Radio frequency (RF) power harvesting circuit
First Claim
1. A wireless charging circuit comprising:
- a radio frequency (RF) power harvesting circuit configured to;
receive a wireless RF charging signal having a total RF power from a wireless charging station; and
generate a direct-current (DC) charging signal having an effective charging power based on the wireless RF charging signal received from the wireless charging station to charge a battery; and
a wireless charging controller configured to;
determine a target charging power required by the battery based on a charging profile of the battery;
compare the effective charging power in the DC charging signal against the target charging power required by the battery;
reduce the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal if the effective charging power is greater than the target charging power; and
increase the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal if the effective charging power is less than the target charging power.
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Accused Products
Abstract
Aspects disclosed in the detailed description include a wireless charging circuit comprising a radio frequency (RF) power harvesting circuit. In one aspect, the RF power harvesting circuit is configured to harvest a wireless RF charging signal provided by a wireless charging station to generate a direct-current (DC) charging signal to charge a battery, for example, a lithium-ion (Li-ion) battery, in a battery-operated electronic device. In another aspect, a wireless charging controller controls the RF power harvesting circuit to dynamically increase or decrease an effective charging power of the DC charging signal according to a target charging power determined according to a charging profile of the battery. By dynamically adjusting the effective charging power provided to the battery according to the charging profile of the battery, it is possible to provide fast charging to the battery while protecting the battery from overcharging damage.
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Citations
20 Claims
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1. A wireless charging circuit comprising:
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a radio frequency (RF) power harvesting circuit configured to; receive a wireless RF charging signal having a total RF power from a wireless charging station; and generate a direct-current (DC) charging signal having an effective charging power based on the wireless RF charging signal received from the wireless charging station to charge a battery; and a wireless charging controller configured to; determine a target charging power required by the battery based on a charging profile of the battery; compare the effective charging power in the DC charging signal against the target charging power required by the battery; reduce the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal if the effective charging power is greater than the target charging power; and increase the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal if the effective charging power is less than the target charging power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless charging circuit comprising:
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a radio frequency (RF) power harvesting circuit configured to; receive a wireless RF charging signal having a total RF power from a wireless charging station; and generate a direct-current (DC) charging signal having an effective charging power based on the wireless RF charging signal received from the wireless charging station to charge a battery; and a wireless charging controller configured to; determine a target charging power required by the battery based on a charging profile of the battery; and adjust the effective charging power in the DC charging signal without affecting the total RF power in the wireless RF charging signal based on measurement of the effective charging power and the determined target charging power required by the battery. - View Dependent Claims (18, 19, 20)
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Specification