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:
Dec. 23, 2014
Filed:
Aug. 29, 2012
Chien-ping LU, Tainan, TW;
Nien-hui Kung, Hsinchu, TW;
Li-wei Lee, New Taipei, TW;
Chia-hsiang Lin, Taipei, TW;
Chen-hsiang Hsiao, Pingzhen, TW;
Ko-ching Su, Hsinchu, TW;
Chien-Ping Lu, Tainan, TW;
Nien-Hui Kung, Hsinchu, TW;
Li-Wei Lee, New Taipei, TW;
Chia-Hsiang Lin, Taipei, TW;
Chen-Hsiang Hsiao, Pingzhen, TW;
Ko-Ching Su, Hsinchu, TW;
Richtek Technology Corporation, Hsin-Chu, TW;
Abstract
The present invention discloses a charge control circuit for supplying power from an external power source to a first common node and charging a second common node from the first common node. A regulator circuit is coupled between the external power source and the first common node, and a transistor is coupled between the first common node and the second common node. The present invention detects an operation parameter of the transistor and controls an internal voltage source to generate a non-predetermined voltage difference accordingly. When the sum of the voltage at the second common node and the non-predetermined voltage is equal to or higher than the reference voltage, the voltage at the first common node is regulated to a level higher than the voltage at the second common node, and the transistor is in an optimum conductive state.