Electronics > Projects, Designs, and Technical Stuff
Non-linear CV/CC control in schematic
xavier60:
--- Quote from: Silver_Pharaoh on March 06, 2019, 01:27:45 am ---
--- Quote from: xavier60 on March 06, 2019, 01:01:54 am ---The idea is to figure out wether the CL transistor inside of the LM723 is starting to conduct or not.
The simplest way is to apply a load that just starts to make the output voltage drop then make a small adjustment to the current limit Pot to see if it affects the output voltage.
Measuring the voltage between pins 2 and 3 would be useful.
--- End quote ---
Ahh I see.
Can't tinker much tonight, but I think you are correct in saying the CL transistor is starting to conduct.
It's hard to tell because I don't have fine control with the current adjust and the voltage drops near full load, so the current adjust pot is already maxed out..
I reduced the balancing resistors to 0.8 \$\Omega\$ each and the voltage shot back up to 5.1V like I have it set. This pulling 12A at the output.
Are the balancing resistors limiting max output current too much?
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To increase the max current setting, just put a resistor from the junction of the 100Ω summing resistors to the junction of the sharing resistors(power supply's output). Start with 100Ω.
xavier60:
--- Quote from: diane on March 06, 2019, 01:51:58 am ---Wow, such a difference in if of possibility. I only did a patent on the idea, but if there is a possibility of creating without too much grevience, I will recommend that person's idea. Of course it may take another patent for idea. Read articals. About the building of assisted living quarters. 4 New ones were just finished within 5 to 10 miles of my area. They are filled and with waiting lists. Thank you for your help.
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Is this the thread that you meant to post in?
xavier60:
I would rather see R14 placed between B and E of Q1. Then R15 should be something lower in resistance.
The low end of the current range will have a lot of thermal drift.
Silver_Pharaoh:
--- Quote from: xavier60 on March 06, 2019, 08:51:38 am ---I would rather see R14 placed between B and E of Q1. Then R15 should be something lower in resistance.
The low end of the current range will have a lot of thermal drift.
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Isn't that where R14 currently is?
I've added in the 100 \$\Omega\$ resistor. Having it around 0.5 \$\Omega\$ gets be a Vdrop of a mere 0.01V which is sweet! Short circuit is around 14A
That resistor has the same effect as lowing all the balancing resistors to 0.08 \$\Omega\$
It is better to lower this new resistor instead of the balancing resistors isn't it? I imagine finding 0.08 \$\Omega\$ resistors might be pricey/hard. I haven't checked yet.
xavier60:
That looks right except for R11 which is label as "1" but must really be 100Ω because 1Ω would result in a very high maximum setting like 100A!
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