MeanWell specifies almost all their AC supplies also for DC powering, typically 130-370vdc for a 90-264vac unit.
I have many supplies for rack mount servers, several are wide input, 12v output AND have a trim input pin that allows the voltage to be trimmed up to the overvoltage threshold. Besides trim input, they also have a standby/on input and a 12v standby output that delivers a small standby current from a separate little flyback converter. Cor. On Mon, Nov 11, 2019, 10:07 AM John Lussmyer via EV <ev@lists.evdl.org> wrote: > On Mon Nov 11 09:47:56 PST 2019 ev@lists.evdl.org said: > >cor.vandewa...@gmail.com said: > >>> You do not really have a ground fault, it seems your power supplies > have an > >>> input circuit that causes a small current to ground > > > >John, are these built as DC/DC converters? Or are the AC-input power > >supplies that you are using with a DC input? > > AC Power supplies > > >AC power supplies usually have noise filter caps, and resistors to > >discharge these capacitors when unplugged to satisfy UL requirements. > >It's common to find capacitors from hot and neutral to ground, and a > >high-value resistor or two to ground to discharge them. > > One has a ground, which isn't connected, and the case is on a plastic > board. > > >If the supply has no ground pin (2-wire cord or wall-wart), then there > >will be a capacitor and resistor from the AC input side to the output > >side, in the hopes that the output negative side "might" be grounded. > > The other is 2 wire only - but it a potted unit, no way to get inside. > > So, it sounds like I need to find a real DC-DC converter that can take > 330vdc and make 13.8vdc. > Pretty much the opposite of every unit I've ever seen. > > > -- > > Bobcats and Cougars, oh my! http://john.casadelgato.com/Pets > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20191111/c76cb791/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
