CAJ | 학술논문

该文设计了以单片机C8051F020为控制核心的简易直流电子负载.电子负载采用恒流工作模式,恒流方式通过单片机内部DA输出控制NMOS管等电路产生恒定电流,当直流稳压电源电压在一定范围内变化时,流过本直流电子负载的电流保持恒定.在恒流模式下的设定电流非常精准.在不同设定电流下,电子负载两端电压变化10V时输出电流变化值能够控制在0.9%以内.过压保护阈值电压18V附近.电子负载两端的电压,电流测量精度均可满足.同时本简易直流电子负载可以工作在恒阻方式.可设定电阻,并可测得电子负载两端电压与电流为线性关系,即是恒阻模式下的电阻值.
해문설계료이단편궤C8051F020위공제핵심적간역직류전자부재.전자부재채용항류공작모식,항류방식통과단편궤내부DA수출공제NMOS관등전로산생항정전류,당직류은압전원전압재일정범위내변화시,류과본직류전자부재적전류보지항정.재항류모식하적설정전류비상정준.재불동설정전류하,전자부재량단전압변화10V시수출전류변화치능구공제재0.9%이내.과압보호역치전압18V부근.전자부재량단적전압,전류측량정도균가만족.동시본간역직류전자부재가이공작재항조방식.가설정전조,병가측득전자부재량단전압여전류위선성관계,즉시항조모식하적전조치.
This paper introduces the design of a simple DC electronic load by single-chip microcomputer of C8051F020. The electronic load is beads on a constant current mode. Constant current controls NMOS tube circuit to generate a constant current with DA on the MCU. When voltage supplied by the DC power changes within a certain range, the current going through the DC electronic load is a constant. In the constant current mode, setting current is very accurate. When the terminal voltage off Electronic load changes 10V, the changing value of output current can be controlled less than 0.9%. Overvoltage protection volt?age is about 18V.Meanwhile, the simple DC electronic load can work in the constant resistance mode.