Adding dual-voltage to an SPS?

[DaveC]

I've got a battery charger for a power tool. Input voltage is spec'd at only
120 VAC.

Is it reasonable to think about modifying the switching p.s. to encompass 240
VAC as well? Or might one simply design an entire new one more easily (not
that I'd even consider doing that...)?

What's involved in modifying such a supply?

Thanks,
Dave

 

[Ken Taylor]

I've got a battery charger for a power tool. Input voltage is spec'd at only
120 VAC.

Is it reasonable to think about modifying the switching p.s. to encompass 240
VAC as well? Or might one simply design an entire new one more easily (not
that I'd even consider doing that...)?

What's involved in modifying such a supply?

Thanks,
Dave

Buy a stepdown transformer. Attempting to modify the existing supply is not
a reasonable proposition unless you know how to design switching supplies.

Ken

 

[Sofie]

encompass

--------- -- -----------------

 

[Sam Goldwasser]

Buy a stepdown transformer. Attempting to modify the existing supply is not
a reasonable proposition unless you know how to design switching supplies.

Only easy solution would be if it already has a doubler/bridge input
with a jumper to select 115 VAC (in) or 230 VAC (out). This would mean
the chipper runs off ~300 VDC. If it runs off of ~150 VDC, probably no easy
solution.

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[DaveC]

Only easy solution would be if it already has a doubler/bridge input
with a jumper to select 115 VAC (in) or 230 VAC (out). This would mean
the chipper runs off ~300 VDC. If it runs off of ~150 VDC, probably no easy
solution.

Sam, I always appreciate your instructional answers. In this case, it was, to
paraphrase, "Don't do it unless it's an easy mod, such as...".

I tire so of responses such as "You fool! You will die!", which may be true,
but that's my responsibility, isn't it. I want to know *why*, which you
provided.

Thanks again, Sam, for another *educated* answer.