研究目的
To propose an efficient LED lamp converter circuit with dimming feature and multiple lamp independent control, aiming for lower voltage stress on switching devices, reduced switching losses, and increased efficiency.
研究成果
The proposed LED driver configuration efficiently powers LED lamps with dimming capability and independent control, achieving high efficiency (up to 98.97%) and reduced voltage stress on switches. The use of soft switching and resonant power conversion minimizes losses, making it suitable for residential applications.
研究不足
The study focuses on a specific configuration with two LED lamps and may require adjustments for scaling to more lamps or different power requirements. The efficiency and performance are dependent on the quality of components like MOSFETs and inductors.
1：Experimental Design and Method Selection:
The study employs a half-bridge resonant converter in series with a DC source, operating at 200 kHz with soft switching for resonant power conversion. Dimming is achieved by modulating the low frequency pulse width.
2：Sample Selection and Data Sources:
A laboratory prototype was designed for two lamps operating in parallel with a total power of 25 W, suitable for residential applications.
3：List of Experimental Equipment and Materials:
Includes MOSFET IRF640N for switches, inductors L1 and L2 (570 μH), resonant inductor Lr (24.65 μH), resonant capacitor Cr (50 nF), and control ICs UC3875 and IR
4：65 μH), resonant capacitor Cr (50 nF), and control ICs UC3875 and IRExperimental Procedures and Operational Workflow:
2110.
4. Experimental Procedures and Operational Workflow: The converter's operation involves switching S1 and S2 alternately with a certain duty ratio, providing dead time to avoid short circuits. Dimming is controlled by switches S4 and S6 at 1 kHz.
5：Data Analysis Methods:
Efficiency analysis was conducted by measuring input and output power under various dimming levels, with results showing high efficiency across all levels.
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