Cirrus Logic Inc.

Dell Products Inc.

Emmanuel A Marchais

John L Melanson

Eric Lindemann

Carl Lennart Ståhl

Eric Jerome King

Anthony Stephen Doy

Tejasvi Das

Marco A Janko

Jon David Hendrix

Zhong You

Siddharth Maru

Lingli Zhang

Pablo Peso Parada

Chin Huang Yong

Carl L Ståhl

Aleksey Sergeyevich Khenkin

Christian Larsen

Daniel John Allen

John Christopher Tucker

Jason William Lawrence

Dayong Zhou

Matthew Beardsworth

Dana John Taipale

Zhaohui He

Vadim A Konradi

Paul M Astrachan

Dylan Alexander Hester

Hamid Sepehr

Amar Vellanki

Ross Crawford Morgan

Luke Lapointe

Kyehyung Lee

Leyi Yin

Ivan Perry

Drew Kinney

Kathryn Rose Holland

Ziyan Zou

Venugopal Choukinishi

Anil Lal

Kyle Wilkinson

Filippo Rossi

Jason Lee Wardlaw

Gautham Sivasankar

Christophe Jean-Francois Amadi

Robert G Kratsas

James M Nohrden

Jorge L Reynaga

Nicholas Joseph

Bryant Tran

Noel Preecs

Srdjan Marjianovic

The impedance of a connector, such as a flex cable, between a source and load affects the temperature and power consumption within an electronic system, such as a mobile device. According to embodiments described in this disclosure, the impedance of the flex cable may be separately tracked from the impedance of the source, which provides for improved power management within the electronic system. The impedance of the flex cable may be factored into determining a maximum available power to the load. The impedance of the flex cable may also be mapped to a temperature and used to manage power to maintain operation within temperature limits. Additional aspects of power management and impedance tracking for a connector are described herein.

Impedance tracking for connector between source and load

A method may include forming an inductor comprising a plurality of inductor coils comprising a plurality of first inductor coils and a plurality of second inductor coils, each inductor coil comprising a spiraling wire of electrically-conductive material wherein the wire of electrically-conductive material is arranged substantially in a plane, wherein the plurality of first inductor coils and the plurality of second inductor coils are electrically coupled to one another and arranged with respect to one another such that within the plane, electrical current flowing through the inductor flows clockwise in the first inductor coils, within the plane, electrical current flowing through the inductor flows counterclockwise in the second inductor coils, each first inductor coil is adjacent to at least one second inductor coil, and each second inductor coil is adjacent to at least one first inductor coil.

Far field interference cancellation for resistive-inductive-capacitive sensors

A method may include selecting, based on a condition of an electromagnetic load, a selected measurement technique from a plurality of impedance measurement techniques for measuring an impedance of the electromagnetic load and performing the selected measurement technique to generate an estimate of the impedance of the electromagnetic load.

Methods and systems for estimating coil impedance of an electromagnetic transducer

A battery management system, may include an input configured to couple to a power supply, an output configured to couple to a battery, and battery management circuitry coupled between the power supply and the battery and configured to deliver electrical energy to the output at a significantly higher peak-to-average power ratio than receipt of electrical energy to the input.

Pulsed current battery management system

A system for estimating parameters of an electromagnetic load may include an input for receiving an input excitation signal to the electromagnetic load, a broadband content estimator that identifies at least one portion of the input excitation signal having broadband content, and a parameter estimator that uses the at least one portion of the input excitation signal to estimate and output one or more parameters of the electromagnetic load.

Methods and systems for estimating transducer parameters

A method for determining and mitigating over-excursion of an internal mass of an electromechanical transducer may include measuring a sensed signal associated with the electromechanical transducer in response to a driving signal driven to the electromechanical transducer, determining a non-linearity value based on the sensed signal, mapping the non-linearity value to a probability of over-excursion of the internal mass, and applying a gain to a signal path configured to generate the driving signal based on the probability.

Detection and prevention of non-linear excursion in a haptic actuator

A two-cell battery management system may include a switching network comprising a plurality of switches configured to electrically couple two battery cells to one another and a first load configured to receive electrical energy from the two battery cells and control circuitry configured to dynamically control the switching network among a plurality of switching configurations comprising a first switching configuration in which the first load is in parallel with both of the two battery cells, a second switching configuration in which the first load is in parallel with a first battery cell of the two battery cells and is electrically isolated from a second battery cell of the two battery cells, and a third switching configuration in which the first load is in parallel with the second battery cell and is electrically isolated from the first battery cell.

