关键词：数控电源 步进 单片机
Abstract
This paper gives an introduction of Program Control DC Power Supply, including the basic concept, its features, the generation technology , classification, application, the present related researches and its future development. Then the paper briefly explains the process of making a specific program. Furthermore, the paper focuses on the introduction of the system hardware design and the system software design, explaining the design ideas as well as the simulation and debugging. Finally this paper gives a simple summary of this design.
The design of DC power supply controlled by program has the following features: First, the accuracy of each step is 0.1V. Second, the range of the output voltage is 0～15V. Third, the output current can be reached 2A. With AT89C51 used as the master chip, the output voltage of this design is controlled by the DAC module circuit, of which the main part is the chip DAC0832. And when the voltage is amplified the voltage module gets reference voltage, while the real output voltage and current are made by the voltage module LM350. Meanwhile, three keys are used to change the voltage, also the digital display module is applied to this design.
