Triggering circuit for a triac

摘要

A simple triggering circuit for a triac which is intended to be used as a switch for a resistive load in an AC power supply system, is provided as a first electronic switch to whose switching signal input - linked in an additive manner - the measurement signal output, the evaluation logic and the output of a circuit arrangement for converting the power supply voltage into rectangular pulses are applied. The output of the first electronic switch is connected in a switched manner via a second electronic switch (which is constructed as a changeover switch) and a differentiating element to the triggering electrode of the triac.