Nxp Usa, Inc.

Zhendong Fei

Xiang Gao

Dechang Wang

Chongli Wu

Wanfu Ye

A wireless power receiver has over-voltage protection (OVP) circuitry that performs different techniques for different over-voltage conditions. The OVP circuitry includes controllable resistive clamp circuitry (a resistor in series with a resistor control switch) and controllable capacitive clamp circuitry (a capacitor in series with a capacitor control switch). Based on an output-based feedback signal and a reference signal, comparison circuitry generates comparison signals, based on which a controller selectively enables (i) the resistive clamp circuitry intermittently for a relatively low over-voltage condition and continuously for a higher over-voltage condition and (ii) the capacitive clamp circuit to detune the receiver, both in order to decrease the rectified output voltage.

Overvoltage protection circuit for wireless power receiver

A system and method for demodulating a wireless power signal onto which binary data has been modulated involves processing the wireless power signal with analog circuitry to produce a modified power signal in accordance with the type of demodulation used, periodically capturing digital samples of the modified power signal to produce a series of digital samples, applying, with an MCU, at least two digital filtering algorithms to the digital samples to determine transitions associated with the modulation, and recovering, with the MCU, the binary data as a function of the determined transitions. The demodulator is applicable to bidirectional power transfer capable devices and includes algorithms that can be applied similarly to both ASK and FSK demodulations with little or no modification.

Bidirectional communication demodulation for wireless charging system

A power receiver for a wireless power transmission system that includes a power transmitter has input circuitry that converts power received from the power transmitter into an input signal. A regulator regulates the input signal to generate a regulated output signal based on a current reference signal and a voltage reference signal, and a load receives the regulated output signal. The regulator controls at least one of the current reference signal and the voltage reference signal to control power loss within the regulator. In one embodiment, the regulator globally controls the voltage of the rectified input signal and locally controls the current reference signal to limit power loss in the regulator as well as meet system load requirements.

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Shanghai, China

Zhendong Fei