摘要:电源技术尤其是数控电源技术是一门实践性很强的工程技术，服务于各行各业。电力电子技术是电能的最佳应用技术之一。当今电源技术融合了电气、电子、系统集成、控制理论、材料等诸多学科领域。随着计算机和通讯技术发展而来的现代信息技术革命，给电力电子技术提供了广阔的发展前景，同时也给电源提出了更高的要求。该直流稳压电源的输入为交流22OV，50Hz，输出电压为1.5V—13V内连续可调，输出电流为500mA以上，并能够直观的显示输出电压。电源的控制电路选用STC89C52单片机为核心，以及数/模转换功能，具有线路简单、稳定性好、显示清晰直观等特点。文章中分析了电源的整体结构和工作原理，并详细的讲述了稳压电路、数/模转换电路、显示电路等电路的工作原理。给出了控制电路的硬件实现和主要的软件流程设计。 

关键词   单片机；数码管；数/模转换；稳压

Abstract:Digitally controlled power supply technology, especially technology is a strong practical engineering technology, and service to all industries. Power electronics technology is the best application of energy technologies. Technology combines the power of today's electrical, electronics, systems integration, control theory, materials, and many other subject areas. With the computer and communication technologies developed from modern information technology revolution, to the power electronics technology to provide a broad development prospects, but also to set a higher power supply requirements. The DC power supply input for the exchange of 22OV, 50Hz, output voltage of 1.5V ~ 13V continuously adjustable output current of 500mA or more and be able to display visual output voltage. Power supply control circuit use STC89C52 microcontroller as the core, as well as D / A converter functions, with simple circuit, good stability, showing a clear and intuitive and so on. The article analyzes the power of the overall structure and working principle and in detail about the pre-regulator circuit, D / A converter circuit, display circuit so the circuit works. Gives the control circuit hardware implementation and the main software flow.

Key words:  SCM; digital pipe; D / A converter; Regulators