研究目的
To introduce a novel single-phase multilevel boost-based PFC rectifier that allows further reduction of the inductor volume while maintaining the benefits of the previously presented multilevel solutions.
研究成果
The NSMB-based PFC rectifier demonstrates significant improvements over conventional boost-based solutions, including a three times smaller inductor, reduced switching losses, and up to 6% better power processing efficiency. The novel topology and digital controller provide stable operation and seamless mode transitions, making it suitable for applications requiring between 100 and 500 W of power.
研究不足
The NSMB requires a larger number of components, high-side gate drivers, more complex control, and a nonconventional downstream stage compared to conventional boost solutions. The design tradeoff involves increased semiconductor part numbers for reduced inductor volume and improved efficiency.
1：Experimental Design and Method Selection:
The NSMB converter was designed to operate with a nonsymmetric active capacitive divider with a 3:1 conversion ratio, replacing the output capacitor of the boost converter. The digital controller dynamically changes modes of operation based on the instantaneous input voltage value.
2：Sample Selection and Data Sources:
A 400 W, 200 kHz, universal input voltage (85 Vrms –265 Vrms) PFC prototype was built for experimental validation.
3：List of Experimental Equipment and Materials:
The prototype included a modified three-level boost converter topology, a nonsymmetric active capacitive divider, and a digital controller implemented with an FPGA-based development board.
4：Experimental Procedures and Operational Workflow:
The converter's performance was compared to conventional boost and three-level boost converters under the same conditions to validate the advantages of the NSMB converter.
5：Data Analysis Methods:
Efficiency, inductor current ripple, and power factor were measured and compared to assess the performance improvements.
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