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

H - Electricity

02

J

323/5

H02J 9/06 (2006.01) H02M 1/10 (2006.01) H02M 7/5387 (2006.01)

Patent

CA 2036296

ABSTRACT OF THE DISCLOSURE 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 ?- 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.

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