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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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公开(公告)号：US10692774B2
公开(公告)日：2020-06-23
申请号：US16064682
申请日：2016-10-31
Applicant: Rohm Co., Ltd.
Inventor： Hirofumi Yuki , Shuntaro Takahashi , Hiroshi Furutani
IPC: H01L27/092 , H01L29/78 , H01L27/06 , H01L27/088 , H01L21/8234 , H03K17/08 , H01L21/8238
Abstract: This semiconductor device comprises: an n-type semiconductor substrate which is connected to an output terminal; a first p-type well which is formed in the n-type semiconductor substrate; a first n-type semiconductor region which is formed in the first p-type well and is connected to a control terminal; and a potential separation part which is connected between the first p-type well and a ground terminal. The potential separation part sets the first p-type well and the ground terminal to a same potential when the output terminal is held at a higher potential than the ground terminal, and sets the first p-type well and the output terminal to a same potential when the output terminal is held at a lower potential than the ground terminal.
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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：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：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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30.发明授权公开(公告)号：US10366977B2
公开(公告)日：2019-07-30
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
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.
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