SWITCHING PROCEDURE AND DEVICE FOR THE FEEDBACK OF SWITCHING ENERGY IN DRIVE SYSTEMS THROUGH THREE-PHASE CURRENT MOTORS WITH CURRENT INTERMEDIATE CIRCUIT CONVERTER.

摘要

Procedure for feedback of switching energy in three-phase current drive systems with intermediate current circuit converter, whose converter comprises a current source (1), an inverter (2) and a switching unit (3), characterized by the following two stages: - in a first stage, during a first switching of the inverter, the switching energy created is stored, in a switching capacitor (3), suitably by means of a rectifier circuit (7, 8, 9, 10) partially or completely constituted based on controllable semiconductors and connected to the three outputs of the motor side rectifier, and - in a second stage, after the termination of the first switching of the inverter and before the start of the next switching of the inverter, the switching energy is fed directly from the switching capacitor (3) to the intermediate current circuit by means of d e two controllable semiconductors (4, 5, 14) and a diode (6) connected in series in the intermediate current circuit, so that the intermediate circuit current only passes through the switching capacitor (3) for a controlled time .