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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
hen918 wrote ...
I like your metal backbox design, I might have to do that myself. Inexpensive and it already has tapped holes for a lid...
you can cut and braze them together for the internal volume you need, like Legos you can make odd shapes too. I tapped the 6-32 fine threads out to 10-24 coarse threads.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ok getting this thread started again, ive got new components and more time.
here are some examples ive been looking at :
That cropped last one is the feedback circuit im going to closly copy. ill use the PS2561-1 opto and tl431 as DerAlbi suggested. Ive learned enough from that clumsy etched prototype that ill be moving on to a professional board house as soon as the regulating and feed back are reliably figured out.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Heres a new circuit that caught my attention.
This one uses a seperate Opto power supply than what its regulating. Thats really useful, since i want a generic circuit whos values can be modded for many power supplies i build. Many voltages from 12 to 2kV and different types switching methods.
So the error sample is now somewhat isolated and less loaded.
But im not sure what the arrangements of RC elements do.
So now in the next few days im going to build on a perf board a prototype a battery powered test circuit with a potentiometer to measure response. It will measure only DC response, but will get some of the opto values pinned down too.
I have access to really sophisticated Network analyzers if that helps later on.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Where are you getting the 12V from? if it's on your input side you'll loose all isolation, and if it's on the output, what guarantees it's at 12V? It seems like a very strange circuit when all you need to do usually to change between voltages is change a resistor value or two as part of the potential divider on the output, making the extra supply rather redundant.
If you want to know more about the RC network, have a look at TI's brilliant datasheet for the UCC28950: The application information is on page 35 onward.
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Need help with current limiting.
