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:
Feb. 19, 2013
Filed:
Dec. 07, 2009
Li-wei Lee, Zhubei, TW;
Nien-hui Kung, Hsinchu, TW;
Kwan-jen Chu, Hsinchu, TW;
Hsuan-kai Wang, Banqiao, TW;
Li-Wei Lee, Zhubei, TW;
Nien-Hui Kung, Hsinchu, TW;
Kwan-Jen Chu, Hsinchu, TW;
Hsuan-Kai Wang, Banqiao, TW;
Richtek Technology Corp., ChuPei, TW;
Abstract
A charging circuit with an application system thereof provides an error amplifier to control a transistor switch for controlling the charging power source to charges the battery. When the voltage difference between the power source and load terminals of the transistor switch drops along with the transistor switch being turned on, the output voltage of the error amplifier changes as well to increase the turning-on resistance of the transistor switch such that the voltage difference between the power source and load terminals is capable of maintaining at a value above a certain reference level for avoiding the unstable state resulting from the charging circuit being turned on and off frequently.