THREE-PHASE FREQUENCY CONVERTER Russian patent published in 2010 - IPC H02M5/16 H02P27/00 

FIELD: electricity.

SUBSTANCE: circuit of three-phase frequency converter comprises source of u_a, u_b, u_c setting signals (1), the first group of summators (2-4), the second group of summators (5-1), the first-third amplifiers (8-10) generator of correction signal (11) generator of linearly varying signal (12) the first-third comparators (13-15) the first-third inverters (16-18) driver (19) unit of power switches (20), unit of three-phase load (21), unit of voltage sensors (22). Due to arrangement of correction signal generator (11) with the possibility to implement function with limitation of values u_a+u_k, u_b+u_k, u_c+u_k within the limits of linearly varying signal, three-phase frequency converter may operate with optimal power parameters, i.e. with reduction of losses capacity in load due to pulse-width modulation at balanced system of master voltages and preservation of maximum linear zone of output voltage without complication of three-phase frequency converter.

EFFECT: minimised capacity of losses in three-phase load connected to pulse-width modulation with preservation of maximum linear zone of output voltage.

5 dwg