Modular interface and algorithm for driving multiphase power converters

Command systems for AC power converters (rectifiers, cycloconverters, AC variators) are realized in an analog digital or mixed form. Depending on their utilization. They are made on standard blocks with circuits of general use or specialized ones. The basic element that offers specificity to these command circuits is the necessary synchronism between the power converter and the main command system. The function realized by the command system with phase control is the conversion from command input (variable phase) to firing angle α. The digital command can be achieved on the base of some finite automata structures or microprocessor programmable ones. Nowadays, the microcomputer is ever more present in the command system and can substitute a range of functional blocks to a large extent. The microcomputer can deal with both necessary elements in order to generate the command, in consistency with an imposed algorithm and problems related to the supervising and protection of the power converter. To create the possibility to generate the command in real time, the command module (software) is integrated in assembly language within the frame of the main program written in a high level language (Pascal C, etc.). In the context a minimal hardware structure is necessary, the hardware allowing the interfacing between the microcomputer and the power converter