Common mode conductive noise cancellation for multiphase converter using auxiliary winding

A multiphase DC-DC converter consisting of a coupled inductor and fast switching devices enables power electronics equipment to achieve a high-power density. However, with such devices, the fast voltage transition generates substantial common mode (CM) noise. However, there are very few studies on CM noise reduction for multiphase converters using a coupled inductor. Therefore, in this paper, a CM noise reduction method is proposed for a multiphase DC-DC converter that hardly lowers the power density.     

Analysis,design, and minimum phase selection of high power interleaved DC–DC converter

The primary use of interleaved bidirectional DC–DC converters (IBC) is for high current applications due to the inherent property of ripple cancellation, high redundancy, and improved efficiency. Proper analysis and design are required to improve the power density and reduce the cost of the $N$-phase IBC. Ripple current analysis plays a vital role in choosing the inductor and filter capacitors to minimize the size of an IBC. This paper presents the simple and generalized formulas for the current ripple minimization of $N$-phase IBC. Also, the inductor is designed with two different core materials, namely, Ferrite and Sendust. It is observed that the area product and weight of the magnetics have been reduced by 22% and 23%, respectively, for Sendust core in comparison with the Ferrite core. Furthermore, a discussion regarding the thermal analysis of IGBT modules to select an appropriate heat sink is stated. Moreover, the minimum phase selection has been proposed by considering several constraints such as area product of the core, discrete components size based on ripple analysis, cost of all components, and converter efficiency. The prototype of the selected minimum phase IBC has been developed and tested for a 7.5 kW power level using TMS320F28335.     

基于耦合电感型双层Cuk斩波电路的电池均衡系统

电池在串联成组使用时,由于制造工艺、工作环境不同等因素,电池之间荷电状态(SOC)和电压存在不一致的问题。为解决该问题提出了一种基于耦合电感型双层Cuk斩波电路电池均衡系统,用耦合电感代替非耦合电感,比传统Cuk斩波电路减少了元器件数量,降低了损耗,提高了均衡效率。同时,该均衡系统使用N沟道MOSFET,由同步触发脉冲PWM中一对互补信号控制。通过电路理论分析,设计了完整的均衡电路,最后在MATLAB/Simulink中进行仿真,结果验证了该均衡系统的高效性。     

基于聚合理论的大区电网负荷建模

提出了负荷模型向量基的概念,把基于元件的建模方法(综合统计法)和基于量测的建模方法(总体测辨法)结合起来,以聚合理论为基础,把实测点的负荷模型外推到其他未知点。通过负荷调查统计建立负荷模型系数矩阵,由实测点的负荷模型,通过不相容方程求最小二乘解,得到该地区的负荷模型向量基,区域内的其他任意未知点的负荷模型均可通过负荷模型向量基求出,建立该地区的负荷模型参数库。该方法已应用于实际电网,取得了良好的效果。