On Tuesday, September 06, 2011 10:16:17 PM andy pugh did opine: > I have made a servo PSU. It simply rectifies mains voltage to give me > 325V DC. > https://picasaweb.google.com/lh/photo/HdNJXBD5wPqDUi9E8C46HQ?feat=direc > tlink > https://picasaweb.google.com/lh/photo/dTcU2i7GYh53xSrqjh--BQ?feat=direc > tlink There is a bit of extra componentry in the box to discharge the > caps on power-off and to switch in a resistor for soft start, but > basically it is just a rectifier and some caps. > > I am a bit puzzled about the status of my -V. > I guess that my 0V will be a few volts away from neutral, which is a > few volts from earth. Should there be an explicit connection between > my DC- and earth, machine 0V, mains neutral, none of the above? > > I think perhaps I should have a 1:1 transformer to float the DC, which > would then allow such a connection.
Definitely needed Andy, (in the AC feed of course ;) then you can ground the 0V line without stressing the rectifiers. Cheers, gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://204.111.67.138:85/gene> All true wisdom is found on T-shirts. ------------------------------------------------------------------------------ Using storage to extend the benefits of virtualization and iSCSI Virtualization increases hardware utilization and delivers a new level of agility. Learn what those decisions are and how to modernize your storage and backup environments for virtualization. http://www.accelacomm.com/jaw/sfnl/114/51434361/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
