation.
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公开(公告)号：US20240007019A1
公开(公告)日：2024-01-04
申请号：US18253996
申请日：2021-01-06
Applicant: Mitsubishi Electric Corporation
Inventor： Haruka MATSUO , Takaaki TAKAHARA , Koichi ARISAWA , Keisuke UEMURA , Yosuke HACHIYA
CPC classification number: H02M7/537 , F25B31/02 , F25B2600/021
Abstract: A power converter includes a converter that rectifies an alternating-current voltage applied from an alternating-current power supply, a capacitor connected to output ends of the converter, an inverter connected both ends of the capacitor, and a controller that controls an operation of the inverter. A voltage output from the converter includes a ripple component due to a voltage fluctuation of the alternating-current voltage. When the controller performs acceleration and deceleration control on the motor, the controller changes a rotational speed command from a command value during the normal control, in a first period in which a rotational speed of the motor is in a first speed range.
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公开(公告)号：US20180350513A1
公开(公告)日：2018-12-06
申请号：US15761656
申请日：2016-10-11
Applicant: Mitsubishi Electric Corporation
Inventor： Satoshi MURAKAMI , Masaki YAMADA , Ryota KONDO , Takaaki TAKAHARA , Yuta KOMATSU
CPC classification number: H02M3/33569 , H01F3/14 , H01F27/2823 , H01F37/00 , H01F2038/426 , H02M3/28 , Y02B70/1425
Abstract: A first winding, a second winding, a fourth winding, and a fifth winding functioning as a transformer are wound around respective side legs of a three-leg core. Third windings functioning as a DC reactor are wound around a center leg. Winding directions of the first winding, the second winding, and the third windings are set so that magnetic fluxes generated by DC currents flowing through the respective windings merge in the same direction at the center leg, and winding directions of the fourth winding and the fifth winding are set so that magnetic fluxes generated by AC currents flowing through the respective windings cancel each other at the center leg. Thus, the transformer and the DC reactor are integrated using the three-leg core, whereby size reduction and loss reduction of the integrated magnetic component are achieved.
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公开(公告)号：US20160197562A1
公开(公告)日：2016-07-07
申请号：US14916345
申请日：2014-06-03
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Ryota KONDO , Takaaki TAKAHARA , Satoshi MURAKAMI , Masaki YAMADA , Naohisa UEHARA , Yuuya TANAKA , Hidehiko KINOSHITA
CPC classification number: H02M7/06 , H02M1/4208 , H02M1/4216 , H02M1/4225 , H02M7/2176 , Y02B70/126
Abstract: An electric power conversion device which performs conversion to desired voltage using charge and discharge of a DC capacitor includes: a reactor connected to a rectification circuit; a leg part in which diodes and first and second switching elements are connected in series between positive and negative terminals of a smoothing capacitor, and to which the reactor is connected; and the DC capacitor. A control circuit performs high-frequency PWM control for the first and second switching elements using the same drive cycle, with their reference phases shifted from each other by a half cycle, and controls a sum and a ratio of ON periods of the first and second switching elements in one cycle, thereby allowing both high-power-factor control for input AC current and voltage control for the DC capacitor.
Abstract translation: 使用直流电容器的充放电进行转换为期望电压的电力变换装置包括：与整流电路连接的电抗器; 其中二极管和第一和第二开关元件串联连接在平滑电容器的正极端子和负极端子之间并且反应器连接到其上的支脚部分; 和直流电容器。 控制电路使用相同的驱动周期对第一和第二开关元件执行高频PWM控制，其基准相位彼此偏移半个周期，并且控制第一和第二开关元件的导通周期的和和的比率 开关元件在一个周期内，从而允许输入交流电流的高功率因数控制和直流电容器的电压控制。
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公开(公告)号：US20240006984A1
公开(公告)日：2024-01-04
申请号：US18254785
申请日：2021-01-06
Applicant: Mitsubishi Electric Corporation
Inventor： Haruka MATSUO , Takaaki TAKAHARA , Koichi ARISAWA , Keisuke UEMURA , Kenji TAKAHASHI
Abstract: A power converter includes a converter, a smoothing capacitor, an inverter, and a controller. The converter rectifies a power supply voltage applied from an alternating-current power supply. The smoothing capacitor smooths a rectified voltage output from the converter into a direct-current voltage including a ripple. The inverter converts the direct-current voltage smoothed by the smoothing capacitor into an alternating-current voltage to be applied to a motor. The controller performs control such that a first physical quantity representing an operation state of the converter is equal to a second physical quantity representing an operation state of the inverter.
