【作者】 范海峰；

【导师】 徐德鸿；

【作者基本信息】 浙江大学 ， 电力电子与电力传动， 2004， 硕士

【摘要】 高功率密度双向DC-DC功率变换器能够高效率、灵活地实现对电能双向流动的控制，将广泛地应用在电动汽车、航天供电系统、新能源再生能源发电等系统中。但是双向DC-DC功率变换器要在电动汽车、航天等许多应用场合获得实际应用仍面临三大问题，即双向DC-DC功率变换器的功率密度、电磁兼容性和成本问题。软开关技术是解决功率密度和电磁兼容性的关键技术。相移控制双向DC-DC功率变换器因具有功率器件电压，电流应力小，定频工作和无须增加辅助器件即可实现功率器件的零电压开关条件等优点而受到关注。研究表明，当相移控制双向DC-DC功率变换器的输入电压或输出电压偏离标称电压时，相移控制将在双向DC-DC变换器中造成严重的环流，导致通态损耗的迅速增加和软开关条件的破坏。而在电动汽车、航天等能量管理系统中，无论是双向DC-DC功率变换器输入还是输出的电压变化范围都是很大的，相移控制双向DC-DC功率变换器的应用遇到了严重的限制。 PWM控制双向DC-DC功率变换器具有对输入和输出电压大范围变化适应性强的优势；相移控制具有无须辅助开关即可实现双向DC-DC功率变换器零电压开关能力的优势。本文综合PWM控制双向DC-DC变换器和相移控制双向DC-DC变换器的优势，探讨将脉宽调制与相移控制相结合的具有高功率密度、高效率和高电磁兼容性的双向DC-DC功率变换器拓扑及应用技术。文中介绍了相移加PWM复合控制技术的实质，并从电路拓扑理论出发，推导出相移与PWM复合控制双向功率变换器拓扑族，最后以一个具体电路为实例阐述了相移与PWM复合控制双向DC-DC变换器的工作原理，给出了控制电路的设计方法，对变换器的损耗构成进行了详尽的分析，给出了各部分损耗的数学模型，最后给出了实验结果。更多还原

【Abstract】 Bidirectional DC-DC converters can easily control the transfer of power between two DC sources, and will be widely used in applications such as electric vehicles, aerospace power systems, and new power generation system which utilize clean energy. However, there exit three key problems in their applications, which are power density, EMC, and cost. Soft switching is one of key technology to solve these problems. Phase-shift bidirectional DC-DC converter is attractive since it operated with fixed frequency, has small voltage and current stress and can realize ZVS without auxiliary switches. However, it has high current stresses and narrow ZVS range when the amplitude of input voltage is not matched with that of output voltage. Both the range of input voltage and that of output voltage are very wide in applications such as electric vehicles and aerospace power systems.PWM plus phase-shift bidirectional DC-DC converter features reduced current stress, conduction losses, switching losses of semiconductors and wide ZVS range. Actually, PWM plus phase-shift control can be extended to a family of bidirectional DC-DC converters. In this thesis, a technique to synthesize bidirectional DC-DC converter topologies is presented. Operation principle, design of control circuit, loss analysis and experimental results of one PWM plus phase-shift bidirectional DC-DC converter are provided.更多还原