公开(公告)号：US20240259018A1

公开(公告)日：2024-08-01

申请号：US18563242

申请日：2022-03-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yusuke KINOSHITA ,  Ryosuke MAEDA ,  Satoshi NAKAZAWA

IPC: H03K17/687

CPC classification number: H03K17/6871

Abstract: In a switch system, a voltage clamping element is connected to a semiconductor switch in parallel. An active clamping circuit is connected between a control terminal and a first main terminal of the semiconductor switch. The active clamping circuit includes a first diode, a second diode, and a control switch. A second anode of the second diode is connected to a first anode of the first diode. The control switch is connected between the first anode of the first diode and the control terminal of the semiconductor switch. A second control unit controls the control switch. A breakdown voltage of the first diode is smaller than a clamp voltage of the voltage clamping element.

公开(公告)号：US20240313759A1

公开(公告)日：2024-09-19

申请号：US18546741

申请日：2022-02-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Ryosuke MAEDA ,  Yusuke KINOSHITA ,  Satoshi NAKAZAWA

IPC: H03K17/0812

CPC classification number: H03K17/08122

Abstract: An on-state voltage measurement circuit includes a detecting switch element, a control unit, a resistive element, and a voltage detection unit. The control unit includes a signal output terminal and a reference potential terminal and controls the detecting switch element. The resistive element is connected between a source terminal of the detecting switch element and the reference potential terminal. A resistance value of the resistive element is greater than an on-state resistance of the detecting switch element. The control unit turns the detecting switch element on when the semiconductor switch element is turned on. The voltage detection unit detects, based on a voltage across the resistive element when the semiconductor switch element and the detecting switch element are both on, the on-state voltage of the semiconductor switch element connected between a drain terminal of the detecting switch element and the reference potential terminal.

公开(公告)号：US20220337239A1

公开(公告)日：2022-10-20

申请号：US17633160

申请日：2020-10-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yusuke KINOSHITA ,  Hidetoshi ISHIDA ,  Hiroyuki HANDA ,  Yuji KUDOH ,  Satoshi NAKAZAWA

IPC: H03K17/687 ,  G01R31/26

Abstract: A switch system includes a bidirectional switch, a first gate driver circuit, a second gate driver circuit, a control unit, a first decision unit, and a second decision unit. The bidirectional switch includes a first source, a second source, a first gate, and a second gate. The first decision unit determines, based on a voltage at the first gate and a first threshold voltage, a state of the first gate in a first period in which a signal to turn OFF the first gate is output from the control unit to the first gate driver circuit. The second decision unit determines, based on a voltage at the second gate and a second threshold voltage, a state of the second gate in a second period in which a signal to turn OFF the second gate is output from the control unit to the second gate driver circuit.