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    MOTOR DRIVER CIRCUIT, POSITIONING DEVICE USING IT, AND HARD DISK DEVICE
    1.
    发明公开
    MOTOR DRIVER CIRCUIT, POSITIONING DEVICE USING IT, AND HARD DISK DEVICE 审中-公开

    公开(公告)号：US20240313687A1

    公开(公告)日：2024-09-19

    申请号：US18599483

    申请日：2024-03-08

    申请人： ROHM Co., LTD.

    发明人： Hisashi SUGIE

    IPC分类号： H02P27/08 ,  G11B19/20 ,  H02P25/034 ,  H02P25/06

    CPC分类号： H02P27/085 ,  G11B19/20 ,  H02P25/034 ,  H02P25/06 ,  G11B2220/2516

    摘要： Provided is a motor driver circuit in which switching between a pulse width modulation mode and a linear mode is possible, the motor driver circuit including an output stage, a control circuit, a pulse width modulation drive circuit, and a linear drive circuit, in which the linear drive circuit includes a first current source driver, a first current sink driver, a second current source driver, a second current sink driver, and a differential amplifier, and current supply ability of the first current source driver and the second current source driver becomes higher than the current supply ability in normal times when a transition from the pulse width modulation mode to the linear mode is made.

    VOICE COIL MOTOR, METHOD AND DEVICE FOR CONTROLLING VOICE COIL MOTOR
    4.
    发明公开
    VOICE COIL MOTOR, METHOD AND DEVICE FOR CONTROLLING VOICE COIL MOTOR 审中-公开

    公开(公告)号：US20230402949A1

    公开(公告)日：2023-12-14

    申请号：US18449141

    申请日：2023-08-14

    申请人： GOERTEK INC.

    发明人： Yifan ZHANG ,  Pengbo Feng ,  Xueqiang Wang ,  Tao Han

    IPC分类号： H02P25/034 ,  H02P7/025

    CPC分类号： H02P25/034 ,  H02P7/025

    摘要： Disclosed are a voice coil motor, a method and a device for controlling the voice coil motor. The voice coil motor includes an outer coil module and an inner coil module inside the outer coil module, an air gap for the inner coil module to move is formed between the inner coil module and the outer coil module. The method includes: driving the outer coil module to generate an outer coil electromagnetic force; determining an inner coil current instruction according to an expectation force instruction and force feedback information sent by an executing mechanism of the voice coil motor; driving the inner coil module of the voice coil motor to generate an inner coil electromagnetic force according to the inner coil current instruction; and enabling the executing mechanism to generate a motor acting force according to the outer coil electromagnetic force and the inner coil electromagnetic force.

    SYSTEM AND METHOD FOR CONTROLLING MOTOR PARAMETERS, AND STORAGE MEDIUM
    6.
    发明申请
    SYSTEM AND METHOD FOR CONTROLLING MOTOR PARAMETERS, AND STORAGE MEDIUM 有权

    公开(公告)号：US20220271696A1

    公开(公告)日：2022-08-25

    申请号：US17668396

    申请日：2022-02-10

    申请人： AAC Acousitc Technologies (Shanghai)Co., Ltd.

    发明人： Zheng Xiang ,  Xiang Lu ,  Hanlin Deng ,  Liang Jiang

    IPC分类号： H02P23/00 ,  H02P25/034 ,  H02P25/06 ,  H02P23/14

    摘要： The present disclosure provides a system and a method for controlling motor parameters. The system includes a feedforward processing module performing a linear processing on a control signal according to parameters; a control object module including a DAC digital to analog converter, an amplifying circuit and an ADC analog to digital converter, a control signal processed by the feedforward processing module passing through the DAC digital to analog converter, and amplified by the amplifier circuit, and passing through the ADC analog to digital converter to obtain a voltage νc·m[n] and a current ic·m[n] across the motor; a system identification module including an LMS adaptive filter, a Least mean square filtering performed on an error signal εoei[n] between a measured current ic·m[n] and a prediction current ic·p[n], results of iteration feed back to the feedforward processing module, and the feedback results applied to the next data acquisitions and parameters calculations.

    Minimizing transducer settling time
    7.
    发明授权
    Minimizing transducer settling time 有权

    公开(公告)号：US11121661B2

    公开(公告)日：2021-09-14

    申请号：US16702929

    申请日：2019-12-04

    申请人： Cirrus Logic International Semiconductor Ltd.

    发明人： Marco Janko ,  Emmanuel Marchais ,  Carl Ståhl

    IPC分类号： H02P25/034 ,  G08B6/00

    摘要： A method for minimizing settling of a moving mass of an electromagnetic load may include determining a polarity and a magnitude of a velocity of the moving mass based on real time measurements of one or more parameters associated with the electromagnetic load and based on the polarity and the magnitude of the velocity, generating a braking signal to be applied to the moving mass that opposes the polarity of the velocity.

    Motor driver device, semiconductor device, and electronic device including the same
    8.
    发明授权
    Motor driver device, semiconductor device, and electronic device including the same 有权

    公开(公告)号：US11018607B2

    公开(公告)日：2021-05-25

    申请号：US16595726

    申请日：2019-10-08

    申请人： Rohm Co., Ltd.

    发明人： Hisashi Sugie

    IPC分类号： H02M1/12 ,  H02P6/182 ,  H02P25/03 ,  H02P6/28 ,  G11B25/04 ,  G11B19/28 ,  G11B19/20 ,  H02P25/034

    摘要： A motor driver device includes: a driver driving a motor by a driving method, wherein the driving method includes: a first driving method performing driving control of the motor based on zero cross timing of back electromotive force generated in a coil of a predetermined phase; and a second driving method performing driving control of the motor such that a first differential phase between zero cross timing of driving current flowing through the coil of the predetermined phase and zero cross timing of driving voltage applied to the coil of the predetermined phase coincides with predetermined first target phase, and wherein, even when the motor is being driven by the first driving method, the first differential phase is sequentially detected and, when transition from the first driving method to the second driving method occurs, the first differential phase detected immediately before the transition is set to the first target phase.

    METHODS AND APPARATUS FOR DRIVER CALIBRATION
    10.
    发明申请
    METHODS AND APPARATUS FOR DRIVER CALIBRATION 审中-公开

    公开(公告)号：US20200244230A1

    公开(公告)日：2020-07-30

    申请号：US16848240

    申请日：2020-04-14

    申请人： SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    发明人： Seiji TAKEUCHI

    IPC分类号： H03F1/30 ,  G05F3/24 ,  H03F3/45 ,  H02P25/034 ,  G03B13/36 ,  H03M1/10

    摘要： Various embodiments of the present technology may comprise methods and apparatus for driver calibration. The methods and apparatus may comprise various circuits and/or systems to minimize an offset output current (e.g., a drive current) due to an offset voltage in an operational amplifier. The methods and apparatus may comprise a current comparator circuit and a replica circuit that operate in conjunction with each other to monitor the drive current and provide a feedback signal, which is then used to adjust the drive current and improve the accuracy of the drive current.