FREQUENCY CONVERTER CONTROL PROCESS Russian patent published in 2000 - IPC

FIELD: converter engineering; ozonizer control. SUBSTANCE: controlling frequency converter that has rectifier and push-pull inverter built around fully controlled reverse- shunted diodes and connected to rectifier output leads through filter choke coil operating into inductive load involves generation of control pulses and their alternate supply to diodes that shape forward and reverse current half- waves across load. In the process, rectangular pulses are generated their cycle being 0.5T, where T is cycle of ac output current; turn-on moments of diodes depend on leading edges of mentioned pulses; current level is set, instant current value is measured across diagonally opposite terminals of inverter and compared with desired current level, moments when current measured across diagonally opposite terminals of inverter are equal to desired current level is determined, and at this moment diodes are turned off. EFFECT: improved operating reliability of frequency converter. 2 dwg