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公开(公告)号：US12080327B2
公开(公告)日：2024-09-03
申请号：US18354797
申请日：2023-07-19
摘要： An embodiment method includes rectifying a back electromotive force of a spindle motor in a hard disk drive and energizing a voice coil motor in the hard disk drive using the rectified back electromotive force of the spindle motor via a voice coil motor power stage to retract a head of the hard disk drive to a park position. The head is retracted by moving the head towards the park position during a first retract phase and retaining the head in the park position during a second retract phase by applying a bias voltage to the voice coil motor power stage during a bias interval of the second retract phase. The method also includes producing a saturation signal indicative of onset of saturation in the voice coil motor power stage and controlling the bias voltage during the second retract phase.
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公开(公告)号：US09947350B1
公开(公告)日：2018-04-17
申请号：US15636426
申请日：2017-06-28
IPC分类号： G11B5/55
CPC分类号： G11B5/5534 , G11B5/5547 , G11B5/5565 , H02P6/182 , H02P25/028 , H02P25/034
摘要： A driver device coupled to a winding of an electro-mechanical actuator includes: a power stage driving the winding in a discontinuous mode by alternating conduction on-phases to off-phases, and a sensor circuit sensing a voltage across the winding in an off-phase, wherein, during such an off-phase the voltage across the winding includes a residual voltage which decays to zero. The power stage drives the winding from an on-phase to an off-phase by applying to the winding a reverse current pulse to invert the direction of flow of the current through the winding and produce an oscillation of the residual voltage, whereby the residual voltage includes a zero-crossing point after the current through the winding is exhausted. The sensor circuit senses the voltage across the winding at this zero-crossing point, whereby the voltage sensed across the winding at the zero-crossing point is indicative of the back electromotive force of the winding.
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公开(公告)号：US10892740B2
公开(公告)日：2021-01-12
申请号：US16240915
申请日：2019-01-07
摘要： A method includes receiving an input digital signal and applying the input digital signal to digital filter processing with a corner frequency to produce a filtered output digital signal. The digital filter processing includes a set of multiplication operations using a set of filter multiplication coefficients. The set of multiplication operations is performed by alternately using a first set of approximate multiplication coefficients and a second set of approximate multiplication coefficients different from the first set of approximate multiplication coefficients. The approximate multiplication coefficients in the first set of approximate multiplication coefficients and the second set of approximate multiplication coefficients approximate multiplication coefficients in the set of filter multiplication coefficients as a function of negative power-of-two values. The alternating of multiplication operations results in digital filter processing with average corner frequency approximating the corner frequency.
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公开(公告)号：US20190245521A1
公开(公告)日：2019-08-08
申请号：US16240915
申请日：2019-01-07
CPC分类号： H03H17/0227 , G06F7/523 , H03H17/0225 , H03H17/0248 , H03H17/04 , H03H2017/022
摘要： A method includes receiving an input digital signal and applying the input digital signal to digital filter processing with a corner frequency to produce a filtered output digital signal. The digital filter processing includes a set of multiplication operations using a set of filter multiplication coefficients. The set of multiplication operations is performed by alternately using a first set of approximate multiplication coefficients and a second set of approximate multiplication coefficients different from the first set of approximate multiplication coefficients. The approximate multiplication coefficients in the first set of approximate multiplication coefficients and the second set of approximate multiplication coefficients approximate multiplication coefficients in the set of filter multiplication coefficients as a function of negative power-of-two values. The alternating of multiplication operations results in digital filter processing with average corner frequency approximating the corner frequency.
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公开(公告)号：US20240038263A1
公开(公告)日：2024-02-01
申请号：US18354797
申请日：2023-07-19
摘要： An embodiment method includes rectifying a back electromotive force of a spindle motor in a hard disk drive and energizing a voice coil motor in the hard disk drive using the rectified back electromotive force of the spindle motor via a voice coil motor power stage to retract a head of the hard disk drive to a park position. The head is retracted by moving the head towards the park position during a first retract phase and retaining the head in the park position during a second retract phase by applying a bias voltage to the voice coil motor power stage during a bias interval of the second retract phase. The method also includes producing a saturation signal indicative of onset of saturation in the voice coil motor power stage and controlling the bias voltage during the second retract phase.
