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Steve M. Taylor
07/27/05 03:37
Read: 1072 times
State College

#98253 - Take one apart
Responding to: Prahlad J. Purohit's previous message
Prahlad J. Purohit said:

Do I really need Capacitor bank for converting rectified Pulsating DC to pure DC. What kind of capacitors are suitable here 400V min 100Amps. Do these induction heaters

1. Rectify using thyristors [ SCR ].
2. Capacitor for converting to pure DC.
3. IGBT/MOSFET H Bridge for converting to 40kHz AC.

Its your field Prahlad, can't you get inside another unit and find out ?
Anyway, to your points
1.) I doubt. What would be the point ? Just use BIG rectifiers.

2.) Unavoidably, but very high voltage caps hold more energy than their 5V counterparts. It doesn't have to be VERY pure DC though, so lots of ripple would be acceptable, provided you can still get weld drive.

3.) Yes.

4.) You need VERY low ESR caps, but mechanically big ones HAVE low ESR don't they ?


List of 18 messages in thread
High Power High Frequency.      Prahlad J. Purohit      07/26/05 22:00      
   high voltage high frequency      Terry Lingle      07/26/05 23:16      
      Similar ?      Steve M. Taylor      07/27/05 02:27      
      Capacator?      Prahlad J. Purohit      07/27/05 02:44      
         Take one apart      Steve M. Taylor      07/27/05 03:37      
            SCR's      Prahlad J. Purohit      07/27/05 07:53      
            Big Caps      Kashyap Deepak      08/06/05 14:45      
   isn't a weld basically a short?      Erik Malund      07/27/05 08:24      
      400V 100A      Prahlad J. Purohit      07/27/05 08:40      
         Big caps      Terry Lingle      07/27/05 09:19      
         Inverter      Steve M. Taylor      07/27/05 09:43      
            Yes they are similiar      Terry Lingle      07/27/05 11:50      
               not ip infringing      Steve M. Taylor      07/27/05 12:19      
                  ip      Terry Lingle      07/27/05 12:26      
                     Nah      Steve M. Taylor      07/27/05 13:04      
         High current      Stuart Hall      08/10/05 06:33      
            Spot the welder      Steve M. Taylor      08/10/05 07:02      
            Re: High Current.      Prahlad J. Purohit      08/10/05 08:49      

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