一阶RC电路实验教学改革与问题分析

Experiment Teaching Reform and Problem Analysis of First-order RC Circuit

实验是理论联系实际的重要手段。为了紧密联系电路理论教学与实验教学,针对一阶RC电路实验中存在的问题,改进了实验电路。对实验教学过程中发现的问题,采用基于问题的引导式教学方法,引导学生对电容上非正常的充放电过程进行理论分析,证明电容上非正常充放电波形确实是由于两个开关非同时动作造成的,同时采用Simulink对开关非同时动作过程进行仿真验证,仿真结果与理论分析吻合。最后采用硬件消抖电路消除了电容充电波形上的阶梯状抖动。实践结果表明,改革后的一阶RC电路实验有助于学生掌握一阶RC电路的换路过程和示波器的使用,教学效果良好。

Experiment is an important means to combine theory with practice.In order to closely link the teaching of circuit theory with the teaching of experiment,we improved the experimental circuit to solve the problems in the experiment of first-order RC circuit.For the problems found in the process of experimental teaching,we adopted the problem-based guiding teaching method to guide students to conduct theoretical analysis on the abnormal charge and discharge process of capacitor.It is also proved that the abnormal charge and discharge waveform of capacitor is indeed caused by the non-simultaneous action of two switches.At the same time,we used Simulink to simulate and verify the non-simultaneous action process of the switch.The simulation results ware consistent with the theoretical analysis.Finally,we use hardware anti-jitter circuit to eliminate the step jitter in the capacitor charging waveform.The practice results show that the reformed first-order RC circuit experiment is helpful for students to master the switching process of first-order RC circuit and the use of oscilloscope.Meanwhile,the teaching effect is perfect.