Patent ID: 9620986
Date: 2017-04-11
CPC Classifications: H02J

Claim:
1. An apparatus for wirelessly transferring charging power via a wireless field, comprising: a first driver circuit having a first output impedance and configured to drive a plurality of couplers with a first current having a first phase to generate the wireless field; a second driver circuit configured to drive the plurality of couplers with a second current having a second phase; and a controller configured to: cause the second driver circuit to sequentially drive each of the plurality of couplers with the second current while causing the first driver circuit to simultaneously drive the other couplers of the plurality of couplers with the first current, identify a subset of the plurality of couplers based on detecting a change from the first output impedance in response to each of the plurality of couplers being sequentially driven with the second current, and selectively energize the subset of the plurality of couplers via one or both of the first and second driver circuits to wirelessly transfer the charging power.