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. 05, 2005
Filed:
Apr. 09, 2004
Liang-pin Tai, Tainan, TW;
Shwu-liang Hsieh, Taichung, TW;
Hung-i Wang, Changhua, TW;
Jing-meng Liu, Hsinchu, TW;
Liang-Pin Tai, Tainan, TW;
Shwu-Liang Hsieh, Taichung, TW;
Hung-I Wang, Changhua, TW;
Jing-Meng Liu, Hsinchu, TW;
Richtek Technology Corp., Hsinchu, TW;
Abstract
A current sense apparatus and method comprises a common drain DMOSFET and a MOSFET connected in series between a high voltage and a low voltage to serve as an output stage. The DMOSFET produces a phase output current, a mirror current mirrored from the phase output current, and a sense voltage. A servo amplifier is connected with the mirror current and sense voltage to produce a current sense signal. Due to the mirror current from the DMOSFET proportional to the phase output current, the current sense apparatus senses the phase output current in a temperature independent manner.