Wireless power receiver with a synchronous rectifier
AssigneeEnergous Corporation
InventorMichael A. Leabman
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Abstract
Embodiments disclosed herein describe a wireless power receiver including a synchronous rectifier using a Class-E or a Class-F amplifier. The voltage waveform generated from a power source, for example an antenna, is tapped to create a feed-forward tap-line to provide a gate voltage to the transistor of the Class-E or the Class-F amplifier. In some instances, a constant phase shift across the feed-forward tap-line may be provided using a micro-strip of a predetermined length that is selected such that the transistor switches at the zero-crossings of the voltage waveform arriving at the drain terminal of the transmitter. In other instances, a feed-forward circuit is used for controlling the phase across the feed-forward loop.
Claims20
A wireless power receiver, comprising:
- at least one radio frequency (RF) antenna configured to generate an alternating current (AC) waveform from received RF waves;
- and
- a field effect transistor (FET) comprising:
- a source terminal configured to be electrically coupled to ground;
- a drain terminal electrically coupled to the at least one antenna;
- and
- a gate terminal configured to be driven by a feed-forward signal tapped from the AC waveform generated by the at least one antenna.
A method of receiving wireless power comprising:
- receiving radio frequency (RF) waves at a RF antenna;
- generating an alternating current (AC) waveform from the RF waves;
- receiving by a drain terminal of a field effect transistor (FET) the AC waveform;
- and
- receiving, by a gate terminal of the FET of the wireless power receiver, a feed-forward signal tapped from the AC waveform, wherein the feed-forward signal biases the FET to operate as an open switch such that a connected load receives a direct current (DC) waveform during a positive cycle of the AC waveform.
Dependencies are inferred from the claim text.