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公开(公告)号：US11923834B2
公开(公告)日：2024-03-05
申请号：US17829596
申请日：2022-06-01
Applicant: Rohm Co., Ltd.
Inventor： Tetsuo Yamato
IPC: H03K17/081 , H03K17/08 , H03K17/14 , H03K17/687
CPC classification number: H03K17/08104 , H03K17/145 , H03K17/6871 , H03K2017/0806
Abstract: A switch device includes an output transistor, an overcurrent protection circuit configured to be capable of performing an overcurrent protection operation in which magnitude of target current flowing in the output transistor is limited to a predetermined upper limit current value or less, and a control circuit configured to be capable of controlling a state of the output transistor and capable of changing the upper limit current value among a plurality of current values including a predetermined first current value and a predetermined second current value less than the first current value. The control circuit can limit the magnitude of the target current to the first current value or less in response to the magnitude of the target current reaching the first current value, and then change the upper limit current value to the second current value.
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公开(公告)号：US20210044222A1
公开(公告)日：2021-02-11
申请号：US16943669
申请日：2020-07-30
Applicant: ROHM CO., LTD.
Inventor： Tetsuo Yamato , Noboru Takizawa
Abstract: The present invention provides a motor driver and a motor driving system capable of suppressing power consumption when a motor is in a brake state. The motor driver of the present invention includes: a half-bridge power output section, including a high-side transistor and a low-side transistor; a high-side driving circuit, driving the high-side transistor; and a control portion. When switching to a brake mode, the low-side transistor is turned on and the control portion turns off the high-side driving circuit.
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公开(公告)号：US20240213977A1
公开(公告)日：2024-06-27
申请号：US18393494
申请日：2023-12-21
Applicant: ROHM CO., LTD.
Inventor： Tetsuo Yamato
IPC: H03K17/0812 , H03K17/18
CPC classification number: H03K17/08122 , H03K17/18 , B60R16/02 , H03K2217/0027 , H03K2217/0072
Abstract: The present disclosure provides a load driving device. The load driving device includes a load, a resistor configured to be connected in parallel to the load, and a switch device. The switch device includes an output terminal, a ground terminal, a first switch element and an abnormality detection circuit. The output terminal is configured to connect the load and the resistor. The ground terminal is configured to connect to a ground potential. The first switch element is configured to be connected between the output terminal and the ground terminal. The abnormality detection circuit is configured to distinguish between a load open at the output terminal and a ground fault at the output terminal based on a magnitude relationship between an output current flowing through the first switch element, a first threshold value and a second threshold value greater than the first threshold value.
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公开(公告)号：US10516362B2
公开(公告)日：2019-12-24
申请号：US15460851
申请日：2017-03-16
Applicant: Rohm Co., Ltd.
Inventor： Tetsuo Yamato
IPC: H02P29/024 , H02P29/032 , B60L3/00 , H02P6/16
Abstract: A motor driving device includes an abnormality detecting portion arranged to detect an abnormality of one of a plurality of position detection signals based on outputs from a plurality of Hall sensors arranged to detect a rotor position of a brushless DC motor, a measuring portion arranged to measure time between neighboring edges of a normal position detection signal when the abnormality detecting portion detects an abnormality, and a drive control portion arranged to control a drive signal for driving the brushless DC motor based on a latest time measurement result of the measuring portion.
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公开(公告)号：US11539312B2
公开(公告)日：2022-12-27
申请号：US16943669
申请日：2020-07-30
Applicant: ROHM CO., LTD.
Inventor： Tetsuo Yamato , Noboru Takizawa
Abstract: The present invention provides a motor driver and a motor driving system capable of suppressing power consumption when a motor is in a brake state. The motor driver of the present invention includes: a half-bridge power output section, including a high-side transistor and a low-side transistor; a high-side driving circuit, driving the high-side transistor; and a control portion. When switching to a brake mode, the low-side transistor is turned on and the control portion turns off the high-side driving circuit.
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Patent Agency Ranking
公开(公告)号：US09294020B2
公开(公告)日：2016-03-22
申请号：US14450438
申请日：2014-08-04
Applicant: Rohm Co., Ltd.
