Systems and methods for controlling output power of a wireless power transmitter
First Claim
Patent Images
1. A wireless power transmitter comprising:
- a wireless power transmit circuit configured to conduct a transmit circuit current and transmit power to a wireless power receiver via an electromagnetic field;
a sensor configured to sense a level of the transmit circuit current and generate a sensing signal; and
a controller configured to receive a receiver feedback signal from the wireless power receiver and further configured to adjust a component of the transmit circuit based on the sensing signal and based at least in part on the receiver feedback signal to maintain the transmit circuit current at a substantially constant level.
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Abstract
Systems and methods for feedback control of output power in a wireless power transmitter are disclosed. According to one aspect, one of a voltage level at an input of a wireless power transmit coil and a level of current passing through the wireless power transmit coil are sensed. The wireless power transmitter includes a controller configured to adjust a component of the wireless power transmitter to maintain at least one of the level of current and the voltage level at a constant level.
35 Citations
24 Claims
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1. A wireless power transmitter comprising:
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a wireless power transmit circuit configured to conduct a transmit circuit current and transmit power to a wireless power receiver via an electromagnetic field; a sensor configured to sense a level of the transmit circuit current and generate a sensing signal; and a controller configured to receive a receiver feedback signal from the wireless power receiver and further configured to adjust a component of the transmit circuit based on the sensing signal and based at least in part on the receiver feedback signal to maintain the transmit circuit current at a substantially constant level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for transferring power via a wireless field comprising:
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transmitting power from a wireless power transmitter to a wireless power receiver via an electromagnetic field, the wireless power transmitter including a transmit circuit conducting a transmit circuit current; receiving a receiver feedback signal from the wireless power receiver, sensing a level of the transmit circuit current; and adjusting a component of the transmit circuit based on the sensed level of transmit circuit current and based at least in part on the receiver feedback signal to maintain the transmit circuit current at a substantially constant level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for transferring power via a wireless field comprising:
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means for transmitting power from a wireless power transmitter to a wireless power receiver via an electromagnetic field; means for receiving a receiver feedback signal from the wireless power receiver; means for sensing a level of a current passing through the means for transmitting power; and means for adjusting a component of the transmitter based on the sensed level and based at least in part on the receiver feedback signal to maintain the current through the means for transmitting power at a substantially constant level. - View Dependent Claims (24)
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Specification