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Kai Klaas
01/19/06 06:24
Read: 772 times

#107792 - Surge current, cooling
Responding to: Steve M. Taylor's previous message
Steve said:
I always over-specify rectifiers, with high transient loads.

The experienced master speaks, U. Over-specifying rectifiers is always a good idea, I do the same.
By the way, the surge current or better inrush current the rectifier has to withstand can easily be estimated from resistance of secondary winding of mains transformer. Then, provide some headroom.

And don't forget to guarantee good cooling. Hot rectifiers cannot handle as high currents as cool ones!
Once I repaired a 1000W stage amp. I found out, that bridge rectifier body was not in proper contact to heatsink...

By the way, a damaged rectifier is very often the cause of failure. This can have to do with bursts and surges arriving from mains. It's a good idea to shunt these spikes arround the rectifier by connecting 10...47nF caps across each rectifier diode.


List of 40 messages in thread
Power supply      U Kaz      01/18/06 04:37      
   Book Horowitz and Hill      Oliver Sedlacek      01/18/06 06:36      
   all and every PS chip manufacturer has a      Erik Malund      01/18/06 06:53      
   Not enough information      Steve M. Taylor      01/18/06 06:54      
      more information here      U Kaz      01/18/06 08:56      
         Unregulated then      Steve M. Taylor      01/18/06 09:33      
            will these components do?      U Kaz      01/19/06 02:30      
               Overspecced      Steve M. Taylor      01/19/06 02:57      
                  Surge current, cooling      Kai Klaas      01/19/06 06:24      
                     Words of wisdom.      Steve M. Taylor      01/19/06 08:05      
                        count me in      Erik Malund      01/19/06 08:35      
                        Exactly      Kai Klaas      01/20/06 06:13      
                           ALWAYS.      Steve M. Taylor      01/20/06 06:43      
         How about . . .      Hal Albach      01/18/06 13:08      
            Energy Storage Capacitors        Andy Neil      01/19/06 04:23      
               transformer      U Kaz      01/19/06 04:50      
                  NO.      Steve M. Taylor      01/19/06 05:34      
                     20A?      Andy Neil      01/19/06 06:13      
                        some transient      Erik Malund      01/19/06 07:00      
                           And,...      Steve M. Taylor      01/19/06 07:59      
                              re: And...      U Kaz      01/19/06 08:40      
                                 Now you're talking      Steve M. Taylor      01/19/06 09:19      
                                    Are you sure?      Andy Neil      01/19/06 09:37      
                                 Storage cap      Kai Klaas      01/20/06 06:10      
                                    an element of fuzzyness      Erik Malund      01/20/06 06:49      
                                       My problem too      Steve M. Taylor      01/20/06 08:34      
                                          Fuzzy...      Andy Neil      01/20/06 09:28      
               ???      Steve M. Taylor      01/19/06 13:41      
                  !!!      Andy Neil      01/20/06 09:27      
   Is this okay...?      U Kaz      01/23/06 06:53      
      Have you read my last post?      Kai Klaas      01/23/06 07:27      
         I did.      U Kaz      01/23/06 08:06      
            Reliable or not ?        Farshid Jafari Harandi      01/23/06 08:27      
            Farnell      Steve M. Taylor      01/23/06 11:40      
               re: Farnell      U Kaz      01/23/06 12:24      
                  so farnell do not know how to copy      Erik Malund      01/23/06 12:40      
                  Whut ?      Steve M. Taylor      01/23/06 13:13      
                     sorry, but what is this ??      U Kaz      01/23/06 14:58      
                        typo      Steve M. Taylor      01/23/06 15:09      
      Ok in winter, problematioc in summer      Erik Malund      01/23/06 07:40      

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