摘要
本文在阐述高频交流环节逆变技术产生和发展的基础上，分析了几种具有代表性的电压源和电流源高频交流环节逆变技术的优缺点。电流源高频交流环节逆变技术克服了电压源高频交流环节逆变技术固有的电压过冲问题，在小功率场合性能优越具有良好的应用前景；但是在大功率场合，一般采用的还是电压源高频交流环节。
本文深入研究了全桥移相控制电压源高频交流环节变换器。这类变换器由逆变器、高频变压器、输出周波变换器、以及输出滤波器构成，适用于高压输出变换场合。输出周波变换器将此高频交流电压波解调成SPWM波，经输出滤波后得到稳定优质的工频正弦交流电压。
从完善电路拓扑的角度出发，本文应用了一种新的高频交流环节逆变电路方案，通过逆变器桥臂的移相，在移相控制的基础上，利用功率MOS管的输出电容和谐振电感(包括了变压器的漏电感)作为谐振元件，使全桥变换器的四个开关管依次在零电压条件下导通，实现恒频软开关。
逆变器是独立的小系统，为使其达到较好的动静态特性，必须采用闭环控制的方式，本文采用了电压反馈的闭环控制方式，使逆变器输出稳定的正弦波。
本文分析研究了高频交流环节中高频变压器与普通变压器的不同并设计了适合论文需要的高频变压器的主要参数。
本文建立了Matlab／Simulink环境下全桥电压源高频交流环节及其整个控制系统的完整仿真模型，其能比较准确的反映整个环节的特性，从而能够合理的选择一些重要的参数，缩短研制周期、节约成本。
Based on an overview of high frequency link (HFL) inverters, the advantages and disadvantages of HFL inverters in some important voltage mode and current mode are discussed in the dissertation. The current mode HFL inverters solve the inherent voltage surge problem in voltage mode HFL inverters, so they have better performance and application prospect in low power application. But the voltage mode HFL inverters often have performance and application in high power application.
The phase-shifted controlled voltage mode converters with HFL are deeply investigated. This kind of converters is constituted of inverter, high frequency transformer and output cycloconverter. The mode is suit for high output voltage field. The SPWM wave is filtered into steady commercial frequency sinusoidal voltage with low harmonic by output cycloconverter.
From the viewpoint of the whole topologies of HFL inverters, a new scheme of HFL inverters is applied. Based on phase-shifted controlled voltage mode, ZVS is achieved with the output capacitance, output inductance of MOS and leaked inductance of transformer.
The inverter is a small independent system. Therefore, to achieve a good performance both statically and dynamically, closed loop control method has to be applied. The paper takes advantage of a single close-loop control method based on voltage feedback, and enables the inverter to produce steady sine wave by the digital PID adjuster designed.
The high frequency transformer is investigated and compared with power transformer. The high frequency transformer suited HFL inverters is designed and parameters are achieved in this paper.
The whole simulation module of control system is built up under the powerful MATLAB/SIMULINK platform. It can precisely reflect the system properties. It will become easier that we select appropriate parameters. Therefore the simulation module would shorten the cycle and economize the cost.
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