With the power technical progress, NC adjustable power supply power have become the most popular object of research areas, the prominent feature of the NC is NC characteristics.it embodied in the microcontroller as the core to achieve the power output voltage control.The design of the microcontroller chip for the 89 C51. first, Through digital keyboard input voltage, and then voltage values in the digital display on the final through D / A converters are analog output voltage. This article on the NC adjustable power supply design.
Firstly, the NC adjustable power supply of choice to do a simple background briefing, a comprehensive summary of the NC concept of power, features and design ideas, and other aspects.
Secondly, the NC adjustable power supply design to the system introduced. This paper presented by the NC adjustable power supply design, including a total of two parts of the design: hardware circuit design and software systems design. Hardware, including: the power supply design, figures show circuit, keyboard circuit, SCM circuits, digital / analog converter circuit, analog amplifier and the output current over-current protection circuit. Software includes: MCS module initialization and the implementation procedures. Initialized which include: adjusted stack pointer, the need to use the internal data memory of the initialization, set up the boot NC power output voltage and CPU interruption of the set.
In succession, that is software and hardware integration, the overall realization of the power of the NC digital election, numerical adjustments characteristics.
Finally, the results do the overall design overview and analysis. This includes some of the problems encountered in the design, the choice of components and personal experience and so on.
Key words: NC adjustable power supply; SCM; figures show; digital Choice; numerical adjustment