FIELD: DC-to-AC industrial-frequency inverters. SUBSTANCE: device is universal module capable of operating both in off-line mode and with external ac control signal of desired frequency. Device has master oscillator, normalized-length delay shaper, pulse distributor, multiplexor, first and second phase-shifting units, switching unit, first, second, and third pulse shapers, inverter, decoder, comparison circuit, and normalized pulse number delay shaper. EFFECT: provision for eliminating inverter transformer and load saturation due to gradual transfer in each half-cycle from shorter to longer duration up to rated half-cycle length, that is, up to rated ac voltage frequency; provision for operating into inductive load. 3 dwg
