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:
Jun. 30, 1998
Filed:
Aug. 12, 1997
Hideaki Nakanishi, Machida, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Disclosed is a compact power supply unit that prevents an electronic device from being shut down even when due to an in-rush current phenomenon the electronic device requires a supply of power that is extraordinarily greater than that which is needed for normal operation. A CV area where constant voltage feedback control is performed on an output terminal voltage until it reaches a level V.sub.1 is continued until an output current value is I.sub.1. Then, constant current feedback control is performed with the output current I.sub.1 until the output terminal voltage falls to V.sub.2 (<V.sub.1). Further, constant current feedback control is performed with the output current I.sub.2 (<I.sub.1) in the area where the output terminal voltage is lower than V.sub.2 (more specifically, in a battery charging area).