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???
02/28/11 14:38
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 		 #181337 - comments
Responding to: ???'s previous message
To protect a powerinput (9VDC, max 1A) against overvoltage I want to use a thyristorbased crowbar.
good and bad. It works but is (in electronic terms) awfully slow

I have been reading about polyfuses and simular devices that they loose trip point accuracy when they have tripped a few times.
I have had no problems with polyfuses, is that becuse I have been lucky and the change was less than what I could not handle, I do not know. For the typical fuse you do not need any extreme "trip point accuracy" if you fuse a 500mA circuit with a 1A fuse, it can change 50% without hurting you.

Erik




List of 31 messages in thread
TopicAuthorDate
Overvoltage protection            01/01/70 00:00      
   comments            01/01/70 00:00      
   Trip Point Accuracy            01/01/70 00:00      
   Voltage trip and current trip            01/01/70 00:00      
   First, you must find out...            01/01/70 00:00      
      a little more info on the application            01/01/70 00:00      
         then this may be simpler            01/01/70 00:00      
            Voltage regulator as CC?            01/01/70 00:00      
               if you use a transistor for the CC ...            01/01/70 00:00      
                  And you could even limit...            01/01/70 00:00      
               Is it worth it?            01/01/70 00:00      
                  This one, e.g....            01/01/70 00:00      
                     That's the kind of thing            01/01/70 00:00      
                        CC source            01/01/70 00:00      
                           Turn the tables...            01/01/70 00:00      
                              Pros / Cons            01/01/70 00:00      
                                 Professional eqipment = be nice/forgiving to your customers            01/01/70 00:00      
                                    Never to old to learn            01/01/70 00:00      
                                       PWM it            01/01/70 00:00      
                                          PWM !            01/01/70 00:00      
                                       max 20V........            01/01/70 00:00      
                                       ignore - double posting - sorry            01/01/70 00:00      
                                       Power outage totally different            01/01/70 00:00      
                                          Power failure            01/01/70 00:00      
                                 500mA backlight, but what voltage            01/01/70 00:00      
                           A vote for your plan            01/01/70 00:00      
                              Midi switcher            01/01/70 00:00      
                                 Midi Sequencer < < Maxi Engineering            01/01/70 00:00      
                                    building a good robust product            01/01/70 00:00      
                                 Common Mode filter            01/01/70 00:00      
                                    Isn't needed in your case probably...            01/01/70 00:00      

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