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:
Apr. 17, 2012
Filed:
Mar. 10, 2009
Chien-ping LU, Tainan, TW;
Nien-hui Kung, HsinChu, TW;
Li-wei Lee, Jhubei, TW;
Kwan-jen Chu, HsinChu, TW;
Ying-hsin Hsing, Taipei, TW;
Chun-tsung Chen, Taipei, TW;
Chien-Ping Lu, Tainan, TW;
Nien-Hui Kung, HsinChu, TW;
Li-Wei Lee, Jhubei, TW;
Kwan-Jen Chu, HsinChu, TW;
Ying-Hsin Hsing, Taipei, TW;
Chun-Tsung Chen, Taipei, TW;
Richtek Technology Corporation, Hsin-Chu, TW;
Abstract
The present invention discloses an overvoltage protection (OVP) circuit for use in a charger circuit system, comprising: a power transistor electrically connected between a voltage supply and a battery; an OVP circuit which turns off the transistor when a voltage supply exceeds a threshold value; and a multiplexing circuit electrically connected between an output of the OVP circuit and the gate of the transistor. The present invention also discloses a charger circuit with an OVP function, comprising: a single power transistor electrically connected between a voltage supply and a battery; an OVP control circuit which turns off the power transistor when a voltage supply exceeds a threshold value; and a charger control circuit which controls the gate of the power transistor to determine a charge current to the battery when the voltage supply does not reach the threshold value.