>
>In the choke input filter, the current is only 'constant' with infinite
>inductance - see Terman. For a finite inductance, there is a variation,
>although the esign of the filter minimises that. In the 'tuned choke'
>filter, the idea is that the parallel C and L look like a big inductance
>when near (slightly HF of ) resonance, so keeping the current much more
>nearly constant in the choke e.g on 50 Hz mains with full wave rectification
>and 100Hz ripple, a 10Henry choke and a 0.25 microfarad shunt capacitor look
>like a choke of 762.5 Henries. So a swinging choke will move further from
>'resonance' (the definition of resonance is important here) as the current
>goes up, but as the critical inductance comes down, the regulation may not
>be too bad - depending on values, choke resistance etc. Not ideal, but
>possibly workable.
>
What does it take to convert a swinger to fixed L?
>One thing to avoid is the combination looking capacitive at minimum current;
>as the choke inductance goes down with increasing current, you can hit
>resonance with some very high voltages.
>
>73
>
>Peter G3RZP
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampsfaq.html
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>Problems: owner-amps@contesting.com
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>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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