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. 14, 1998
Filed:
Apr. 05, 1996
Seiko Epson Corporation, Tokyo, JP;
Abstract
An electronic apparatus comprises a main circuit having a main CPU and a power supply system which includes plural main batteries for supplying operating power to said main circuit, a back-up battery, a switching circuit connected between each main battery and the main circuit, power means for enabling the operation of the main circuit, a charge detector for detecting the charging level of each main battery, and power controller responsive to the power means and the charge detector and having a sub-CPU for individually controlling the switching circuit according to either a single connection mode or a multiple connection mode. In the single connection mode only one of the main batteries is connected to said main circuit. In the multiple connection mode, at least two main batteries, each in series with a respective diode means, are connected in parallel to the main circuit. The back-up battery is connected to supply power to the power controller only when either no main battery is installed or the charging level of each of the installed main batteries is below a predetermined value required for back-up operation.