| Electronics > Projects, Designs, and Technical Stuff |
| Lab Power Supply - The Lost Current |
| << < (25/26) > >> |
| radoczi94:
Do you see any kind of crippling factor other than the probably slow opamps? I plan to solder in sockets for the opamp compensation caps, this way, I can start experimenting with other opamps to make the control system faster. I'm a little bit afraid of the voltage drop across the series output diode, but don't know if it's a big problem, or should I ground the control supply after the diode. |
| xavier60:
Stability is difficult to predict. Tweaking the compensation capacitors should fix it if necessary. Shifting ground to the other side of the diode will put the diode inside of the CC loop and cause problems. What is D9(1-2) for? |
| radoczi94:
I put that dual diode in for protection purposes. In case of somebody leave a battery or cap on the output when switching off the power supply, or connects the battery backwards. The power supply will have better chances of surviving this way, I think. Just had some leftover TO220 diodes lying around in the drawer, tought, I could use them for protection. |
| xavier60:
D9(1-2) won't protect for reverse polarity. D9(2-3) and the fuse should protect for reverse polarity. You could parallel the 2 diodes for better current rating. I don't think that applying voltage to the output while powered down will hurt it. Ill see what it does to my bench supply tomorrow. |
| radoczi94:
Oh, I see now, what you asked. I tought, if I put the D9 1-2 diode in series on the output, it could protect the series pass transistors against if some idiot leaves a cap or battery on the output. |
| Navigation |
| Message Index |
| Next page |
| Previous page |