| CPC H02J 50/90 (2016.02) [H02J 50/10 (2016.02); H02J 50/40 (2016.02); H02J 50/80 (2016.02); H04B 5/79 (2024.01)] | 19 Claims |
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1. Apparatus for a wireless power transfer (WPT) receiver, the apparatus comprising:
a power output arranged to provide WPT-received electrical power to a load;
receiver (RX) path circuitry coupled to the power output and to a set of at least one reception coil, and operative to receive WPT via the set of at least one reception coil, from at least one WPT transmission coil of a WPT transmitter, the RX path circuitry including low-power RX path circuitry including power conditioning circuitry arranged to condition the WPT-received electrical power for delivery to the load, and high-power RX path circuitry arranged to condition the WPT-received electrical power for delivery to the load, the high-power RX circuitry including power conditioning circuitry suitable for higher-power levels than the low-power RX path circuitry, wherein the low-power RX path circuitry has components which differ from components of the high-power RX path circuitry, including a shunting reactance component that, together with a reception coil of the set of at least one reception coil, provides a resonance characteristic which is operative to enable resonant power transfer from the at least one WPT transmission coil of the WPT transmitter to the set of the at least one reception coil, wherein current of the resonant power transfer counteracts magnetization current of the at least one WPT transmission coil thereby causing the low-power RX path circuitry to be operative at a greater efficiency than the high-power RX path circuitry at any power level for which the low-power RX path circuitry is suitable, wherein the high-power RX path circuitry lacks a shunting reactance component such that the high-power RX path circuitry does not have the resonant power transfer;
communication circuitry electrically coupled to the set of at least one reception coil and operative to send and receive wireless communications via the set of at least one reception coil, the communication circuitry being distinct from the load; and
controller circuitry operatively coupled to the communication circuitry and to the RX path circuitry, the controller circuitry operative to negotiate with a WPT power source a power level of the WPT power source from among a low power level and a high power level, and to select RX path circuitry from among the low-power RX path circuitry and the high-power RX path circuitry, based on the negotiated power level of the WPT power source, with which to receive WPT power from the WPT power source.
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