3 Phase 208VAC to 400V DC Power Supplies Rectifier

To get 400Vdc from 3-phase 208Vac, you need a multi-stage rectifier that includes a system for voltage step-up and potentially isolation, followed by a three-phase bridge rectifier to convert the AC to pulsating DC, which is then smoothed by filter capacitors to produce the 400Vdc. For a more compact design with power factor correction (PFC) and isolation, a high-frequency transformer can be used with a PFC rectifier at the input.