Apple Inc.

Jose V Santos Martinez

Yongxuan Hu

Moshe H Malkin

Nileshbhai J Shah

Arash Mehrabi

Michael F Jean

Atul A Salvekar

Brian D Mariner

Benjamin M Oztalay

Bo Zhou

Andrew H Jones

A wireless power transmitter can include a wireless power transmitter coil adapted to magnetically couple the wireless power transmitter to a wireless power receiver, a resonant capacitor coupled to the wireless power transmitter coil to form a resonant circuit, and an inverter having an input that receives a DC voltage and an AC output coupled to the resonant circuit. The inverter can further include a plurality of switching devices coupled between the input and AC output of the inverter, a controller configured to generate pulse width modulated (PWM) drive signals for the plurality of switching devices, wherein the PWM drive signals are tri-state PWM signals having three output levels, and zero crossing detection circuitry that receives the PWM drive signals for corresponding switching devices and signals corresponding to voltages across the corresponding switching devices and generates gate drive signals for the corresponding switching devices.

Pulse width modulated inverter control with multi-state signaling

A data processing system can include a first IC including one or more A/D converters that receive analog inputs from one or more sensors and generate corresponding digital data, a second IC including one or more processing elements that operate on the digital data, and communication circuitry, coupled between the one or more A/D converters and processing elements, that includes a packetizer on the first IC that receives samples and sample data from the one or more A/D converters and assembles each sample and corresponding sample data into a packet, a primary physical interface on the first IC that communicates the packet to a secondary physical interface on the second IC, and a de-packetizer that on the second IC that receives the packet, de-packetizes it, and delivers the sample and sample data to the one or more processing elements.

Data transfer between analog and digital integrated circuits

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

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San Jose, CA, United States of America

Jose V Santos Martinez