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. 24, 2012
Filed:
Nov. 09, 2007
Wing Choi Ho, Tung Chung, HK;
Chi Kwan Lee, Tuen Mun, HK;
Ron Shu Yuen Hui, Shatin, HK;
Shu Hung Chung, Hong Kong, HK;
Wing Choi Ho, Tung Chung, HK;
Chi Kwan Lee, Tuen Mun, HK;
Ron Shu Yuen Hui, Shatin, HK;
Shu Hung Chung, Hong Kong, HK;
City University of Hong Kong, Kowloon, HK;
Abstract
This invention provides an electronic control method for a planar inductive battery charging apparatus on which one or more electronic loads such as mobile phones, MP3 players etc can be placed and charged simultaneously. The power control circuit of the charging pad consists of two power conversion stages. Depending on the nature of the input power supply, the first power stage is an AC-DC power converter with variable output voltage control and a second stage is a DC-AC power inverter with constant current control. The combination of the two stages provides power control of the charging pad and generates AC magnetic flux of ideally constant magnitude over the charging areas within a group of primary windings that are excited.