ASYNCHRONOUS MOTOR UNIT COMPRISING A FREQUENCY CONVERTER WITH ELECTRICAL ISOLATION IN THE DC VOLTAGE INTERMEDIATE CIRCUIT

摘要

The converter has a direct current (DC) voltage intermediate circuit comprising a DC-to-DC converter (3) i.e. push-pull converter, with galvanic isolation for producing electrical isolation between an input-side, uncontrolled bridge rectifier (2) and output-side inverter (5). The galvanic isolation is formed by a radio frequency transformer, and a secondary winding of the transformer comprises a center tap. The DC-to-DC converter comprises a half bridge controller, and a brake chopper circuit (4) is arranged in the intermediate circuit.