| Electronics > Projects, Designs, and Technical Stuff |
| Oscillation in PSU simulation |
| (1/7) > >> |
| ElectronSurf:
Hi, I'm a hobbyist and trying to "design" a lab PSU; I tried adding RC filter between inverting and output of both op amp with different values (trial and error) but haven't had any luck getting it to not oscillating, before giving up thought maybe you guys can point me at right direction. Connecting the inverting input of the op amp (voltage feedback) directly to the output stops the oscillation but still oscillates in CC mode, but connecting it to the differential op amp which measures the voltage causes oscillation both in CC and CV mode. Is it a bug in the simulator? how can I stabilize the output? Link to the simulator: http://tinyurl.com/yancfgls |
| xavier60:
Just a capacitor between output and inverting input of the CV op-amp should work. 10nF should be overkill. Then reduce it. Maybe the same for the CC side. |
| ElectronSurf:
You can click on the simulator link and try it yourself, it doesn't fix it... |
| xavier60:
A resistor is needed in series with the inverting input of the CC op-amp for a compensating capacitor to be effective. I was seeing large amounts of noise on the scope. It cleared up after I removed and added the scope again. |
| ElectronSurf:
When you reset the scope you have to right click on the scope and choose "max scale" to be able to see the noise, the oscillation is still there. |
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