MULTI-LEVEL TRANSISTOR CONVERTER OF FREQUENCY FOR CONTROL OF AC ELECTRIC MOTOR Russian patent published in 2011 - IPC H02M7/527 H02M7/538 H02M7/53862 H02P27/08 

FIELD: electricity.

SUBSTANCE: in multilevel transistor converter of frequency, three-phase bridge rectifier on thyristors is arranged as controllable, current sensors and shaper of inverter transistors opening trajectory are introduced, and the shaper consists of several group of throttles, discharge resistors, dividing diodes and filter capacitors. Single-phase transistor inverter is arranged of serially joined transistors with original circuit of their connection.

EFFECT: limitation of currents of filter capacitor charging in case of initial connection of power voltage and performance of current protection function by unit of cubicle control without application of power fuses, reduced dynamic losses of capacity in case of connection and overvoltage values on transistors when they are disconnected, reduced quantity of cubicles and simplified design of power transformer.

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