Alternating current ferroresonant transformer with low harmonic

Electricity: power supply or regulation systems – Self-regulating – Using a transformer or inductor as the final control device

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336165, 336170, 336178, 336215, G05F 306

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active

059125535

ABSTRACT:
An AC ferroresonant transformer includes a core having a closed loop path and a magnetic shunt assembly extending between portions of the core. A primary winding, a secondary winding and a tertiary winding are disposed on the core to link with magnetic flux in the core and the magnetic shunt. The tertiary winding includes terminals that are electrically isolated from the secondary winding. A first aspect of the present invention includes a tank capacitor connected to the tertiary terminals to form two LC circuits wherein a first LC circuit is a resonant circuit and a second LC circuit is a filtering circuit. Another aspect of the present invention is a method of operating an AC ferroresonant transformer proximate a knee of a B-H curve of the core, at minimal line voltage and full load, to reduce the generated harmonics.

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