THREE-PHASE-TO-THREE-PHASE FREQUENCY CONVERTER Russian patent published in 1994 - IPC

FIELD: conversion equipment. SUBSTANCE: circuit of frequency converter is supplemented with two reservoir capacitors or each phase. These capacitors are connected to phase voltages of three-phase network with the help of controlled keys of two-way conductance in turn so that one of them is recharged from network up to definite voltage determined by time of open state of corresponding key at the moment when the other capacitor discharges to load of converter forming curve of output voltage. In this case recharged capacitor is isolated from load by means of shut keys and capacitor discharging to load is isolated from network with the use of analogous keys. Changing time of recharge of reservoir capacitor from network one can adjust value of output voltage of converter preserving shape of curve independent of value of output voltage. EFFECT: preservation of shape of curve of output voltage independent of its value. 3 dwg