高精度、宽输出高压直流电源控制模块的设计

Design of Control Module for DC Power Supply with High Precision and Output Range of Voltage

针对经典的密里根油滴实验对直流电源的高精度、宽输出等要求,进行了高压直流电源中控制模块的硬软件设计.采用了双12 bit数模转换并联构成14 bit数模转换的方法,在不增加成本的基础上,提高了控制电压的分辨率.采用软件补偿的方法提高控制精度,将实际控制电压的最大误差由0.12 V改善到了0.000 6 V.实验结果表明,高压直流电源的输出范围为-1 200～1 200 V,精度为±0.072 V.

This paper completes the hardware and software design of the control module in the DC power supply with high precision and output range of voltage. This design uses a double 12-bit digital-to-analog conversion to form a 14-bit digit- al-to-analog conversion method,which improves the resolution of the control voltage without increasing the cost. In order to improve the actual control accuracy feature, the design uses software compensation method to improve actual control voltage maximum error from 0.12 V to 0.000 6 V. Through this design, DC power supply can achieve requirements of the output range of -1200- 1200 V and the accuracy of ±0.072 V.