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公开(公告)号：US20230122151A1
公开(公告)日：2023-04-20
申请号：US17848550
申请日：2022-06-24
Inventor： Zhaohui HE , Neel PRAMANIK , Lingli ZHANG , Wei XU , Prashanth DRAKSHAPALLI
IPC: H03F3/45
Abstract: A method for calibrating a fully-differential input system may include determining a first voltage of a first node of the fully-differential input system, wherein the first node is coupled at the first node to a plurality of first resistors in a first star configuration, determining a second voltage of a second node of the fully-differential input system, wherein the second node is coupled at the second node to a plurality of second resistors in a second star configuration, each resistor of the plurality of second resistors corresponding to a respective resistor of the plurality of first resistors, and trimming individual resistances of the plurality of first resistors and the plurality of second resistors in order to maintain a difference of a first voltage at the first node and a second voltage of the second node at approximately zero.
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公开(公告)号：US20220376618A1
公开(公告)日：2022-11-24
申请号：US17678527
申请日：2022-02-23
Inventor： Yongjie CHENG , Lingli ZHANG , John L. MELANSON , Thomas H. HOFF , Eric J. KING , Zhaohui HE
Abstract: This application relates to methods and apparatus for driving a transducer. A transducer driver has a switch network is operable to selectively connect a driver output to any of a first set of at least three different switching voltages. which are, in use, maintained throughout a switching cycle of the driver apparatus. The switch network is also operable to selectively connect the driver output to flying capacitor driver. A controller is configured to control the switch network and flying capacitor driver to generate a drive signal at the driver output based on an input signal, wherein in one mode of operation the driver output is switched between two of the first set of switching voltages with a controlled duty cycle and in another mode of operation the driver output is connected to the flying capacitor driver which is switched between first and second states with a controlled duty cycle.
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公开(公告)号：US20230208303A1
公开(公告)日：2023-06-29
申请号：US18174106
申请日：2023-02-24
Inventor： Eric J. KING , Ajit SHARMA , Lingli ZHANG , Christian LARSEN , Graeme G. MACKAY
CPC classification number: H02M3/158 , H02M1/08 , H02M3/1584 , H02M1/008
Abstract: A system may include a power converter having a maximum allowable input power drawn from a power source, an energy storage element coupled to an output of the power converter at a top plate of the energy storage element, wherein the energy storage element is configured to store excess energy, and control circuitry configured to, when an input power of the power converter exceeds the maximum allowable input power, cause excess energy stored in the energy storage element to be consumed by circuitry coupled to the output of the power converter, and in order to maintain positive voltage headroom for the circuitry coupled to the output of the power converter, selectively couple a bottom plate of the energy storage element to the power source such that excess energy stored by the circuitry coupled to the output of the power converter is consumed from the energy storage device when the input power of the power converter exceeds the maximum allowable input power.
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公开(公告)号：US20230132510A1
公开(公告)日：2023-05-04
申请号：US17980146
申请日：2022-11-03
Inventor： John L. MELANSON , Lingli ZHANG , Paul M. ASTRACHAN , James KELTON
IPC: H03M1/06
Abstract: A digital-to-analog converter may include an integrator, an input network comprising a plurality of parallel taps, each member of the plurality of parallel taps having a signal delay such that at least two of the signal delays of the members of the plurality of parallel taps are different, and wherein each member of the plurality of parallel taps is coupled between an input of the digital-to-analog converter and an input of the integrator, and control circuitry configured to selectively enable and disable particular members of the plurality of parallel taps in order to program an effective input resistance of the input network to control an analog gain of the digital-to-analog converter, such that the control circuitry enables an even number of members at a time, with half of such enabled members in a first group and half of such enabled members in a second group.
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公开(公告)号：US20220341973A1
公开(公告)日：2022-10-27
申请号：US17236680
申请日：2021-04-21
Inventor： Yongjie CHENG , Ruoxin JIANG , Lingli ZHANG , John L. MELANSON
IPC: G01R19/10 , H03K17/687
Abstract: A system may include an output power stage driver comprising a plurality of parallel-coupled field-effect transistors and a current sensor comprising a sense field-effect transistor matched to a matched field-effect transistor of the plurality of parallel-coupled field-effect transistors and gate-coupled and source-coupled to the matched field-effect transistor. The current sensor may be configured to measure a reference voltage across the sense field-effect transistor, measure a sense voltage across the matched field-effect transistor, and determine a current through the output power stage driver based on a comparison of the reference voltage to the sense voltage.
