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公开(公告)号：US12224654B2
公开(公告)日：2025-02-11
申请号：US17917661
申请日：2021-04-06
Applicant: Rohm Co., Ltd.
Inventor： Tsuyoshi Fukura , Daiki Yanagishima , Akio Sasabe
IPC: H02M1/08 , H02M1/00 , H03K19/0175
Abstract: A pulse receiving circuit constituting a signal transmission device includes a first pulse detector that receives a differential input between a first reception pulse signal, i.e. an internal signal at a secondary winding of a first transformer and a second reception pulse signal, i.e. an internal signal at a secondary winding of a second transformer; a second pulse detector that receives the differential input between the first reception pulse signal and the second reception pulse signal with input polarity reversed to that of the first pulse detector; and a logic unit that generates a reception pulse signal based on output signals of the first and second pulse detectors, respectively.
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公开(公告)号：US12143100B2
公开(公告)日：2024-11-12
申请号：US18250035
申请日：2021-10-21
Applicant: ROHM CO., LTD.
Inventor： Masato Nishinouchi , Akio Sasabe , Takeshi Kikuchi
Abstract: A signal transmission device includes a capacitor having a first capacitor element and a second capacitor element connected in parallel such that electrodes of different polarities are connected together between them, and transmits an analog signal in a form converted into a pulse signal by use of a triangular-wave signal generated through charging and discharging of the capacitor.
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公开(公告)号：US12034437B2
公开(公告)日：2024-07-09
申请号：US18024086
申请日：2021-09-16
Applicant: ROHM CO., LTD.
Inventor： Takeshi Kikuchi , Masato Nishinouchi , Akio Sasabe , Daiki Yanagishima
IPC: H02P29/024 , H03K17/18
CPC classification number: H03K17/18 , H02P29/0241
Abstract: A signal transmission device that transmits a driving signal for a power transistor from a primary circuit system to a secondary circuit system while isolating between the primary and secondary circuit systems includes: a first fault detection circuit configured to detect a fault in the primary circuit system; a second fault detection circuit configured to detect a fault in the secondary circuit system; a first signal transmission path configured to transmit the result of detection by the second fault detection circuit from the secondary circuit system to the primary circuit system while isolating between the primary and secondary circuit systems; and a self-test circuit configured to perform a self-test on each of the first fault detection circuit, the second fault detection circuit, and the first signal transmission path.
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公开(公告)号：US12284060B2
公开(公告)日：2025-04-22
申请号：US18022807
申请日：2021-09-15
Applicant: ROHM CO., LTD.
Inventor： Takeshi Kikuchi , Masato Nishinouchi , Akio Sasabe , Daiki Yanagishima
IPC: H03K17/567 , H02M1/08 , H03K17/691 , H03K19/173 , H04L25/02
Abstract: A signal transmission device transmits a driving signal for a gate-driving transistor between a primary circuit system and a secondary circuit system while isolating between the primary and secondary circuit systems. The signal transmission device includes: a first external terminal configured such that the ground terminal of the secondary circuit system is connected to it; a second external terminal configured such that the terminal voltage at it varies according to whether the first external terminal is in an open state; and an open detection circuit configured to monitor the terminal voltage at the second external terminal to perform open detection for the first external terminal.
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Patent Agency Ranking
公开(公告)号：US20130279047A1
公开(公告)日：2013-10-24
申请号：US13903729
申请日：2013-05-28
Applicant: Rohm Co., Ltd.
Inventor： Motohiro Ando , Akio Sasabe
IPC: H02H9/02
CPC classification number: H02H9/025 , H03K17/0822 , H03K17/166
Abstract: The load drive device of the present invention comprises a load drive unit for switching on/off output current that flows to an inductive load; and an overcurrent protection circuit for detecting whether the output current is in an overcurrent state, wherein the load drive unit has an output transistor connected to one end of the inductive load; and a pre-driver for generating a control signal of the output transistor in accordance with an input signal, and the pre-driver has a first drive unit for switching on/off the output transistor during normal operation; and a second drive unit for switching off the output transistor more slowly than the first drive unit during overcurrent protection operation.
