Power factor corrected UPS with improved connection of battery t

Details Power factor corrected UPS with improved connection of battery t Power factor corrected UPS with improved connection of battery t

1993-03-29

2000-05-30

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

363 44, H02J 700

Patent

active

060694122

ABSTRACT:
An uninterrupted power supply (UPS) device with uninterrupted neutral from input to output utilizes the same converter for converting rectified AC power and battery power to positive and negative high voltage (HV) rails. A simple circuit is utilized for connecting the battery to the conversion components of the PFC circuit without adverse affect on the performance of the PFC circuit, and while holding the battery substantially connected to neutral. In a first embodiment, the circuit comprises a simple combination of four diodes and a pair of high pass capacitors arranged so that in both power line and battery supply modes the battery is balanced around neutral. In a second, preferred embodiment, one terminal of the battery is connected directly to neutral.

REFERENCES:
patent: 4729081 (1988-03-01), Nilssen
patent: 4823247 (1989-04-01), Tamoto
patent: 4935861 (1990-06-01), Johnson, Jr. et al.
patent: 4980812 (1990-12-01), Johnson, Jr. et al.

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