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公开(公告)号：US11552567B2
公开(公告)日：2023-01-10
申请号：US17218992
申请日：2021-03-31
Inventor： Xin Zhao , Jun Yan , Xiaofan Fei , Mark May , John L. Melanson
Abstract: A single-inductor multiple output (SIMO) switched-power DC-DC converter for a class-D amplifier provides outputs that are symmetric about a common-mode input voltage of the amplifier, while remaining asymmetric about a return terminal of the amplifier and switching converter. The DC-DC converter includes an inductive element, a switching circuit that energizes the inductive element from an input source, and a control circuit that controls the switching circuit. The control circuit may have multiple switching modes, and in one of the multiple switching modes, the switching circuit may couple the inductive element between outputs of the converter so that stored energy produces a differential change between the voltages of the outputs. The control circuit may implement a first control loop that maintains a common mode voltage of the pair of outputs at a predetermined voltage independent of the individual voltages of the pair of outputs.
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公开(公告)号：US20220337181A1
公开(公告)日：2022-10-20
申请号：US17230789
申请日：2021-04-14
Inventor： Vamsikrishna Parupalli , Mark May , Eric B. Smith , Zhong You
Abstract: An electronic motor control system provides selectable linear and pulse-width modulated (PWM) operation without generating cross-over distortion. The system includes an output stage that has a pair of push-pull drivers each coupled to a terminal of the motor. The electronic motor control system also includes a pulse-width modulated (PWM) driver for providing pulse-width modulated drive signals to an input of the output stage when the pulse-width modulated mode is selected and a linear amplifier stage that provides a linear analog signal to the input of the output stage in linear mode, so that both drivers are operated to supply the current to the motor. In pulse-width modulated mode, a driver is selected for PWM operation, while the other driver is operated to supply a fixed voltage. A feedback control loop motor current and provides outputs to the pulse-width modulator the linear amplifier stage.
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Patent Agency Ranking
公开(公告)号：US10790749B2
公开(公告)日：2020-09-29
申请号：US15783744
申请日：2017-10-13
Inventor： Eric J. King , Eric B. Smith , Mark May
Abstract: A system may include a first capacitor, a first switched-mode power supply configured to deliver energy from a power source to the first capacitor at an output load of the first switched-mode power supply, a second capacitor having a capacitance larger than the first capacitor, a second switched-mode power supply configured to deliver energy from the power source or a second power source to the second capacitor and one or more switching elements coupled between the first capacitor and the second capacitor. The system may operate in a plurality of modes, including a first mode in which the first switched-mode power supply transfers energy to the first capacitor and the second capacitor, a second mode in which the second capacitor transfers energy to the first capacitor, and a third mode in which first switched-mode power supply transfers energy to the first capacitor and the second capacitor and the second switched-mode power supply transfers energy to the first capacitor and the second capacitor.
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公开(公告)号：US20180335458A1
公开(公告)日：2018-11-22
申请号：US15598582
申请日：2017-05-18
Inventor： John L. Melanson , Anindya Bhattacharya , Axel Thomsen , Eric Smith , Vamsikrishna Parupalli , Mark May , Johann Gaboriau , Junsong Li
CPC classification number: G01D5/24 , G01R27/2605
Abstract: Sensing electronics may be used to measure capacitance of components, such as speakers in mobile devices. A sensing circuit may include a charge-sense front end with sine wave excitation, an analog-to-digital conversion block, and a digital demodulator. The component being measured by the sensing electronics may be excited by a high-frequency sine wave excitation. The digitization of the output from the component may be performed using a bandpass filter synchronized with the excitation signal by centering the bandpass filter near (e.g., within 5% of) the frequency of the excitation signal.
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公开(公告)号：US11115046B2
公开(公告)日：2021-09-07
申请号：US16431276
申请日：2019-06-04
Inventor： Vamsikrishna Parupalli , Mark May , Saurabh Singh , Ramya Balasundaram , Mengde Wang , Eric B. Smith
Abstract: A system may include an output stage for driving a load at an output of the output stage, a pulse-width modulation mode path configured to pre-drive the output stage in a first mode of operation, a linear mode path configured to pre-drive the output stage in a second mode of operation and a loop filter coupled at its input to the output of the output stage and coupled at its output to both of the pulse-width modulation mode path and the linear mode path. The pulse-width modulation mode path and the linear mode path may be configured such that a first transfer function between the output of the loop filter and the output of the output stage is substantially equivalent to a second transfer function between the output of the loop filter and the output of the output stage.
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公开(公告)号：US11962261B2
公开(公告)日：2024-04-16
申请号：US17230789
申请日：2021-04-14
Inventor： Vamsikrishna Parupalli , Mark May , Eric B. Smith , Zhong You
CPC classification number: H02P7/29 , G02B7/09 , G02B27/646 , H02P7/04 , H02P7/292
Abstract: An electronic motor control system provides selectable linear and pulse-width modulated (PWM) operation without generating cross-over distortion. The system includes an output stage that has a pair of push-pull drivers each coupled to a terminal of the motor. The electronic motor control system also includes a pulse-width modulated (PWM) driver for providing pulse-width modulated drive signals to an input of the output stage when the pulse-width modulated mode is selected and a linear amplifier stage that provides a linear analog signal to the input of the output stage in linear mode, so that both drivers are operated to supply the current to the motor. In pulse-width modulated mode, a driver is selected for PWM operation, while the other driver is operated to supply a fixed voltage. A feedback control loop senses motor current and provides outputs to the pulse-width modulator and the linear amplifier stage.
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公开(公告)号：US20220329155A1
公开(公告)日：2022-10-13
申请号：US17218992
申请日：2021-03-31
Inventor： Xin Zhao , Jun Yan , Xiaofan Fei , Mark May , John L. Melanson
Abstract: A single-inductor multiple output (SIMO) switched-power DC-DC converter for a class-D amplifier provides outputs that are symmetric about a common-mode input voltage of the amplifier, while remaining asymmetric about a return terminal of the amplifier and switching converter. The DC-DC converter includes an inductive element, a switching circuit that energizes the inductive element from an input source, and a control circuit that controls the switching circuit. The control circuit may have multiple switching modes, and in one of the multiple switching modes, the switching circuit may couple the inductive element between outputs of the converter so that stored energy produces a differential change between the voltages of the outputs. The control circuit may implement a first control loop that maintains a common mode voltage of the pair of outputs at a predetermined voltage independent of the individual voltages of the pair of outputs.
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