MCU because of physical volume small, the function is well-found, the credibility is high, is subjected to the concern by people more and more . The mcu-based circuit than traditional circuit design with greater flexibility.
With the development of the times, MCU technology has spread to our lives, work, and research in all fields. Along with the life horizontal exaltation, people pursue humanized thing more and more, the traditional power supple has already can't satisfied people's demand .this paper will introduce a digital DC voltage power supply, and analyse the digital technology and simulation technology mutual conversion concept.
This system take the DC current source for the base ,89S52 for mainly controller, through keyboard to establish the direct current power supply’s output voltage, install stepping up to 0.1V levels, and the LCD shows the output voltage and the actual output current. This system programmed by MCU to set digital signals, after D/A converters (DAC0832), the simulation export volume is sent to the amplifier. Then through the adjustable voltage regulator LM338 output voltage. The design use the digital technology in MCU, D/A converters, LCD display, and other circuits, It has advantages such as high-precision control and product easily.
Keywords : digital； D/A conversion；89S52
