Capacitor conduction possible bug

111

02:31:03

This circut should start with LED On then dim until compleatly go off. Capacitor capacitance can be set to few F and still not working, reseting simulation still give no result. Device work only when capacitance is changed during simulation. Is this a bug ? Almost the same circuit in real, work perfectly.

published 11 years ago

M3RL1N

11 years ago

Change resistor to 300 ohm and capasitor to 30mH and you will see the led dimm .....uncharge cap over resistor or reset circuit .....once again please :)

Retro

11 years ago

The circuit has reached a steady state condition. So when it is loaded the capacitor is already charged. Try shorting the capacitor with a switch.

sebeksd

11 years ago

Yes, adding a short to discharge capacitor work (strange I was sure that I test it this way too... sorry) but still when circuit simulation start from begin (e.g reset simulation or clean start) capacitor is already charged and must be discharged, so still something wrong

M3RL1N

11 years ago

Change res to 300 ohm and cap to 30mF ...add a switch over the cap to unload ..and led will dimm to turn off

ZyanWu

11 years ago

EC starts by calculating the DC operating point and sets initial conditions of caps, inductors to these values, instead of 0 (discharged). Just like in real life, if you "start the simulation" and then connect the source, someting happens. If the source was connected over night and you "start the simulation" at 7 AM, nothing happens.

ZyanWu

11 years ago

Add a switch between the source and 80Ohm resistor. Turn it off before starting the simulation and on when the simulation is running. Also, set the time base (~sampling period) to 10ms.

sebeksd

11 years ago

Thanks ZyanWu, "EC starts by calculating the ..." this is what I wanted to know :)

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