宽增益多谐振变换器研究

发布时间：2019-04-16 09:32

【摘要】：宽增益直流变换器在新能源发电、电动汽车车载充电机、通信电源等电源系统中有着广泛的应用。与常规宽增益谐振变换器相比,多谐振变换器仅在传统LLC谐振腔增加了一个陷波器,具有结构简单、易于实现等优点。将陷波器放在变换器原边,本文首先对LCLCL变换器进行研究,分析了变换器的工作原理,利用基波分析法研究了变换器的增益特性。分析得出,LCLCL变换器不仅能实现宽增益,还可利用三次谐波传递功率,具有内在的缓启与短路保护能力等优点。为了实现变换器的高效率,本文分析了谐振网络参数对变换器的影响,从效率最优的角度确定参数优化设计目标,并在此基础上研究了参数优化设计方案。文中以3.3kW样机为例给出了详细参数设计流程,并进行了实验验证,实验结果证明了理论分析和参数设计的正确性。为了适应于低压输入高压输出场合,本文对LCLCL变换器进行了改进,将陷波器放在变换器副边,提出了五元件LLC-LC多谐振变换器拓扑。与LCLCL变换器相比,该变换器提高了谐振点的增益,降低了陷波器上的导通损耗。本文对其原理与增益特性进行了详细分析,讨论了与LCLCL变换器特性上的异同点,给出了关键参数设计考虑,并搭建了400W样机平台进行实验验证。为了对比两个变换器,制作并调试了一台规格参数完全相同的LCLCL变换器样机,实验结果表明,在升压场合,LLC-LC变换器更具有优势。
[Abstract]:Wide-gain DC-DC converter is widely used in power supply systems such as new energy generation, on-board charger of electric vehicles, communication power supply and so on. Compared with the conventional wide-gain resonant converter, the multi-resonant converter only adds a notch filter to the traditional LLC resonant cavity, which has the advantages of simple structure and easy realization. The notch filter is placed on the original side of the converter. Firstly, the LCLCL converter is studied, the working principle of the converter is analyzed, and the gain characteristics of the converter are studied by the fundamental analysis method. It is concluded that the LCLCL converter can not only realize wide gain, but also make use of the third harmonic to transfer power. It has the advantages of inherent slow-start and short-circuit protection. In order to realize the high efficiency of the converter, this paper analyzes the influence of the resonant network parameters on the converter, determines the optimization design objective of the parameters from the angle of optimal efficiency, and studies the parameter optimization design scheme on the basis of this. Taking the 3.3kW prototype as an example, the detailed flow chart of parameter design is given and verified by experiments. The experimental results show that the theoretical analysis and parameter design are correct. In order to adapt to the low voltage input and high voltage output, the LCLCL converter is improved in this paper. The notch filter is placed on the secondary side of the converter, and a five-element LLC-LC multi-resonant converter topology is proposed. Compared with the LCLCL converter, the converter improves the gain of the resonant point and reduces the on-off loss of the notch filter. In this paper, the principle and gain characteristics of the converter are analyzed in detail, and the similarities and differences with LCLCL converter are discussed. The design consideration of key parameters is given, and a 400W prototype platform is set up for experimental verification. In order to compare the two converters, a prototype of LCLCL converter with the same specifications and parameters has been fabricated and debugged. The experimental results show that the LLC-LC converter has more advantages in the boost case.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46

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