Apple Inc.

Atul A Salvekar

Moshe H Malkin

Jeffrey Douglas Louis

Arunim Kumar

Rex Pius Huang

Michael F Jean

Arash Mehrabi

Mikhal S De Jesus

Jose V Santos Martinez

Michael Scott Eckert

Brian D Mariner

Benjamin M Oztalay

Andrew H Jones

Bo Zhou

A wireless power receiving device has a receive coil that receives wireless power signals from a wireless power transmitting device and has a rectifier that produces direct-current power from the received wireless power signals. The receive coil of the wireless power receiving device is coupled to wireless transceiver circuitry. Similarly the transmit coil of the wireless power transmitting device is coupled to wireless transceiver circuitry. The wireless transceiver circuitry in the wireless power receiving device or transmitting may be configured to generate and/or modulate one or more data carrier waves using any desired modulation scheme. The one or more modulated data carrier waves are transmitted between the transmit coil and the receive coil of the corresponding wireless power transmitting and receiving devices. The one or more data carrier waves may have a frequency that is different than the power transmission frequency.

Wireless power system with in-band communication

An inductive power transmitter and an inductive power receiver include communication circuitry to communicate using modulation of the power transfer field. The inductive power transmitter or the inductive power receiver includes monitoring circuitry to determine a communication fault condition. If a communication fault condition is determined, a converter of the inductive power transmitter or inductive power receiver can adjust a control parameter.

Wireless power transfer

A wireless power transmitting device transmits wireless power signals to a wireless power receiving device using a wireless power transmitting coil. The wireless power receiving device may transmit data packets to the wireless power transmitting device. The wireless power transmitting device may include a data receiver that is coupled to the wireless power transmitting coil and that receives the transmitted data packets. The data receiver may be configured to demodulate the received data packets. The data packets may include at least preamble bits, start bits, and data bits encoded as biphase half-bit signals in accordance with a predefined wireless power transfer protocol. During demodulation, the receiver may perform preamble detection, start bit detection, and data bit detection by comparing the input signals to corresponding reference patterns using a maximum likelihood sequence detection scheme. Phase recovery may be employed throughout to help provide immunity to phase change.

Methods and apparatus for performing demodulation using maximum likelihood sequence matching in a wireless charging device

Growing community of inventors

Oakland, CA, United States of America

Atul A Salvekar