基于STM32的高精度程控电流源设计

摘要

针对传统开关型电流源纹波大,精度低的缺点,采用线性稳流结构设计出一种基于STM32的高精度程控电流源.硬件上以STM32单片机为控制核心,以16 bit DAC8830数模转换芯片产生的电压基准作为误差放大器的基准来实现电流源的程控功能,以INA286为电流检测芯片,配合LTC2400模数转换器实现输出电流回读.软件上设计了程控参数输入界面和电流回读界面,设计了SCPI解析器,通过指令实现远程控制功能.结果表明,该程控电流源纹波电流小,输出精度高,具有一定的应用价值.%In order to solve the weakness of high ripple and low precision on switching current power,a programmable high-precision current source based on STM32 was designed by linear current regulator. In the aspect of hardware,the STM32 microcontroller was used as control unit. The current can be controlled by system through setting the reference volt by DAC883016 bit DAC. The chip of INA286 and LTC240024 bit ADC was used in current detection. In the aspect of software,the parameter input interface and current interface were designed. The SCPI parser was designed so that the system can be controlled by standard instructions. The results show that it is characterized by low ripple and high accuracy.