ANTENNA ARRAY CALIBRATION FOR WIRELESS CHARGING
First Claim
1. A wireless charging station, comprising:
- a plurality of antenna elements each comprising;
a receiver and a transmitter coupled to an antenna; and
a phase shift circuitry coupled to the transmitter and configured to adjust transmitter phase of the transmitter; and
a controller coupled to the plurality of antenna elements and configured to;
select a reference antenna element from the plurality of antenna elements wherein unselected ones of the plurality of antenna elements are non-reference antenna elements; and
for each of the non-reference antenna elements;
transmit a first calibration signal from a transmitter of the reference antenna element;
measure phase ax of the first calibration signal at a receiver of the reference antenna element;
measure phase bx of the first calibration signal at a receiver of a non-reference antenna element;
transmit a second calibration signal from a transmitter of the non-reference antenna element;
measure phase ay of the second calibration signal at the receiver of the non-reference antenna element;
measure phase by of the second calibration signal at the receiver of the reference antenna element; and
determine relative receiver phase error and relative transmitter phase error between the non-reference antenna element and the reference antenna element based on the phase ax, the phase ay, the phase bx, and the phase by.
2 Assignments
0 Petitions
Accused Products
Abstract
Antenna array calibration for wireless charging is disclosed. In one aspect, an initial calibration sequence is performed each time a wireless charging station is powered on. The initial calibration sequence utilizes a reference antenna element, which is an antenna element randomly selected from a plurality of antenna elements in the wireless charging station, to determine relative receiver phase errors between the reference antenna element and each of the other antenna elements in an antenna array. In another aspect, a training sequence is performed after completing the initial calibration sequence to determine total relative phase errors between the reference antenna element and each of the other antenna elements in the antenna array. Adjustments can then be made to match respective total relative phase errors among the plurality of antenna elements to achieve phase coherency among the plurality of antenna elements for improved wireless charging power efficiency.
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Citations
20 Claims
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1. A wireless charging station, comprising:
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a plurality of antenna elements each comprising; a receiver and a transmitter coupled to an antenna; and a phase shift circuitry coupled to the transmitter and configured to adjust transmitter phase of the transmitter; and a controller coupled to the plurality of antenna elements and configured to; select a reference antenna element from the plurality of antenna elements wherein unselected ones of the plurality of antenna elements are non-reference antenna elements; and for each of the non-reference antenna elements; transmit a first calibration signal from a transmitter of the reference antenna element; measure phase ax of the first calibration signal at a receiver of the reference antenna element; measure phase bx of the first calibration signal at a receiver of a non-reference antenna element; transmit a second calibration signal from a transmitter of the non-reference antenna element; measure phase ay of the second calibration signal at the receiver of the non-reference antenna element; measure phase by of the second calibration signal at the receiver of the reference antenna element; and determine relative receiver phase error and relative transmitter phase error between the non-reference antenna element and the reference antenna element based on the phase ax, the phase ay, the phase bx, and the phase by. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification