New detecting means with lead characteristics in carrier-type control system

In a carrier-type control system, necessary operation usually is conducted after demodulating a modulated actuating signal once to a dc signal. This demodulation undesirably retards a signal. Using a general principle, the value of a modulated signal can be determined during a half-cycle of a carrier wave. A reactor with a rectangular magnetization loop can easily integrate a voltage, add or subtract a flux change and a voltage integral, and store this information. In this paper, a circuit is described employing saturable reactors; an error can be measured during a half-cycle, and a large output corresponding to the (proportional plus derivative) value of an error can be obtained.