Electronics > Beginners
Confused with about my new Lab/Bench PSU C.C. & C.V. Is it working correctly?
mikerj:
--- Quote from: piguy101 on August 10, 2018, 11:47:53 pm ---I have used this power supply in a lab before and I am not a fan of it. With the CC option off, the power supply outputs a constant voltage until it reaches the maximum current it can supply, just over 5 A. With the CC option on, the supply works as a typical CC/CV supply, but the buttons are used to set the current limit in steps of about 40 mA per press of the button. Of course, you have to short the output to see what the current limit is. :palm:
--- End quote ---
I agree, that sounds like a pretty terrible feature and ultimately pointless. Effectively CV mode is the same as CC mode with the current limit set to maximum.
james_s:
It's kind of pointless to even have two separate modes. Makes more sense to just have a current limit knob and keep it turned up all the way if you want something as close to CV as possible.
castingflame:
I really appreciate all your answers so thanks.
However, you all completely missed my comments "If I hit the button to switch between C.C. and C.V. The display does not change (Still displays C.V.) and the current is not constant. I can not change the current via the CUR ADJ buttons either"
I understood that C.C. is a limit but if I can not change any setting to set anything in C.C. mode and the CV does not change to C.C. mode , I would have to disagree and still think the unit is faulty. Is this still wrong?
Cheers
IanB:
You cannot hit a button "to switch between CV mode and CC mode". The power supply will decide that for itself depending on the load. It is not something a button can change.
The button you are describing apparently switches between having an adjustable current limit and having no adjustable current limit. Others in this thread have suggested this is a pretty useless button.
If you want to see your power supply enter CC mode, then first you have to set a low current limit, and secondly you need to increase the load until it tries draw more current than the limit. If you do that then the supply will start limiting the current and the CC indicator will light.
eblc1388:
On my Roband power supply, the output On/Off toggle switch is actually a three position center-off switch.
One position is output ON. On the other position it places a short circuit across the power supply outputs internally and enable user to adjust the current limit setting.
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