ANTENNA ARRAY CALIBRATION FOR WIRELESS CHARGING
First Claim
1. A wireless charging system, comprising:
- a wireless charging station comprising;
a plurality of antenna elements configured to transmit a plurality of wireless radio frequency (RF) charging signals, respectively; and
a controller coupled to the plurality of antenna elements;
a wireless charging device configured to communicate a feedback signal to the wireless charging station, wherein the feedback signal indicates a total RF power received by the wireless charging device in the plurality of wireless RF charging signals; and
for each antenna element among the plurality of antenna elements in the wireless charging station, the controller is configured to;
record the total RF power indicated in the feedback signal as a first power parameter;
adjust a transmitter phase of the antenna element by a specified phase degree;
receive the feedback signal from the wireless charging device and record the total RF power indicated by the feedback signal as a second power parameter; and
while the second power parameter is greater than the first power parameter;
record the second power parameter as the first power parameter;
adjust the transmitter phase of the antenna element by the specified phase degree; and
receive the feedback signal from the wireless charging device and record the total RF power indicated by the feedback signal as the second power parameter.
2 Assignments
0 Petitions
Accused Products
Abstract
Antenna array calibration for wireless charging is disclosed. A wireless charging system is provided and configured to calibrate antenna elements in a wireless charging station based on a feedback signal provided by a wireless charging device. The antenna elements in the wireless charging station transmit wireless radio frequency (RF) charging signals to the wireless charging device. The wireless charging device provides the feedback signal to the wireless charging station to indicate total RF power in the wireless RF charging signals. The wireless charging station is configured to adjust transmitter phases associated with the antenna elements based on the feedback signal until the total RF power in the wireless RF charging signals is maximized. By calibrating the antenna elements based on the feedback signal, it is possible to achieve phase coherency among the antenna elements without requiring factory calibration.
110 Citations
20 Claims
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1. A wireless charging system, comprising:
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a wireless charging station comprising; a plurality of antenna elements configured to transmit a plurality of wireless radio frequency (RF) charging signals, respectively; and a controller coupled to the plurality of antenna elements; a wireless charging device configured to communicate a feedback signal to the wireless charging station, wherein the feedback signal indicates a total RF power received by the wireless charging device in the plurality of wireless RF charging signals; and for each antenna element among the plurality of antenna elements in the wireless charging station, the controller is configured to; record the total RF power indicated in the feedback signal as a first power parameter; adjust a transmitter phase of the antenna element by a specified phase degree; receive the feedback signal from the wireless charging device and record the total RF power indicated by the feedback signal as a second power parameter; and while the second power parameter is greater than the first power parameter; record the second power parameter as the first power parameter; adjust the transmitter phase of the antenna element by the specified phase degree; and receive the feedback signal from the wireless charging device and record the total RF power indicated by the feedback signal as the second power parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for calibrating a plurality of antenna elements in a wireless charging station, comprising:
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transmitting a plurality of wireless radio frequency (RF) charging signals from a plurality of antenna elements; communicating a feedback signal that indicates a total RF power received in the plurality of wireless RF charging signals; and for each antenna element among the plurality of antenna elements in a wireless charging station; receiving the feedback signal from a wireless charging device and recording the total RF power indicated by the feedback signal as a first power parameter; adjusting a transmitter phase of the antenna element by a specified phase degree; receiving the feedback signal from the wireless charging device and recording the total RF power indicated by the feedback signal as a second power parameter; and while the second power parameter is greater than the first power parameter; recording the second power parameter as the first power parameter; adjusting the transmitter phase of the antenna element by the specified phase degree; and receiving the feedback signal from the wireless charging device and recording the total RF power indicated by the feedback signal as the second power parameter. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification