基于PSIM软件，在buck电路设计整个过程。将每一个部分分开，单个分析，最终实现buck电路DC-DC.-PSIM-based software, the whole process in the buck circuit design. To separate each part, a single analysis, and ultimately buck circuit DC-DC.

本文首先分别从光伏电池特性、Buck电路基本原理，最大功率跟踪方法、PI补偿、PWM调制等方面分别进行分析设计，最后利用Simulink对光伏发电系统进行了仿真，并对其进行最大功率跟踪。-Firstly separately the PV cell characteristics, Buck circuit basic principle, the maximum power point tracking method, PI compensation, PWM modulation and

Design and control of a buck-boost converter