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公开(公告)号：US20190123541A1
公开(公告)日：2019-04-25
申请号：US16088934
申请日：2017-03-03
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：US20250070543A1
公开(公告)日：2025-02-27
申请号：US18943172
申请日：2024-11-11
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：US12166343B2
公开(公告)日：2024-12-10
申请号：US17785172
申请日：2020-12-17
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma
IPC: H02H7/22
Abstract: An overcurrent protection circuit includes a hiccup controller which is configured to hiccup-drive a switching element such that an on-period and an off-period alternate. The hiccup controller controls at least one of the on- and off-period according to a temperature sense signal. The temperature sense signal can be generated by detecting at least one of temperature of the switching element and a difference in temperature between the switching element and another element. When at least one of temperature of the switching element and the difference in temperature between the switching element and the other element is higher than a predetermined threshold value, the hiccup controller can reduce the on-period ton and increase the off-period.
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公开(公告)号：US20240113707A1
公开(公告)日：2024-04-04
申请号：US18532807
申请日：2023-12-07
Applicant: Rohm Co., Ltd.
Inventor： Toru Takuma
IPC: H03K17/082 , B60R16/03 , G01K7/01 , G01K7/16 , H02H3/08 , H02H5/04 , H02H6/00 , H02M3/156 , H03K17/16
CPC classification number: H03K17/0828 , B60R16/03 , G01K7/01 , G01K7/16 , H02H3/08 , H02H5/04 , H02H6/00 , H02M3/156 , H03K17/168
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：US20240039268A1
公开(公告)日：2024-02-01
申请号：US18484721
申请日：2023-10-11
Applicant: ROHM CO., LTD.
Inventor： Toru Takuma , Naoki Takahashi , Shuntaro Takahashi
CPC classification number: H02H1/0007 , H02H3/093 , B60R16/02 , H02H3/087 , H02H7/20 , B60R16/03 , 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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Patent Agency Ranking
公开(公告)号：US11581887B2
公开(公告)日：2023-02-14
申请号：US17197312
申请日：2021-03-10
Applicant: ROHM Co., LTD.
Inventor： Toru Takuma
IPC: H03K17/082 , H02H9/02 , 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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公开(公告)号：US11183829B2
公开(公告)日：2021-11-23
申请号：US17007662
申请日：2020-08-31
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：US10790657B2
公开(公告)日：2020-09-29
申请号：US16088934
申请日：2017-03-03
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：US20200251894A1
公开(公告)日：2020-08-06
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：US10658831B2
公开(公告)日：2020-05-19
申请号：US15672958
申请日：2017-08-09
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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