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公开(公告)号：US11949321B2
公开(公告)日：2024-04-02
申请号：US17510707
申请日：2021-10-26
Inventor： Vamsikrishna Parupalli , Nishant Jain , Mengde Wang
CPC classification number: H02M1/0045 , H02M1/088 , H02P27/08
Abstract: An electronic control system provides selectable linear and pulse-width modulated (PWM) operation with reduced disruption when changing from PWM operation to linear operation. The system includes an output stage that has a push-pull driver coupled to the load, which may be a motor, a haptic device, or other device requiring current-mode control. The system also includes a pulse-width modulated (PWM) driver for providing pulse-width modulated drive signals to gates of the transistors of the output stage when a pulse-width modulated mode is selected, and a linear amplifier stage that provides a linear analog signal to the gates of the transistors when a linear mode is selected. A pre-charging circuit pre-charges the gates during a pre-charge cycle that is initiated when the operating mode changes from the PWM operating more to the linear operating mode.
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公开(公告)号：US11940827B1
公开(公告)日：2024-03-26
申请号：US18078292
申请日：2022-12-09
Inventor： Stewart G. Kenly , Vamsikrishna Parupalli , Nishant Jain , Eric B. Smith
Abstract: An electronic control system provides selectable path operation, such as linear and pulse-width modulated (PWM) operation and provides path transition management to improve operation. The system supplies a current or a voltage to a load in response to an input signal or value and includes an output driver, and multiple selectable control paths. The system includes a control circuit that selects between the first control path and the second control path in response to a path selection indication to drive the output driver. The system may include an evaluator that determines the path selection indication in conformity with an amplitude and a slew rate of the input. One or all of the control paths may have a response time to changes in the input signal or value, and the control circuit may delay switching from the second control path to the first control path to compensate for the response time.
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公开(公告)号：US20230128810A1
公开(公告)日：2023-04-27
申请号：US17510707
申请日：2021-10-26
Inventor： Vamsikrishna Parupalli , Nishant Jain , Mengde Wang
Abstract: An electronic control system provides selectable linear and pulse-width modulated (PWM) operation with reduced disruption when changing from PWM operation to linear operation. The system includes an output stage that has a push-pull driver coupled to the load, which may be a motor, a haptic device, or other device requiring current-mode control. The system also includes a pulse-width modulated (PWM) driver for providing pulse-width modulated drive signals to gates of the transistors of the output stage when a pulse-width modulated mode is selected, and a linear amplifier stage that provides a linear analog signal to the gates of the transistors when a linear mode is selected. A pre-charging circuit pre-charges the gates during a pre-charge cycle that is initiated when the operating mode changes from the PWM operating more to the linear operating mode.
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公开(公告)号：US10476444B1
公开(公告)日：2019-11-12
申请号：US16142498
申请日：2018-09-26
Inventor： Tejasvi Das , Xin Zhao , Ku He , Nishant Jain , Lei Zhu , Xiaofan Fei
Abstract: A system may include a plurality of playback paths comprising an open-loop playback path configured to drive an output load and a closed-loop playback path. The closed-loop playback path may include an outer feedback loop comprising one or more integrators, a quantizer, and an output driver for driving the output load, the outer feedback loop having an outer loop feedback gain and an inner feedback loop comprising the one or more integrators and the quantizer and excluding the output driver, wherein the inner feedback loop has a variable inner loop feedback gain which is adjustable to match the outer loop feedback gain.
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