An Analysis of a Single Core Balanced Output Magnetic Amplifier (Darling's Circuit)

Abstract

About the single core magnetic amplifier recently proposed by Darling, an equivalent circuit transformation and a piece-wise linear analysis are made, and the detailed behavior of the circuit is made clear for the first time.
As a result of the analysis, it is successful to express the amplifier gain in the simple equations. It is also found that the forward voltage drop of the diodes plays an important role in order to increase the amplifier gain, and it is clarified that there exists the optimum value of the diode forward drop, which determins the maximum gain of the circuit.