| Electronics > Repair |
| Korad KA3005P power supply faulty/repair |
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| uv3afl:
--- Quote from: Ton on January 04, 2017, 06:40:42 am ---this "feature" is also seen on some cheap Chinese PID controllers, the speculation is that it gives the user a feeling of greater precision than the device actually gives. :rant: --- End quote --- One more question if you please - why? :palm: How does it work for getting the illusion of higher precision in this case? :wtf: I don't believe in flicker or noise Andreas tells about, as it will be also 'noisy' and flashing in say CV mode and also 'noisy' being far from voltage limit in CC mode... And if they care about CC/CV - 'noisy' mode switches, they will have it independently of displayed value , isn't it so? |
| Ton:
Hi uv3afl I guess that the theory, if you can call it that. Are that for a user with a pid controller set to keep for example a temperature at say 30 degC it will look more stable if it always show 30.0 degC than if it is sliding between 29.9 to 30.1 - it is all about the perceived stability. I should probably have used stability in my first post instead of precision. if you know stuff regarding process control, you are expecting some sliding around, not a static number. Or your process is very stable with very small noise input. The task to minimise the sliding around is sometimes a quite challenging one if your plant is not simple. Br Ton |
| tombi:
Hello, With the overshoot problem, I wonder if putting a small cap in parallel with D1 might help here? I've seen some Agilent schematics that do this. Tom |
| Andreas:
What is D1? if you mean the output: how much compared to the already used 330uF across the output? Normally you would use a feedback capacitor across the voltage/current regulator. But adjustment is critical: if too large the load regulation suffers. If too small you get overshoots. And the largest issue gives a change from voltage <-> current mode. with best regards Andreas |
| mos6502:
--- Quote from: Andreas on January 08, 2017, 10:01:34 pm ---the already used 330uF across the output? --- End quote --- Are you saying this PSU has 330uF across the output? That's total junk ... :-- |
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