Electronics > Projects, Designs, and Technical Stuff
Why isn't there many soldering station that uses a switch-mode converter?
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Nusa:

--- Quote from: coppercone2 on December 19, 2018, 01:41:21 pm ---I am pretty sure the art of electronics or some other book had a nice circuit for protecting transformers from this.

--- End quote ---

First have a fuse on the AC line. Pick a fuse value that will never blow in normal operation, but not needlessly large. This is just basic safety, even if there's a loophole in regulations.

For over-voltage protection: add an appropriate varistor between line and neutral, after the fuse. The varistor will conduct when its voltage spec is exceeded causing the fuse to pop very quickly. Transformer survives.
technix:

--- Quote from: LapTop006 on December 19, 2018, 12:25:18 pm ---
--- Quote from: Nusa on December 18, 2018, 06:29:05 am ---Dave is something of a special case. Most of us don't have to worry much about having ~120V hardware lying around to accidentally plug into ~240V power. Especially those of us that live in ~120V areas, as the reverse case isn't very dramatic.

--- End quote ---

It's more common than you might think, I work with a bunch of deployment engineers who are always travelling to various datacenters, even in 110v parts of the world it's not uncommon to only have >200v power easily available (sometimes 208, but usually 220-250v).

--- End quote ---
Let’s not mention Japan... They have both 120V and 240V systems within the same country. From Nagoya to Fukushima the mains suddenly runs on a different voltage.
LapTop006:

--- Quote from: blueskull on December 19, 2018, 06:51:33 pm ---
--- Quote from: technix on December 19, 2018, 05:58:58 pm ---
--- Quote from: LapTop006 on December 19, 2018, 12:25:18 pm ---
--- Quote from: Nusa on December 18, 2018, 06:29:05 am ---Dave is something of a special case. Most of us don't have to worry much about having ~120V hardware lying around to accidentally plug into ~240V power. Especially those of us that live in ~120V areas, as the reverse case isn't very dramatic.

--- End quote ---

It's more common than you might think, I work with a bunch of deployment engineers who are always travelling to various datacenters, even in 110v parts of the world it's not uncommon to only have >200v power easily available (sometimes 208, but usually 220-250v).

--- End quote ---
Let’s not mention Japan... They have both 120V and 240V systems within the same country. From Nagoya to Fukushima the mains suddenly runs on a different voltage.

--- End quote ---

Frequency changes. Voltage remains. It's always 100V, with split phase 200V.

--- End quote ---

Funny you should mention that.

Japan was one of the places where we had a DC that couldn't do standard voltage.

This got extra funny when a telco didn't have any demarc boxes that would work off 208.

Even sillier, that telco was the owner of the DC...
Berni:

--- Quote from: blueskull on December 19, 2018, 06:51:33 pm ---
--- Quote from: technix on December 19, 2018, 05:58:58 pm ---
--- Quote from: LapTop006 on December 19, 2018, 12:25:18 pm ---
--- Quote from: Nusa on December 18, 2018, 06:29:05 am ---Dave is something of a special case. Most of us don't have to worry much about having ~120V hardware lying around to accidentally plug into ~240V power. Especially those of us that live in ~120V areas, as the reverse case isn't very dramatic.

--- End quote ---

It's more common than you might think, I work with a bunch of deployment engineers who are always travelling to various datacenters, even in 110v parts of the world it's not uncommon to only have >200v power easily available (sometimes 208, but usually 220-250v).

--- End quote ---
Let’s not mention Japan... They have both 120V and 240V systems within the same country. From Nagoya to Fukushima the mains suddenly runs on a different voltage.

--- End quote ---

Frequency changes. Voltage remains. It's always 100V, with split phase 200V.

--- End quote ---

Japan has both 50 Hz and 60 Hz ? Why in the world would they do that.
diyaudio:
Interestingly the advantage of a EI core vs a switch mode power supply.

Bad.

- A decent SMPS is expensive.
- The base of the station will be to flimsy on the desk. The EI core acts as a damper weight.
- Take into account this thing will be used on expensive circuits   

A transformer is just cheaper overall, for the function and purpose.
 

I think better innovation needs to be applied to solder-station cord quality, ergonomics of the head and iron tip aesthetically and functionally.
   
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