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Patent Agency Ranking
公开(公告)号：US20220037908A1
公开(公告)日：2022-02-03
申请号：US17130443
申请日：2020-12-22
Inventor： Graeme G. MACKAY , Ajit SHARMA , Jason W. LAWRENCE , Lingli ZHANG
Abstract: A power delivery system may include a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter and control circuitry configured to monitor a first voltage derived from the power source, wherein the first voltage is indicative of a total power demanded by the power converter, and control a limit for a current supplied from the power source to the one or more loads based on comparison of the first voltage to a threshold voltage, wherein the threshold voltage is indicative of a point within a range of operation of the power converter at which the power converter delivers a maximum amount of power to the one or more loads.
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公开(公告)号：US20210126528A1
公开(公告)日：2021-04-29
申请号：US17075139
申请日：2020-10-20
Inventor： Eric J. KING , John L. MELANSON , Graeme G. MACKAY , Lingli ZHANG
Abstract: A battery management system configured to electrically couple to a battery may include a boost converter comprising a plurality of switches arranged to provide a boosted output voltage at an output of the boost converter from a source voltage of the battery and a bypass switch coupled between the battery and the output, wherein the battery management system is operable in a plurality of modes comprising a bypass mode wherein the source voltage is bypassed to the output and when the battery management system is in the bypass mode, at least one switch of the plurality of switches is enabled to increase a conductance between the battery and the output.
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公开(公告)号：US20210083578A1
公开(公告)日：2021-03-18
申请号：US16916395
申请日：2020-06-30
Inventor： Eric J. KING , Ajit SHARMA , Lingli ZHANG , Christian LARSEN , Graeme G. MACKAY
Abstract: A system may include a power converter having a maximum allowable input power drawn from a power source, an energy storage element coupled to an output of the power converter at a top plate of the energy storage element, wherein the energy storage element is configured to store excess energy, and control circuity configured to, when an input power of the power converter exceeds the maximum allowable input power, cause excess energy stored in the energy storage element to be consumed by circuitry coupled to the output of the power converter, and in order to maintain positive voltage headroom for the circuitry coupled to the output of the power converter, selectively couple a bottom plate of the energy storage element to the power source such that excess energy stored by the circuitry coupled to the output of the power converter is consumed from the energy storage device when the input power of the power converter exceeds the maximum allowable input power.
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公开(公告)号：US20240413822A1
公开(公告)日：2024-12-12
申请号：US18810168
申请日：2024-08-20
Inventor： Ross C. MORGAN , Joe WALKER , Yongjie CHENG , Lingli ZHANG
IPC: H03K17/693 , H03K3/017 , H03K17/687
Abstract: This application relates to methods and apparatus for multichannel drivers for driving transducers in different channels. A multichannel driver has a plurality of output stages configured such that two output nodes can be modulated between selected switching voltages with a controlled duty cycle to generate a differential output signal across a respective transducer, each output stage being operable with different switching voltages in different modes of operation. A first set of two or more of the output stages are arranged to receive a voltage output by a capacitive voltage generator to use as a switching voltage. A controller is configured to control the mode of operation and duty-cycle of each of the output stages based on a respective input signal and also based on operation of the other output stages of the first set.
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公开(公告)号：US20230344331A1
公开(公告)日：2023-10-26
申请号：US17971039
申请日：2022-10-21
Inventor： Lingli ZHANG , Yongjie CHENG , John L. MELANSON
CPC classification number: H02M1/0095 , H02M1/08 , H02M3/07 , H04R3/00
Abstract: A driver apparatus for driving a load with a differential drive signal is described. For a level of input signal within a first range, a first switching driver modulates the voltage at a first output node with a first modulation index by switchably connecting at least one flying capacitor to the first output node, whilst a second switching driver modulates the voltage at a second output node with a second modulation index by controlling switching between DC voltages that are maintained throughout a switching cycle of the driver apparatus. The first and second switching drivers are controlled so, for at least a first part of the first input range, a change in input signal level results in a change of the first controlled modulation index that has a different magnitude to any change in the second controlled modulation index a constant modulation frequency of the differential drive signal is maintained.
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