MULTIPHASE CONVERTING CIRCUIT WITH LOW CONTENT OF HIGHER HARMONICS Russian patent published in 2009 - IPC H02M5/458 

FIELD: physics.

SUBSTANCE: multiphase converting circuit p≥3 phases (R, S, T) is proposed incorporating a converting subcircuit (1) intended for every aforesaid phase. Every said subcircuit (1) comprises rectifier (2), constant voltage circuit (3) connected to rectifying unit (2) and inverter unit (4) connected to aforesaid circuit (3). The first variable-voltage output (5) of everyone inverter unit (4) forms a phase output (6), while the second variable-voltage outputs (12) of units (4) are star-connected. In compliance with this invention, n transformers (7) are arranged comprising one primary (8) and m three-phase secondary windings (9). Note here that, n≥2, and m≥3. Note also that p sets (10) of secondary windings are also provided for, each set being formed by m/p three-phase secondary windings (9) of every transformer (7). Every set (10) of secondaries (9) is connected to rectifier (2) of one converting subcircuit (1).

EFFECT: least number of higher harmonics relative to fluctuation of basic voltage and current harmonic connected to AC mains converting circuit input.

15 cl, 10 dwg