Adaptive impedance control for wireless charging
First Claim
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1. An apparatus comprising:
- a transmission coil; and
a power amplifier comprising;
a controller; and
a memory, comprising instructions to cause the controller to;
determine electric current output of the power amplifier;
perform a lookup of load reactance range based on the electric current output;
detect load impedance of the transmission coil;
calculate reactance based on the load impedance;
determine if reactance is within the load reactance range; and
adjust reactance shift compensation to obtain a reactance that is within the load reactance range if the reactance is not within the load reactance range.
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Abstract
An apparatus is described. The apparatus includes a transmission coil and a power amplifier. The power amplifier includes a microcontroller and a memory. The memory includes instructions to determine electric current output of the power amplifier, perform a lookup of load reactance range based on target electric current, detect load impedance, calculate reactance based on the load impedance, determine if reactance is within the load reactance range, and adjust reactance shift compensation to bring the reactance within the load reactance range if the reactance is not within the load reactance range.
7 Citations
21 Claims
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1. An apparatus comprising:
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a transmission coil; and a power amplifier comprising; a controller; and a memory, comprising instructions to cause the controller to; determine electric current output of the power amplifier; perform a lookup of load reactance range based on the electric current output; detect load impedance of the transmission coil; calculate reactance based on the load impedance; determine if reactance is within the load reactance range; and adjust reactance shift compensation to obtain a reactance that is within the load reactance range if the reactance is not within the load reactance range. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
a differential power amplifier to; determine electric current output of the differential power amplifier; perform a lookup of load reactance range based on the electric current output; detect load impedance of a transmission coil associated with the differential power amplifier; calculate reactance based on the load impedance; determine if reactance is within the load reactance range; and adjust reactance shift compensation to bring the reactance within the load reactance range if the reactance is not within the load reactance range. - View Dependent Claims (9, 10, 11, 12)
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13. A method for adaptive impedance control for wireless charging, the method comprising:
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determining electric current output of a power amplifier; performing a lookup of load reactance range based on target electric current; detecting load impedance of a transmitting coil associated with the power amplifier; calculating reactance based on the load impedance; determining if reactance is within the load reactance range; and adjusting reactance shift compensation to bring the reactance within the load reactance range if the reactance is not within the load reactance range. - View Dependent Claims (14, 15, 16, 17)
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18. A non-transitory computer-readable medium for adaptive impedance control in wireless charging, the medium comprising instructions that cause a processor to:
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determine electric current output of a differential power amplifier; perform a lookup of load reactance range based on target electric current; detect load impedance of a transmission coil associated with the differential power amplifier; calculate reactance based on the load impedance; determine if reactance is within the load reactance range; and adjust reactance shift compensation to bring the reactance within the load reactance range if the reactance is not within the load reactance range, wherein the differential power amplifier comprises; a first leg comprising a first capacitor; and a second leg comprising a second capacitor, wherein a reactance is based on a combined reactance of the transmitting coil, the first capacitor and the second capacitor. - View Dependent Claims (19, 20, 21)
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Specification