LLC谐振全桥DCDC变换器设计修改

LLC谐振全桥DC/DC变换器设计

摘要：电力电子变压器(PET)作为一种新型变压器除了拥有传统变压器的功能外，还具备解决传统变压器价格高、体积庞大、空载损耗严重、控制不灵活等问

题的能力，值得深入研究。PET的DC-DC变换器是影响工作效率和装置体积重量

的重要部分，本文以PET中DC-DC变换器为主要研究对象，根据给出的指标，对

全桥LLC谐振变换器的主电路进行了详细的设计，主要有谐振参数的设计，利用

磁集成思想，设计磁集成变压器，可以大大减小变换器的体积和重量，并在参数设

计的基础上完成器件的选型。此外，根据给出的参数，计算出各部分损耗，进而计

算出效率，结果满足设计效率的要求。利用PEmag和Maxwell仿真软件设计磁集

成变压器，验证磁集成变压器参数。运用Matlab/simulink对PET中的DC-DC变换

器模型进行仿真分析，并在实验样机上进行实验研究，实验结果验证了DC-DC变

换器的理论研究和设计方法的正确性及有效性。

关键词：电力电子变压器；LLC谐振变换器；损耗分析；磁集成变压器

中图分类号：TD62 文献标识码：A 文章编号：

Design of LLC resonant full bridge DC / DC converter

Abstract: The Power Electronic Transformer (PET) as a new power transformer,not only has the functions of traditional transformers, but also has the ability to solve the problems of traditional power transformers that the high price, huge volume, prodigious no-load loss and inflexible control, and it is worth in-depth study.The DC-DC converter of PET is an important part of affecting work efficiency, volume and weight of the device. This paper studies the DC-DC converter mainly, then，according to given indexes, main circuit of full-bridge LLC resonant converter is designed in detail, including the design of resonant parameters. And the magnetic integrated transformer is designed with the idea of magnetic integration, which greatly reduces the converter volume, and the selection of devices is completed on the basis of parameters design.In addition, according to the given parameters, losses of each part and the efficiency are calculated. The results meet the efficiency requirements of design. PEmag and Maxwell simulation software are used to design magnetic integrated transformer, and verified the magnetic integrated transformer parameters.Matlab/simulink is used to simulate and analyze the DC-DC converter performance of PET. A prototype of full-bridge LLC resonant converter is developed and system test platform is built according to the theoretical research and simulation results. The correctness and effectiveness of theoretical research and design methods of the DC-DC converter are verified by analyzing the waveforms of the test.

Key words:power electronic transformer; LLC resonant converter; loss analysis; magnetic integrated transformer

煤矿井下存在着各种电压等级的电源以及电气设备，供电系统十分复杂。为了满足不同电压等级的要求[1]，目前井下常用传统电力变压器来进行变压和能量传递。这种变压器制作工艺简单、可靠性高，但是其价格高、体积庞大、空载损耗严重、控制不灵活，而且，如果出现电压不平衡、谐波、闪变等现象，无法维护电力设备的正常工作[2]。所以，现在亟待解决的问题是如何保证电气设备在安全工作的情况下，给用户供应可靠稳定的电能[3]。电力电子变压器(PET)应运而生，它除了拥有传统变压器的功能外，还具备解决上述难题的能力，作为一种新型变压器，近年来成为国内外学者研究的热门问题[4-9]。LLC拓扑，作为一种双端谐振拓扑，已经在许多DC/DC功率变换方案中得到应用，但在PET上的应用尚未广泛。本研究将依据LLC全桥DC/DC变换器的原理设计一款PET，利用LLC谐振变换器本身的诸多优势达到提高PET效率的目的。