【作者】 张肱霈；

【导师】 黄念慈；

【作者基本信息】 四川大学 ， 电力电子与电力传动， 2005， 硕士

【摘要】 软开关技术一直是电力电子领域研究的热点,特别是在电源设计领域应用最为广泛。在无源和有源两大类软开关技术中,不使用额外开关元件、检测手段和控制策略的无源方式在附加成本、可靠性、变换效率、性价比等方面占有较强优势。 本文着重叙述了软开关技术的理论、应用及存在的问题,由此引申出基于无源无损缓冲电路单元的无源软开关变换的概念和实现方式。通过使用缓冲电路单元,主开关开通时所产生的di/dt被一个串联小电感所限制,主开关关断时所产生的dv/dt被一个并联小电容所限制,从而实现了主开关的软开关变换。在理解了无源软开关工作原理和参考了现有无源无损缓冲电路搭建方式的基础上,设计了一种新型无源软开关Boost变换器,详细分析了它的基本工作原理和参数设计要求。 最后,制作出了一台试验样机并进行了性能测试,实验结果表明:这种变换器与那些需要辅助开关来实现主开关的软开关工作的变换器相比,具有结构简单、易于控制、成本较低的特点,从而验证了方案的可行性和有效性。更多还原

【Abstract】 The research of soft-switching technology is always a hotspot in Power Electronics area, especially applying in power supply area widely. Compared with the active soft-switching technology, the passive method without additional , switching-component , inspectable measures and controlled recources has powerful predominance on additive cost , dependability, transpositional efficiency and performance-cost ratio. This paper emphasizes on the theories, applications and shortages of soft-switching technology, and extends in the concepts and realizative fashions of passive soft-swithing converters based on passive-lossless-snubber cells. By using the proposed snubber cells, the turn-on di/dt was restrained by a small inductor, and the turn-off dv/dt was restrained by a small capacitor, so the mainly switch component compulished the soft-switching transformation. Based on understanding the principle of passive soft-switch and consulting the egisted passive-lossless-snubber cells, a novel passive soft-switching Boost converter was been designed. At the same time , the basic operatian priciples and design rules of the parameters were presented in detail.At last, a high performance-cost ratio passive soft-switching Boost converter prototype has been made. After a successful experiment, we can draw the conclusion that the converter is simple, easilycontrolled and cost less, compared with those converters that need an auxiliary switch to make the main switching device working in soft-switching condition. In a word , the experiment is carried out todemonstrate its validity and feasibility.更多还原