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Kiran V. Sutar
02/23/10 04:23
Read: 1365 times
Mumbai
India


 		 #173458 - Current Rating of Thermistor/Inductor
Hi Members,
I am working on designing an SMPS of 24V 1Amp. and on another project that has TRIAC BTA41/600B.

I have referred to many documents during the designing of these products. Here is that relevant information:

For SMPS:




For TRIAC:



Here are my queries:
1. For SMPS we need to put a Thermistor to limit the in-rush current. So what should be the type NTC or PTC ?

2. for SCR: What is the theory of using a thermistor in such an application?
3. My Full Load Current is Max.25Amps.(@ 230VAC) so can a Thermistor pass this much current (@ 230VAC)? or do I need to use an Inductor for this application?



List of 26 messages in thread
TopicAuthorDate
Current Rating of Thermistor/Inductor      Kiran V. Sutar      02/23/10 04:23      
   NTC or PTC ?      Andy Neil      02/23/10 04:36      
      Thanks Andy      Kiran V. Sutar      02/23/10 05:44      
         PTC.        Steve M. Taylor      02/23/10 06:17      
            How will a thermistor LIMIT inrush current ?        Andy Neil      02/23/10 06:28      
         SCR dI/dt limiting      Andy Neil      02/23/10 06:39      
            Magic bit      Steve M. Taylor      02/23/10 08:32      
            Rule 8 comes from here...      Kiran V. Sutar      02/23/10 12:01      
         RE: I never read anything about this      Andy Neil      02/23/10 08:33      
         There are many types of "thermistor"      Andy Neil      02/23/10 11:12      
   Thanks Steve and Andy      Kiran V. Sutar      02/23/10 08:42      
      That's probably the safest route      Andy Neil      02/23/10 10:17      
   SCK NTC series...        Kai Klaas      02/23/10 10:02      
      That's probably not a good idea, unless...      Andy Neil      02/23/10 10:14      
      Thanks Kai...      Kiran V. Sutar      02/23/10 10:44      
         No, you have it exactly the wrong way around!      Andy Neil      02/23/10 10:56      
            Would any other NTC do the job..?      Kiran V. Sutar      02/23/10 11:21      
            Hint: cause of "inrush"      Andy Neil      02/23/10 11:22      
               The great White light NOW struck me !!!      Kiran V. Sutar      02/23/10 11:26      
         NTC versus PTC...      Kai Klaas      02/23/10 14:03      
            NTC or PTC?      Kalpak Dabir      02/24/10 21:10      
               Or by other words...      Kai Klaas      02/25/10 08:49      
                  Is that really true?        Rob Klein      02/25/10 09:20      
                     What I meant...      Kai Klaas      02/25/10 13:56      
                        It's all about conserving energy      Per Westermark      03/12/10 07:38      
   An informative link for In-rush current      Kiran V. Sutar      02/23/10 11:38      

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