CAJ | 학술논문

为提高电工实验室的利用效率及降低实验成本，设计了可调恒流电子负载。利用单片机的数字端口读入电流参考值和启停信号，用片上12位DAC生成负载电流控制器参考值；底层控制采用通用运算放大器实现了P ID调节器，利用模拟电路实现了恒流与过压保护选择性控制。经测试，该电子负载较好地实现了恒流负载模式，并且具有过压保护、键盘输入、数字显示功能，功能完备、成本低，能满足电工实验室的使用要求。
위제고전공실험실적이용효솔급강저실험성본，설계료가조항류전자부재。이용단편궤적수자단구독입전류삼고치화계정신호，용편상12위DAC생성부재전류공제기삼고치；저층공제채용통용운산방대기실현료P ID조절기，이용모의전로실현료항류여과압보호선택성공제。경측시，해전자부재교호지실현료항류부재모식，병차구유과압보호、건반수입、수자현시공능，공능완비、성본저，능만족전공실험실적사용요구。
In order to improve the operation efficiency of the electric circuit lab as well as to reduce the running cost ,an adjustable constant current electronic load is proposed in this research . The current reference command and the start/stop command are read from the digital I/O of the micro-controller and translated into a voltage level issued by the DAC on chip ;the local PID control is implemented in a general purpose operation amplifier ,and an analog protection circuit is designed to toggle the operation modes between constant current and protective voltage control .The experimental results indicate well functionality of constant current control as well as over-voltage protection ,keyboard input ,digital display .The proposed system is suitable for electric circuit lab due to its good functionality and low cost design .