Abstract translation: 本发明的负载驱动装置包括负载驱动单元，用于接通/关闭流向电感负载的输出电流; 以及过电流保护电路，用于检测输出电流是否处于过电流状态，其中所述负载驱动单元具有连接到所述电感性负载的一端的输出晶体管; 以及用于根据输入信号产生输出晶体管的控制信号的预驱动器，并且所述预驱动器具有用于在正常操作期间接通/关断所述输出晶体管的第一驱动单元; 以及第二驱动单元，用于在过电流保护操作期间比第一驱动单元更慢地关断输出晶体管。
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公开(公告)号：US12255642B2
公开(公告)日：2025-03-18
申请号：US18006105
申请日：2021-05-25
Applicant: ROHM CO., LTD.
Inventor： Daiki Yanagishima , Akio Sasabe
IPC: H03K17/691 , H02M3/07 , H02M3/335 , H03K19/0175
Abstract: A signal transmission device 100 includes an isolated signal transmission circuit 10 configured to transmit a pulse signal from a primary circuit system 1p via a first isolating element ISO1 to a secondary circuit system 1s, and an isolated power supply control circuit 20 which serves as a controlling agent of an isolation-type power supply that generates a second supply voltage Vcc2 for the secondary circuit system 1s from a first supply voltage Vcc1 for the primary circuit system 1p and which transmits an output feedback signal of the isolation-type power supply from the secondary circuit system 1s via a second isolating element ISO2 to the primary circuit system 1p.
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公开(公告)号：US11747845B2
公开(公告)日：2023-09-05
申请号：US17913632
申请日：2021-02-08
Applicant: ROHM CO., LTD.
Inventor： Akio Sasabe
Abstract: A mirror clamp circuit includes a comparator having a first input terminal connectable to a first control terminal of a transistor having the first control terminal connected to the other terminal of a resistor of which one terminal is fed with an output voltage and a first terminal fed with a reference potential and a second input terminal fed with a reference voltage, a transistor switch having a second control terminal fed with a control terminal voltage based on a comparison signal output from the comparator and inserted between the first control terminal and the reference potential, an OR circuit fed with a signal based on the control terminal voltage and the output voltage, and a current feeder configured to change the amount of current fed to the comparator based on the output of the OR circuit.
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公开(公告)号：US09270111B2
公开(公告)日：2016-02-23
申请号：US13903729
申请日：2013-05-28
Applicant: Rohm Co., Ltd.
Inventor： Motohiro Ando , Akio Sasabe
IPC: H02H9/02 , H03K17/082 , H03K17/16
CPC classification number: H02H9/025 , H03K17/0822 , H03K17/166
Abstract: The load drive device of the present invention comprises a load drive unit for switching on/off output current that flows to an inductive load; and an overcurrent protection circuit for detecting whether the output current is in an overcurrent state, wherein the load drive unit has an output transistor connected to one end of the inductive load; and a pre-driver for generating a control signal of the output transistor in accordance with an input signal, and the pre-driver has a first drive unit for switching on/off the output transistor during normal operation; and a second drive unit for switching off the output transistor more slowly than the first drive unit during overcurrent protection operation.
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公开(公告)号：US09088444B2
公开(公告)日：2015-07-21
申请号：US14297878
申请日：2014-06-06
Applicant: Rohm Co., Ltd.
Inventor： Akio Sasabe , Hirotaka Takihara , Makoto Ikenaga , Toshiyuki Ishikawa
IPC: H03K19/0175 , H04L25/02 , H03K19/16
CPC classification number: H04L25/0274 , H03K19/16
Abstract: A signal-transferring device having a first circuit and a second circuit that operate on different ground references, and a third circuit for transferring signals while providing insulation between the first circuit and the second circuit. The second circuit switches a logic level of an output signal in accordance with the logic level of an input signal notified by the first circuit, and notifies the first circuit about the logic level of the output signal. The first circuit notifies the second circuit about the logic level of the input signal not only when the logic level of the input signal has been switched, but also when the logic level of the output signal notified by the second circuit does not match the logic level of the input signal.
Abstract translation: 一种具有在不同接地基准上工作的第一电路和第二电路的信号传送装置，以及用于在第一电路和第二电路之间提供绝缘的同时传送信号的第三电路。 第二电路根据由第一电路通知的输入信号的逻辑电平切换输出信号的逻辑电平，并将第一电路通知输出信号的逻辑电平。 第一电路不仅在输入信号的逻辑电平已被切换时通知第二电路关于输入信号的逻辑电平，而且当第二电路通知的输出信号的逻辑电平与逻辑电平不匹配时， 的输入信号。
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