FIELD: conversion equipment. SUBSTANCE: for increase of quality of output voltage of inverter by improvement of its spectral composition during formation of unipolar-bipolar pulse-duration modulation transfer from unipolar to bipolar mode is carried out by control over instantaneous value of modulating voltage. In this case transfer from unipolar to bipolar mode is conducted with value of modulating voltage equal to 0.2-0.5 of its maximum magnitude. EFFECT: increased quality of output voltage. 2 cl, 1 dwg
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