Interleaved three-phase boost rectifiers operated in the discontinuous conduction mode: Analysis, design considerations and experimentation

Interleaved discontinuous conduction mode (DCM) three-phase boost rectifier s provide current ripple cancellation and increase the effective frequency of the input current ripple. As a result, the size and cost of the differen tial mode (DM) input filter is reduced. This work presents a detailed analy sis of the input current ripple of interleaved three-phase DCM boost rectif iers. The design curves derived from the analysis are used to determine the DM input filter parameters. The experimental results are shown for two int erleaved three-phase DCM boost rectifiers rated at 8 kW of total power and operated at 40 kHz with IGBTs as the main power switches. The results show that the interleaved rectifiers comply with the IEC 61000-3-2 Class A harmo nic standard for this power level.