Patent ID: 9589721
Date: 2017-03-07
CPC Classifications: H01F,H02J,H04B

Claim:
1. A wireless power supply transmitter configured to transmit an electric power signal comprising any one from among an electric field, a magnetic field, and an electromagnetic field to a wireless power receiver, the wireless power supply transmitter comprising: a transmission antenna comprising a transmission coil; a power supply configured to apply an AC driving voltage between both ends of the transmission antenna; and an automatic tuning assist circuit coupled with the transmission antenna, and configured to inject a first correction current into, or otherwise to draw a first correction current from, the transmission antenna, wherein the automatic tuning assist circuit comprises a first auxiliary coil, and wherein the automatic tuning assist circuit is configured to alternately switch between (1) a state in which the first auxiliary coil is coupled with the transmission antenna, and the first correction current that corresponds to a current that flows through the first auxiliary coil is injected into or otherwise drawn from the transmission antenna, and (2) a state in which the first auxiliary coil is decoupled from the transmission antenna, and the current that flows through the first auxiliary coil flows through a current path which is independent of the transmission antenna.