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???
03/02/11 15:35
Modified:
  03/02/11 15:36
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 		 #181395 - ignore - double posting - sorry
Responding to: ???'s previous message
Peter Huijssen said:


Thinking about it : I'm going to take advantage of the power input range of my powersupply which is an SMPS. Min 9V , max 30V input.
And limit the voltage at about 20V. Many adapters are 9V, 12V so that's a nice limit I guess.

Peter - why have a limit?

Why not get a decent switcher, that accepts a wide input range, and is capable of delivering whatever current you need? National has a lot of switchers, and its quite easy to find one, that accepts 40V on the input.

From you power connector, use a tiny series restance a few ohms or so, a properly rated tranzorb, a bridge rectifier, a few caps, and then the regulator. No need for polyfuses or other protection; the inside electronics is designed to accept what ever PSU might be in the at bottom of some ones touring flightcase!


Per

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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