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Bipolar capacitive transformer/transformerless TC



Original poster: "Jolyon Vater Cox by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

I would be interested to know whether the topology below would be any use 
in building either a bipolar "capacitive transformer" TC or
(with the capacitors C2a and C2b replaced with two inductors both equal to 
half the total inductance of L2) a bipolar "transformerless" TC.


The circuit uses a "balun" of three inductors (each equal to half of the 
total primary inductance, L1)to transfer power from the single-end grounded 
system C1-L1a-L1b to the balanced system L1b-C2a-L2-C2b-L1c (neglecting C3 
the parasitic capacitance across L2).
The capacitors C2a and C2b are each equal to twice the value of C2, the 
coupling capacitance.

Equalities:
L1a=L1b=L1c=L1/2
L1a+L1b=L1b+L1c=L1

C2a=C2b=2C2
(C2a^-1+C2b^-1)^-1=C2

+----+-C1-+
|    |   |
|    |    L1a
|    |   |
psu  sg1  +-C2a-+--+
|    |   |     |  |
|    |   L1b   |  |
|    |    |     |  |
+----+----+     L2 C3
|         |     |  |
gnd       L1c   |  |
           |     |  |
           +-C2b-+--+

Would it work? Would the three inductors L1a,L1b and L1c have to 
magnetically coupled
as a transformer, or can they just be electrically coupled to act as a 
"transformerless" balun?

Jolyon.