Power Amplifier for Wireless Power Transmission

摘要

A power signal source may provide current to a transmit coil to support wireless power transmission. The power signal source may include one or more modulators in parallel that may be phase delayed by an angle with respect to one another. The phase delay angle allows for adjustment of the magnitude of the current. The current provided to the transmit coil may be independent of the load of the transmit coil.

主权项

1. A device, comprising:
a power supply input configured to provide a power supply signal; the first path configured to receive a clock signal and the power supply signal, the first path comprising:
a first output;a first driver configured to accept the clock signal and modulate the power supply signal to generate, on the first output, a first oscillating power signal based on the clock signal; the second path configured to receive the clock signal and the power supply signal, the second path comprising:
a second output;a delay element configured to phase shift the clock signal by an angle to generate a shifted clock signal; anda second driver configured to accept the shifted clock signal and modulate the power supply signal to generate, on the second output, a second oscillating power signal phase shifted by the angle with respect to the first oscillating power signal; and a transmission circuit coupled to the first output and second output and configured to transmit a wireless power signal based on a combination of the first and second oscillating power signals.