Capacitor charge and discharge

Hey!

I have a mission to do a simulation on load and uncharging of an RC circuit. I have already created a VI on the search for the value of Vc (voltage of the capacitor) by the formula Vc = V * (1-e ^(-t/R*C)). I put that in a while loop and I wanted to get a graph of the wave, but I don't get a simulation of the curve when I press the stop button. I also want to create a loop of the case, with a Boolean switch so that I can do both: charging and uncharging, but I don't know how to do the part uncharging :/ I want to add that I am new to Labview, it been 3 days I started to watch the tutorials.

Thank yyou in advance

Salvation; I suggest that you take some labview base classes that might be useful to address these issues.

For the probelem that you submitted, you must keep in mind that for the chart values of charge/discharge, tou must use time as a variable within your formula.

Duration starts from zero and lights.

So when the loop is running, you must calculate the iteration delay and put it (in seconds) inside your formula to extract the output Vc value at that time here.

Remebmer to ALWAYS put a delay fixed (0.005 s in the case) inside the loops of your time to give time to the CPU.

You can use waveform cards to update your graph of output at each iteration.

In this example, the x axis is the number of the point. Each nr point refers to a range of sampling time 0.005 s.

The output waveform chart nr 2 uses a node of formula, which is more convenient to calculate the result and gives the same results.

Waveform graph (the exit out of the loop), gives you the exact moment correlation and it is available after the BREAK.

You can evaluate the first moments of ms by using the zoom graphic tools.

Now, you might be able to do it yourself the vi discharge, this could be a useful exercise.

Kudos are recognized!

Bye,.

Marco

Tags: NI Software

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