Re: Solid State Fuse

Genome wrote:
"Terry Given" <my_name@xxxxxxxx> wrote in message news:1141159318.287330@xxxxxxxxxx

Thinking about it, amost *all* circuits with switch mode supplies
probably have negative resistance, since they draw less current the
more voltage you feed them with.


yep, they do. thats why an input filter can make a stable smps oscillate. Likewise driving a smps with a smps can cause problems - Fred Lee's crowd at VPEC have written dozens, if not hundreds, of papers on this particular subject.

Cheers
Terry


I think you might find that Middlebrook had something to do with it....... Mind you I have no idea about the historical perspective.

http://ardem.com/

Ooooh

Input Filter Considerations in Design and Application of Switching Regulators
IEEE Industry Applications Society Annual Meeting, 1976 Record, 366-382 (IEEE Publication 76CH1122-1-IA).

BTW, who the *** is Fred Lee? Perchance.... does he take Middlebrooks explanation of the problem and generate shitloads of IEEE papers about how to solve it with an AVR implementing an appropriate PID controller in suftware?

DNA

VPEC are busy puking out hundreds of papers on some nice ways to prove the stability of smps loaded with many other smps - "distributed power" or words to that effect. basically just measuring output impedance.

Yep, Middlebrook was there at the beginning, his seminal (now now, dont be grubby) paper ought to be required reading.

Cheers
Terry
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