普适电压范围的单相PFC变换器研究及其优化设计

发布时间：2018-01-05 02:11

本文关键词：普适电压范围的单相PFC变换器研究及其优化设计　出处：《浙江大学》2017年硕士论文　论文类型：学位论文

【摘要】：功率因数校正(PFC)变换器广泛的应用在各种电力电子设备中,通过PFC变换器来改善电能品质,增强设备可靠性,是解决电力电子装置对电网造成电流谐波污染的重要手段。本文以传统Boost PFC变换器为例,详细介绍了 PFC电路的工作原理,效率损耗分布,以及其传导EMI的相关特性,并设计了实用的功率因数校正电源。首先,本文根据现有的文献资料,分析了现有的PFC电路的结构、特点以及控制方法,基于成本等综合考虑选用了 BoostPFC电路。在其基础上,对桥式BoostPFC电路的关键参数设计方法进行了分析,并给出了设计结果;针对PFC的电感,给出了详细的设计过程。对PFC电路进行了详细的损耗分析,建立了主要元件的损耗模型,并通过实验验证了模型的准确性。给出了两种提高PFC电路效率的方法,并搭建了实验电路验证了分析的有效性。其次,本文叙述了电磁兼容的相关概念,分析了 BoostPFC变换器传导EMI的特性。本文将Boost PFC电路中MOSFET开关管在开断时的漏源电压,看作差模干扰和共模干扰的干扰源,分析了差模干扰和共模干扰的传播路径。分析了在BoostPFC变换器的整流桥前后分别增加差模电容对混合干扰的抑制作用,并给出了差模干扰和共模干扰的等效电路,推导出了差模和共模的电压传输增益。对比了单级和两级滤波器的结构和相关特性,并给出了 BoostPFC电路的滤波器设计方法。最后,本文分析了PFC电路散热设计的必要性,给出了样机散热设计分析和结构,并制作了样机。在115V输入下,整机效率可以达到94%,电流谐波满足相关标准。实验结果验证样机具有高可靠性、高功率因数以及高效率等优良性能,说明了本文中设计的有效性。
[Abstract]:Power Factor Correction (PFC) converters are widely used in various power electronic devices. PFC converters are used to improve power quality and enhance equipment reliability. This paper takes the traditional Boost PFC converter as an example, introduces the working principle and efficiency loss distribution of the PFC circuit in detail. And the related characteristics of its conduction EMI, and designed a practical power factor correction power supply. Firstly, according to the existing literature, this paper analyzes the structure, characteristics and control methods of the existing PFC circuit. The BoostPFC circuit is selected based on cost and so on. On the basis of it, the design method of key parameters of bridge BoostPFC circuit is analyzed, and the design results are given. For the inductance of PFC, the detailed design process is given. The loss model of the main components is established by analyzing the loss of the PFC circuit in detail. The veracity of the model is verified by experiments. Two methods to improve the efficiency of PFC circuits are given, and the experimental circuits are built to verify the effectiveness of the analysis. Secondly, the related concepts of electromagnetic compatibility are described in this paper. The characteristics of BoostPFC converter conducting EMI are analyzed. In this paper, the leakage voltage of the MOSFET switch on the BoostPFC circuit is analyzed. It is regarded as an interference source of differential mode interference and common mode interference. The propagation paths of differential mode interference (DMI) and common-mode interference (CMI) are analyzed, and the suppression of mixed interference by increasing the differential mode capacitance (DMI) before and after the rectifier bridge of BoostPFC converter is analyzed. The equivalent circuit of differential mode interference and common mode interference is given, and the voltage transmission gain of differential mode and common mode is deduced. The structure and correlation characteristics of single and two stage filters are compared. The filter design method of BoostPFC circuit is given. Finally, the necessity of heat dissipation design of PFC circuit is analyzed, and the design analysis and structure of prototype heat dissipation are given. The prototype is made. Under the input of 115V, the efficiency of the whole machine can reach 94 and the current harmonics meet the relevant standards. The experimental results show that the prototype has good performance such as high reliability, high power factor and high efficiency. The effectiveness of the design in this paper is illustrated.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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