Patent ID: 11862993
Assignee: UTAH STATE UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A wireless power transfer (“WPT”) charging apparatus comprising:
an inverter configured to connect with a direct current (“DC”) source on an input side; and
two or more WPT charging branches, each WPT charging branch comprising:
a WPT charging pad circuit comprising a WPT charging pad connected in series with a first series charging capacitor;
a parallel charging capacitor connected in parallel with the WPT charging pad circuit; and
a series charging impedance connected in series between an output of the inverter and a connection between the WPT charging pad circuit and the parallel charging capacitor, the series charging impedance comprising a second series charging capacitor and/or a series charging inductor,

wherein, for each of the two or more WPT charging branches, an inductance of the WPT charging pad and capacitance of the parallel charging capacitor are selected to operate at resonance at a switching frequency of the inverter in response to a WPT receiver pad being uncoupled with the WPT charging pad.