On 12/25/2015 11:05 PM, Gene Heskett wrote: >> The bridge rectifier is connected to 120v so no transformer is >> there... not sure how it gets 190vdc out of 120vac but it does. Now to >> find some fuses for it... may be Tuesday before I can use that. > That is a puzzle John, the best DC I can get out of that with kcalc, > assuming a perfect bridge rectifier feeding a capacitor input filter is > 179 volts & change. Assuming a 127 volt, more or less standard AC input > that is.
A transformer's output voltage is rated at the rated load. If you are not loading the transformer at the rated power, then you will usually see between 10% and 30% higher output voltage. The amount of increase depends on the quality of the transformer. So, the DC conversion at (almost) no load will be between 120 * sqrt(2) * 1.1 = 186V and 120 * sqrt(2) * 1.3 = 220V. Taking account for a 2..3V droop at the bridge-rectifier would mean anything between 183...217V would be quite normal at 120V AC input. -- Greetings Bertho (disclaimers are disclaimed) ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
