CIRCUIT AND ARCHITECTURE FOR A DEMODULATOR FOR A WIRELESS POWER TRANSFER SYSTEM AND METHOD THEREFOR
First Claim
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 being excited into oscillation by excitation signal, the tank circuit receiving a signal from the secondary side wireless power receiver;
a delay circuit generating a fixed delay clock signal from the excitation signal;
a sample and hold circuit sampling a tank circuit voltage 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.
1 Assignment
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Accused Products
Abstract
A primary side wireless power transmitter inductively couplable to a secondary side wireless power receiver for receiving communications from the secondary side wireless power receiver through the inductive coupling having a primary side tank circuit receiving a signal from the secondary side wireless power receiver. A phase delay or time delay circuit generates a fixed delay clock signal from a signal utilized to excite the primary side tank circuit. 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
20 Claims
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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:
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a primary side tank circuit being excited into oscillation by excitation signal, the tank circuit receiving a signal from the secondary side wireless power receiver; a delay circuit generating a fixed delay clock signal from the excitation signal; a sample and hold circuit sampling a tank circuit voltage 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 comprising:
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exciting a tank circuit into oscillation utilizing at excitation signal; receiving a signal stream from the wireless power receiver in a primary side tank circuit; generating a fixed delayed clock signal from the excitation signal; sampling the tank circuit voltage utilizing the fixed delayed clock and holding the sampled value; generating a threshold voltage signal from the signal stream signal; and extracting data from the signal stream utilizing the threshold voltage signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A wireless power transfer system comprising:
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a transmitter for transmitting electrical energy through a first inductive coil electromagnetically coupled to a second inductive coil and a receiver; a circuit in the receiver coupling a resistor or capacitor across the second inductive coil to generate data or command signals in the first inductive coil; a sample and hold circuit sampling a value of signal in the first inductive coil and holding the value, the sample being taken at a fixed delay from the excitation signal for the first coil; and a comparator coupled to an output of the sample and hold circuit for extracting data or commands from a signal stream. - View Dependent Claims (18, 19, 20)
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Specification