[Terry Given]

That's him. As mentioned in previous threads I was
unable to obtain a copy of Baxandall's original paper
so had to do with Thomas Roddam's description.

which is how I tracked the book down, thanks. cost 3x more to post than
to buy

Now then, move on to page 191, where TR developes
the voltage-driven series-resonant form into a
half-section filter. Can you follow the final step,
to figure 10.25, and add values to it?

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.

Figure 10.25 is given below.

L1 C2
Squarewave voltage----((((((---+---||---+---+
| | |
| ) \
C1=== L2) /Rload
| ) \
| | |
-----------------+--------+---+

L2 is the primary of the output transformer, with
Rload referred to the primary.


On page 192, do you know what a "Boucherot Impedance
Transforming Network" is?

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

 

[Tony Williams]

On page 192, do you know what a "Boucherot Impedance
Transforming Network" is?

[/QUOTE]

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.

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.

<http://www.astec.ac.uk/Preprint Articles/epac96/MOP035G.PDF>

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.

------------------------------------------------------

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.