AC-TO-DC CONVERTER Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: converter has transformer 11 and rectifier 1 built around valves 2-7 connected into three-phase bridge circuit. Extreme leads of winding 13 are connected, respectively, through choke coil 9 and capacitor 8 to first and second diagonally opposite pairs of a. c. terminals of rectifier 1 and common point of connection of two windings, through choke coil 10 to third diagonally opposite pair of terminals of rectifier 1. Parameters of hardware components can be selected in combination affording reduced reactive component in input current and reduced supply voltage fluctuations due to use of additional choke coil 10 inserted into third diagonally opposite pair of a.c. terminals of rectifier 1; increased inductance of current paths crossing capacitor 8 reduces content of higher harmonics in input current. EFFECT: improved waveform of input current curve. 4 cl, 5 dwg