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Why isn't there many soldering station that uses a switch-mode converter?
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technix:

--- Quote from: mikeselectricstuff on December 18, 2018, 11:02:22 am ---There was a Youtube comment that suggested that AC is preferable for high temp heating as migration within the element was an issue.
I have no idea how plausible that is at soldering temperatures - any metallurgists here ?

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--- Quote from: coppercone2 on December 18, 2018, 11:04:28 am ---Well I read literature for kilns and they have migration problems at high currents with DC because the fields cause the wires to bend

I actually wonder if it would be annoying and pick up parts. Maybe its a bad idea. The plating is iron.

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Switch-mode converters can implement H-bridge output, hence still outputting AC power.


--- Quote from: Shock on December 18, 2018, 08:45:08 am ---I'll take an iron transformer any day. The downside is extra cost for decent transformers, everything else is a benefit - weight, esd/operator safety, reliability, longevity.


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Iron transformer and a quality SMPS costs about the same here in China.
coppercone2:
thats nasty HF emi from the square waves at significant power levels near components coupled by iron.
Benta:
It's simply nice to have a heavy base that doesn't skitter all over your workbench. That's reason enough for me to prefer an old fashioned transformer.
coppercone2:
you can add a steel plate to it to weigh it down, or you use a nice steel chassis.
Zero999:

--- Quote from: coppercone2 on December 18, 2018, 11:02:10 am ---yea but if the earth pin gets loose or something its probably going to much worse then a conventional supply because of the high frequencies being used

i kinda want filtered DC there I don't give a shit about the cost

magnetic field

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I would have thought that a soldering iron with an SMPS would also be DC, but it could be HF AC if they cheaped out and used a halogen lamp style transformer based supply.

There are greater risks associated with a poor earth connection, especially if the PSU chassis is metal. EMC would be the least of my worries.
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