which is how I tracked the book down, thanks. cost 3x more to post than to buy :)
I think the step makes sense, but it looks like they tossed in a star-delta conversion just to frighten us. I'm a bit crook right now, so I'll sit in front of the fire and do some algebra to see if it makes sense.
nope, and I had a good look thru my reference library, sans joy :(
Roddam did a piss-poor job of referencing, didnt he.
but the book is worth reading.
Cheers Terry
There's a hint on page 232, in reference to the L-C network for driving fluorescent tubes.... "the characteristic frequency is made approximately equal to the operating frequency and the network operates as a Boucherot network, giving a constant current output for a constant voltage input.
.... and then in a paper for a high power inverter from the Daresbury Laboratory.
Precis below.
L Vs---)))))---+-----+ | \\|/ I-load | \\ C=== / R-load | \\ | | -------------+-----+
"When driven by a sinusoidal voltage voltage (Vs) at the resonant frequency it has the property that the current in the load is given by:-
Iload = Vs/j.2pi.f.L.
ie, I-load is independant of the load value, making the circuit a natural constant current source."
Ref [4] P. Boucherot, "Concerning systems in which V1/I2 is constant". Revue Generale de l'Electricite, Vol 5, page 203. 1919.
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There are also audio references to the Boucherot Cell, which is the series R+C network placed on the output of amps to stabilise them. If the network acquires an inductance it gets called a Zobel Network.
-- Tony Williams.
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