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:
Nov. 18, 2014
Filed:
Oct. 06, 2009
Applicants:
Nien-hui Kung, HsinChu, TW;
Kwan-jen Chu, Hsinchu, TW;
Inventors:
Nien-Hui Kung, HsinChu, TW;
Kwan-Jen Chu, Hsinchu, TW;
Assignee:
Richtek Technology Corporation, R.O.C., Hsin-Chu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J 7/04 (2006.01); H02J 7/00 (2006.01);
U.S. Cl.
CPC ...
H02J 7/0072 (2013.01);
Abstract
A charger circuit comprising: a charging path coupled between an input voltage and a battery; a power switch on the charging path; a switch control circuit controlling the power switch; a timer counting a charging period; and a low current control circuit issuing a signal to the switch control circuit to control the power switch such that a charging current is maintained to be a predetermined low current when the timer counts to a predetermined maximum charging period.