高精度数控恒流源设计与实验  

Design and Experiment of High Precision Numerical Control Constant Current Source

作　　者：余金栋[1] YU Jin-dong(Guangdong Construction Polytechnic,Guangzhou Guangdong 510450)

机构地区：[1]广东建设职业技术学院,广东广州510450

出　　处：《数字技术与应用》2020年第3期5-6,共2页Digital Technology & Application

基　　金：广东省公益研究与能力建设项目(2015A030401107)。

摘　　要：采用TL082集成运放和IRF640大功率场效应管构成恒流源主电路,以AT89C51单片机、4*4键盘、液晶显示器和12位A/D、D/A转换器构成数字控制系统,合理计算反馈电路的参数,实现高精度控制输出电流并进行测量。试验表明,电流在20mA^2000mA范围内可1mA步进或随机预置,控制和测量误差达到0.1%+3个字。The integrated operational amplifier TL082 and high power FET IRF640 are used to form the main circuit of constant current source.Microcontroller AT89 C51, 4 * 4 keyboard, LCD, 12 bit A/D and D/A converter are used to form the digital control system. By reasonably designing the parameters of the feedback circuit, the output current is controlled and measured the output current with high precision. The experiment shows that the current can be changed by 1 mA step or preset random in the range of 20 mA-2000 mA, Output and measuring error reaches 0.1% plus 3 words.

关 键 词：恒流源 数字控制 场效应管 A/D D/A 

分 类 号：TN709[电子电信—电路与系统]