Abstract:
This project analyzes and designs a three-phase-isolated Cuk-based PFC converter. To achieve PFC at ac input, the converter uses discontinuous output inductor current mode. The inner current control loop is avoided, eliminating current sensing. It strengthens the system. One simple voltage control loop regulates output voltage, and all power switches are driven by the same gate signal, simplifying the gate driver circuit. Design calculations and converter operation are shown. A small-signal converter model using current-injected equivalent circuit approach aids controller design. The proposed converter is tested using a 2-kW laboratory prototype with 208-V line-to-line input voltage and 400-V output voltage. Laboratory prototypes achieve 0.999 input power factor, 4.06% input current total harmonic distortion, and 95.1% conversion efficiency.
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