Electronics > Beginners

OVP

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tony3d:
Can someone explain to me what Over Voltage Protection is suppose to do on a power supply? I thought you set the voltage, press the button, then if the voltage goes above the setting it shuts down the outputs. Can't seem to get mine to do that. The OCP works as you would expect..

alm:
OVP can protect against two types of faults: an absent-minded person accidentally changing controls (think turning the button on the wrong power supply while it's connected to an expensive FPGA) or a fault inside the power supply. To protect against the latter, some power supplies feature a crowbar circuit that will short the outputs if the voltage exceeds the set threshold. This can even protect against a shorted pass transistor. In other cases it's just a software limit, this only prevents wrong control settings.

tony3d:
Well I can't seem to get to work with wrong control settings. So I guess it's just for internal faults. SRA Solder doesn't seem to have a clue how it works either. I tried emailing Korad, but no reply. Oh well everything else seems to work fine. Bugs me though that there is a feature that seems to do nothing.

Dave:

--- Quote from: alm on October 02, 2013, 11:54:51 pm ---OVP can protect against two types of faults: an absent-minded person accidentally changing controls (think turning the button on the wrong power supply while it's connected to an expensive FPGA) or a fault inside the power supply.

--- End quote ---
There is always the third option: A very impolite load that causes the power supply to oscillate, so the voltage exceeds the OVP limit.

geraldjhg:
shut it down
not easy to trip if done with the same power supply

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