FIELD: electrical engineering. SUBSTANCE: device has master oscillator, pulse-width modulator, pulse- operated voltage regulator, three-phase power amplifier, three-phase pulse train shaper, sine- wave voltage shaper, as well as NOR gate, and frequency divider whose input is connected to frequency doubler output. First input of NOR gate is coupled through inverter with master oscillator and its second input, with pulse- width modulator output. Reset input of the latter is connected to frequency doubler output and its control input, to sine-wave voltage shaper output. Frequency divider output is connected to three-phase pulse train shaper input. NOR gate output is coupled with control input of pulse-operated voltage regulator. EFFECT: improved noise immunity of device. 3 cl, 3 dwg
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