Configurable network for enabling efficient charging and loading of two battery cells

A resonant frequency tracker for driving an electromagnetic load with a driving signal may include a signal generator configured to generate a waveform signal at a driving frequency for driving an electromagnetic load and control circuitry. The control circuitry may be configured to, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receive a current signal representative of a current associated with the electromagnetic load and a second signal representative of a second quantity associated with the electromagnetic load, the second quantity comprising one of a voltage associated with the electromagnetic load or a back electromotive force of the electromagnetic load. The control circuitry may be further configured to calculate a phase difference between the current signal and the second signal, determine a frequency error of the waveform signal based on the phase difference, and control the driving frequency based on the frequency error.

Resonant tracking of an electromagnetic load

A power delivery system may include an inductive power converter comprising a shared connection to a shared voltage from a battery, multiple inductive phases, each of the multiple inductive phases configured to generate a respective voltage from the shared voltage, multiple regulated voltage connections, and one or more switches configured and arranged to selectively assign at least one of the multiple inductive phases to a regulated voltage connection selected from the multiple regulated voltage connections.

Multi-output multi-phase boost converter with dynamically assignable phases

A system may include an electromagnetic actuator, a first coil configured to drive mechanical displacement of the electromagnetic actuator, a second coil configured to drive mechanical displacement of the electromagnetic actuator, and an inductance sensing subsystem having an inductance sensing path coupled to the first coil and the second coil. The inductance sensing subsystem may be configured to select one of the first coil and the second coil for driving mechanical displacement of the electromagnetic actuator, select the other of the first coil and the second coil as a sensing coil for sensing displacement of the electromagnetic actuator, determine a displacement of the electromagnetic actuator based on a measurement of estimated inductance of the sensing coil, and when switching selection of the sensing coil from the first coil to the second coil determine the displacement of the first coil based on a measured inductance of the first coil at approximately the time of switching selection, estimate state variables of the inductance sensing path to be used with the second coil based on the displacement, and apply the state variables to the inductance sensing path after switching selection of the sensing coil from the first coil to the second coil.

Minimizing transient artifact of position estimate in inductively-sensed electromagnetic actuator system with shared inductive sensor

A method for estimating actuator parameters for an actuator, in-situ and in real-time, may include driving the actuator with a test signal imperceptible to a user of a device comprising the actuator during real-time operation of the device, measuring a voltage and a current associated with the actuator and caused by the test signal, determining one or more parameters of the actuator based on the voltage and the current, determining an actuator type of the actuator based on the one or more parameters, and controlling a playback signal to the actuator based on the actuator type.

Methods and systems for in-system estimation of actuator parameters

A method may include receiving, by a transducer driving system, a first signal for driving an amplifier that drives an electromagnetic load and receiving, by the transducer driving system, a second signal driven by the amplifier in order to control a feedback loop of the transducer driving system. The method may also include detecting unexpected spectral content in the second signal, declaring an indicator event based on the detected unexpected spectral content, determining whether the indicator event occurs in an undesired pattern, and in response to the indicator event occurring in the undesired pattern, modifying a behavior of the transducer driving system.

Methods and systems for detecting and managing unexpected spectral content in an amplifier system

Driver circuitry for driving an electromechanical load with a drive output signal, the driver circuitry comprising: a first control loop operable to control the drive output signal based on a drive input signal; and a second control loop operable to control the drive output signal based on a current flowing through and/or a voltage induced across the electromechanical load, wherein the second control loop is configured to have a lower latency than the first control loop, and to control the drive output signal to compensate for an impedance of the electromechanical load.

Driver circuitry

In accordance with embodiments of the present disclosure, a method of driving a playback waveform to an electromagnetic actuator by a transducer driving system may include operating the transducer driving system in a first mode wherein the electromagnetic actuator is driven with the playback waveform in a closed loop to form a closed-loop voltage drive system that includes a negative impedance, operating the transducer driving system in a second mode wherein the electromechanical actuator is driven with the playback waveform in an open loop, and operating a mode switch for transitioning the transducer driving system to operate between the first mode and the second mode.

Methods and systems for managing mixed mode electromechanical actuator drive

A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load and, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may also include implementing an adaptive filter to identify parameters of the mechanical impedance of the electromagnetic load, wherein an input of a coefficient control for adapting coefficients of the adaptive filter is a first signal derived from the back electromotive force signal and a target of the coefficient control for adapting coefficients of the adaptive filter is a second signal derived from the current signal.

Identifying mechanical impedance of an electromagnetic load using least-mean-squares filter

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Dripping Springs, TX, United States of America

Emmanuel A Marchais