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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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公开(公告)号：US11289894B2
公开(公告)日：2022-03-29
申请号：US16856531
申请日：2020-04-23
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：US11128117B2
公开(公告)日：2021-09-21
申请号：US16042637
申请日：2018-07-23
Applicant: Rohm Co., Ltd.
Inventor： Naoki Takahashi , Shuntaro Takahashi , Toru Takuma
Abstract: A protection circuit includes: a high-side switch connected to a power terminal to which a predetermined power supply voltage VBB is supplied from an onboard battery; and an NMOS transistor MT1 connected to the high-side switch and configured to prevent an electrical conduction to the high-side switch when the onboard battery is reverse-connected to the power terminal, wherein a semiconductor integrated circuit is protected from a breakdown due to the reverse connection of the external power supply. A semiconductor integrated circuit apparatus includes the above-mentioned protection circuit configured to protect a semiconductor integrated circuit connected between the power terminal and the ground terminal, from an electro-static discharge breakdown. The protection circuit is connected to the clamp circuit unit inserted between the power terminal and the ground terminal, and is configured to protect the clamp circuit unit from a breakdown when the external power supply is reverse-connected.
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公开(公告)号：US09815401B2
公开(公告)日：2017-11-14
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：US12218124B2
公开(公告)日：2025-02-04
申请号：US18049731
申请日：2022-10-26
Applicant: ROHM Co., LTD.
Inventor： Toru Takuma , Adrian Joita , Shuntaro Takahashi
IPC: H03K17/06 , H01L27/02 , H01L29/78 , H02M3/156 , H03K17/082 , H03K19/0185 , H02M1/08
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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Patent Agency Ranking
公开(公告)号：US11994889B2
公开(公告)日：2024-05-28
申请号：US17655854
申请日：2022-03-22
Applicant: ROHM Co., LTD.
Inventor： Kenji Muraoka , Toru Takuma
IPC: G05F1/573 , B60R16/02 , H02H3/08 , H03K17/081 , H03K19/003
CPC classification number: G05F1/573 , B60R16/02 , H02H3/08 , H03K17/08104 , H03K19/00315
Abstract: Provided is an overcurrent protection circuit including an overcurrent detection unit configured to compare an output current flowing through a switch element and a predetermined overcurrent detection value to generate an overcurrent detection signal, an output activation detection unit configured to compare an output voltage and a predetermined threshold voltage to generate an output activation detection signal, a logic unit configured to combine the overcurrent detection signal and the output activation detection signal to generate a logic operation signal, and a diagnostic output unit configured to provide diagnostic output, the logic unit shifting the logic operation signal to a logic level of abnormal state when the overcurrent detection signal is shifted to a logic level of overcurrent detection state and holding the logic operation signal at that logic level, unless the output activation detection signal is shifted to a logic level of output activation state.
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公开(公告)号：US11876508B2
公开(公告)日：2024-01-16
申请号：US17552783
申请日：2021-12-16
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
CPC classification number: H03K17/0828 , B60R16/03 , G01K7/01 , G01K7/16 , H02H3/08 , H02H5/04 , H02H6/00 , H02M3/156 , H03K17/168
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：US11870236B2
公开(公告)日：2024-01-09
申请号：US17592807
申请日：2022-02-04
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Shuntaro Takahashi , Naoki Takahashi
CPC classification number: H02H3/08 , B60R16/02 , G05F1/573 , G06F1/305 , H02H9/02 , H02H9/025 , H03K19/00315 , H02H3/085 , H02H5/04 , H03K2017/0806
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：US20220352145A1
公开(公告)日：2022-11-03
申请号：US17623992
申请日：2020-07-22
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma , Katsuaki YAMADA
IPC: H01L27/02 , H01L29/66 , H01L29/866 , H03K17/08
Abstract: For example, a semiconductor device includes an output electrode to be connected to an inductive load, a ground electrode to be connected to a ground terminal, first and second transistors connected in parallel between the output and ground electrodes, an active clamp circuit connected to the gate of the first transistor, and a gate control circuit to control the gates of the first and second transistors to keep the first and second transistors on in a first operation state and off in a second operation state. After a transition from the first operation state to the second, before the active clamp circuit operates, the gate control circuit short-circuits between the gate and source of the second transistor.
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公开(公告)号：US20220037872A1
公开(公告)日：2022-02-03
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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