A new high power factor three-phase diode rectifier

This paper proposes a new high power factor three-phase diode rectifier. The new circuit is composed of a three-phase line interphase transformer (LIT), two three-phase diode rectifiers, followed by a PWM boost cell. The active switch of the boost power converter is gated at a constant frequency such that the AC input current is discontinuous. This procedure provides an input current shaping without the 3rd, 5th and 7th harmonics. The current that flows through the LIT and the input transformer has a switching frequency such that ferrite cores with small size are utilized. Besides this, the output voltage is regulated by PWM, to compensate for line voltage variations and load changes. The output voltage has a low practical level. Theoretical analysis, design procedure, design example and experimental results are presented.