Apple Inc.

Intersil Americas Inc.

Micrel, Incorporated

Fairchild Semiconductor Corporation

Other

Sony Corporation

Raytheon Company

Sony Electronics Inc

Chrontel Inc.

Techwell, Inc.

David W Ritter

Steven G Herbst

Todd K Moyer

Robert David Zucker

Warren Craddock

David B Kosecoff

Steven Charles Michalske

David Samuel Kumka

Jeffrey M Alves

Tavys Q Ashcroft

Madhusudanan Keezhveedi Sampath

Itaru Hiromi

Aditya Rao

Ariadne Smith

Jeffrey J Terlizzi

Zaki Moussaoui

Christopher S Graham

Stephen Christopher Terry

Shimon Elkayam

Chad A Bossetti

Carl Warren Craddock

Philip Golden

Nileshbhai J Shah

Ignatius S Bezzam

Mitchell Feldman

Mark J Fimoff

Zhen Zhang

Dennis M Mutzabaugh

Zhang Jia

Ara Bicakci

Khanh Lam

Greg Tomezak

Christopher S Erickson

Philip V Golden

Bruce L Hennig

Curtis Robinson

Andrew Cowell

Amy M Winkler

Pradeep Bhardwaj

Ralf J Muenster

Gerard E Taylor

Kathryn M Tucker

Kevin Brehmer

A wireless charging mat and method of operating the same. The wireless charging mat includes a detection system configured to determine a location and an orientation of an electronic device on the wireless charging mat. The location and orientation are determined based on detected locations of one or more structural features of the electronic device. The wireless charging mat is operated according to the detected location and orientation.

Detection of object location and orientation on a wireless charge mat

A wireless charging system including a transmitter and a receiver. The transmitter is formed of a coil of wire that includes a first loop portion, a second loop portion, and a crossing portion. The crossing portion electrically couples the first loop portion and the second loop portion such that when current is generated in the coil, electrical current flows through the first loop portion in a different rotational direction than in the second loop portion. The receiver is formed of a ferromagnetic core and multiple (e.g., three) coils disposed about the ferromagnetic core. Each coil may be disposed about a different axis of the core such that current may be induced in at least one of the coils by a magnetic field in any direction.

Wireless charging station

An electronic device may be provided with a color sensing ambient light sensor. The color sensing ambient light sensor may measure the color of ambient light. Control circuitry in the electronic device may use information from the color sensing ambient light sensor in adjusting a display in the electronic device or taking other action. The color sensing ambient light sensor may have light detectors with different spectral responses. A test system may be used to calibrate the color sensing light sensor. The test system may have a tunable light source with light-emitting diodes that are turned on in sequence while gathering measured responses from the detectors. Numerical optimization techniques may be used to produce final versions of the spectral responses for the light detectors from the measured responses and corresponding calibration data that is stored in the electronic device.

Methods for color sensing ambient light sensor calibration

A wireless charging table comprising a table top having an upper surface upon which one or more electronic devices can be placed, a wireless charging transmitter positioned under the upper surface of the table top, the wireless charging transmitter comprising a plurality of transmitter coils that define a charging region at the upper surface of the table top, and a power distribution system operatively coupled to the wireless charging transmitter, the power distribution system configured to receive power from an alternating current (AC) power source and distribute power to the wireless charging transmitter. The plurality of transmitter coils include at least a first transmitter coil comprising: a first loop portion; a second loop portion; and a crossing portion comprising overlapping conductive paths that electrically couple the first loop portion.

Wireless charging retail systems

Methods and apparatuses for improved efficiency of power transfer across an inductive charging interface by adaptively changing the impedance of the receive coil in response to changes in load conditions during inductive power transfer are disclosed.

Impedance matching for inductive power transfer systems

A system and method for identifying a position of a moving object, regardless of static objects present in the optical field of an active infrared (IR) proximity detector, is provided. Moreover, a modulated light emitting diode (LED) signal is captured and processed through I/Q demodulation. Specifically, the reflections received at an IR sensor are demodulated to generate in-phase (I) and quadrature phase (Q) signals and the derivative of I/Q signals is obtained to isolate motion. For example, an I/Q domain differentiator or a high pass filter is employed to calculate the derivative, which actively remove the effects of all forms of static interference. Further, the phase of the derivative I/Q signals is determined and is utilized to reconstruct the distance at which the motion occurred.

