This paper describes the modulation, design, and realization of a buck–boost-type, unity-power-factor, isolated matrix-type, dual-active-bridge, three-phase rectifier. In many applications, isolation is required between the mains and the load, for example, due to safety reasons or different grounding schemes. An input power factor of 0.999, an input current total harmonic distortion of as low as 4.06%, and a high conversion efficiency of 95.1% are achieved from laboratory prototype.read more read lessĪbstract: Three-phase power factor correction rectifiers are an essential area of power electronics, supplying a direct current load with tens of kilowatts, or more, from the public three-phase mains and achieving sinusoidal input currents. The experimental results from a 2-kW laboratory prototype with 208-V line-to-line input voltage, 400-V output voltage are presented to confirm the operation of the proposed converter. And also a small-signal model of the converter by using current injected equivalent circuit approach is presented to aid the controller design. The detailed operation of the converter and design calculations are presented. The converter requires only one simple voltage control loop for output voltage regulation, and all the power switches are driven by the same gate signal which simplifies the gate driver circuit. This makes the system more reliable and robust. This avoids the inner current control loop which further eliminates the sensing of current. The proposed converter is operated in discontinuous output inductor current mode to achieve PFC at ac input. Abstract: In this paper, analysis and design of a three-phase-isolated Cuk-based power factor correction (PFC) converter have been proposed.
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