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:
Jul. 15, 2003
Filed:
Dec. 14, 2001
Sheng-Nan Tsai, Taoyuan, TW;
Delta Electronics, Inc., , TW;
Abstract
An isolation device feasible for protecting a parallelable power supply from a reverse current comprises a field-effect transistor (FET) coupled in series between a voltage output terminal of the parallelable power supply and a load, and a transistor control circuit including a voltage comparator for detecting if a reverse current is flowing through the FET, a duty comparator circuit for detecting if an infinitesimal reverse current which is undetectable by the voltage comparator circuit is flowing through the FET, a transistor driving circuit for performing a logic AND operation with an output state of the voltage comparator circuit and an output state of the duty comparator circuit to drive the FET to turn on or off in response to the result of the logic AND operation, and an auxiliary circuit for driving the FET to turn off when the parallelable power supply is short-circuited.