研究目的
To design and implement a power factor corrected (PFC) flyback converter operating in critical conduction mode (CrCM) for high-power LED lighting applications, achieving improved power quality and high efficiency over a wide range of input and output conditions.
研究成果
The CrCM flyback converter achieves improved efficiency (up to 92%) and power quality (PF > 0.99, THDi < 6%) across universal AC mains. It offers stable operation and flicker-free light output, making it suitable for high-power LED lighting applications. The use of an external VCC supply enables wide output operation, enhancing the converter's versatility.
研究不足
The converter's efficiency decreases slightly at lower AC mains voltages due to increased conduction losses in primary side components. The design requires careful consideration of component stresses and thermal management for high-power applications.
1：Experimental Design and Method Selection:
The flyback converter is designed to operate in CrCM for improved power quality and efficiency. State-space analysis is used for closed-loop stability under varying conditions.
2：Sample Selection and Data Sources:
The converter is tested with universal AC mains voltage of 85 to 265 V and a 100 W LED load.
3：List of Experimental Equipment and Materials:
Includes a flyback transformer, MOSFET S1 (TK10A60D), diode D1 (DURF1030CT), DC-link capacitor, and a second-stage LC filter.
4：Experimental Procedures and Operational Workflow:
The converter's performance is evaluated in terms of power factor, total harmonic distortion, and efficiency across the universal AC mains range. Output voltage ripple reduction is achieved with a second-stage LC filter.
5：Data Analysis Methods:
Power quality parameters are measured, and stability is analyzed using Bode plots derived from state-space analysis.
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