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公开(公告)号：US11638094B2
公开(公告)日：2023-04-25
申请号：US17057516
申请日：2019-05-29
Inventor： Pablo Peso Parada , Rahim Saeidi , John L. Melanson
IPC: H04R3/02 , H04M1/20 , G10K11/178
Abstract: A howling detector is described that is configured to receive an input signal and to determine measure of the linearity of a logarithmic representation of the energy of the input signal. In some examples, this triggers gain adjustment (e.g. of a noise control unit) and, in some further examples, the amount of the gain adjustment may be based on an estimation of the maximum stable gain of a noise control unit.
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公开(公告)号：US11631390B2
公开(公告)日：2023-04-18
申请号：US16236861
申请日：2018-12-31
Inventor： Dayong Zhou , John L. Melanson
IPC: G10K11/178 , H04M1/60 , H04M1/03
Abstract: The overall performance of an ANC system may be improved by configuring the ANC system to perform adaption in the frequency domain. The ANC systems may be configured to update an algorithm of an adaptive filter based, at least in part, on the first input signal, the second input signal, and a feedback signal that is based on an output of the adaptive filter. Updating may include changing parameters of the algorithm based on a SDR based, at least in part, on the first input signal. Updating may also include normalizing a step size and processing at least full band information for the input signal in a frequency domain to generate coefficient values for the algorithm. Updating may also include applying a frequency domain magnitude constraint on adaptive filter coefficients.
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公开(公告)号：US11616434B2
公开(公告)日：2023-03-28
申请号：US17892575
申请日：2022-08-22
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：US11594958B2
公开(公告)日：2023-02-28
申请号：US17538169
申请日：2021-11-30
Inventor： Eric J. King , Axel Thomsen , Anthony S. Doy , Thomas H. Hoff , John L. Melanson
Abstract: Driver circuitry for driving a load based on an input signal, comprising: at least one variable boost stage comprising: first and second input nodes configured to receive a first voltage and a second voltage respectively; first and second flying capacitor nodes for connection to a flying capacitor therebetween; a network of switching paths for selectively connecting the first and second input nodes with the first and second flying capacitor nodes; an output stage for selectively connecting a driver output node to each of the first and second flying capacitor nodes; and a controller operable in a first boost mode to: control the output stage to selectively connect the driver output node to the first flying capacitor node; control the network of switching paths to switch connection of the second flying capacitor node between the first and second input nodes at a controlled duty cycle; and in a first charge top-up cycle, control the network of switching paths to connect the first input node to the first flying capacitor node during a phase of the controlled duty cycle in which the first input node is connected to the second flying capacitor node; wherein the frequency of the controlled duty cycle is greater than the frequency of the charge top-up cycle.
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公开(公告)号：US11476759B2
公开(公告)日：2022-10-18
申请号：US16709036
申请日：2019-12-10
Inventor： Jason W. Lawrence , John L. Melanson , Eric J. King
Abstract: A system may include a power converter comprising at least one stage having a dual anti-wound inductor constructed such that its windings generate opposing magnetic fields in its magnetic core and a current control subsystem for controlling an electrical current through the dual anti-wound inductor. The current control subsystem may be 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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Patent Agency Ranking
公开(公告)号：US20220329216A1
公开(公告)日：2022-10-13
申请号：US17521268
申请日：2021-11-08
Inventor： Leyi Yin , John L. Melanson , Eric Lindemann , Amar Vellanki , Jianhao Chen , Venugopal Choukinishi , Wai-Shun Shum , Xiaofan Fei
Abstract: A multi-path audio amplification system that provides an output drive signal to electromechanical output transducers provides improved undistorted headroom, reduced path switching noise, and/or improved frequency response performance. Multiple signal amplification paths receive an audio input signal and have corresponding multiple output stages that have differing output impedances. A mode selector selects an active one of the multiple signal amplification paths is selected to supply the output drive signal. Outputs of the multiple output stages are coupled to the electromechanical transducer to provide the output drive signal and at least one of the multiple signal amplification paths includes an equalization filter for filtering the audio input signal to compensate for phase or gain differences referenced from the input to the outputs of the multiple output stages due to interaction between the differing output impedances and an impedance of the electromechanical transducer.
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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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公开(公告)号：US11469661B2
公开(公告)日：2022-10-11
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：US11385666B1
公开(公告)日：2022-07-12
申请号：US17339274
申请日：2021-06-04
Inventor： Hamed Sadati , John A. Breslin , Sushanth Hegde , John L. Melanson
IPC: G05F1/56
Abstract: Circuitry comprising: a capacitor; first circuitry; and second circuitry, wherein the circuitry is operable to couple the capacitor to the first circuitry when the first circuitry is active, and to couple the capacitor to the second circuitry when the first circuitry is inactive or is not actively using the capacitor.
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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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