使用平面非线性电感提高高频DC-DC变换器轻载效率  

Improving Light Load Efficiency of High Frequency DC-DC Converters With Planar Nonlinear Inductors

作　　者：王来利[1] 裴云庆[1] 秦洋[1] 杨旭[1] 王兆安[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2012年第2期10-17,32,共9页Transactions of China Electrotechnical Society

基　　金：国家科技部支撑计划项目(2007BAA12B01)

摘　　要：应用在便携式电子设备中的高频DC-DC变换器的轻载效率对于延长电池寿命是十分重要的。本文提出了使用电感值能在大范围内逐渐变化的非线性电感并采用自适应导通时间控制技术来提高DC-DC变换器的轻载效率。本文首先对恒定导通时间控制的传统变换器和基于非线性电感的自适应导通时间控制的变换器的损耗进行分析比较;其次,采用非常适于无源集成的低温共烧陶瓷(LTCC)技术制作的多磁导率磁心来设计并制作一个LTCC非线性电感样品;最后,将其应用于自适应导通时间控制的变换器评估其性能,其电感值在满载时为180nH,在空载时为1.02?H。Light load efficiency of high frequency DC-DC converters used in portable electronic devices is very important for extending lifetime of batteries.This paper proposes to use large-range gradually changed nonlinear inductors with adaptive on time control to improve the light load efficiency not only in disconfinuous conduction mode（DCM）,but also in continuous conduction mode（CCM）.Loss reduction is demonstrated by calculating loss of a conventional converter and a converter implemented with the proposed method.Multi-permeability magnetic cores based on LTCC technology are advanced to realize the nonlinear inductors.An analytic model is set up to show the design of inductor.A two permeability inductor prototype is fabricated and evaluated.Its inductance is 180nH at full load,1.02μH at no load.

关 键 词：轻载效率 非线性电感 DCM CCM LTCC 自适应导通时间控制 

分 类 号：TM46[电气工程—电器]