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| Lab Power Supply - The Lost Current |
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| C:
And this is the U8002A that has slow response to over-current. |
| xavier60:
--- Quote from: C on March 01, 2018, 07:58:12 am --- And this is the U8002A that has slow response to over-current. --- End quote --- Yes, This test was done by connecting a 0.22 ohm resistor to its output with the U8002A set to 15V 1A. There is about 0.06 ohms of lead resistance. The DSO shows over 10V being sustained across the resistor, about 45 amps. I have little doubt that this is caused by too much delay in going from CV to CC mode, likely due to the time taken for IC9's output to slew down to where it can take control of the Gate via IC8. |
| radoczi94:
It's interesting to see an actual supply during development. I didn't even knew, that high-er current opamps exist. |
| xavier60:
I have removed my posts that contained schematics because they had a serious mistake that has found its way to my PCB design. Ill post a corrected one after I get it right. |
| C:
I hope that you have found that CV circuit should match CC circuit. With a CC mode & a CV mode control is Min (current OR Voltage). With 0.1 R current sense you have 0 to 3V current sense for a load range of 0 to 3 amps. With a 0 to 3 volt voltage sense for an output of 0 to 30 volts output you have two matching control circuits. If the two circuits do not match then you start getting a voltage caused change not equal to a current caused change. With matched circuits, testing becomes a little easer. |
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