Patent ID: 11914094
Assignee: WITRICITY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  B  H  Y | IPC B  G  H

Claim 0:
1. A detection circuit for detecting an object in a wireless power transfer system, the detection circuit comprising:
a sense element;
a reactance-compensating element in series with the sense element to form a series circuit configured to provide a series resonance substantially at a nominal sense frequency of the detection circuit;
a parallel inductor in parallel with the series circuit and configured to attenuate a low frequency disturbance component in a voltage across the series circuit at a frequency substantially lower than the nominal sense frequency of the detection circuit; and
a parallel capacitor in parallel with the series circuit and configured to:
provide parallel resonance together with the parallel inductor at the nominal sense frequency; and
attenuate a high frequency disturbance component in the voltage across the series circuit at a frequency substantially higher than the nominal sense frequency of the detection circuit, the high frequency disturbance component generated by a communication system that is coupled to the wireless power transfer system and that runs at a frequency substantially higher than the nominal sense frequency.