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Forum Index : Electronics : AC-to-DC Switched Mode Supply Question

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Bowden_P
Senior Member

Joined: 20/03/2019
Location: United Kingdom
Posts: 173

Posted: 09:11pm 07 Apr 2026

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Hi,
I am ideally looking for a SMPSU that is able to be adjusted over the o/p range 10V to 24V at about 80A, with an i/p of 240V, 50Hz.

The adjustable ones I've found so far have a much more limited o/p range, and I would have to buy at least 2 to cover this o/p range, or are somewhat expensive.

My absolute minimum requirement is 11.1V and 21.5V at 80A, and 2 x 12V units with about a +/-10% adjustment could do this - IF they could be connected in series for the 21.5V o/p, or used singly for the 11.1V spec.

Is there a special requirement of a supply to enable a series connection like this,
or would any SMPSU be capable.

With best regards, Paul.

Nothing so constant as change.

phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 3116

Posted: 09:38pm 07 Apr 2026

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As long as the outputs are floating it will work.
Some DIN rail units intended for use in switchboards have the negative terminal tied to mains earth internally.

Chopperp

Guru

Joined: 03/01/2018
Location: Australia
Posts: 1123

Posted: 10:54am 08 Apr 2026

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@Bowden_P. About 6 years ago, I connected two oldish HP 12V, 60A SMPS units together hoping to get 24V (Obviously). Unfortunately, they didn't last. Stopped working. The outputs were isolated.

I suspect that they probably each needed their own residual load, maybe an amp or two and I should have made sure that the load was switched on after both units had been powered up & settled down.

BTW, I went out into my shed to look for them to see what they were (I don't tend to chuck things out) & in the process found some large 12V C/O contactors I'd been wondering where they had been safely put. So thanks for the question.

Brian

ChopperP

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