Victor ! Thanks a lot for your comments. I struggled for a whole day to post this blog. I tried to insert the files. For each file, message was: file above 2.0 MB cannot be inserted. though the file size is less than 100 KB. So I attached these files and thought none will open these and there is no point to put any explanation.
The file gives the simulated results in TINA-TI distributed freely by Texas Instruments. Simulation is for differentiator and integrator configuration of op-amp. These two blocks are needed for PID (Proportional-Integral-Differential) in hardware. The input signal is proportional to the temperature difference = Set-point temperature - Sensed temperature obtained from an analog comparator. Set-point temperature is set by the user with a potentiometer knob. The outputs are fed to a summing amplifier and then to MOSFET control. The MOSFET is in series with the heating coil.
To design the configurations: R and C values, supply time period etc. periodic waveform was applied as shown in the bottom of the figure.
First two figures are for differentiator. As expected, the first one is giving the desired result the second one not. The RC time constant should be large enough as compared to signal variation so that capacitor remains in transient state as shown in the 1st figure, The 3rd one is giving the desired result for integrator with large RC.
Hello Mala, can you put some explanation in this post? I know it links to the previous one, but it would be nice to hear you explain what signals we're seeing and whether they show us good behaviour or not...
