System Design of Digitally controlled Constant Current Source
In order to provide stable and adjustable current source for portable systems,this paper designs a digitally controlled constant current source.According to the input of independent key,the output of the microcontroller digital volume controls digital-to-analog converter by Voltage-Current conversion module to get the constant current output.The output module consists of the operational amplifier and the power transistor TIP 122,which is used for voltage-current conversion.At the same time,the value of output current is obtained by sampling resistor to convert the real-time acquisition and monitor the output of constant current source.The experimental results show that the system output ranges from 0 mA to 240 mA.The value of constant current can be controlled by stepper key,and the measurement error ratio can meet the requirement of design.
Digital Control Step Constant current source
Aijun Zhu Yinchao Shao
School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 54 School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 54
国际会议
济南
英文
387-390
2012-12-29（万方平台首次上网日期，不代表论文的发表时间）