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公开(公告)号：US20230223746A1
公开(公告)日：2023-07-13
申请号：US18151538
申请日：2023-01-09
Applicant: ROHM Co., LTD.
Inventor： Adrian Joita , Toru TAKUMA , Shuntaro Takahashi
Abstract: Disclosed herein is a clamper including a current source that is connected between an external electrode and an internal node and generates a predetermined constant current, a diode having an anode connected to the internal node, and a current mirror that generates a second current corresponding to a first current flowing via the diode and draws the second current from the internal node to a reference voltage node.
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公开(公告)号：US11637420B2
公开(公告)日：2023-04-25
申请号：US17503907
申请日：2021-10-18
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Naoki Takahashi , Shuntaro Takahashi
Abstract: In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit has: a threshold value generation unit that, in accordance with a threshold value control signal, switches between setting an overcurrent detection threshold value to a first set value (∝ Iref) and a second set value (∝ Iset) lower than the first set value; an overcurrent detection unit that compares a sense signal in accordance with the current being monitored and the overcurrent detection value and generates an overcurrent protection signal; a reference value generation unit that generates a reference value (∝ Iset) in accordance with the seconds set value; a comparison unit that compares the sense signal and the reference value, and generates a comparison signal; and a threshold value control unit that monitors the comparison signal, and generates a threshold value control signal.
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公开(公告)号：US20220158436A1
公开(公告)日：2022-05-19
申请号：US17592807
申请日：2022-02-04
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Shuntaro Takahashi , Naoki Takahashi
Abstract: An overcurrent protection circuit includes a current control part configured to control conductance of a transistor so as to limit an output current flowing when the transistor is turned on to a predetermined upper limit or less, and a duty control part configured to forcibly turning on/off the transistor at a predetermined duty ratio when a temperature protection circuit detects a temperature abnormality in a state where the current control part limits the output current.
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4.发明申请OVERHEAT PROTECTION CIRCUIT, AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND VEHICLE THEREWITH 审中-公开超导保护电路和半导体集成电路设备及其车辆公开(公告)号：US20160336309A1
公开(公告)日：2016-11-17
申请号：US15147135
申请日：2016-05-05
Applicant: Rohm Co., Ltd.
Inventor： Hirofumi Yuki , Shuntaro Takahashi
IPC: H01L27/02 , H01L29/735 , H01L29/06 , H02H5/04 , H02H7/00
CPC classification number: H01L27/0259 , H01L29/0619 , H01L29/732 , H01L29/735 , H02H5/044 , H02H7/00
Abstract: An overheat protection circuit has an NPN transistor, a power terminal to which a supply voltage is applied, a transmission path by which the supply voltage is transmitted from the power terminal to the collector of the NPN transistor without passing through a current source, and an output voltage generator that generates an output voltage commensurate with the base-emitter voltage of the NPN transistor.
Abstract translation: 过热保护电路具有NPN晶体管，施加电源电压的电源端子，不经过电流源的电源电压从NPN晶体管的电源端子发送到集电极的传输路径， 输出电压发生器，其产生与NPN晶体管的基极 - 发射极电压相当的输出电压。
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公开(公告)号：US12283947B2
公开(公告)日：2025-04-22
申请号：US18468089
申请日：2023-09-15
Applicant: ROHM CO., LTD.
Inventor： Katsuaki Yamada , Shuntaro Takahashi , Muga Imamura
IPC: H03K17/687
Abstract: A switching device includes: an N-type semiconductor substrate; a power MISFET having the N-type semiconductor substrate as its drain; an input electrode receiving an input signal; a control circuit generating a gate control signal for the power MISFET according to the input signal; and a negative current prevention circuit provided between the input electrode and the control circuit. The negative current prevention circuit includes: a P-channel MISFET connected, with its drain toward the input electrode and its source and back gate toward the control circuit, between the input electrode and the control circuit, with its gate fed with a fixed potential, with the potential at its back gate separated from the potential of the N-type semiconductor substrate; and a diode connected, with its anode toward the input electrode and its cathode toward the control circuit, between the input electrode and the control circuit.
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Patent Agency Ranking
公开(公告)号：US12184054B2
公开(公告)日：2024-12-31
申请号：US18484721
申请日：2023-10-11
Applicant: ROHM CO., LTD.
