【作者】 王瑞妙；

【导师】 王明渝；

【作者基本信息】 重庆大学 ， 电气工程， 2010， 硕士

【摘要】 随着电力电子技术的发展,双向DC/DC变换器在电动汽车、汽车电子、通信电源和航天航空以及储能系统等领域的应用前景广阔,要求双向DC/DC变换器处理的电压、电流等级越越来越高。鉴于目前开关管的发展水平,传统的两电平变换器如果应用在中高压大容量场合,就很难满足其处理要求,于是从拓扑结构入手来增强双向DC/DC变换器的特性,以扩展其应用范围,提高其处理电压、电流水平的能力。将多电平技术引入双向DC/DC变换器可以降低开关管承受的电压水平,从而解决了在中高压场合应用的问题。在学习了国内外多种多电平双向DC/DC变换器的基础上,本文研究了一种基于基本半桥模块的双向DC/DC变换器拓扑结构。以此基本模块为基础,拓展了一系列的拓扑结构,包括级联双向DC/DC变换器拓扑、多相双向DC/DC变换器拓扑、组合型多电平双向DC/DC变换器拓扑以及复合型多电平双向DC/DC变换器拓扑等。文中主要对复合型三电平双向DC/DC变换器拓扑进行了工作原理分析,该变换器不仅可以降低开关管的承受电压水平,同时能够实现电压的连续变化,而且无需变压器就能够实现大变压比变换。为验证变换器理论的正确性,搭建了三电平双向DC/DC变换器拓扑的MATLAB仿真模型,进行了相应的仿真实验。在开环控制方式下,分析了参数变化对变换器特性的影响,观察了不同占空比比例下的变换器输出特性。在闭环控制方式下,从不同输入电压、给定电压扰动、输入电压扰动等方面对变换器特性进行了分析。仿真实验表明,该变换器能够实现电压的连续、大升降压比变化,同时降低了开关管的承受电压水平,为其在大电压的应用提供了有力的保障。最后设计制作了一台试验样机,试验样机包括主电路、驱动电路、控制电路以及检测电路等。通过编写、调试控制程序,在DSP 2812开发板上输出PWM控制信号,驱动主电路工作,得到了驱动信号的部分实验波形。更多还原

【Abstract】 With the development of power electronics technology, bi-directional DC/DC converters is applied more and more widely in the areas of electric vehicles, automotive electronics, communication power and aerospace, energy storage systems, and so on, which require bi-directional DC/DC converters to handle higher voltage and current level. While as the current equality of the switch, if applied to large-capacity high-pressure situations, traditional two-level converter is difficult to meet its processing requirements, so topology is a useful way to enhance property, extend applied area and enhance processing ability for voltage and current. For applying to large-capacity high-pressure situations, multi-level technology is introduced to bi-directional DC/DC converters to reduce the voltage level.After learning of a variety of multi-level bi-directional DC/DC converters home and abroad, this paper investigated a topology based on the basic half-bridge module, and expanding a series of topology, which include cascaded bi-directional DC/DC converter topology, multi-phase bi- directional DC/DC converter topology, combined multi-level bi- directional DC/DC converter topology and complex multi-level bi- directional DC/DC converter topology, and so on. And then this paper analyzes the operation principle of the complex three-level bi- directional DC/DC converter topology, which shows that this topology can not only reduce the tolerance of switch voltage level but also achieve the continuous voltage change and a large ratio without transformer.In order to verify the correction of this topology a three-level bi-directional DC/DC converter simulation model is built and completed the simulation experiments. In the open-loop control mode, affection parameter on the converters is analyzed and output characteristic under different duty ratio is observed. In the closed-loop control mode, output characteristic is observed in the situation of different input voltage, given voltage disturbance and input voltage disturbance. Simulation results show that this converter can not only achieve large ratio continuous changes but also can reduce the tolerance of switch voltage level, which providing strong protection for its application in high voltage.Finally, a test prototype is designed, including the main circuit, drive circuit, control circuit and detection circuit. By writing and debugging control program, the PWM control signal is output to drive the main circuit on the DSP 2812, and get part of the PWM test waveform.更多还原