Electronics > Beginners
24v transformer question
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shanezampire:
This is just a curiosity question. I have the below transformer. I originally thought it was a 120v transformer and hooked it up to 120v. I was only getting half the 24v out. Actually around 14v give or take. I cant remember. Which is actually what I really needed and wanted in the first place. Question is, can it be hooked up and ran that way without harm or over heating?


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cur8xgo:
Looks like its rated for about 20W output or 20W / 24V = 830mA . Don't draw more than that and you should be fine.

If it were the other way around and it was a 120V transformer and you wanted to drive it at 240V, that would almost certainly be a problem as the flux would rise twice as fast and almost definitely push the primary inductance well into saturation, drawing alot of current and overheating (or worse) from I^2 R losses in the primary winding.


bob91343:
It's marked as being a 240V primary.  You can run it at half that and expect half voltage output but the same current.  So its power rating is proportionately lower.  That's because the wire size determines the maximum current.

Having said that, the practical aspect is that you can draw a bit more than half rating due to other losses being lower.  I would limit the load to around 60% of rated power, or perhaps 20% more than rated current.  That would make it top out at around 1 Ampere load current.

If you try to get that out of it, be sensitive to its temperature rise and if it seems to be cooking, reduce the load.
shanezampire:
Thanks for the replies! I hooked it to a Bridge Rectifier and hooked it to a pretty dead 12v battery for about 30 min to an hour and it was reading about 15.4v then dropped to 14.7 as the voltage started rising. Nothing got over room temperature. I was thinking of hooking it to the below (XH-M603) and setting the cut on voltage to 12.5 and cut off about 12.9 or something similar. Just as a little float charger for a battery I may have sitting for months. Just tinkering and learning.


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cur8xgo:

--- Quote from: shanezampire on June 21, 2019, 06:22:28 am ---Thanks for the replies! I hooked it to a Bridge Rectifier and hooked it to a pretty dead 12v battery for about 30 min to an hour and it was reading about 15.4v then dropped to 14.7 as the voltage started rising. Nothing got over room temperature. I was thinking of hooking it to the below (XH-M603) and setting the cut on voltage to 12.5 and cut off about 12.9 or something similar. Just as a little float charger for a battery I may have sitting for months. Just tinkering and learning.


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Nope. Don't connect unregulated power sources to batteries. How did you know how much current that battery would draw when you connected it?







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