SYSTEMS AND METHODS FOR BI-STATE IMPEDANCE CONVERSION IN WIRELESS POWER TRANSFER

摘要

One aspect provides a wireless power transmitter. The wireless power transmitter includes a transmit antenna configured to generate a field for wireless transmit power in both a first and second configuration. The wireless power transmitter further includes a first capacitor. The wireless power transmitter further includes at least one switch configured to selectively connect the first capacitor in one of the first and second configuration, the first capacitor being in parallel with the transmit antenna in the first configuration and in series with the transmit antenna in the second configuration. The wireless power transmitter further includes a second capacitor in parallel with the transmit antenna and a transformer configured to operate at a first turns-ratio in the first configuration and a second turns-ratio in the second configuration, the first turns-ratio being lower than the second turns-ratio.

主权项

1. A wireless power transmitter comprising:
a transmit antenna configured to generate a field for wireless transmit power in both a first and second configuration; a first capacitor; at least one switch configured to selectively connect the first capacitor in one of the first and second configuration, the first capacitor being in parallel with the transmit antenna in the first configuration and in series with the transmit antenna in the second configuration; a second capacitor in parallel with the transmit antenna; and a transformer configured to operate at a first turns-ratio in the first configuration and a second turns-ratio in the second configuration, the first turns-ratio being lower than the second turns-ratio.