Your SMPS units may not be isolating.

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

In Reply to: Can I put 5 Switching Mode PS in serial for 200V posted by wlee on December 16, 2010 at 19:43:01:

There may be a direct connection of the output negative terminal to the AC input ground, so that connecting two SMPS' in series shorts one output and burns up the unit.

You can determine this with a simple ohm-meter.

If this is the case, then you need a separate AC isolation transformer for each SMPS (except the one at the bottom of the chain, if having the negative terminal grounded is not a problem).

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Follow Ups Full Thread

Topic - Can I put 5 Switching Mode PS in serial for 200V - wlee 19:43:01 12/16/10 (5)

Your SMPS units may not be isolating. - Al Sekela 10:42:23 12/17/10 (3)

RE: Your SMPS units may not be isolating. - wlee 12:02:00 12/18/10 (2)

There are many designs. - Al Sekela 12:57:24 12/18/10 (1)

RE: There are many designs. - wlee 23:49:13 12/18/10 (0)

RE: Can I put 5 Switching Mode PS in serial for 200V - djk 20:58:07 12/16/10 (0)

Follow Ups

Your SMPS units may not be isolating. - Al Sekela 10:42:23 12/17/10 (3)

RE: Your SMPS units may not be isolating. - wlee 12:02:00 12/18/10 (2)

There are many designs. - Al Sekela 12:57:24 12/18/10 (1)

RE: There are many designs. - wlee 23:49:13 12/18/10 (0)

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