基于无桥交错并联和谐振技术的车载充电机研究-控制理论与控制工程专业论文.docxVIP

万方数据 万方数据 摘 要 摘 要 传统汽车造成的环境污染和石油资源的减少促进了人们对可替代能源的研 究，电动汽车以其零排放、低噪声受到了重视。电动汽车的发展必须解决电池及 其充电技术问题，车载充电机作为电池充电设备，研发高性能的车载充电机具有 重要意义。本文旨在给出一种车载充电机的高性能拓扑。 车载充电机作为接入电网的车载设备，需要在功率因数、谐波电流、效率及 EMI 等指标上达到要求，满足这些要求需要解决中大功率下使用功率因数校正环 节存在的二极管反向恢复和噪声问题，及整机效率问题。 论文首先通过对主流电动汽车电池的调查和相关标准的查阅，得出了拟研究的 车载充电机的技术指标，为充电机的整体结构确定提供依据。根据技术指标和主 流拓扑的分析，包括对图腾式无桥拓扑、交错并联拓扑、LLC 谐振变换拓扑等的 分析，在概括对比的基础上得出了前级采用无桥交错并联、后级采用全桥 LLC 谐 振变换的整体结构。接着在前后级的基本电路单元的工作原理与控制方法的分析 基础上，详细分析了前后级拓扑的工作模态和控制方法，并对主电路参数和控制 系统进行了设计。最后运用仿真工具对给出的拓扑结构、设计的主电路参数和控 制系统进行了综合验证。 仿真结果表明，本文采用的基于无桥交错并联和谐振变换技术的车载充电机 在功率因数、谐波电流、效率、EMI 等指标上均满足要求，设计的主电路和控制 系统工作正常，有效解决了中大功率下应用功率因数校正技术存在的二极管反向 恢复问题和噪声问题，同时解决了整机效率问题。因此，本文使用的前后级结构 在性能指标符合要求，所采用的分析方法和系统设计是有效的。 关键词：图腾式无桥，交错并联，LLC，车载充电机 I ABSTRACT ABSTRACT Eletric vehicle (EV) is attracting increasing attention because of its zero emission and low noise. It also has the potentiality of solving environmental pollution caused by traditional vehicle and problem of the decrease of oil resource. With the development of EV, the problems of battery and charging equipment should be resolved. As a charging equipments, On-board charger plays an important role in the EV system, especially in the aspect of battery protection. The purpose of this dissertation is to propose a high-perfomance on-board charger. As an charging equipment of EV and interface to power grid, on-board charger must have high performance on these aspects, such as power factor, harmonic current, effiencicy, EMI and so on. In order to achieve these strict requirements,there are some problems needed to be resolved, such as the recovery problem of APFC in the middle or high power level, and efficiency of the charger. Firstly, the dissertation puts forward the objectives of the on-board charger. Secondly, relying on the objectives of the charger and analysis of the mainstream topologies, such as totem bridgeless topology, interleaving topology, LLC resonant topology and so on, it concludes that the proper structure would be the two stage PFC, w