Electronics > Projects, Designs, and Technical Stuff

Bench CC/CV PSU Based on Daves uSupply (Not Anymore)

<< < (5/29) > >>

jaycee:
The LM324 actually seems to work pretty well. The important thing is that this opamp can work near its negative rail... most opamps cannot go right down to 0v output unless they have a -ve supply.
Pretty much any small signal transistor should work in place of the 2N's...

KC0PPH:
Yeah I will see how they work out. Im not too concerned with getting down to zero for an output, although it would be nice.

Just placed an order for some parts. They will be on the slow boat from china. I ordered from Tayda and their faster shipping methods were a bit extreme on price.

jaycee:
A little update...

xavier60:
If the current regulation loop is difficult to compensate, a transconductance output stage might work better rather than the voltage follower.
I have found that change in load impedance doesn't affect the transfer function as much with a transconductance output stage while in CC mode.

Kleinstein:
The compensation for the CC mode gets easier when the shunt is a little higher in value.
Both for the CV and CC mode it help if there is some ESR with the main capacitor at the output. Just the normal ESR of an electrolytic cap already helps a lot. If the ESR in included the 100 µF should be well large enough that the load impedance should not effect the compensation of the CC mode very much.

The CC mode may have to be relatively slow (still much faster than in Daves version) and are additionally limited by the slew rate of the OP. So it may help to have an additional fast current limit (e.g. a transistor over the shunt).

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod