| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wireless power feeder capable of automatically tuning a resonance frequency. <P>SOLUTION: An automatic tuning auxiliary circuit 30 is coupled to a transmission antenna 20, and injects a first correction current I<SB POS="POST">A</SB>to the transmission antenna 20 or extracts the first correction current I<SB POS="POST">A</SB>from the transmission antenna 20. In a first state ϕ1, a first auxiliary coil L<SB POS="POST">A1</SB>is coupled to the transmission antenna 20, and the first correction current I<SB POS="POST">A</SB>in accordance with a current flowing in the first auxiliary coil L<SB POS="POST">A1</SB>is injected to the transmission antenna 20 or extracted from the transmission antenna 20. In a second state ϕ2, the first auxiliary coil L<SB POS="POST">A1</SB>is disconnected from the transmission antenna 20, and a current I<SB POS="POST">LA1</SB>flowing in the first auxiliary coil L<SB POS="POST">A1</SB>flows in a current path which is independent of the transmission antenna 20. The first state ϕ1 and the second state ϕ2 are switched at the same frequency as a frequency of a driving voltage V<SB POS="POST">DRV</SB>. <P>COPYRIGHT: (C)2013,JPO&INPIT |
