On Sat, 24 Jan 2015, Marius Liebenberg wrote: > Date: Sat, 24 Jan 2015 17:51:10 +0000 > From: Marius Liebenberg <mar...@mastercut.co.za> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] DC Supply > > Peter > Do I understand this correctly. One can rectify the mains with a bridge > and then chop the voltage with a fet turning it off when the cap is > charged to a level. The fet is in series with the load. The fet is > turned on during every zero crossing. What happens when the fet turns of > is there any precaution to be made?
The MOSFET is turned off at a certain phase angle (that is, synchronously with the incoming AC waveform) so the pulsating 120 Hz (or 100 Hz) DC only ever reaches the desired peak voltage that feeds the capacitor input filter. The MOSFET switch may need a snubber/fast diode to capture the flyback from stray inductance (or any added inductive filtering) > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
