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公开(公告)号：US12224738B2
公开(公告)日：2025-02-11
申请号：US18532807
申请日：2023-12-07
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma
IPC: H02H3/08 , B60R16/03 , G01K7/01 , G01K7/16 , H02H5/04 , H02H6/00 , H02H9/02 , H02M3/156 , H03K17/082 , H03K17/16
Abstract: An example switch device includes a switching element to connect/disconnect a current path from a power supply terminal to a ground terminal via a load, and an overcurrent protection circuit to limit output current flowing in the switching element to be an overcurrent limit value or less. When an output short circuit of the load is detected, the overcurrent protection circuit decreases the overcurrent limit value to be lower as a power supply voltage is higher. The overcurrent protection circuit includes a reference current generation portion that includes: a differential amplifier portion, an upper side current generation portion arranged to generate a predetermined an upper side current, a lower side current generation portion arranged to generate a lower side current, and a difference current generation portion arranged to output a difference current based on the lower side current and the upper side current, as the reference current.
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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：US20230102188A1
公开(公告)日：2023-03-30
申请号：US17902295
申请日：2022-09-02
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Adrian JOITA , Shuntaro TAKAHASHI
Abstract: An overcurrent protection circuit includes: a first transistor and a second transistor configured to form an amplifier input stage that receives input of a detection signal according to a monitoring target current; and a third transistor configured to form an amplifier output stage that generates a current output signal according to a difference between the detection signal and a reference signal and causes the current output signal to be negatively fed back to the amplifier input stage, wherein the monitoring target current is limited based on the current output signal output from the third transistor.
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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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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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Patent Agency Ranking
公开(公告)号：US20220109439A1
公开(公告)日：2022-04-07
申请号：US17552783
申请日：2021-12-16
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma
IPC: H03K17/082 , B60R16/03 , G01K7/16 , H03K17/16 , H02H6/00 , H02H3/08 , H02M3/156 , H02H5/04 , G01K7/01
Abstract: A switch device includes a switching element that connects/disconnects a current path from a power supply terminal to a ground terminal via a load, and an overcurrent protection circuit that limits output current flowing in the switching element to be an overcurrent limit value or less. When an output short circuit of the load is detected, the overcurrent protection circuit decreases the overcurrent limit value to be lower as a power supply voltage is higher. In addition, the switch device preferably includes a switching element that connects/disconnects a current path from a power supply terminal to a ground terminal via a load, an intermittent control unit that intermittently drives the switching element when an abnormality is detected, and an output voltage monitoring portion that disables the intermittent control unit until an output voltage applied to the load reaches its target value.
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公开(公告)号：US11239837B2
公开(公告)日：2022-02-01
申请号：US16218724
申请日：2018-12-13
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma
IPC: H02H3/08 , H02H9/02 , H03K17/082 , B60R16/03 , G01K7/16 , H03K17/16 , H02H6/00 , H02M3/156 , H02H5/04 , G01K7/01
Abstract: A switch device includes a switching element that connects/disconnects a current path from a power supply terminal to a ground terminal via a load, and an overcurrent protection circuit that limits output current flowing in the switching element to be an overcurrent limit value or less. When an output short circuit of the load is detected, the overcurrent protection circuit decreases the overcurrent limit value to be lower as a power supply voltage is higher. In addition, the switch device preferably includes a switching element that connects/disconnects a current path from a power supply terminal to a ground terminal via a load, an intermittent control unit that intermittently drives the switching element when an abnormality is detected, and an output voltage monitoring portion that disables the intermittent control unit until an output voltage applied to the load reaches its target value.
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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：US20170101052A1
公开(公告)日：2017-04-13
申请号：US15285831
申请日：2016-10-05
Applicant: ROHM CO., LTD.
Inventor： Kei Nagao , Toru Takahashi , Toru Takuma
CPC classification number: H05B33/0815 , B60Q3/14 , H05B33/0854 , Y02B20/347
Abstract: An apparatus for driving a light emitting device includes a constant current control circuit configured to control a current flowing through the light emitting device to be constant, and an extension circuit configured to generate a post-extending PWM signal obtained by extending a period of an input PWM signal having a first level. The constant current control circuit is turned on during the period of the post-extending PWM signal having the first level, and the constant current control circuit is turned off during a period of the post-extending PWM signal having a second level.
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公开(公告)号：US12074592B2
公开(公告)日：2024-08-27
申请号：US18154138
申请日：2023-01-13
Applicant: ROHM Co., LTD.
Inventor： Toru Takuma
IPC: H03K17/082 , H02H9/02 , B60R16/02
CPC classification number: H03K17/0822 , H02H9/025 , B60R16/02
Abstract: Disclosed herein is an overcurrent protection circuit configured to, upon detection of an output current that flows through a switch element reaching a first overcurrent limit value, reduce an overcurrent limit value for the output current from the first overcurrent limit value to a second overcurrent limit value smaller than the first overcurrent limit value.
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