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公开(公告)号：US12257601B2
公开(公告)日：2025-03-25
申请号：US18615241
申请日：2024-03-25
Inventor： Axel Thomsen , Eric J. King , Anthony S. Doy , Thomas H Hoff , John L. Melanson
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A driver circuit has first and second switching drivers for driving the transducer in a bridge-tied-load configuration, each of the switching drivers having a respective output stage for controllably switching the respective driver output node between high and low switching voltages with a controlled duty cycle. Each of switching drivers is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes. A controller controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles; and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit.
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52.发明申请公开(公告)号：US20250038642A1
公开(公告)日：2025-01-30
申请号：US18358263
申请日：2023-07-25
Inventor： John L. Melanson , Eric J. King
Abstract: A cascaded switched power converter provides a wide voltage conversion ratio and improved efficiency ins systems such as power supplies and amplifiers. A switched-capacitor charge pump circuit is operated by one or more first clock signals and is coupled in cascade with an inductor-based power supply circuit according to one or more second clock signals. A control circuit that generates clock signals so that the one or more second clock signals have a phase offset with respect to the one or more first clock signals that is set to adjust a conversion ratio of the cascaded combination of the switched-capacitor charge pump circuit and the inductor-based power supply circuit. The inductor of the inductor-based power supply circuit may be an inductive load, such as a speaker, and the phase offset may be modulated according to an audio signal to provide audio amplification.
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公开(公告)号：US12184110B2
公开(公告)日：2024-12-31
申请号：US18503830
申请日：2023-11-07
Inventor： Ivan Perry , Hasnain Akram , Eric J. King
IPC: H02J7/00
Abstract: A power management system for use in a device comprising a battery and one or more components configured to draw electrical energy from the battery may include a first power converter configured to electrically couple between charging circuitry configured to provide electrical energy for charging the battery and the one or more downstream components and a bidirectional power converter configured to electrically couple between the charging circuitry and the battery, wherein the bidirectional power converter is configured to transfer charge from the battery or transfer charge from the battery based on a power requirement of the one or more components and a power available from the first power converter.
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公开(公告)号：US12119834B2
公开(公告)日：2024-10-15
申请号：US17898635
申请日：2022-08-30
Inventor： John L. Melanson , Eric J. King , Thomas H. Hoff , Lingli Zhang
CPC classification number: H03M1/0626 , H03M1/0612 , H03M1/822
Abstract: Pulse width modulation (PWM) driver circuitry comprising: a loop filter configured to receive an analog input signal and to output a digital loop filter output signal based on the analog input signal and an analog feedback signal; and a PWM modulator configured to receive a digital signal based on the digital loop filter output signal and to output a PWM signal, wherein the PWM driver circuitry further comprises a feedback path coupled to an output of the PWM driver circuitry for the analog feedback signal.
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公开(公告)号：US11980913B2
公开(公告)日：2024-05-14
申请号：US18323779
申请日：2023-05-25
Inventor： Axel Thomsen , Eric J. King , Anthony S. Doy , Thomas H. Hoff , John L. Melanson
CPC classification number: B06B1/0223 , B06B1/0215 , B06B1/0688 , G06F3/016 , H10N30/802
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A driver circuit has first and second switching drivers for driving the transducer in a bridge-tied-load configuration, each of the switching drivers having a respective output stage for controllably switching the respective driver output node between high and low switching voltages with a controlled duty cycle. Each of switching drivers is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes. A controller controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles; and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit.
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Patent Agency Ranking
公开(公告)号：US11791816B2
公开(公告)日：2023-10-17
申请号：US17590943
申请日：2022-02-02
Inventor： Axel Thomsen , Eric J. King , Anthony S. Doy , Thomas H. Hoff , John L. Melanson
IPC: H03K17/687 , H02N2/00 , H02M3/158
CPC classification number: H03K17/6871 , H02M3/158 , H02N2/0075
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.
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公开(公告)号：US11777516B2
公开(公告)日：2023-10-03
申请号：US17667953
申请日：2022-02-09
Inventor： John L. Melanson , Axel Thomsen , Mucahit Kozak , Paul Wilson , Eric J. King
IPC: H03M3/00
Abstract: A signal processing system may include a sensor readout channel configured to convert an electronic signal into a digital quantity. The sensor readout channel may include a first-order sigma-delta modulator having a modulator input and a modulator output, first outside chopping switches located at the modulator input, second outside chopping switches located at the modulator output, an auxiliary path having an analog-to-digital converter (ADC) having an auxiliary path input and an auxiliary path output, the auxiliary path input configured to receive as its input signal a signal output by a memory element of the first-order sigma-delta modulator, and a signal combiner configured to combine a modulator output signal generated by the first-order sigma-delta modulator with an auxiliary path output signal generated by the auxiliary path to generate a combined output signal.
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公开(公告)号：US11777495B2
公开(公告)日：2023-10-03
申请号：US17740468
申请日：2022-05-10
Inventor： John L. Melanson , Eric J. King , Thomas H. Hoff , Axel Thomsen
IPC: H03K17/687 , H02N2/00 , H02M3/158
CPC classification number: H03K17/6871 , H02M3/158 , H02N2/0075
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers where the switching driver has an output bridge stage for switching an output node between switching voltages and a modulator for controlling the duty cycle of the output bridge stage based on an input signal. The switching driver also includes a voltage controller for providing the switching voltages which is operable to provide different switching voltages in different driver modes. A controller is provided to control the driver mode of operation and the duty cycle of the switching driver based on the input signal, and the controller is configured to transition from a present driver mode to a new driver mode by controlling the voltage controller to provide the switching voltages for the new mode and controlling the modulator to vary the duty cycle of the output bridge stage. The change in duty cycle is controlled such that there is no substantial discontinuity in switching ripple due to the mode transition.
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公开(公告)号：US11695337B2
公开(公告)日：2023-07-04
申请号：US17525463
申请日：2021-11-12
Inventor： Jason W. Lawrence , John L. Melanson , Eric J. King
IPC: H02M3/155
CPC classification number: H02M3/155
Abstract: A system may include a power converter comprising at least one stage having a dual anti-wound inductor having a first winding and a second winding constructed such that its windings generate opposing magnetic fields in its magnetic core and constructed such that a coupling coefficient between the first winding and the second winding is less than approximately 0.95 and a current control subsystem for controlling an electrical current through the dual anti-wound inductor, the current control subsystem configured to minimize a magnitude of a magnetizing electrical current of the dual anti-wound inductor to prevent core saturation of the dual anti-wound inductor and regulate an amount of output electrical current delivered by the power converter to the load in accordance with a reference input signal.
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公开(公告)号：US11684950B2
公开(公告)日：2023-06-27
申请号：US17314890
申请日：2021-05-07
Inventor： Axel Thomsen , Eric J. King , Anthony S. Doy , Thomas H. Hoff , John L. Melanson
CPC classification number: B06B1/0223 , B06B1/0215 , B06B1/0688 , G06F3/016 , H10N30/802
Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A driver circuit has first and second switching drivers for driving the transducer in a bridge-tied-load configuration, each of the switching drivers having a respective output stage for controllably switching the respective driver output node between high and low switching voltages with a controlled duty cycle. Each of switching drivers is operable in a plurality of different driver modes, wherein the switching voltages are different in said different driver modes. A controller controls the driver mode of operation and the duty cycle of the switching drivers based on the input signal. The controller is configured to control the duty cycles of the first and second switching drivers within defined minimum and maximum limits of duty cycles; and to transition between driver modes of operation when the duty cycle of one of the switching drivers reaches a duty cycle limit.
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