Resonant power transfer systems having efficiency optimization based on receiver impedance
First Claim
1. A wireless power transfer system comprising:
- a transmitter driven by a power source and a transmit controller, wherein the transmitter is configured to control delivery of wireless power; and
a receiver inductively coupled to the transmitter, the receiver configured to receive the wireless power from the transmitter and deliver the received wireless power to a load via a converter circuit, the receiver including receiver electronics configured to;
vary an ideal source voltage of the receiver at an input of the converter circuit;
monitor changes in an ideal source current at the input of the converter circuit while varying the ideal source voltage;
calculate a Thevenin equivalent impedance of the wireless power transfer system based on the monitored changes in the ideal source current at the input of the converter circuit;
calculate a Thevenin equivalent source voltage of the wireless power transfer system based on the Thevenin equivalent impedance; and
control the converter circuit, based on the calculated Thevenin equivalent impedance and the calculated Thevenin equivalent source voltage, to control the ideal source voltage to vary an amount of the wireless power transferred from the transmitter to the receiver.
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Accused Products
Abstract
The present disclosure provides systems and methods for controlling wireless power transfer systems. A wireless power transfer system includes a transmitter driven by a power source and a transmit controller, wherein the transmitter is configured to control delivery of wireless power, and a receiver inductively coupled to the transmitter, the receiver configured to receive the wireless power from the transmitter and deliver the received wireless power to a load. The receiver includes receiver electronics configured to determine a Thevenin equivalent impedance of the wireless power transfer system, determine a Thevenin equivalent source voltage of the wireless power transfer system, and control, based on the determined Thevenin equivalent impedance and the determined Thevenin equivalent source voltage, an ideal source voltage of the receiver to vary the amount of the wireless power transferred from the transmitter to the receiver.
294 Citations
18 Claims
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1. A wireless power transfer system comprising:
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a transmitter driven by a power source and a transmit controller, wherein the transmitter is configured to control delivery of wireless power; and a receiver inductively coupled to the transmitter, the receiver configured to receive the wireless power from the transmitter and deliver the received wireless power to a load via a converter circuit, the receiver including receiver electronics configured to; vary an ideal source voltage of the receiver at an input of the converter circuit; monitor changes in an ideal source current at the input of the converter circuit while varying the ideal source voltage; calculate a Thevenin equivalent impedance of the wireless power transfer system based on the monitored changes in the ideal source current at the input of the converter circuit; calculate a Thevenin equivalent source voltage of the wireless power transfer system based on the Thevenin equivalent impedance; and control the converter circuit, based on the calculated Thevenin equivalent impedance and the calculated Thevenin equivalent source voltage, to control the ideal source voltage to vary an amount of the wireless power transferred from the transmitter to the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver for use in a wireless power transfer system, the receiver configured to receive wireless power from a transmitter driven by a power source and a transmit controller, and configured to deliver the received wireless power to a load via a converter circuit, the receiver comprising:
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a receiving coil; and receiver electronics coupled to the receiving coil, the receiver electronics configured to; vary an ideal source voltage of the receiver at an input of the converter circuit; monitor changes in an ideal source current at the input of the converter circuit while varying the ideal source voltage; calculate a Thevenin equivalent impedance of the wireless power transfer system based on the monitored changes in the ideal source current at the input of the converter circuit; calculate a Thevenin equivalent source voltage of the wireless power transfer system based on the Thevenin equivalent impedance; and control the converter circuit, based on the calculated Thevenin equivalent impedance and the calculated Thevenin equivalent source voltage, to control the ideal source voltage to vary an amount of the wireless power transferred from the transmitter to the receiver. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for controlling a wireless power transfer system, the wireless power transfer system including a receiver inductively coupled to a transmitter, the receiver configured to receive wireless power from the transmitter and deliver the received wireless power to a load via a converter circuit, the method comprising:
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varying an ideal source voltage of the receiver at an input of the converter circuit monitoring changes in an ideal source current at the input of the converter circuit while varying the ideal source voltage; calculating, using receiver electronics at the receiver, a Thevenin equivalent impedance of the wireless power transfer system based on the monitored changes in the ideal source current at the input of the converter circuit; calculating, using the receiver electronics, a Thevenin equivalent source voltage of the wireless power transfer system based on the Thevenin equivalent impedance; and controlling the converter circuit, using the receiver electronics, based on the calculated Thevenin equivalent impedance and the calculated Thevenin equivalent source voltage, to control the ideal source voltage to vary an amount of the wireless power transferred from the transmitter to the receiver. - View Dependent Claims (16, 17, 18)
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Specification