太阳能作为一种无污染、取之不尽、用之不竭的绿色能源，光伏产业的发展受到世界各国的重视，尤其是光伏发电技术得到了快速发展。光伏发电系统有DC-DC升压变换环节和DC-AC逆变环节。DC-DC环节不仅将电压匹配到DC-AC环节电压，而且对于光伏电池最大功率的跟踪，工作效率的提高有着很重要的意义。电力电子技术在光伏发电中的大力应用，对光伏发电的高频化，高效率起了重大意义。 本文设计了一台以TMS320F2812为控制核心的500W DC-DC变换器。 首先，应用MATLAB对光伏电池数学模型进行仿真，对不同光照强度、不同温度下电池的输出特性曲线进行分析，并以此强调了最大功率跟踪(MPPT, Maximum Power Point Tracking)的意义，对经典的MPPT算法进行了比较、分析、优化，最后通过基于BOOST DC-DC电路模型对优化算法进行仿真验证，仿真结果表明MPPT算法实现了最大功率点的快速稳定跟踪。 其次，对经典的DC-DC和软开关电路进行了简单分析、介绍，对用于光伏发电移相全桥DC-DC软开关电路进行了分析、比较，选取滞后桥臂串联二极管的移相全桥软开关拓扑电路为主电路，并进行工作过程详细分析，对主电路各个器件参数进行了详细设计以及选型，最后通过MTALAB对主电路的工作过程进行了仿真、验证。 再次，设计了基于TMS320F2812为核心的控制系统，对控制系统的控制方案、软件(PWM调制，控制主程序，中断子程序等)和硬件电路(驱动/隔离电路，电压、电流采样电路，电压、电流保护电路)进行了详细设计分析。 最后搭建了一个500W的光伏用软开关电路进行实验，实验结果表明主电路设计合理，成功实现了ZVZCS，变换器工作稳定可靠。

As a non-polluting, inexhaustible and green energy, the development of solar industry attached much attention by the countries of the world, especially the technology. There were two parts in photovoltaic power generation system, the one was DC-DC, and another was AC-DC. The DC-DC part not only matched the voltage of the AC-DC, but also tracked the maximum power point which was very important to improve efficiency of the system. The power electronics technology applied energetically in the photovoltaic played a great significance to high-frequency, high efficiency. Firstly, the photovoltaic cell was simulated by the MATLAB, the output characteristic curves were analyzed under different Light intensity and temperature. The Analysis result showed the importance of the MPPT (Maximum Power Point Tracking), and then, the classics MPPT algorithms were compared, analyzed and optimized. Finally, the optimized algorithm was verified by the boost DC-DC MATLAB model. Secondly, the classical models of the DC-DC and Soft-switching circuits were introduced simply, the soft-switching circuits used in the photovoltaic power generation were analyzed and compared, and the Phase-shifted full-bridge ZVZCS DC-DC which topology circuit series diode on the lagging bridge-arm, and then, the working principle was analyzed in detail, the components of the topology circuit were designed and selected in detail. The circuit model was verified by the MATLAB. Thirdly, the control system which based on TMS320F2812 was designed, and the Control Concept, software (PWM modulation, main program and subroutines) and hardware (isolating and driving circuit, sampling circuit, protection circuit) were designed. Finally, a 500W phase-shifted full-bridge ZVZCS DC-DC converter test prototype was fabricated. The results showed the design of the main circuit was reasonable and successful, the converter was stable and reliable.