CURRENT INVERTER Russian patent published in 2008 - IPC H02M7/521 H02H7/122 

FIELD: transformation equipment, namely current inverters, possible use in asynchronous electric motor.

SUBSTANCE: autonomous current invert contains three-phased thyristor bridge with serially connected thyristors and intercepting diodes, commutating capacitors, saturation throttles, linear throttle, controllable supply of constant voltage, three-phased load circuit, system for controlling three-phased thyristor bridge. Saturation throttles are provided with secondary reducing windings, which are connected respectively to voltage transformers, outputs of which are connected to inputs of control system. Each voltage transformer is connected to resistor-based voltage divider, input of which is the input of voltage transformer, and output is bridged with bipolar stabilitron and connected to galvanic decoupling circuit, output of which is the output of voltage transformer. Thyristor state control makes it possible to organize fast action protection of current inverter prior to appearance of impact currents through thyristors.

EFFECT: realization of control over condition of thyristors, possible increase in speed of inverter protection action.

2 dwg