Distance sensing by IQ domain differentiation of time of flight (TOF) measurements

A receiver device in a coupled coil system for wireless energy transfer includes a receiver coil and a load device operatively connected to the receiver coil and configured to receive a signal from the receiver coil. As one example, the load device is a rechargeable battery. An adjusting filter is included in the receiver device and is operatively connected between the receiver coil and the load device. The adjusting filter can be used to transform the effective resistance or impedance of the load as presented to the transformer during energy transfer so that the effective resistant or impedance of the load is maintained at a substantially constant level, and the signal received by the load device is maintained at a substantially constant level.

Adjusting filter in a coupled coil system

In an inductive energy transfer system, the phase of a signal that is applied to a transmitter coil to transfer energy is adjusted while energy is transferred from the transmitter device to a receiver device. The phase of the signal can be adjusted by changing a state of a DC-to-AC converter from a converting state to a non-converting state. The DC-to-AC converter outputs a signal that is applied to the transmitter coil when the DC-to-AC converter is in a converting state. A signal is not applied to the transmitter coil when the DC-to-AC converter is in a non-converting state.

Reducing power dissipation in inductive energy transfer systems

Wireless power transfer systems having improved power transfer efficiency are disclosed. A wireless power receiver may include an automatic impedance regulator that adjusts the effective input impedance of the receiver depending upon the power requirements of the receiver. For example, in certain embodiments, the impedance regulator is a boost converter. The boost converter may exploit the leakage inductance of the receive coil to boost the voltage output from the terminals of the receive coil. The effective input impedance may be substantially matched to the output impedance of the transmitter.

Automatic boost control for resonant coupled coils

Described herein are optical proximity detectors, methods for use therewith, and systems including an optical proximity detector. Such optical proximity detectors include an analog front-end and a digital back-end. In certain embodiments, the digital back-end includes a dynamic gain and phase offset corrector, a cross-talk corrector, a phase and magnitude calculator, and a static phase offset corrector. The dynamic gain and phase offset corrector corrects for dynamic variations in gain and phase offset of the analog front-end due to changes in temperature and/or operating voltage levels. The crosstalk corrector corrects for electrical and/or optical crosstalk associated with the analog front-end. The phase and magnitude calculator calculates phase and magnitude values in dependence on the corrected versions of digital in-phase and quadrature-phase signals received from the analog front-end. The static phase offset corrector corrects for a static phase offset of the optical proximity detector.

Optical proximity detectors

Provided herein are methods and systems that provide automatic compensation for frequency attenuation of a video signal transmitted over a cable. In accordance with an embodiment, a system includes an equalizer and a compensation controller. The equalizer receives a video signal that was transmitted over a cable, provides compensation for frequency attenuation that occurred during the transmission over the cable, and outputs a compensated video signal. The compensation controller automatically adjusts the compensation provided by the equalizer based on comparisons of one or more portions of the compensated video signal to one or more reference voltage levels. One or more values indicative of one or more levels of compensation provided by the equalizer are stored in memory and/or registers for each time, of a plurality of times. A monitor monitors for changes in the cable and/or the video signal transmitted over the cable based on the stored values. Additionally, the monitor can selectively trigger an alert based on changes in the one or more stored values.

Cable equalization and monitoring for degradation and potential tampering

Systems and methods for controlling transmission of signals are described. A camera-side modem is configured to receive two signals from a video camera and to extract a received passband signal from a transmission line. A detector in the camera-side modem generates an alarm signal when disruption or loss of the received passband signal is identified. An enable signal is used to control transmission of at least one of the baseband video signal and the passband video signal. The passband signal may be identified by an estimate of mean square error in a quadrature amplitude demodulator, a measurement of reliability provided by a constellation detector, a measurement of reliability based on a sequence of frame synchronizations and/or an estimate of mean square error in an equalizer. The detector may monitor a gain factor in an automatic gain control module of the camera-side modern and/or a magnitude of the received passband signal.

Systems and methods for detecting tampering with video transmission systems

Growing community of inventors

San Jose, CA, United States of America

David W Ritter