Uninterruptible power supply having solid state transfer switch

Details Uninterruptible power supply having solid state transfer switch Uninterruptible power supply having solid state transfer switch

1998-01-07

1999-07-06

Paladini, Albert W.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 85, 307 87, 361 65, 361 67, H02J 709

Patent

active

059201290

ABSTRACT:
An uninterruptible power supply (UPS) for supplying DC power to a load and a method of providing uninterruptible DC power to a load. In one embodiment, the UPS includes: (1) a first stage rectifier that rectifies AC input power received from a primary power source into DC power at an intermediate voltage, (2) a second stage rectifier, coupled to the first stage rectifier, that converts the DC power at the intermediate voltage into DC power for the load at an output voltage that is lower than the intermediate voltage and (3) a solid state transfer switch, coupled between the first stage rectifier and the second stage rectifier, that transfers secondary input power received from a secondary power source to the second stage rectifier only when a voltage of the secondary input power exceeds the intermediate voltage.

REFERENCES:
patent: 3942028 (1976-03-01), Baker
patent: 4323788 (1982-04-01), Smith
patent: 4340823 (1982-07-01), Miyazawa
patent: 4761563 (1988-08-01), Ross et al.

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