Sensor device of the type having two terminals is fed with alternating current returns under a voltage that can vary within a wide range, with the control of the load by means of thyristors switching

摘要

A detector apparatus of the two-terminal type supplied with rectified A.C. power (e1, e2, v1 v2, D7-D10) the voltage of which can vary in a wide range, for controlling a series-connected load (CH), including at least one thyristor (TH1) and a Zener diode (Z3), a detector-control circuit assembly (CAP) associated with the load, the output (s) of which biases the base of a first transistor (T1), a capacitor (C5) serving as a power supply for the detector control circuit (CAP), and means for protection against overloads, which include a MOS-type transistor (T3), a second transistor (T2) connected to the grid of said MOS transistor, and a differential amplifier (A) connected in series with the base of said first transistor (T1).