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???
07/14/04 18:27
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#74246 - RE: Ramping instead of zero-crossing
Responding to: ???'s previous message
I'd say this is walking on thin ice already,
Not a good place to generate a lot of heat :-)

Erik: I'm not talking about running 10A through a device that provides 1Kohm resistance at that moment (that would be about 1000V) but simply over short time (100ms?) decrease the resistance.<>/i>
for simplicity let's assume a resistive load. !A @220V = 22 ohms.

So at the midpoint you have the limiter @ 22 ohms = total 44 ohms = 5A and each take 110V, so it is 550Watts. Even for a very short time, that would fry most devices.

Anyhow, if you try it and it works, do not believe that's it. You can easily get in a situation where the device weakens just a bit every time it happens and after 1000 instances finally break.

"succesful testing does not prove the abscence of bugs, it proves the abscence of known bugs"

Erik


List of 23 messages in thread
TopicAuthorDate
Ramping instead of zero-crossing            01/01/70 00:00      
   RE: Ramping instead of zero-crossing            01/01/70 00:00      
      This is the fundamental flaw            01/01/70 00:00      
   RE: Ramping instead of zero-crossing            01/01/70 00:00      
      RE: Ramping instead of zero-crossing            01/01/70 00:00      
         RE: Ramping instead of zero-crossing            01/01/70 00:00      
            RE: Ramping instead of zero-crossing            01/01/70 00:00      
               RE: Ramping instead of zero-crossing            01/01/70 00:00      
   RE: Ramping instead of zero-crossing            01/01/70 00:00      
   RE: Ramping instead of zero-crossing            01/01/70 00:00      
   RE: Ramping instead of zero-crossing            01/01/70 00:00      
      RE: Ramping instead of zero-crossing            01/01/70 00:00      
         RE: Ramping instead of zero-crossing            01/01/70 00:00      
         RE: Ramping instead of zero-crossing            01/01/70 00:00      
            RE: Ramping instead of zero-crossing            01/01/70 00:00      
               RE: Ramping instead of zero-crossing            01/01/70 00:00      
                  RE: Ramping instead of zero-crossing            01/01/70 00:00      
   RE: Ramping instead of zero-crossing            01/01/70 00:00      
      RE: Ramping instead of zero-crossing            01/01/70 00:00      
         RE: Ramping instead of zero-crossing            01/01/70 00:00      
            RE: Ramping instead of zero-crossing            01/01/70 00:00      
               RE: Ramping instead of zero-crossing            01/01/70 00:00      
                  RE: Ramping instead of zero-crossing            01/01/70 00:00      

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