图腾柱无桥PFC变流器研究

发布时间：2018-03-01 05:21

本文关键词： 通信电源图腾柱拓扑无桥 PFC　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着移动通信技术的发展,通信电源也得到越来越广泛的应用,传统通信电源一般由PFC级和DC/DC级组成,其中PFC电路的传统方案是平均电流控制的CCM模式Boost PFC电路,这种方案已经十分成熟,效率等性能也达到了极限。为了进一步提升PFC电路的效率,近年来越来越多的研究热点集中于无桥PFC电路,通过去除整流桥来减小导通损耗从而提升PFC电路效率。本文首先对现有的比较有代表性的各种无桥PFC拓扑进行对比和分析,包括他们的共模噪声、驱动实现难度以及元器件数量等,在此基础上对其中比较有应用前景的图腾柱无桥PFC拓扑进行深入的研究。图腾柱无桥PFC拓扑具有共模噪声低、元器件少的优点,然而,由于电路使用MOSFET的体二极管作为续流管,所以只能工作在DCM或者CRM模式下,为了使得图腾柱无桥PFC拓扑能够应用到实际产品中,本文对工作于CRM模式的图腾柱无桥PFC电路进行了研究,包括其数字控制方案、电流过零点检测方法、交错并联方法、体二极管反向恢复补偿、驱动方法以及轻载限频等问题,最后通过实验样机验证了各方案的可行性。
[Abstract]:With the development of mobile communication technology, the communication power supply is more and more widely used. The traditional communication power supply is generally composed of PFC and DC/DC. The traditional scheme of PFC circuit is CCM mode Boost PFC circuit controlled by average current. In order to further improve the efficiency of PFC circuits, more and more research focuses on bridge free PFC circuits in recent years. The efficiency of PFC circuits can be improved by removing rectifier bridge to reduce the loss of conduction. In this paper, we compare and analyze the existing representative PFC topologies without bridge, including their common-mode noise. On the basis of the difficulty of driving and the number of components and so on, the PFC topology of totem column without bridge, which has more application prospect, is studied in depth. The PFC topology of totem column without bridge has the advantages of low common-mode noise and less components, however, there are many advantages, such as low common-mode noise, less components and so on. Since the circuit uses MOSFET's body diode as a reflow tube, it can only work in DCM or CRM mode, so that the totem column bridge-free PFC topology can be applied to actual products. In this paper, the totem column without bridge PFC circuit working in CRM mode is studied, including its digital control scheme, current over 00:00 detection method, staggered parallel connection method, body diode reverse recovery compensation, driving method and light load frequency limiting, etc. Finally, the feasibility of each scheme is verified by the experimental prototype.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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