Circuit and architecture for a demodulator for a wireless power transfer system and method therefor

摘要

A primary side wireless power transmitter inductively couplable to a secondary side wireless power receiver for supplying power to the wireless power receiver for receiving communications from the secondary side wireless power receiver through the inductive coupling comprises a primary side tank circuit receiving a signal on from the secondary side wireless power receiver. A phase delay or time delay circuit generates a fixed delay clock signal. A sample and hold circuit samples a tank circuit voltage utilizing the fixed phase or time delayed clock signal. A comparator is coupled to an output of the sample and hold circuit for extracting data or commands from the signal stream. A method of operating a primary side wireless transmitter inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver to power a load coupled to the receiver is also disclosed.

主权项

1. In a primary side wireless power transmitter for being inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver to power a load coupled to the wireless power receiver, a primary side control for receiving communications from the secondary side wireless power receiver through the inductive coupling, comprising:
a primary side tank circuit receiving a signal stream on from the secondary side wireless power receiver; a delay circuit generating a fixed phase delay clock signal from a tank circuit signal; a sample and hold circuit sampling the tank circuit signal utilizing the fixed delayed clock signal; and a comparator coupled to an output of the sample and hold circuit for extracting data or commands from the signal stream.