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Erik Malund
01/31/10 16:41
Read: 144 times
Mt Airy, Nc
USA


 		 #172825 - very small components are not recommended
Responding to: Brian Reid's previous message
Save This Code
24VDC
480VAC --- fuse ---resistor ---*---------*-----*------*---- regulator
                               |         |     |      |
                           transient    zener  |      |
                          suppressor          |      |
                               |              |    reverse
                               |              |    biased
                               |              |     diode
                               |             SCR      |
                               |              |       |
gnd ---------------------------*--------------*-------*

the resistor shall be as large as can be without malfunction at whatever the lowest actual 24V can be
the SCR and the diode shall be capable of pulling the current the resistor allows at 480V.

While very small components are not recommended the heating of the components will be brief and thus they can be reated for less than the wattage they would need to handle if the fuse did not blow.

Erik

PS this will prothect your thingy, but if the 24V is a battery it will explode if 480VAC is shorted to it

List of 12 messages in thread
TopicAuthorDate
LM2574-5 AC voltage protection      Brian Reid      01/29/10 16:58      
   of course not      Erik Malund      01/29/10 17:06      
   no AC protection      Stefan KAnev      01/29/10 17:11      
      Thank you both      Brian Reid      01/29/10 17:34      
         fire brigade      Stefan KAnev      01/29/10 17:40      
            suggestions?      Brian Reid      01/29/10 23:45      
               something like this      Stefan KAnev      01/30/10 04:27      
               already made      Erik Malund      01/30/10 07:29      
                  just one more thing      Erik Malund      01/30/10 20:06      
                  thank you      Brian Reid      01/31/10 15:31      
                     It is very difficult...      Kai Klaas      01/31/10 16:23      
                     very small components are not recommended      Erik Malund      01/31/10 16:41      

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