Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1983-11-07
1986-01-14
Eisenzopf, Reinhard J.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 48, 307 87, H02J 906
Patent
active
045647674
ABSTRACT:
A power supply system for providing uninterruptible DC output power with momentary failure of the primary or AC mains supply utilizing a DC power source for back-up includes a power transformer having two primary windings, rectifying means, a serially-connected high voltage switching device coupling one primary winding to the AC primary mains supply, and a low voltage switching device coupling the second primary winding to the back-up DC supply. An output winding on the power transformer is coupled to a rectifying device for providing a DC output voltage. A transition circuit arrangement senses the DC output voltage and the resulting DC voltage generated by rectifying the AC mains supply and controls the duty cycle of the high voltage and low voltage switching devices by gradually increasing the duty cycle of the low voltage switching device to supply additional power when the AC mains voltage and resulting DC voltage decreases, thereby providing a virtually transient-free DC output voltage. The present circuit arrangement is capable of supplying continuous output power with severe or minor brown-out conditions of the AC mains supply.
REFERENCES:
patent: 3873846 (1975-03-01), Morio et al.
patent: 4475047 (1984-10-01), Ebert, Jr.
patent: 4488057 (1984-12-01), Clarke
Eisenzopf Reinhard J.
Jennings Derek S.
TII Industries Inc.
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