A 12-Puls Rectifier With an Auxiliary Circuit

One of the problems of the most diode rectifiers is that they include large harmonic contents in its input current. A 12-pulse diode rectifier with an auxiliary voltage circuit is proposed. The purpose is to obtain a 12-pulse diode rectifier whose harmonic contents are reduced a lot. The auxiliary voltage circuit consists of two single-phase voltage converters which can be controlled conveniently. The auxiliary voltage reaches to the main circuit through transformer to improve the wave form of the input current. The reduction in the harmonic contents in the input currents is verified by a 6kW experimental results. Input current ηTHD is only 3.8%for full load conditions.