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Old 09-27-2012, 05:00 PM #1
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Lightbulb Can someone PLEASE check schematic

Hi, I designed this CC and CV power supply that runs of a standard 12V transformer, can someone please check that this schematic is correct. My electronics knowledge is not very good and when I tried comparing it to Wolfman's power supply I couldn't open the schematic.SC1 and SC2 are an digital volt- and ammeter. Any suggestions would be greatly appreciated!



EDIT: I can change the LM338 to a LM317 but prefer not to as the LM338 can handle higher currents.


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Old 09-27-2012, 08:28 PM #2
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Default Re: Can someone PLEASE check schematic

That. Is. Horrible.

It looks like somebody threw a bin of BJTs in a spider web. Sorry, but it needs to be redrawn so it's readable.

Quote:
Originally Posted by Cube777 View Post
can someone please check that this schematic is correct.
Correct for what? Probably not. What sort of performance are you shooting for? I suspect you can do it with 80% fewer parts.
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Old 09-27-2012, 08:32 PM #3
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Default Re: Can someone PLEASE check schematic

Jeez...

Yeah, what Cyparagon said.

You can make an adjustable CC-CV power supply using an LM338, and a voltage regulator after it...

That's how I made a custom battery charger.

The LM338 handles the CC aspect, then once it reaches 4.20 volts, the CV part kicks in preventing the voltage from rising any higher. It's actually pretty cool.
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Old 09-28-2012, 04:16 AM #4
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Default Re: Can someone PLEASE check schematic

Hi, I am very sorry for horrible schematic. It's goal is to switch between CC an CV and at both modes read the the voltage and current. Both modes are controlled by the potentiometer and the reason for all the transistors is so that the two regulator's output don't touch each other, making that it is not CC or CV. I will try to redraw the schematic once I get home this afternoon.
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Old 09-28-2012, 04:39 AM #5
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Default Re: Can someone PLEASE check schematic

Just put the CC regulator in series before the CV regulator. Throw all those BJTs away. The pot action won't be linear and the output can only go down to 1.25V though.
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Old 09-28-2012, 05:00 AM #6
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Default Re: Can someone PLEASE check schematic

I think I spent too much time trying to follow the traces and now my brain is leaking out of my ears.

This reminds me of a joke piece of sheet music where the "composer" purposely obfuscates it to the point of illegibility.

Personally, I got a chuckle out of how none of the BJTs are biased.

Cyparagon and Le Quack are right; it takes TWO ICs (and their decoupling/filter caps, and control pots), that is ALL. A CC stage feeds a CV stage; the CV stage cannot draw more current than the CC stage supplies, and the CV stage adjusts the voltage supplied to the load.

Edit: found the sheet music:
http://imageshack.us/a/img31/7641/faeriesaire.gif
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Old 09-28-2012, 05:37 AM #7
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Default Re: Can someone PLEASE check schematic

oh my god

I am sure noone will ever be able to help you with that schematic

look throughout the internet (gooogle) there are plenty of CC/CV schematics that might work better than this (if this works at all)
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Old 09-28-2012, 08:22 AM #8
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Default Re: Can someone PLEASE check schematic

Thank you for all the replies, I tend to over-complicate things. Will put the CC in front of the CV.
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Old 09-28-2012, 10:12 AM #9
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Default Re: Can someone PLEASE check schematic

Wait, the OP wasn't a troll?!
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Old 09-28-2012, 02:10 PM #10
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Default Re: Can someone PLEASE check schematic

I am not a troll, I simply asked a question!
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Old 09-29-2012, 05:30 PM #11
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Default Re: Can someone PLEASE check schematic

Don't be too offended :P

Some people on the forums tend to be skeptical of new people. But yeah, CC then CV and you have your awesome power supply. Not CV then CC.
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