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

Claim 13:
14. A wireless power transmission system comprising:
a primary wireless power transfer structure;
a communication system running at a first frequency;
a detection circuit for detecting an object, 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, the first frequency of the communication system being substantially higher than the 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 the communication system at the first frequency.