Power receiver having magnetic signature and method for operating same
First Claim
Patent Images
1. A power transmitter having a transmitting coil and configured to:
- transmit a power pulse to a power receiver via contactless electromagnetic coupling with a receiving coil of the power receiver;
receive a reflected magnetic signal from the power receiver via contactless electromagnetic coupling with the receiving coil of the power receiver, the reflected magnetic signal having a duration;
determine the duration of the reflected magnetic signal; and
determine an identity of the power receiver based on the duration of the reflected magnetic signal.
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Accused Products
Abstract
There is provided a contactless power system, power receiver and method of operating such, in which the power receiver of the system is configured to receive power transmitted by a power transmitter of the system via contactless electromagnetic coupling of respective receiving and transmitting coils. The power receiver further has circuitry for reflecting a unique magnetic signal to the transmitting coil of the power transmitter upon receipt of a power pulse by the receiver coil of the power receiver.
7 Citations
13 Claims
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1. A power transmitter having a transmitting coil and configured to:
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transmit a power pulse to a power receiver via contactless electromagnetic coupling with a receiving coil of the power receiver; receive a reflected magnetic signal from the power receiver via contactless electromagnetic coupling with the receiving coil of the power receiver, the reflected magnetic signal having a duration; determine the duration of the reflected magnetic signal; and determine an identity of the power receiver based on the duration of the reflected magnetic signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power receiver having a receiving coil and configured to receive a power pulse transmitted by a power transmitter via contactless electromagnetic coupling with a transmitting coil of the power transmitter, wherein the power receiver comprises:
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preload circuitry for reflecting a magnetic signal to the transmitting coil upon receipt of the power pulse, wherein the preload circuitry of the power receiver comprises one or more resistors, one or more capacitors and a switchable load, wherein the switchable load is configured to switchably sink an amount of energy produced in the power receiver with the received power pulse for an amount of time in order to provide the magnetic signal, and wherein the amount of time is based on the resistance of the one or more resistors and the capacitance of the one or more capacitors. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification