Power supply apparatus with a back-up power unit

Details Power supply apparatus with a back-up power unit Power supply apparatus with a back-up power unit

1995-11-01

1997-03-18

Nguyen, Matthew V.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 363 65, H02J 700, H02M 768

Patent

active

056125810

ABSTRACT:
A power supply apparatus with a back-up power unit includes: a plurality of AC-DC conversion units each connected in parallel to a commercial AC power source, and each converting an AC voltage of said power source to a high DC voltage; a plurality of DC-DC conversion units each connected to an output of each AC-DC conversion unit, each converting the high DC voltage to a low DC voltage to be supplied to a load, and each output thereof connected in parallel to said load; and a back-up power unit connected in parallel to the output of each AC-DC conversion unit through a first and second diodes in order to supply the high DC voltage to the DC-DC conversion unit when a failure occurs in the AC power source.

REFERENCES:
patent: 3818237 (1974-06-01), Straus
patent: 4675538 (1987-06-01), Epstein
patent: 4876460 (1989-10-01), Johnson
patent: 4894764 (1990-01-01), Meyer et al.
patent: 5532914 (1996-07-01), Kageyama et al.

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