THREE-PHASE AMPLIFIER Russian patent published in 1998 - IPC

FIELD: electrical engineering, applicable, for instance, for control of three-phase synchronous and induction motors with an insulated neutral. SUBSTANCE: three-phase amplifier uses single-phase amplifiers 2,3,4 fed from three-phase signal source 1, whose outputs are connected to three-phase load 11 star-connected without a neutral wire, units 5,6,7 producing the maximum, minimum and mean values of output signals respectively, adders 8,9,10. The outputs of three-phase signal source 1 are connected to the first inputs of adders 8,9,10 and to the inputs of units 5,6 producing the maximum and minimum values of output signals, whose outputs are connected to the first and second inputs of unit 7 producing the mean value of output signals, whose output is connected to the second inverting inputs of adders 8,9,10. EFFECT: expanded linearity range. 3 wdgg