CIRCUIT AND ARCHITECTURE FOR A DEMODULATOR FOR A WIRELESS POWER TRANSFER SYSTEM AND METHOD THEREFOR
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Abstract
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.
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Citations
24 Claims
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1. (canceled)
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24. A wireless power transfer system comprising:
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a transmitter for transmitting electrical energy through a first inductive coil of a tank circuit, which is electromagnetically coupled to a second inductive coil in a receiver; the transmitted electrical energy powering or charging device coupled to the receiver; a circuit in the receiver generating a signal stream which can be recognized the second inductive coil to generate data or command signals in the first conductive coil; a sample and hold circuit sampling a value of signal in the first conductive coil and holding the value, the sample being taken at a fixed delay from the signal in the first inductive coil; and a comparator coupled to an output of the sample and hold circuit for extracting data or commands from the signal stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 22, 23)
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Specification