介绍了一种高精度数控直流电源的总体方案和主要电路的设计.该电源以开关稳压芯片LM2596和高性能16位数字信号控制器dsPIC30F4013为基础,将开关直流稳压电源的高效率性和嵌入式系统的高精度数据采集处理能力相结合,采用数字电位器MAX5478实现输出电压的微步进调节,具有输出电流保护功能、实时显示电压电流、矩阵键盘人机交互功能.测试结果表明,该电源具有输出性能稳定、带负载能力强等优点,具有一定的实用价值.%The paper introduced design of an overall scheme and main circuit of high-precision digital controlled DC power supply. The power supply is based on switch regulator chip LM2596 and digital signal controller dsPIC30F4013, which combines high-efficiency of DC voltage-stabilized power and capabilities of high-precision data acquisition and processing of embedded system, and uses digital potentiomete MAX5478 to achieve adjustment of output voltage. The power supply has functions of output current protection, real-time display of voltage and current, matrix keyboard interactive feature. The test results showed that the power supply has advantages of stable output performance, strong load capacity and has practical value.
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