Fast-response magnetic amplifiers

A MAGNETIC AMPLIFIER having a characteristic of “single-cycle” response was introduced by Ramey in which the load and control circuits are not mutually coupled in the usual sense. Instead, they operate on the magnetic state of the core on a time-sharing basis. With a rectangular flux-current loop core material, ideal rectifiers, sine-wave voltage sources, RcT = 0, and with the input signal to the amplifier of Fig. 1 a half-wave rectified sine wave, the gain in terms of average input and output voltages is just the turns ratio. Thus, by decreasing the control turns, the gain is increased. The inclusion of RcT in the circuit results in a constant voltage drop ImRcT during reset and hence a decreased resetting action. Further, since the magnetizing current which causes this drop increases as the control turns are reduced, there is an optimum number of control turns.