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???
03/18/06 19:32
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#112462 - yes you are right
Responding to: ???'s previous message
Erik Malund said:
was your assignment not to find out how switches withstood inrush current?

yes. for which i need to use some inrush current limiting network to protect the reed switch if it doesnt withstand.

I think resistor parallel to switch could be one option,
since the disadvantage of this method as proposed by kai (large current consumption when switched sequentially) would only happen during testing in my place and since, i came to know that the customer will be using the switch in bikes for indicating some thing ( which would not be sequential)

Also,
for once, i just connected the lamp directly to the 12 V through the reed switch (switch is driven by a driver circuit for ON / OFF operation). i could see only the switch getting closed parmanently.
'NO SWITCHING TOOK PLACE'(note: i just saw how the switch reacts, though the low rating was pointed out in the discussion previously..) and i found the contact opens only when the switch is taken out of the coil (in which the switch would be kept to drive the lamp) and when examined the switch seems to be in good condition..

Erik said:

How is designing current limiters going to do that?


I just wished to ask few explanations on that current limiter circuit that Kai had posted. Having read the description i too believe it couldnt be used for my application.
but of course i could use that circuit when it happens for me to drive a lamp load in future.

As an alternative to resistor parallel to switch method,
any suggestions on a simpler method, with which, the inrush current flow through the reed switch could be controlled would be highly useful.


thanking you,
Suresh.






List of 57 messages in thread
TopicAuthorDate
inrush current + suitable voltage sour            01/01/70 00:00      
   Inrush current of lamp            01/01/70 00:00      
      Current inrush            01/01/70 00:00      
         NTC?            01/01/70 00:00      
            Soft-start            01/01/70 00:00      
               8 reed SW parallely + 21.12A / at 12VDC            01/01/70 00:00      
                  Car battery???            01/01/70 00:00      
                  inrush current            01/01/70 00:00      
                  totally irrelevant            01/01/70 00:00      
                  No testing needed, standardly            01/01/70 00:00      
                     replies            01/01/70 00:00      
                        Reply to "replies"            01/01/70 00:00      
                           the difference between "cheap" and "inex            01/01/70 00:00      
                           current limit resistor            01/01/70 00:00      
                              are you just grasping for straws?            01/01/70 00:00      
            NTC, yes            01/01/70 00:00      
               Filaments            01/01/70 00:00      
                  In the days of radios for AC and DC            01/01/70 00:00      
                     Thanks            01/01/70 00:00      
            resistor parallel to Switch!            01/01/70 00:00      
               MOSFET, constant current source?            01/01/70 00:00      
                  not for my use            01/01/70 00:00      
                     Ok, but...            01/01/70 00:00      
                        but i think            01/01/70 00:00      
                           Relays            01/01/70 00:00      
                              yes ofcourse            01/01/70 00:00      
                                 here we go again            01/01/70 00:00      
                                    Even more!!            01/01/70 00:00      
                                       werlcome to the club            01/01/70 00:00      
                                       reply            01/01/70 00:00      
                                          why did you not say so?            01/01/70 00:00      
                                          You made a fool of us!            01/01/70 00:00      
                                             reply            01/01/70 00:00      
                                                That's no fun!            01/01/70 00:00      
                                                   Suresh, I hope you had fun            01/01/70 00:00      
                                                   reply            01/01/70 00:00      
                                                      yeah 6 days later.            01/01/70 00:00      
                  Hello Kai,            01/01/70 00:00      
                     Look at here            01/01/70 00:00      
                        Thank you very much Kai.            01/01/70 00:00      
                           It just strikes me            01/01/70 00:00      
                              yes you are right            01/01/70 00:00      
                                 Reed switch problems            01/01/70 00:00      
                                    Current rating?            01/01/70 00:00      
                                       I recall long ago something about a "sti            01/01/70 00:00      
                                       Reed problem            01/01/70 00:00      
                                          Glueing together            01/01/70 00:00      
                                             Reed problems            01/01/70 00:00      
                                                reed relayrs            01/01/70 00:00      
                           power dissipation calculations?            01/01/70 00:00      
                              bulb voltage drop            01/01/70 00:00      
                                 Thanks            01/01/70 00:00      
                                 (.2*bulb resistance            01/01/70 00:00      
                                    The bulb            01/01/70 00:00      
                              Constant current during inrush moment            01/01/70 00:00      
                                 Thanks a lot Kai            01/01/70 00:00      
         Choke would be huge            01/01/70 00:00      

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