BUCK BOOST TRANSFORMER

A buck-boost transformer is a type of transformer which is primarily used to adjust the voltage level applied to various electric equipment. Buck-boost transformers are utilized in in several applications such as uninterruptible power supplies (UPS) units for computers.

When an existing AC electrical circuit suffers from excessive voltage drop along the length of the conductors, a conventional transformer, given the correct primary and secondary voltage ratings, can be wired as an autotransformer to boost the sagging voltage. The polarities of the two series-connected windings would have to be configured in additive polarity to add the lower secondary winding voltage to the primary-winding / line voltage.

When the AC distribution voltage within a building or other structure is of higher voltage rating than the voltage rating of a unit of electrical utilization equipment, a conventional transformer, given the correct primary and secondary voltage ratings, can be wired as an autotransformer to buck the too-high system voltage. The polarities of the two series-connected windings would have to be configured in subtractive polarity to subtract the lower secondary winding voltage from the primary winding/line voltage.