The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 2012
Filed:
May. 27, 2008
Julian Andrew John Fells, Horsham, GB;
Julian Andrew John Fells, Horsham, GB;
Access Business Group International LLC, Ada, MI (US);
Abstract
The specification discloses a wireless power charging system in which undesired frequencies in the primary coil are cancelled. Exemplary undesired frequencies are the harmonics of the primary coil drive signal. The system includes a sense transformer/coil, an injection transformer/coil, and a compensation signal generator. The sense transformer/coil senses the signal in the primary coil. The compensation signal generator receives the sensed signal and generates an injection signal whose constituent parts are equal in amplitude to, but pi phase different from, each undesired frequency. The combined signal is injected into the primary through the injection transformer/coil so that the injection signal cancels the undesired frequencies in the primary coil.