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公开(公告)号：US11841497B2
公开(公告)日：2023-12-12
申请号：US17109929
申请日：2020-12-02
CPC分类号： G02B26/0833 , G05B5/01 , G09G3/025 , H03G1/0005 , H04N9/3135
摘要： Disclosed herein is a control system for a projection system, including a first subtractor receiving an input drive signal and a feedback signal and generating a first difference signal therefrom, the feedback signal being indicative of position of a quasi static micromirror of the projection system. A type-2 compensator receives the first difference signal and generates therefrom a first output signal. A derivative based controller receives the feedback signal and generates therefrom a second output signal. A second subtractor receives the first and second output signals and generates a second difference signal therefrom. The second difference signal serves to control a mirror driver of the projection system. A higher order resonance equalization circuit receives a pre-output signal from an analog front end of the projection system that is indicative of position of the quasi static micromirror, and generates the feedback signal therefrom.
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公开(公告)号：US11652479B2
公开(公告)日：2023-05-16
申请号：US17659226
申请日：2022-04-14
IPC分类号： H03K17/687 , H02M3/157 , H02M1/00
CPC分类号： H03K17/6877 , H02M1/0025 , H02M3/157 , H03K17/6874
摘要： A method of controlling a half-bridge circuit includes receiving an analog feedback signal proportional to an output of the half-bridge circuit, comparing the received analog feedback signal with a threshold value, selecting a digital feedback signal based on a result of the comparing, comparing the digital feedback signal with a digital reference signal to generate a digital error signal, integrating the digital error signal to generate an integration error signal, downscaling the integral error signal to generate a downscaled integration signal, sampling the downscaled integration signal to generate a sampled integration signal, and generating pulsed signals from the sampled integration signal to provide an input to the half-bridge circuit.
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公开(公告)号：US11336280B2
公开(公告)日：2022-05-17
申请号：US17150156
申请日：2021-01-15
IPC分类号： H03K17/687 , H02M3/157 , H02M1/00
摘要： A half-bridge control circuit comprises an input terminal, an output terminal for providing a pulsed signal to a half-bridge driver circuit configured to drive two electronic switches connected between two supply terminals, and a feedback terminal for receiving a feedback signal indicative of the instantaneous voltage value at a switching node between the two electronic switches. A selector circuit provides a digital feedback signal. A subtractor generates an error signal by subtracting the digital feedback signal from the reference signal. An integrator generates an integration signal by integrating the value of the error signal. A down-scale circuit generates a reduced resolution integration signal by discarding one or more least significant bits of the integration signal. A sampling circuit generates a sampled integration signal by sampling the reduced resolution integration signal. A pulse generator circuit generates the pulsed signal as a function of the sampled integration signal.
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公开(公告)号：US20210226624A1
公开(公告)日：2021-07-22
申请号：US17150156
申请日：2021-01-15
IPC分类号： H03K17/687
摘要： An embodiment half-bridge control circuit comprises an input terminal, an output terminal for providing a pulsed signal to a half-bridge driver circuit configured to drive two electronic switches connected between two supply terminals, and a feedback terminal for receiving a feedback signal indicative of the instantaneous voltage value at a switching node between the two electronic switches. A selector circuit provides a digital feedback signal. A subtractor generates an error signal by subtracting the digital feedback signal from the reference signal. An integrator generates an integration signal by integrating the value of the error signal. A down-scale circuit generates a reduced resolution integration signal by discarding one or more least significant bits of the integration signal. A sampling circuit generates a sampled integration signal by sampling the reduced resolution integration signal. A pulse generator circuit generates the pulsed signal as a function of the sampled integration signal.
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10.发明授权公开(公告)号：US09385639B2
公开(公告)日：2016-07-05
申请号：US14284636
申请日：2014-05-22
发明人： Giuseppe Maiocchi
CPC分类号： H02P6/28 , H02P6/085 , H02P6/182 , H02P2203/00 , H02P2207/05
摘要： A switching controller of a poly-phase electric motor may generate, in a fully digital manner, a replica of the phase current and/or of the phase (star) voltage of one or more windings of the motor. The switching controller may use digital signals already available for driving the motor to reconstruct a replica of the phase current or the phase voltage, and thereby avoid the need for dedicated analog components for phase current or phase voltage determination.
摘要翻译： 多相电动机的开关控制器可以以完全数字方式产生电动机的一个或多个绕组的相电流和/或相位（星形）电压的复制品。 开关控制器可以使用已经可用于驱动电动机的数字信号来重建相电流或相电压的复制品，从而避免对用于相电流或相电压确定的专用模拟组件的需要。
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