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摘要随着电力电子技术的迅猛发展，高效、节能、环保一直是现代电力行业追求的目标，开关电源以其效率高，能耗低，体积小，功率因数高，可靠性好等特点在电子领域中脱颖而出。在此基础上，随着电子器件的体积不断减小，将电路加以集成是开关电源的主流方向。随着直流变换技术的进步，它迅速发展，占据巨大的市场份额。为充分利用开关电源优势，尽可能降低损耗，人们开始转向软开关的移相全桥电路的研究。
- 上一篇：SEP3203嵌入式系统的LED显示控制电路设计
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本论文是在理解开关电源性质的基础上，设计移相全桥高频软开关电路。在论文中，首先分别阐述了开关电源的优缺点和移相全桥电路的原理，然后根据应用场合和性能指标，确定电路拓扑结构，给出了整体电路的设计框架：包括逆变桥的设计，软开关电路的设计，变压器的设计，滤波电路的设计、数字控制电路的设计、缓冲吸收与电路的设计等。
接着根据要求给出了各部分电路的参数：开关管、谐振电路中的电感和电容、磁芯型号、导线线径、输出整流管等等，并选择器件。此外，还就实验中遇到的几个关键问题——死区时间，电压尖峰，全桥电路驱动信号的实现等进行讨论，完善电路功能。在数字控制电路中运用了DSP中的芯片MC56F8013，主要涉及到PWM模块、模数转换模块、定时器模块；用Codewarrior软件编写了驱动电路代码，并进行了程序调试。19145
最后，在建立整体模块的基础之上，应用saber软件对电路进行波形仿真，检测波形后，在电路板上完成器件的焊接，得到设计样本。最后对样本进行测试，在示波器上观察结果，对其稳定性和工作效率等做了评估，证明了理论分析的正确性和参数设计的合理性，符合设计目的。
关键词 开关电源 软开关 移相全桥 设计 数字控制
毕业设计说明书（论文）外文摘要
Title The design of shift to full bridge high frequency switching power supply
Abstract
With the rapid development of power electronic technology, high efficiency, energy saving, environmental protection has been the pursuit of the goal of modern power industry, switching power supply for its high efficiency, low energy consumption, small volume, high power factor, high reliability talent showing itself in the field of electronics. On this basis, with decreasing the size of the electronic device, the circuit to integration is the mainstream direction of switching power supply. With the DC conversion technology, with its rapid development, occupy a large market share. Switching power supply to take full advantage of the advantages, reduce the loss as far as possible, the full bridge circuit of phase shift people begin to turn to the soft switch.
This thesis is based on the understanding of the principle of switching power supply, the design of phase shifted full bridge high frequency soft switch circuit. In this paper, firstly the principle of switching power supply and the advantages and disadvantages of phase shifted full bridge circuit, and then depending on the application and performance indicators, determine the circuit topology, the design framework of the whole circuit: including the design of inverter bridge, design of soft switch circuit, transformer design, the filter circuit design, digital the design of control circuit, snubber and circuit design.
Then according to the requirements of each part of the circuit parameters are given: the switch tube, the resonant circuit of inductance and capacitance, core type, wire diameter, output rectifier tube and so on, and the choice of devices. In addition, also some key problems encountered in the experiment -- the dead time, peak voltage, the full bridge circuit are discussed such as the realization of drive signal, perfect circuit function. In the digital control circuit uses the DSP chip MC56F8013, mainly related to PWM module, analog-to-digital conversion module, timer module; Codewarrior software used to prepare the driver code, and the program debugging.
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