【作者】 邹希；

【导师】 杜少武；

【作者基本信息】 合肥工业大学 ， 电工理论与新技术， 2006， 硕士

【摘要】 功率因数校正技术已经成为一项重要的研究课题,为了满足IEC 1000-3-2的谐波要求,实现低损耗和高效率,单级功率因数校正技术已经受到极大的关注,尤其在中小功率的应用场合对单级功率因数校正的需求日益迫切。在这篇论文里我们对单级功率因数变换器作了较完整的研究。 单级功率因数变换器由功率因数校正单元和直直变换器构成,共用一个开关管和控制单元,能够实现输入电流的整形和紧凑的电压调制输出。本文主要介绍一种较新颖的Flyboost变换器,由于Flyboost单元既包含boost电路的特点,又具备反激电路的某些特征,所以我们分别对boost电路和反激电路作了一定的分析,分析这些PFC电路的工作原理,借鉴到Flyboost电路上来,为我所用。 文中关注了直接功率传递的概念,因为Flyboost电路就是基于这种概念才被人们提出的,并详细分析了该电路的工作原理和拓扑结构的特性,简要介绍了boost电路的两端和三端的电流整形单元,很多新型功率因数校正电路都是由这两种电流整形单元的结构得来的。 实验表明这种Flyboost电路能获得高功率因数和较低的储能缓冲电容电压,而且直接能量传递单元提高了整体的效率。更多还原

【Abstract】 Power factor correction techniques have become one of the most important research topics. In order to compliance with IEC 1000-3-2 harmonic regulation and realize low-cost, high-performance, the single-stage power factor techniques have been given much attention these years. Especially in lower power application, single stage power factor correction converters become more and more urgent. In this dissertation the single-stage power factor correction converters are thoroughly studied.A single-stage PFC converter combines the PFC stage and a DC/DC converter into one stage with a shared switch and controller. They can implements the input current shape and provide tight output regulation. Because the flyboost PFC converter has the characters of boost type and the ones of flyback type PFC convert, we present a topological study of representative boost and flyback single-stage PFC converter and analyze the operation principle and characteristics of these single-stage PFC converters thoroughly. The single-stage PFC converters of Boost type can be classified as 2-terminal input current shaper (ICS) cell and 3-terminal ICS cell. Several new PFC topologies were derived from some existed ones using the translation rule of the 2-terminal and 3-terminal ICS cell.In this dissertation, we studied the concept of direct-power-transfer (DPT). The topology with flyboost cell which use the concept DPT is analyzed, the operation principle and characteristics of the topology is depicted in detail.From the experimental results we can see the flyboost PFC cell can achieve a high power factor and low voltage of the intermediate energy-storage capacitors. Moreover, The DPT cell give the system a higher efficiency.更多还原