WIRELESS POWER TRANSMITTER TUNING

摘要

This disclosure provides systems, methods and apparatus for tuning a wireless power transmitter (1404). In one aspect an apparatus (1406) configured to wirelessly provide power to a load is provided. The apparatus (1406) includes a transmit circuit (1450) including a transmit coil (1414). The transmit circuit (1450) is configured to wirelessly provide power to the load. The transmit coil (1414) is configured to resonate at a resonant frequency. The transmit circuit (1450) has a reactance. The apparatus (1406) further includes a detection circuit (1480) configured to detect a change in the resonant frequency while providing power to the load. The apparatus (1406) further includes a tuning circuit (852) configured to adjust the reactance based on the change.