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公开(公告)号：US20240259018A1
公开(公告)日：2024-08-01
申请号：US18563242
申请日：2022-03-24
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.
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公开(公告)号：US20240313759A1
公开(公告)日：2024-09-19
申请号：US18546741
申请日：2022-02-22
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.
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公开(公告)号：US20250158539A1
公开(公告)日：2025-05-15
申请号：US18833771
申请日：2023-01-17
Inventor： Ryosuke MAEDA , Koji HIGASHIYAMA
Abstract: In a bidirectional switch of a power converter, a first terminal thereof is connected to a connection node between a first switching element and a second switching element. A resonant capacitor is connected between the first terminal of the bidirectional switch and a second DC terminal. A resonant inductor is connected to a second terminal of the bidirectional switch. A regenerative element is connected between the resonant inductor and the second DC terminal. A first control unit controls the first switching element and the second switching element. A second control unit controls the bidirectional switch. A limiter limits the absolute value of a voltage variation rate of a voltage applied between the first and second terminals of the bidirectional switch to a threshold value or less.
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公开(公告)号：US20230145803A1
公开(公告)日：2023-05-11
申请号：US17916743
申请日：2021-04-05
Inventor： Ryosuke MAEDA , Yusuke KINOSHITA , Hidetoshi ISHIDA
CPC classification number: H03K17/166 , H02H3/202
Abstract: A control circuit controls a switching element including a gate and a source corresponding to the gate. The control circuit includes an inductor, a circuit element, and a resistor. The inductor is connected between the gate and the source of the switching element. The circuit element is connected in series to the inductor between the gate and the source. The circuit element allows an electric current to flow therethrough in response to generation of electromotive force in the inductor. The resistor is connected in parallel to the inductor and the circuit element between the gate and the source.
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