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:
Feb. 01, 2000
Filed:
Nov. 06, 1998
Eitaro Nishigaki, Tokyo, JP;
Yasuhei Shimada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A secondary battery unit which can supply constant power for a longer time with a lower input voltage and which is small, light, and suitable for portable use is provided. The secondary battery unit comprises plural inductors having different inductances, to which the first voltage is input; a rectifier inserted between the plural inductors and the output terminal; plural switches respectively connected to the plural inductors, each switch making current according to the first voltage flow through the connected inductor when the switch is operated; a switching controller for selectively operating one of the plural switches according to variation of the first voltage; and a controller for controlling timing of the above switching between the plural switches so as to stabilize a voltage from the output terminal to the predetermined second voltage.