Inventor： Toru Takuma , Naoki Takahashi , Shuntaro Takahashi
Abstract: In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit has: a threshold value generation unit that, in accordance with a threshold value control signal, switches between setting an overcurrent detection threshold value to a first set value (∝ Iref) and a second set value (∝ Iset) lower than the first set value; an overcurrent detection unit that compares a sense signal in accordance with the current being monitored and the overcurrent detection value and generates an overcurrent protection signal; a reference value generation unit that generates a reference value (∝ Iset) in accordance with the seconds set value; a comparison unit that compares the sense signal and the reference value, and generates a comparison signal; and a threshold value control unit that monitors the comparison signal, and generates a threshold value control signal.
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公开(公告)号：US20230133872A1
公开(公告)日：2023-05-04
申请号：US18049731
申请日：2022-10-26
Applicant: ROHM Co., LTD.
Inventor： Toru TAKUMA , Adrian Joita , Shuntaro Takahashi
Abstract: Disclosed is a gate control circuit that generates a gate control signal of an output transistor connected between an application end of a power supply voltage and an application end of an output voltage. The gate control circuit includes a first current source connected between the application end of the power supply voltage and the application end of the output voltage, a second current source connected between an application end of a booster voltage and an application end of a reference voltage, the booster voltage being raised to a voltage value higher than the power supply voltage in a steady state, an output stage that uses at least one of the first and second current sources to generate a gate charge current for charging a gate of the output transistor, and a controller that uses at least one of the first and second current sources according to the output voltage.
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公开(公告)号：US11128288B2
公开(公告)日：2021-09-21
申请号：US16726461
申请日：2019-12-24
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Shuntaro Takahashi
IPC: H03K17/0812 , B60R16/02 , H03K17/14 , H02H9/04 , H02H3/087 , H02H1/00 , H03K17/687
Abstract: A switching device has, for example, a first terminal configured to be connected to an application node for a first voltage, a second terminal configured to be connected to the first end of a load, a third terminal configured to be connected to the second end of the load and to an application node for a second voltage, a switching element configured to be connected between the first and second terminals, a first active clamper configured to limit the output voltage at the second terminal with reference to the first voltage in a first state, and a second active clamper configured to limit the output voltage with reference to the second voltage in a second state different from the first state.
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公开(公告)号：US20180302083A1
公开(公告)日：2018-10-18
申请号：US15768658
申请日：2016-09-26
Applicant: Rohm Co., Ltd.
Inventor： Shuntaro Takahashi
IPC: H03K17/687 , H02M1/08
Abstract: This switch drive circuit drives a switch element. The switch drive circuit is provided with a signal input terminal, a disconnect circuit and a connect circuit. A control signal is input into the signal input terminal. The disconnect circuit includes a first switch which switches connection/disconnection of a line connecting the signal input terminal to a control terminal of the switch element, and when the switch element is to be turned off, the disconnect circuit performs a disconnection operation to disconnect the line using the first switch. The connect circuit includes a second switch which switches connection/disconnection between a certain point on the line, positioned on the control terminal side of the first switch, and a reference potential point, and when the switch element is to be turned off, the connect circuit performs a connection operation to connect the certain point to the reference potential point using the second switch.
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公开(公告)号：US11843235B2
公开(公告)日：2023-12-12
申请号：US18181064
申请日：2023-03-09
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Naoki Takahashi , Shuntaro Takahashi
CPC classification number: H02H1/0007 , B60R16/02 , B60R16/03 , H02H3/087 , H02H3/093 , H02H7/20 , H02H7/205
Abstract: In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit has: a threshold value generation unit that, in accordance with a threshold value control signal, switches between setting an overcurrent detection threshold value to a first set value (∝ Iref) and a second set value (∝ Iset) lower than the first set value; an overcurrent detection unit that compares a sense signal in accordance with the current being monitored and the overcurrent detection value and generates an overcurrent protection signal; a reference value generation unit that generates a reference value (∝ Iset) in accordance with the seconds set value; a comparison unit that compares the sense signal and the reference value, and generates a comparison signal; and a threshold value control unit that monitors the comparison signal, and generates a threshold value control signal.
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