【作者】 罗志军；

【导师】 尹斌；

【作者基本信息】 河海大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 本文主要介绍了2.5KW自冷式高频开关电源的研制。首先简单讨论了目前高频开关电源的研究热点，对各种变换电路拓扑结构形式进行了分析比较，然后重点分析了移相全桥变换器的工作原理和软开关技术的实现。软开关能够提高变换器的效率和降低EMI，通过比较目前多种实现软开关技术方案，本文研究了一种由辅助桥臂和谐振电感组成的二极管辅助谐振换流网络，不但很好地实现了ZVS，并且克服了副边二极管上寄生振荡；同时，该拓扑也使副边二极管和辅助二极管都工作于软开关状态，进一步降低了开关损耗，为系统能够在自冷的条件下稳定运行创造了条件。 对于控制系统的设计，应用了基于小信号模型的开关电源的建模设计方法，优化了该电源电路控制环节的调节器参数。通过Orcad PSpice9.2对主开关电路的参数仿真，安装和调试了样机，并分析比较了实验波形与数据，证明了该拓扑结构的实用性。最后介绍了该电源模块主要硬件电路的设计和监控系统软件的开发。更多还原

【Abstract】 The analysis and design of 2.5KW self-cooled high-frequency power supply is presented in this thesis. This thesis firstly discusses some research focus of high-frequency power supply and variable circuit topologies are compared here. Then it emphasizes the operating principle of phase shift full bridge converter and realization of soft switching techniques. Soft switching can improve the converter’s efficiency and reduce EMI. In comparison of some methods of approaching soft switching, this thesis presents a Diode Auxiliary Resonant Commutating Network which is composed by an auxiliary bridge and a resonant commutating inductor. This topology not only well realizes zero voltage switching (ZVS), but also overcomes the parasitic oscillation in the secondary side Diodes. Simultaneously, this topology makes both the secondary side diodes and auxiliary diodes operate on the soft switching state too, which reduces more switching losses and provides requirement for the system to run stably under the condition of self-cooled.Modeling and designing method of switching power supply based on small-signal modeling is applied in the control system, which optimizes the regulator parameter in this control system. A sample power supply is developed and debugged, based on parameter simulation in the environment of Orcad PSpice9.2. Analysis of experimental waveforms and data validate the practicability of this topology. The design of main hardware circuits of power supply and development of software of surveillance and control system are introduced at last.更多还原