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公开(公告)号：US20200306796A1
公开(公告)日：2020-10-01
申请号：US16816790
申请日：2020-03-12
Inventor： Eric Lindemann , Carl Lennart Ståhl , Emmanuel Marchais , John L. Melanson
Abstract: A system may include a signal generator configured to generate a raw waveform signal and a modeling subsystem configured to implement a discrete time model of an electromagnetic load that emulates a virtual electromagnetic load and further configured to modify the raw waveform signal to generate a waveform signal for driving the electromagnetic load by modifying the virtual electromagnetic load to have a desired characteristic, applying the discrete time model to the raw waveform signal to generate the waveform signal for driving the electromagnetic load, and applying the waveform signal to the electromagnetic load.
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公开(公告)号：US10476455B1
公开(公告)日：2019-11-12
申请号：US16057820
申请日：2018-08-08
Inventor： Paul Astrachan , Emmanuel Marchais , Lingli Zhang , Zhaohui He , Kyehyung Lee , Tejasvi Das , John L. Melanson
Abstract: A class-D amplifier system includes one or more pulse width modulation (PWM) output paths at least one of which includes one or more digital closed-loop PWM modulators (DCL-PWMM) in which at least one of the DCL_PWMM includes a digital integrator that provides an output value and receives a feedback value. The output value has an output resolution and the feedback value has a feedback resolution that is coarser than the output resolution. The output value is the sum of an integer multiple of the feedback resolution and a residue. Control logic decreases/increases the residue of the digital integrator toward an integer multiple of the feedback resolution over a plurality of clock cycles in response to a request to transition the class-D amplifier and forces an output of the DCL_PWMM to have an approximate 50% duty cycle after decreasing/increasing the residue over the plurality of clock cycles.
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公开(公告)号：US12276687B2
公开(公告)日：2025-04-15
申请号：US16870401
申请日：2020-05-08
Inventor： Emmanuel Marchais , Jon Hendrix
Abstract: A method may include selecting, based on a condition of an electromagnetic load, a selected measurement technique from a plurality of impedance measurement techniques for measuring an impedance of the electromagnetic load and performing the selected measurement technique to generate an estimate of the impedance of the electromagnetic load.
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公开(公告)号：US12035445B2
公开(公告)日：2024-07-09
申请号：US16556849
申请日：2019-08-30
Inventor： Emmanuel Marchais , Zhong You
Abstract: A resonant frequency tracker for driving an electromagnetic load with a driving signal may include a signal generator configured to generate a waveform signal at a driving frequency for driving an electromagnetic load and control circuitry. The control circuitry may be configured to, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receive a current signal representative of a current associated with the electromagnetic load and a second signal representative of a second quantity associated with the electromagnetic load, the second quantity comprising one of a voltage associated with the electromagnetic load or a back electromotive force of the electromagnetic load. The control circuitry may be further configured to calculate a phase difference between the current signal and the second signal, determine a frequency error of the waveform signal based on the phase difference, and control the driving frequency based on the frequency error.
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公开(公告)号：US11263877B2
公开(公告)日：2022-03-01
申请号：US16906576
申请日：2020-06-19
Inventor： Emmanuel Marchais , Eric Lindemann , Carl L. Ståhl
Abstract: A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load, the waveform signal comprising a first tone at a first driving frequency and a second tone at a second driving frequency. The method may also include during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may further include determining amplitude and phase information of the current signal responsive to the first tone and second tone, determining amplitude and phase information of the back electromotive force signal responsive to the first tone and second tone, and identifying parameters of the mechanical impedance of the electromagnetic load based on the amplitude and phase information of the current signal and the amplitude and phase information of the back electromotive force signal.
