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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.