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:
Jul. 07, 2015
Filed:
Jun. 01, 2011
Gianpaolo Lisi, Campbell, CA (US);
Gerard G. Socci, Palo Alto, CA (US);
Ali Kiaei, San Jose, CA (US);
Kosha Mahmodieh, Hayward, CA (US);
Ali Djabbari, Saratoga, CA (US);
Gianpaolo Lisi, Campbell, CA (US);
Gerard G. Socci, Palo Alto, CA (US);
Ali Kiaei, San Jose, CA (US);
Kosha Mahmodieh, Hayward, CA (US);
Ali Djabbari, Saratoga, CA (US);
NATIONAL SEMICONDUCTOR CORPORATION, Santa Clara, CA (US);
Abstract
A wireless charging system includes a transmitter with tunable reactive components (such as capacitance or inductance). A metric related to power transfer from the transmitter through a coil is used to determine an amount to modify a Parameter. One metric is equal to |Vs|·|Is|·cos(φ)·(Vcoil_ref/Vcoil), where |Vs| is magnitude of the power source voltage, |Is| is magnitude of the power source current, φ is phase difference between the power source voltage and power source current, Vcoil_ref is a normalization value, and Vcoil is voltage across the coil. The transmitter can further include a phase tracking and adjustment loop (such as a phase-locked loop).