Closed loop current control in a wireless power system
First Claim
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1. A wireless power transmitter, comprising:
- a first controller configured to set a target coil current value based, at least in part, on a voltage value reported by a wireless power receiver;
an amplifier configured to generate a transmitter coil current based, at least in part, on a supply voltage received by the amplifier; and
a second controller configured to adjust the supply voltage received by the amplifier based, at least in part, on a comparison of a value of the transmitter coil current to the target coil current value.
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Abstract
Methods and apparatus for providing closed loop current control in a wireless power transmitter. The method comprises adjusting a transmitter coil current generated by the wireless power transmitter based, at least in part, on first feedback reported by at least one wireless power receiver and second feedback based on a measurement of the transmitter coil current.
23 Citations
20 Claims
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1. A wireless power transmitter, comprising:
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a first controller configured to set a target coil current value based, at least in part, on a voltage value reported by a wireless power receiver; an amplifier configured to generate a transmitter coil current based, at least in part, on a supply voltage received by the amplifier; and a second controller configured to adjust the supply voltage received by the amplifier based, at least in part, on a comparison of a value of the transmitter coil current to the target coil current value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless charging system, comprising:
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a wireless charging pad including a wireless charging transmitter formed therein; and at least one wireless power receiver configured to be coupled to the wireless charging transmitter when placed on the wireless charging pad; wherein the wireless charging transmitter includes; a current sense transformer configured to measure a value of the transmitter coil current generated by the wireless power transmitter; and at least one controller coupled to the current sense transformer via a comparison element configured to generate a current error value based on a comparison of the value of the transmitter coil current measured by the current sense transformer and a set target coil current value determined based on first feedback reported by the at least one wireless power receiver, wherein the at least one controller is configured to adjust a transmitter coil current generated by the wireless charging transmitter based, at least in part, on the current error value. - View Dependent Claims (13, 14, 15)
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16. A method of providing closed loop current control in a wireless power transmitter, the method comprising:
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measuring a value of a transmitter coil current generated by the wireless power transmitter; generating a current error value based on a comparison of the value of the transmitter coil current and a set target coil current value determined based on first feedback reported by at least one wireless power receiver; and adjusting the transmitter coil current generated by the wireless power transmitter based, at least in part, on the current error value. - View Dependent Claims (17, 18, 19)
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20. A method of providing closed loop current control in a wireless power transmitter, the method comprising:
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setting a target coil current value based, at least in part, on a rectified voltage error between a rectified voltage value reported by a wireless power receiver and a set voltage value; generating a supply voltage based, at least in part, on a current error between a measured value of a transmitter coil current and the set target coil current value; and providing the supply voltage to an amplifier to generate an adjusted transmitter coil current.
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Specification