The controlled ferroresonant transformer

An analysis of ferroresonant transformers is given, considering special structures which permit closed-loop regulation. An analytical fit is used for the magnetization curve of the material, and the fundamental frequency components of currents and voltages are obtained. Results are converted in an equivalent circuit. The controlled saturable admittance is expressed in terms of design parameters, material properties, and driving signal. Gains and sensitivities over the range of operation are derived.