公开(公告)号：US20230024780A1

公开(公告)日：2023-01-26

申请号：US17758404

申请日：2020-12-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： HIROKI AKASHI ,  TAKUYA ISHII ,  YOSHIHITO KAWAKAMI ,  KAZUHIRO YAHATA ,  TAKESHI AZUMA ,  YOSHIHISA MINAMI

IPC: H02M3/156 ,  H02M1/08 ,  H03F3/217

Abstract: A switch circuit is configured of a first semiconductor element and a second semiconductor element connected in series, and receives a DC voltage of 100 V or more. The drive circuit causes the first semiconductor element or the second semiconductor element to perform a switching operation. The isolated power supply circuit converts a predetermined power supply voltage into an isolated first power supply voltage, and outputs the first power supply voltage to the drive circuit. The isolation signal converter converts a first signal of 6 MHz or more into an isolated first drive signal, and outputs the first drive signal to the drive circuit. The single substrate mounts the isolated power supply circuit and the isolation signal converter. Both the first semiconductor element and the second semiconductor element are wide bandgap semiconductor elements.

公开(公告)号：US20170141690A1

公开(公告)日：2017-05-18

申请号：US15421614

申请日：2017-02-01

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： TATSUYA SAKURAI ,  TAKASHI SAJI ,  YOSHIHISA MINAMI ,  KEITA KAWABE

IPC: H02M3/335

CPC classification number: H02M3/33569 ,  H02M1/36 ,  H02M3/33507 ,  H02M2001/0035 ,  Y02B70/16

Abstract: A switching power supply device of the present disclosure includes a device connection state detection circuit that detects a connection state in a load device connection terminal, in a power supply system having the load device connection terminal. The device connection state detection circuit includes a transformer, a switching element, a pulse generator, and a waveform detection circuit. The waveform detection circuit detects a voltage or a current generated at a connecting point between a primary winding wire of the transformer and the switching element in response to operation of a pulse signal. The waveform detection circuit compares the voltage or the current with a predetermined reference value, and outputs an output signal in response to a comparison result to an OFF terminal.