Electronics > Projects, Designs, and Technical Stuff
Non-linear CV/CC control in schematic
Silver_Pharaoh:
--- Quote from: xavier60 on March 03, 2019, 10:58:42 pm ---I drew this up quickly. Ill check for possible mistakes later.
The values aren't supper critical.
--- End quote ---
Thank you. :)
I was hooking the pot up wrong.. everything else was correct.
I'm sorry you guys have to dumb things down sometimes. I appreciate it though :)
Circuit has been modified and seems to function well. I adjusted the voltage divider and adjusted R1 slightly to get a bit smoother voltage control.
Vdroop under a 12A load is about 0.1V. There's not a lot I can do about that eh? Something to do with VRef or current sense maybe?
xavier60:
Good to see things work.
What is the minimum regulation voltage?
The lowest loaded output voltage while still being controllable with the voltage adj Pot.
xavier60:
The cause of the voltage droop should be traceable by looking for voltage changes while loading and unloading the output.
Such as, Vref, Ninv, Inv and the top of R20, all WRT pin7 -V.
Silver_Pharaoh:
--- Quote from: xavier60 on March 04, 2019, 01:03:50 am ---The cause of the voltage droop should be traceable by looking for voltage changes while loading and unloading the output.
Such as, Vref, Ninv, Inv and the top of R20, all WRT pin7 -V.
--- End quote ---
Seems Pin 2 and Pin 10 have large Voltage fluxuations:
Pin 2:
12A load: 5.575V
Low load: 5.109V
Pin 10:
12A load: 7.05V
Low load: 5.80V
I have not had nay luck much in modifying the circuit.
The Vdroop gets worse after I pull 11A from the circuit. Below 11A the Vdroop is very minimal.
At 11A, Vdroop is 0.02V and gets worse the more I pull after that. At 11.5A Vdrop is 0.05V...
Could is be the balancing resistors?
xavier60:
--- Quote from: Silver_Pharaoh on March 05, 2019, 01:37:35 am ---
--- Quote from: xavier60 on March 04, 2019, 01:03:50 am ---The cause of the voltage droop should be traceable by looking for voltage changes while loading and unloading the output.
Such as, Vref, Ninv, Inv and the top of R20, all WRT pin7 -V.
--- End quote ---
Seems Pin 2 and Pin 10 have large Voltage fluxuations:
Pin 2:
12A load: 5.575V
Low load: 5.109V
Pin 10:
12A load: 7.05V
Low load: 5.80V
I have not had nay luck much in modifying the circuit.
The Vdroop gets worse after I pull 11A from the circuit. Below 11A the Vdroop is very minimal.
At 11A, Vdroop is 0.02V and gets worse the more I pull after that. At 11.5A Vdrop is 0.05V...
Could is be the balancing resistors?
--- End quote ---
The change at pin 10 is expected as the output transistors need more drive with increased load .
The change at pin 2 is very close to causing the CL transistor to conduct especially if the LM723 is warm.
I would be curious to know how much drive current pin 10 is having to source. This can be done by inserting a 10Ω series resistor and measuring its voltage drop.
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