一种无源无损钳位的新型单级PFC变换器

提出了一种新型反激式单级PFC变换器结构,它采用"直接能量传输(DPT)"来提高变换效率、抑制电容电压,并通过引入无源无损钳位的LCD电路来吸收利用漏感能量、钳位开关电压,进而从整体上提高变换器的性能。实验结果显示,它在保持中间储能电容电压Vd小于300 V,开关电压应力VS1低于450 V的情况下吸收利用漏感能量,使变换效率η提高约1.4%。证明了这种结构在解决单级PFC变换器当前所遇问题上的有效性。

微小卫星能源系统研究

微小卫星目前应用广泛,其体积小、质量轻、成本低、应用最新技术等特点使其具有广阔的发展空间。能源系统是卫星的几大核心系统之一,提出了微小卫星能源系统设计方案并进行比较,分析了能源系统设计的关键要素,并且对国内外能源系统组成单机的最新应用技术进行了阐述,为开展新一代微小卫星能源系统研究提供参考。

Directed Transport of Interacting Particle Systems： Recent Progress

Recent developments in studies of directed transport processes in interacting particle systems are retrospected. Due to the interactions among elements, the directed transport process exhibits complicated and novel cooperative dynamics. We considered various possibilities in achieving ratchet motion by breaking different symmetries of many-body systems. It is shown that the directional transport can even be induced by breaking the coupling symmetry and the spatiotemporal symmetries.