Back-up power supply serving to compensate temporarily for main

Details Back-up power supply serving to compensate temporarily for main Back-up power supply serving to compensate temporarily for main

1997-12-04

2000-09-19

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 307 85, 323273, H02J 700

Patent

active

061216941

ABSTRACT:
The invention concerns a back-up power supply of the type serving to compensate temporarily for an absence of a DC input voltage (Ve) from a main power supply (15) by delivering a voltage that is higher than a threshold value (Vmin) to a load (10). The main power supply (15) delivers the DC input voltage (Ve) to the load (10) under normal operating conditions, the DC input voltage (Ve) being higher than the threshold value (Vmin), and lying in the range defined by a minimum input voltage (Ve1) and by a maximum input voltage (Ve2). The back-up power supply includes a capacitor (13) charged by the DC input voltage (Ve). According to the invention, the back-up power supply includes means (20, 21) for limiting the charge on the capacitor (13) to a reference voltage (Vr) that is lower than the maximum input voltage (Ve2). The invention makes it possible to reduce the size and the cost of the capacitor (13) of the back-up power supply.

REFERENCES:
patent: 4543522 (1985-09-01), Moreau
patent: 4560887 (1985-12-01), Schneider
patent: 4729083 (1988-03-01), Kyriakos
patent: 4779037 (1988-10-01), LoCascio
patent: 4890003 (1989-12-01), Seibert et al.
patent: 5111058 (1992-05-01), Martin
patent: 5136175 (1992-08-01), Losel
patent: 5277363 (1994-01-01), Hart
patent: 5280233 (1994-01-01), Poletto et al.
patent: 5796182 (1998-08-01), Martin
patent: 5828207 (1998-10-01), Saadeh

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