Electronics > Beginners

Mini TS100 soldering iron and current leakage

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bodger:

--- Quote from: Simon on June 25, 2017, 07:15:33 pm ---Is the SMPS earthed ? this sounds very much like a lack of earth connection. many SMPS will have an input filter that puts two capacitors in series across the mains with the centre ping earthed, if there is no earth there will the 1/2 the mains supply voltage there, if the iron is then "earthed" you will have a problem.

--- End quote ---

No it isn't earthed, but my old Dell laptop power supply which is earthed has a similar effect. Having done a little more research it looks like this is an effect of the Y-caps, which are pretty much required in SMPSs to pass EMI radiation tests.

Simon:
Yes I was referring to the Y caps, if you have other equipment doing this it means you don't have an earth in your house.

bodger:

--- Quote from: Simon on June 25, 2017, 07:38:29 pm ---Yes I was referring to the Y caps, if you have other equipment doing this it means you don't have an earth in your house.

--- End quote ---

I made an assumption about the Dell power supply as most of the new ones I have are grounded, the one I tested wasn't grounded plus it had what appeared to be a clover socket, turned out to be a unnecessarily large figure 8 socket. Make sense that my newer laptop power supplies don't exhibit the same problem. Thanks.

wraper:

--- Quote from: bodger on June 25, 2017, 07:36:45 pm ---No it isn't earthed, but my old Dell laptop power supply which is earthed has a similar effect. Having done a little more research it looks like this is an effect of the Y-caps, which are pretty much required in SMPSs to pass EMI radiation tests.

--- End quote ---
Means that there was no earth connected in your mains sockets.

KL27x:
I feel like the dunce in the corner for asking this. But if there's no earth connection for the iron... or if there is an earth connection but it isn't plugged into anything, then how does the 115V potential get to the tip of the iron? Is not the tip electrically isolated from the heating element in every soldering iron?

I built an iron ran from ungrounded laptop supply, and I had zero issues. The earth pin for the handpiece, I just left unconnected.

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