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Patent Agency Ranking
公开(公告)号：US11047890B2
公开(公告)日：2021-06-29
申请号：US16121259
申请日：2018-09-04
Inventor： Gautham S. Sivasankar , Tejasvi Das , Emmanuel Marchais , Amar Vellanki , Leyi Yin , John L. Melanson , Venugopal Choukinishi
IPC: G01R25/00 , H03D13/00 , H03F3/183 , H03G3/30 , H04R3/00 , H03G3/00 , G01R19/25 , G01R21/133 , G01R29/18 , G01R31/317 , G01R31/30 , G01R19/04
Abstract: A method of determining a phase misalignment between a first signal generated from a first signal path and a second signal generated from a second signal path may include obtaining multiple samples of the first signal proximate to when the first signal crosses zero wherein the first signal can be approximated as linear; obtaining multiple samples of the second signal proximate to when the second signal crosses zero wherein the first signal can be approximated as linear; based on the multiple samples of the first signal, approximating a first time at which the first signal crosses zero; based on the multiple samples of the second signal, approximating a second time at which the second signal crosses zero; and determining the phase misalignment between the first signal and the second signal based on a difference between the first time and the second time.
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公开(公告)号：US10826452B2
公开(公告)日：2020-11-03
申请号：US15887657
申请日：2018-02-02
Inventor： Eric J. King , Emmanuel Marchais
Abstract: A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage, a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, and a controller configured to, in a current-limiting mode of the controller, control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit, control the power amplifier by placing the power amplifier into a high-impedance mode during the current-limiting mode, and control state variables of a loop filter of the current mode control loop during the current-limiting mode.
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公开(公告)号：US20200342724A1
公开(公告)日：2020-10-29
申请号：US16841113
申请日：2020-04-06
Inventor： Emmanuel Marchais , Eric Lindemann , Carl L. Stahl
IPC: G08B6/00
Abstract: A system includes a sequencer that divides a reference waveform into reference sequences, a sequence adjuster, and a model that models non-linearities of a haptic rendering signal chain that includes a haptic transducer load and a driver to the load. For each reference sequence: the sequence adjuster transforms the reference sequence into a test sequence using one or more parameters (e.g., changes reference sequence amplitude and/or period), the model generates an output in response to the test sequence, an error signal is generated that measures a difference between the output and the reference sequence, and if the error signal is above a threshold the parameters are adjusted based on the error signal. These operations are repeated until the error signal is below the threshold in which case the test sequence becomes a selected sequence, which is then sent to the haptic rendering signal chain.
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公开(公告)号：US12295102B1
公开(公告)日：2025-05-06
申请号：US16299648
申请日：2019-03-12
Inventor： Zhong You , Emmanuel Marchais , Robert G. Kratsas , Anthony S. Doy
Abstract: A method may include forming an inductor comprising a plurality of inductor coils comprising a plurality of first inductor coils and a plurality of second inductor coils, each inductor coil comprising a spiraling wire of electrically-conductive material wherein the wire of electrically-conductive material is arranged substantially in a plane, wherein the plurality of first inductor coils and the plurality of second inductor coils are electrically coupled to one another and arranged with respect to one another such that within the plane, electrical current flowing through the inductor flows clockwise in the first inductor coils, within the plane, electrical current flowing through the inductor flows counterclockwise in the second inductor coils, each first inductor coil is adjacent to at least one second inductor coil, and each second inductor coil is adjacent to at least one first inductor coil.
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公开(公告)号：US11779956B2
公开(公告)日：2023-10-10
申请号：US17505199
申请日：2021-10-19
Inventor： Carl Lennart Ståhl , Emmanuel Marchais , Anthony Stephen Doy , John L. Melanson
CPC classification number: B06B1/0207 , G06F3/016
Abstract: Driver circuitry for driving an electromechanical load with a drive output signal, the driver circuitry comprising: a first control loop operable to control the drive output signal based on a drive input signal; and a second control loop operable to control the drive output signal based on a current flowing through and/or a voltage induced across the electromechanical load, wherein the second control loop is configured to have a lower latency than the first control loop, and to control the drive output signal to compensate for an impedance of the electromechanical load.
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