Newbie- Can I fuse a DC power supply?

[Brenck]

Hi all,

I want to know can I fuse a DC power supply? After the rectifier and capacitors?

It would be like... Transformer-rectifier-capacitors-fuse...

Or maybe Transformer-rectifier-fuse-capacitors...

Do I just use regular fuses? Or is there a DC kind of fuse?

[jeffery71]

Yes you can and should fuse the dc power supply


Transformer- Rectifier- Capacetors- Fuse

The fuse should be on the + wire

You can use the regular glass tube type fuses..
It should be a fast blow type.



Jeff T.

http://www.3dcarvestudio.com

[Al_The_Man]

The common way is in the AC side of the bridge.
Al.

[Crevice Reamer]

See page 10:

http://geckodrive.com/upload/Step_motor_basics.pdf

CR.

[jeffery71]

Originally Posted by Al_The_Man The common way is in the AC side of the bridge. Al.

I'm not an expert thats for sure. But the idea of using a fuse is to protect the drive/motor. If you are using more than 1 drive/motor from the same power supply I can't see how having 1 fuse on the ac side of the rectifier is going to proctect the drive's/motor's

Putting a fuse for each drive/motor on the dc side you protect each Drive/motor with its own properly sized fuse.


Jeff T.

http://www.3dcarvestudio.com

[Brenck]

Its actually for a 12VDC power supply for the logic of a stepper drive, the problem is that this 12vdc 3.5A I have it one of those that you buy it already built and the transformer inside there is no way to connect any wire before the diodes...

I always used on the AC side and it actually protects your driver, I had a short circuit on the driver 2 times, one when I was adjusting the trimpot on the L297 based driver and the other one I dunno what happened but the fuse blow and after I change it nothing was damaged.

Is it just a regular fuse to use when using on DC?

[jeffery71]

Just the regular glass cyclinder type fuses work fine http://www.allelectronics.com/make-a...5/Fuses/1.html

Should have a fuse for each drive... Sence its only a 3.5 amp supply I'm guessing your only using it to power 1 drive so doesn't matter were you put the fuse. But if you were trying to power more than 1 drive it should be 1 fuse for each drive and would need to be on the dc side of things after the capaciter.


Jeff T.

http://www.3dcarvestudio.com

[Brenck]

Thank you all for the replies.

I used those glass fuses it worked fine