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How to adjust for mains voltage 110V<->240V automatically?

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martin1454:
Hi there!

A fellow friend have given me a challenge.

Is it possible to drive a 2KW heating unit from either 110V/115VAC or 220/230VAC without setting anything on the equipment (like those small switches we often see at a power supply). His heating unit will consist of multiple small heating cartridges (somewhere between 50 and 100W)

So far I have 3 possible solutions for him.

Option 1:
Use a few relays to switch between running 2 cartdriges parallel and seriel (eg, having 110V heating cartridges that will run parallel or set 2 of them in series if running 240V)

Option 2:
Using a PFC to change it all to 380V/400V DC and run it off that. (But I cant seem to find a reasonable price PFC for 2KW)

Option 3:
Some kind of magical transformer I dont know of yet that will transform 110V to 230V and 230V to 230V without adjustment (I dont belive there is?)

Is there other / Better options you use for changing between the mains voltages? Since its a pure resistiv load, the inductance should not be an issue.

And no, I can not just run the 240V through a diode to cut off half the voltage!

tunk:
I don't really have a clue, but for the first option I would
think you need some logic/electronics to check voltage
and then switch the relays.

MosherIV:
Combination of 1 & 2.
Use smps to convert to fixed dc voltage to run the heaters.
Most smps can cope with either 110V or 240V.

2KW smps is not going to be cheap though.

martin1454:

--- Quote from: tunk on September 07, 2020, 11:34:36 am ---I don't really have a clue, but for the first option I would
think you need some logic/electronics to check voltage
and then switch the relays.

--- End quote ---

Naturally - Either a AC->DC and scale down the voltage to something a uC can read, or a simple analog circuit that flips the relays.

martin1454:
I got close -

TDK PF-1000A-360 looks good! I'll see if 1500W is enough, otherwise I have to go up in price.

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