【作者】 孙筱琳；

【导师】 李国勇；

【作者基本信息】 哈尔滨理工大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 随着通讯技术和电力系统的发展,对通讯用电源和电力操作电源的性能、重量、体积、效率和可靠性都提出了更高的要求。而应用于中大功率场合的全桥变换器与软开关的结合解决了这一问题。因此,对其进行研究设计具有十分重要的意义。首先,论文阐述PWM DC/DC变换器的软开关技术,且根据移相控制PWM全桥变换器的主电路拓扑结构,选定适合于本论文的零电压开关软开关技术的电路拓扑,并对其基本工作原理进行阐述,同时给出ZVS软开关的实现策略。其次,对选定的主电路拓扑结构进行电路设计,给出主电路中各参量的设计及参数的计算方法,包括输入、输出整流桥及逆变桥的器件的选型,输入整流滤波电路的参数设计、高频变压器及谐振电感的参数设计以及输出整流滤波电路的参数设计。然后,论述移相控制电路的形成,对移相控制芯片进行选择,同时对移相控制芯片UC3875进行详细的分析和设计。对主功率管MOSFET的驱动电路进行分析和设计。最后,基于理论计算,对系统主电路进行仿真,研究其各部分设计的参数是否合乎实际电路。搭建移相控制ZVS DC/DC全桥变换器的实验平台,在系统实验平台上做了大量的实验。实验结果表明,论文所设计的DC/DC变换器能很好的实现软开关,提高效率,使输出电压得到稳定控制,最后通过调整移相控制电路,可实现直流输出的宽范围调整,具有很好的工程实用价值。更多还原

【Abstract】 With the developments of the communication technology and power systems,a higher demand of the performance,weight,volume,efficiency and reliability of the supply for communication and electricity operation are proposed.Moreover, combined with the soft-switching,the full bridge converter which is used in high-power occasions has been used in resolving the issue.Therefore,it is of great significance for its research and design.Firstly,the thesis has expounded the soft-switching technology of PWM DC/DC converter.And then it has based a main circuit topology of phase-shifted control PWM ZVS full-bridge converter,selected the circuit topology of soft switching technology ZVS which is Suitable for this paper,then expounded its basic principles and the realization strategy of ZVS soft-switching.Secondly,the thesis has designed the main circuit topology which we selected, and gave the methods of parameters designing and calculation for main circuit, including the devices selection of input and output bridge rectifier and inverter bridge;further parameters’ designing with input rectifying filter circuit,high-frequency transformer and the resonant inductor,output rectifying filter circuit.Then,it has discussed the form of a phase-shifted circuit,and then chose chip of phase-shitfed.Besides it has also analyzed the phase-shifted chip-UC3875 in detail. Moreover,it designed and analysised the driving circuit for the main power devices MOSFET.Finally,based on theoretical calculations,it simulated the main circuit system, researched the parameters of system’s different parts,at the same time determined whether they accorded with a practical circuit.Ultimately,the article has structured a test platform for phase-shifted ZVS DC / DC full- bridge converter,on which massive experiments has been done. The results have indicated that the DC / DC converter that were designed by the article can achieve good soft-switching,improve efficiency,and cause the stable control of output voltage.Ultimately,the DC output can realize a wide range adjustment,and it has a good project practical value.更多还原