本文介绍了一种控制对象以中小型UPS为模型的、基于TMS320F240的数字化控制平台的样机实验系统。经对比系统采用了单极性调制的SPWM方式，并根据核心处理芯片的各类资源给出了一套具体的软硬件数字化实现方案。系统硬件部分主要包括输出电压、输出电流、市电频率/相位等各类信号的采集和处理，以及输出PWM信号的隔离、驱动等。系统软件部分则包括UPS各种系统功能的实现，其中主要研究了软件锁相环(市电跟踪)、有效值调节、各类保护、PWM波的生成、闭环控制等的实现。-This article describes a control object model for small to medium-sized UPS prototype experimental system based on TMS320F240 digital control platform. By comparison system unipolar modulation the SPWM way, given a specific set of hardware and software digitize all types of resources and the core processing chip implementations. The system hardware mainly includes the output voltage, output current, mains frequency/phase and other types of signal acquisition and processing, and the output of the PWM signal isolation, drive. System software part includes the realization of the UPS a variety of system functions, the main research a software PLL (Mains tracking), valid value adjustment, the realization of all kinds of protection, PWM wave generation, closed-loop control.