THREE-PHASE INVERTER WITH DC-LINK AND METHOD OF ITS CONTROL Russian patent published in 2015 - IPC H02M7/00 H02M7/5387 

FIELD: electricity.

SUBSTANCE: common output lead of auxiliary keys is connected to the midpoint formed by two filter capacitors of direct current, at that power modules based on integrated transistors (IGBT) are used as the auxiliary keys and control inputs of these modules are connected to outputs of control pulse decoders of the auxiliary keys while inputs are connected to outputs of the respective decoders of the auxiliary keys; between the common output of the auxiliary keys and the midpoint of the filter capacitors an additional capacitor may be coupled; duration of a switched on state of the auxiliary keys for the respective inverter phases at cosφH=0.98 and less is set as 0.06T, and at cosφH=0.98-1.0 it is set as 0.052T.

EFFECT: reducing distortion the factor by 1,8 times at change in cosφH from 1,0 up to 0,6 within the whole range of the load change at frequencies of 400 and 200 Hz.

3 cl, 2 dwg