谐振开关电容变换器中潜电路现象的研究

STUDY OF SNEAK CIRCUIT IN RESONANT SWITCHED CAPACITOR CONVERTERS

潜电路是潜伏在系统中的一种通路或状态,它在一定条件下出现并导致系统产生非预想到的特性。该文在降压式谐振开关电容变换器中发现潜电路现象,其特点是在控制策略完全不变的情况下,仅由电路扰动就会导致潜电路现象发生。文中从理论上分析了产生该潜电路现象的原因,证明了它是一种在过去研究中未曾观察到的新现象,推导得出了潜电路的发生条件及相应的变换器运行特性,并基于潜电路的回路特征,提出消除潜电路的相关措施,并将这一结果推广到其它类型的谐振开关电容变换器。实验结果证实了这一发现和理论分析结果。

Sneak circuit is a latent circuit path or condition that causes undesired function to occur at some certain conditions. The sneak circuit is discovered in the step-down resonant switched capacitor （RSC） converters for the first time. With the same control method, the sneak circuits in RSC converters will appear only by the converter disturbances. This paper derived the conditions that cause sneak circuits in step-down RSC converter and output characteristics with sneak circuits, then some methods are proposed to eliminate sneak circuits. The proposed sneak circuit analysis can be applied to other kinds of RSC converters. A step-down RSC prototype has been implemented. The sneak circuit phenomena and the method to eliminate them are verified by experiments.