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Patent Agency Ranking
公开(公告)号：US20230308025A1
公开(公告)日：2023-09-28
申请号：US18043132
申请日：2020-10-26
Applicant: Mitsubishi Electric Corporation
Inventor： Takaaki TAKAHARA , Koichi ARISAWA , Keisuke UEMURA , Haruka MATSUO , Koyo MATSUZAKI
CPC classification number: H02M5/4585 , H02M1/32 , H02P27/06 , F25B2600/021
Abstract: A power conversion device includes a rectification unit that rectifies first alternating current (AC) power supplied from a commercial power supply, a capacitor connected to an output end of the rectification unit, an inverter that converts power output from the rectification unit and from the capacitor into second AC power, and outputs the second AC power to a load including a motor, which inverter is connected to both ends of the capacitor, and a control unit that controls operation of the inverter to output the second AC power from the inverter to the load to reduce current flowing to the capacitor, which second AC power includes a pulsation that depends on a pulsation of power flowing from the rectification unit to the capacitor. No discharge circuit and no overvoltage protection circuit are provided for the capacitor.
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公开(公告)号：US20230038757A1
公开(公告)日：2023-02-09
申请号：US17790379
申请日：2020-01-21
Applicant: Mitsubishi Electric Corporation
Inventor： Koichi ARISAWA , Takaaki TAKAHARA , Hajime TOYODA , Satoshi MURAKAMI , Keisuke UEMURA , Takahiko KOBAYASHI
Abstract: A power converting apparatus that converts alternating-current power from an alternating-current power supply into direct-current power and outputs the direct-current power to a direct-current load includes at least two switching circuits connected in parallel with the direct-current load; a coupling reactor that includes at least three connection terminals with two of the at least three connection terminals connected to an alternating-current terminal of one switching circuit different from two switching circuits among the at least two switching circuits; and a control unit that performs, at least once in a half period of the alternating-current power supply, a simple switching control that short-circuits the coupling reactor to the alternating-current power supply through the two switching circuits.
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公开(公告)号：US20200267871A1
公开(公告)日：2020-08-20
申请号：US16316126
申请日：2017-06-21
Applicant: Mitsubishi Electric Corporation
Inventor： Takaaki TAKAHARA , Satoshi MURAKAMI , Ryota KONDO , Hiroyasu IWABUKI , Hiroyuki HIGASHINO
Abstract: A power conversion device includes: a main body including a substrate to which a power conversion unit and a coil are provided; and a first heat dissipation portion which holds the substrate and dissipates heat of the substrate, wherein the substrate is formed by one sheet, the coil is formed integrally with the substrate, the first heat dissipation portion is fixed to a substrate first surface of the substrate, a heat dissipation second surface of the first heat dissipation portion has a coil cooling portion opposed to and abutting on a part where the coil is formed, of the substrate.
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公开(公告)号：US20170237354A1
公开(公告)日：2017-08-17
申请号：US15327072
申请日：2015-09-25
Applicant: Mitsubishi Electric Corporation
Inventor： Takaaki TAKAHARA , Satoshi MURAKAMI , Ryota KONDO , Masaki YAMADA , Naohisa UEHARA
CPC classification number: H02M3/33546 , H02M1/08 , H02M1/42 , H02M3/28 , H02M3/33561 , H02M3/33584 , H02M3/3376 , H02M7/12 , H02M7/487 , H02M2001/0009
Abstract: An electric power conversion device includes a transformer composed of three or more windings magnetically coupled with each other, wherein power supply sources, are connected to at least two windings, via switching circuits, a load is connected to at least one winding, and a control circuit temporally divides, within one switching period, a total ON time during which power is supplied, in accordance with the number of the power supply sources, to supply power, the one switching period being the minimum repetitive unit during which power is supplied alternately. The control circuit allocates the divided ON times to the respective switching circuits, and the switching circuits, supply power from the power supply sources, to the load side during the allocated ON times, respectively.
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公开(公告)号：US20160233777A1
公开(公告)日：2016-08-11
申请号：US15021890
申请日：2014-05-21
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Satoshi MURAKAMI , Masaki YAMADA , Ryota KONDO , Takaaki TAKAHARA , Naohisa UEHARA
IPC: H02M3/335
CPC classification number: H02M3/33546 , H02M3/33561 , H02M3/33584 , H02M2001/007
Abstract: The power reception amount of input power from an AC power supply is controlled through a first switching circuit. DC voltage is controlled through a second switching circuit, to control charge power for a first DC voltage source. DC voltage obtained by a third switching circuit is converted to AC by an inverter, to supply the resultant power to an AC load. DC voltage is controlled through a fourth switching circuit, to control charge power for a second DC voltage source. Thus, distribution control of the input power is performed. In addition, in the distribution control of the input power, operation of the second switching circuit or the fourth switching circuit is stopped to allow stop of the charging for the first DC voltage source or the second DC voltage source.
Abstract translation: 通过第一开关电路控制来自交流电源的输入电力的接收电力。 通过第二开关电路控制直流电压，以控制第一直流电压源的充电电力。 由第三开关电路获得的直流电压由逆变器转换为交流电，以将所得的功率提供给交流负载。 通过第四开关电路控制直流电压，以控制第二直流电压源的充电电力。 因此，执行输入功率的分配控制。 此外，在输入功率的分配控制中，停止第二开关电路或第四开关电路的动作，以停止第一直流电压源或第二直流电压源的充电。
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