Uninterruptible power supply with dual level voltage input

Details Uninterruptible power supply with dual level voltage input Uninterruptible power supply with dual level voltage input

1990-05-09

1991-04-23

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 17, 363 98, 363132, 307 46, 307 66, 307 87, H02M 3335

Patent

active

050104691

ABSTRACT:
An uninterruptible power supply is disclosed having an inverter that operates on either high voltage d.c. supplied by a line-powered power supply or on low voltage d.c. batteries. With line power, the inverter operates as an H-bridge inverter. With battery power, the battery voltage is applied to a smaller portion of the inverter's transformer primary. The changeover from line to battery power is determined by when an intermediate voltage tapped from the transformer drops below the battery voltage.

REFERENCES:
patent: 4926084 (1990-05-01), Furutsu et al.
patent: 4952834 (1990-08-01), Okada
patent: 4954741 (1990-09-01), Furutsu et al.

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