Multisim and Ultiboard

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discharging capacitance in a equivalent circuit for a diode

Hi guys, great website and thanks for always being available

 

I have a slightly advanced problem that I'm looking for a hand with.I'm working with multisim as a researcher and I'm interested in simulating the discharging of a parasitic capacitor through a diode equivalent under a triangular input input: a +ve to -ve sweep, capacitor is charged according to it's RC and polarised and the reverse -ve to +ve sweep (polarised capacitor is discharging, charge migrates through circuit via path of least resistance, this current should be detectable via a current probe and once discharged polarises in the opposing polarity, potentially a different RC for this regime).

 

 

I have attached the simulation I am working with but no discharge is observable through this circuit- i would expect a non-zero current

 

Could somebody poke me in the right direction in being able to observe/simulate/monitor this dischage?

 

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DannyClash,

 

Is this what you are looking for?   I am using the Oscilloscope to visualize the waveforms and I adjusted the C value and the time scale to show the simulation.   You had a frequency selected in the mHz (milliHertz) range - don't know if this was intentional, but you would have waited a long time to see the behavior.

 


- Pat Noonan

National Instruments

 

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