High efficiency, no dropout uninterruptable power supply

Details High efficiency, no dropout uninterruptable power supply High efficiency, no dropout uninterruptable power supply

1995-08-23

1997-06-03

Wong, Peter S.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

363 65, 363 71, H02J 900

Patent

active

056357737

ABSTRACT:
According to the present invention, a high efficiency no-dropout uninterruptible power supply is presented which will provide desired UPS characteristics while reducing or eliminating undesirable characteristics. In particular, simultaneous improvements are achieved in the areas of switchover transfer response time, droop and transients, EMI generation, power efficiency and heat generation, size, weight, ease of waveshaping, and powerline frequency sensitivity. The invention utilizes dual concurrent feedback loops to control utility-backup power transfer and incorporates a novel method of synchronized AC output generation which allows zero-power switching and simple high-frequency waveshaping control.

REFERENCES:
patent: 4277692 (1981-07-01), Small
patent: 4400625 (1983-08-01), Hussey
patent: 5315533 (1994-05-01), Stich et al.

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