THREE-PHASE INVERTER WITH DC SECTION Russian patent published in 1999 - IPC

FIELD: conversion engineering; power supplies for three-phase motors. SUBSTANCE: inverter has main switches connected into bridge circuit and auxiliary switches; it is built around fully controlled switches and has diodes connected in parallel opposition through main switches, auxiliary switches connected in pairs in parallel opposition with one terminal to respective phase lead of load and with other one, to negative terminal of DC power supply built around thyristors and capacitor through capacitor. Main switches are conductive during 5/12T and auxiliary ones, during 1/12T at moment of phase voltage reversal. EFFECT: improved characteristics of output voltage. 2 dwg, 1 tbl