METHOD AND SWITCHING ARRANGEMENT FOR THE FEEDBACK OF COMMUTATION ENERGY OF THREE-PHASE CURRENT MOTOR DRIVE SYSTEMS WITH A DC-LINK CURRENT INVERTER

摘要

There is disclosed a method and a circuit arrangement for the feedback of commutation energy in three-phase current drive systems with a current intermediate circuit converter. Commutation energy is released at each commutation in the inverter. The commutation unit ensures that the released energy is directly fed back to the current intermediate circuit in two steps. In the first step, the commutation energy is fed into the commutation capacitor by a rectifier circuit (diode bridge and three triacs). In the second step, the commutation energy is fed directly from the commutation capacitor into the current intermediate circuit by means of three semiconductors (first RIGBT, second RIGBT, diode) so that the current of the intermediate circuit flows through the capacitor over a controlled period of time.