Inventor： Tetsuo Yamato , Noboru Takizawa
Abstract: A motor driving device includes a logic unit configured to control an electrical conduction of a motor, a reference clock signal generating unit configured to generate a reference clock signal based on a rotational speed indication signal, a rotational speed signal generating unit configured to generate a rotational speed signal based on a rotational speed of the motor, and a rotational speed feedback control unit configured to receive the reference clock signal and the rotational speed signal and control the logic unit so that the rotational speed of the motor reaches a target value. The rotational speed feedback control unit changes a feedback gain in response to the rotational speed signal.
Abstract translation: 一种电动机驱动装置，包括被配置为控制电动机的导通的逻辑单元，被配置为基于转速指示信号生成基准时钟信号的基准时钟信号生成部，转速信号生成部， 以及转速反馈控制单元，被配置为接收基准时钟信号和转速信号，并控制逻辑单元，使得电动机的转速达到目标值。 转速反馈控制单元响应于转速信号改变反馈增益。
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公开(公告)号：US09197149B2
公开(公告)日：2015-11-24
申请号：US14097762
申请日：2013-12-05
Applicant: Rohm Co., Ltd.
Inventor： Tetsuo Yamato , Noboru Takizawa
CPC classification number: H02P6/20 , H02P6/14 , H02P23/0027
Abstract: A motor drive apparatus comprises: a position signal generation portion that generates a position signal corresponding to a rotor position of a brushless DC motor; and a logic portion that when starting the brushless DC motor, disposes a non-energizing period immediately after starting forced commutation at a phase switchover timing corresponding to a predetermined forced commutation frequency and performs energizing control of the brushless DC motor such that usual commutation is started at a phase switchover timing corresponding to the position signal that is generated during an inertial rotation of the rotor.
Abstract translation: 电动机驱动装置包括：位置信号生成部，生成与无刷直流电动机的转子位置对应的位置信号; 以及逻辑部分，当启动无刷直流电动机时，在与预定的强制换流频率相对应的相位切换定时开始强制换向之后立即执行非通电时段，并执行无刷直流电动机的通电控制，使得通常的换向开始 在与转子的惯性旋转期间产生的位置信号相对应的相位切换定时。
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公开(公告)号：US20230125777A1
公开(公告)日：2023-04-27
申请号：US18047441
申请日：2022-10-18
Applicant: ROHM Co., LTD.
Inventor： Tetsuo Yamato , Shuntaro Takahashi , Kazuki Okuyama
IPC: H03K17/687
Abstract: Disclosed is a switch device including a first terminal, a second terminal, a third terminal, a switch element disposed between the first terminal and the second terminal, a control line that reaches a control end of the switch element from the third terminal, a first circuit block that is disposed on the control line and is configured to drive the switch element according to a control signal supplied to the third terminal, at least one second circuit block, each second circuit block being connected to a corresponding one of branch power supply lines that branch from the control line, a first resistor disposed between the third terminal and the first circuit block, and at least one second resistor, each second resistor being disposed on a corresponding one of the branch power supply lines.
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公开(公告)号：US10992294B2
公开(公告)日：2021-04-27
申请号：US16583908
申请日：2019-09-26
Applicant: Rohm Co., Ltd.
Inventor： Tetsuo Yamato , Noboru Takizawa
Abstract: The present disclosure relates to a driver device, which can drive a load in high temperatures. In a driver IC which drives a motor by switch-driving four output transistors, a gate driving circuit is configured to render a slew rate of a gate voltage of each output transistor to be adjustable at multiple steps while the output transistor is switching. Although a predetermined rate is set to be the slew rate of the gate voltage in a normal state, the slew rate is increased at high temperatures.
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公开(公告)号：US12119813B2
公开(公告)日：2024-10-15
申请号：US18047441
申请日：2022-10-18
Applicant: ROHM Co., LTD.
Inventor： Tetsuo Yamato , Shuntaro Takahashi , Kazuki Okuyama
IPC: H03K17/687 , H01H47/00 , H01H47/04 , H01H47/32
CPC classification number: H03K17/687 , H03K2217/0063 , H03K2217/0072
Abstract: Disclosed is a switch device including a first terminal, a second terminal, a third terminal, a switch element disposed between the first terminal and the second terminal, a control line that reaches a control end of the switch element from the third terminal, a first circuit block that is disposed on the control line and is configured to drive the switch element according to a control signal supplied to the third terminal, at least one second circuit block, each second circuit block being connected to a corresponding one of branch power supply lines that branch from the control line, a first resistor disposed between the third terminal and the first circuit block, and at least one second resistor, each second resistor being disposed on a corresponding one of the branch power supply lines.
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