Method for wireless charging power control
First Claim
1. A method for wireless charging power control comprising:
- determining an effective charging power in a direct-current (DC) charging signal that charges a battery, wherein the DC charging signal is generated by a radio frequency (RF) power harvesting circuit to have the effective charging power proportional to a total RF power received in a wireless RF charging signal received from a wireless charging station;
generating a battery charging signal indication (BCSI) in response to;
determining a target charging power required by the battery based on a charging profile of the battery;
comparing the effective charging power against the target charging power required by the battery; and
the determined effective charging power in the DC charging signal being different from the target charging power without adjusting the effective charging power in the DC charging signal by adjusting settings of the RF power harvesting circuit; and
sending the BCSI to the wireless charging station to control the total RF power associated with the RF wireless charging signal, wherein the BCSI is sent to the wireless charging station via an antenna switch configured to couple an antenna to the RF power harvesting circuit and one of a plurality of RF paths configured to transmit the BCSI on various RF spectrums of an Industrial, Scientific, and Medical (ISM) band.
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Accused Products
Abstract
A method for wireless charging power control is disclosed. In a wireless charging system, a wireless radio frequency (RF) charging signal transmitted by a wireless charging station is harvested and converted to a direct-current (DC) charging signal to charge a battery. To prevent overcharging damage to the battery, an effective charging power in the DC charging signal is measured and compared to a target charging power required by the battery. A battery charging signal indication (BCSI) is provided to the wireless charging station to decrease the effective charging power if the effective charging power is greater than the target charging power, or to increase the effective charging power if the effective charging power is less than the target charging power. By dynamically adjusting the effective charging power, it is possible to provide fast charging to the battery while protecting the battery from overcharging damage.
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Citations
18 Claims
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1. A method for wireless charging power control comprising:
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determining an effective charging power in a direct-current (DC) charging signal that charges a battery, wherein the DC charging signal is generated by a radio frequency (RF) power harvesting circuit to have the effective charging power proportional to a total RF power received in a wireless RF charging signal received from a wireless charging station; generating a battery charging signal indication (BCSI) in response to; determining a target charging power required by the battery based on a charging profile of the battery; comparing the effective charging power against the target charging power required by the battery; and the determined effective charging power in the DC charging signal being different from the target charging power without adjusting the effective charging power in the DC charging signal by adjusting settings of the RF power harvesting circuit; and sending the BCSI to the wireless charging station to control the total RF power associated with the RF wireless charging signal, wherein the BCSI is sent to the wireless charging station via an antenna switch configured to couple an antenna to the RF power harvesting circuit and one of a plurality of RF paths configured to transmit the BCSI on various RF spectrums of an Industrial, Scientific, and Medical (ISM) band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for wireless charging power control comprising:
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comparing an effective charging power in a direct-current (DC) charging signal, which is generated by a radio frequency (RF) power harvesting circuit to charge a battery based on a total RF power in a wireless RF charging signal received from a wireless charging station, against a target charging power required by the battery; reducing the effective charging power in the DC charging signal generated by the RF power harvesting circuit without sending a battery charging signal indication (BCSI) to the wireless charging station to decrease the total RF power associated with the wireless RF charging signal if the effective charging power is greater than the target charging power, wherein the BCSI is configured to be sent to the wireless charging station via an antenna switch configured to couple an antenna to the RF power harvesting circuit and one of a plurality of RF paths configured to transmit the BCSI on various RF spectrums of an Industrial, Scientific, and Medical (ISM) band; and increasing the effective charging power in the DC charging signal generated by the RF power harvesting circuit independent of sending the BCSI to the wireless charging station to increase the total RF power associated with the wireless RF charging signal if the effective charging power is less than the target charging power. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification