公开(公告)号：US20200161851A1

公开(公告)日：2020-05-21

申请号：US16589102

申请日：2019-09-30

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Qichen WANG ,  Nobuyuki TAWADA

IPC: H02H3/34 ,  H02H3/253 ,  H02M1/14 ,  G01R31/42

Abstract: A conventional technique makes a configuration complicated. Provided is an apparatus including: a voltage measuring unit configured to measure each of instantaneous voltages of three-phase AC voltage; and a determination unit configured to determine a state of a power supply source of the three-phase AC voltage based on a result of comparison between a comparison target value corresponding to a sum of n-th powers (n is a positive even number) of the instantaneous voltages of the three-phase AC voltage and a reference value.

公开(公告)号：US20170367184A1

公开(公告)日：2017-12-21

申请号：US15583967

申请日：2017-05-01

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Qichen WANG ,  Satoru FUJITA ,  Takashi KUWABARA ,  Nobuyuki TAWADA

IPC: H05K1/18 ,  H01F27/28 ,  H01F27/29 ,  H01F27/32

CPC classification number: H05K1/18 ,  H01F27/28 ,  H01F27/29 ,  H01F27/325 ,  H05K3/306 ,  H05K2201/1003 ,  H05K2201/10818

Abstract: A transformer is configured to include a pair of cores and that each have an inner leg, wherein a primary winding that is wound around a bobbin having a hollow into which the inner legs of the cores and are inserted, and a secondary winding that has a hollow into which the inner legs of the cores and are inserted and that is constituted of a conductor formed by die-cutting a metal plate into a ring, are dispersedly arranged over the inner legs of the cores and. The bobbin has bobbin support portions that come into contact with a surface of a printed circuit board on which the transformer is implemented.

公开(公告)号：US20140104889A1

公开(公告)日：2014-04-17

申请号：US14019221

申请日：2013-09-05

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Ryuji YAMADA ,  Nobuyuki TAWADA

IPC: H02M3/335

CPC classification number: H02M3/335 ,  H02M3/158 ,  H02M3/33569 ,  H02M2001/007

Abstract: A power supply device includes a first semiconductor switching device for controlling an alternating input current waveform, a smoothing capacitor to which a rectified voltage is applied, and an inverter that converts the rectified voltage into alternating current via a step-up chopper. The step-up chopper includes an inductor and a diode connected between the smoothing capacitor and inverter, and a second semiconductor switching device connected to the inductor and diode. The power supply device further includes an instantaneous voltage drop compensation function whereby the energy of the smoothing capacitor is supplied by an operation of the step-up chopper to the inverter when there is an instantaneous voltage drop in an alternating current power supply voltage. MOSFETs with a breakdown voltage lower than that of the first semiconductor switching device are connected between terminals of the step-up chopper, thus further reducing loss in comparison with when a bypass diode is used.

Abstract translation: 电源装置包括用于控制交流输入电流波形的第一半导体开关装置，施加整流电压的平滑电容器，以及经由升压斩波器将整流电压转换成交流电的逆变器。 升压斩波器包括连接在平滑电容器和反相器之间的电感器和二极管，以及连接到电感器和二极管的第二半导体开关器件。 电源装置还包括瞬时电压降补偿功能，其中当交流电源电压中存在瞬时电压降时，平滑电容器的能量由升压斩波器的操作提供给逆变器。 具有低于第一半导体开关器件的击穿电压的MOSFET连接在升压斩波器的端子之间，因此与使用旁路二极管相比进一步降低损耗。