FIELD: electricity.
SUBSTANCE: invention is related to electric engineering and may be used, for instance in frequency inverters for control of three-phase synchronous and asynchronous motors. Circuit of three-phase amplifier comprises three-phase source of signals, the first-third single-phase amplifiers, units for generation of maximum and minimum values, unit for generation of average value, the first-fourth summators, source of permanent signal, fourth amplifier.
EFFECT: improved efficiency - provision of possibility for amplification of unbalanced system of voltages in case of power supply from unidirectional source of DC voltage with preservation of expanded linearity zone.
4 dwg
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