Electronics > Projects, Designs, and Technical Stuff
Bench CC/CV PSU Based on Daves uSupply (Not Anymore)
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not1xor1:

--- Quote from: imo on March 12, 2019, 03:53:34 pm ---I get almost identical results with LM324. Of course, it is a simulation only..

--- End quote ---

here is a simpler design which should also work with LM358/LM324
https://www.eevblog.com/forum/beginners/lm324-power-supply-with-variable-voltage-and-current/msg2255262/#msg2255262

BTW it would be better to use 20k/100k resistors for the current control.
Those should be 0.1% or selected 1% resistors with a 100 ohm multiturn trimmer for balancing and cancelling the quiescent current.
I've simulated more complete circuits, I'm not posting other images/asc files for lack of time.
I may do that later if anybody is interested.
jaycee:

--- Quote from: not1xor1 on March 13, 2019, 08:43:49 am ---here is a simpler design which should also work with LM358/LM324

--- End quote ---

It's pretty much the same as what I proposed, but instead of having separate sense and error amps, the sense/error function is combined.
This will indeed work pretty nicely, but one of the good things about having separate sense amps is that you have appropriate signals for feeding to ADC's for display.
not1xor1:

--- Quote from: jaycee on March 13, 2019, 06:24:10 pm ---
--- Quote from: not1xor1 on March 13, 2019, 08:43:49 am ---here is a simpler design which should also work with LM358/LM324

--- End quote ---

It's pretty much the same as what I proposed, but instead of having separate sense and error amps, the sense/error function is combined.
This will indeed work pretty nicely, but one of the good things about having separate sense amps is that you have appropriate signals for feeding to ADC's for display.

--- End quote ---

Your design (with IMO contributions) works better than I expected (at least in simulations) although a bit slower than other solutions.
As soon as I've some spare time I'll make more tests in order to compare the (just simulated) performances of various solutions including the floating (HP/Harrison's) design.
iMo:
I've been playing with both versions a bit. Added FastCC (see a different Mike_Mike's PSU thread on that).
As an example here is the response to a "short" (from 20V) for jaycee's and not1xor1's version with identical params in compensation, parts, settings and load, LT1022A used.
Measured at the 0.33ohm 3055 emitter resistor (FastCC).

Added V(out) dropping from 20V.

Added "shorting" into 10mH, measured at the Shunt resistor.
jaycee:
imo, how are you doing these tests? can i see the LTSPICE file please ? :)
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