摘要
在开关电源中存储和传递直流功率,会在磁件铁心中产生较大的直流偏磁,限制了磁件铁心利用率和电源性能的提高。该文依据削减和消除直流偏磁的思想,提出一种用于两通道交错并联型Buck变换器的可削减直流偏磁的集成磁件结构,建立了集成磁件的等效磁路和电路模型,分析了集成磁件的交、直流磁通分布及其对变换器动态响应速度、稳态电流纹波和输出电流波形的影响,给出了集成磁件的设计公式,完成了采用这种集成磁件的两通道交错并联型Buck变换器原理样机设计,通过理论分析和实验证明该文提出的可削减直流偏磁的集成磁件结构与现有结构相比具有诸多优点。
There is a big DC-bias in the core of the magnetics storing and transfering DC power in switched power supply, which restricts the increase of the core’s utilization ratio and the improvement of the power supply’s performance. On the basis of the idea of reducing and eliminating DC-bias, this paper proposes an integrated magnetics structure whose DC-bias can be reduced and can be used in interleaving Buck converter. The integrated magnetics’ magnetic model and electric model are established; its DC-flux and AC-flux are presented and its effect to converter’s dynamic speed, stable current ripple and output current wave form are analyzed. Also its design formulas are given. Finally, the theorem prototype of interleaving Buck converter that adopts this integrated magnetics has been designed, and the advantages of the proposed integrated magnetics structure via existing ones are verified.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第11期50-54,共5页
Proceedings of the CSEE
基金
国家自然科学基金资助项目(50207004)。~~
