Abstract
Phase angle control is a well established technique which is used in many applications involving fixed as well as variable voltage and frequency. In some applications the voltage is distorted. This leads to the need for a general purpose firing circuit which meets all of these requirements. This paper describes a simple and reliable three phase firing circuit that can be used in any phase angle application. This circuit can operate on a distorted and variable frequency supply. The firing angle of the three phases is linearly controlled by a single internal or external DC voltage which enables the circuit to be controlled by a microcomputer system. Another advantage of this circuit is the possibility of firing both thyristors and triacs.
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