Power supply for an electronic device and power delivery method

Details Power supply for an electronic device and power delivery method Power supply for an electronic device and power delivery method

1996-04-05

1998-04-14

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307 65, 320 7, 320 43, 364273, 364492, H02J 700

Patent

active

057395969

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.

REFERENCES:
patent: 3666962 (1972-05-01), Bogue et al.
patent: 3757795 (1973-09-01), Anderson
patent: 4143283 (1979-03-01), Graf et al.
patent: 4281278 (1981-07-01), Bilsky et al.
patent: 4315162 (1982-02-01), Ferguson
patent: 5270946 (1993-12-01), Shibasaki et al.
patent: 5300874 (1994-04-01), Shimamato et al.
patent: 5422558 (1995-06-01), Stewart

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