Re: Transformerless TC-Excited Capacitive Transformer?

["Tesla list" <tesla-at-pupman-dot-com>]

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

Antonio,
I have had a look at the circuit diagram I sent the other day
and it seems that when C1 and L1 (which are common to both networks) are
included
the lefthand network is sixth-order bandpass filter
and the righthand a fouth-order lowpass filter -admittedly that does not
seem quite right.


So how about a couple of bandpass filters connected oppositely across L1?
That way -when C1 and L1 are included-  won't both sides of the bridge be
sixth-order filters?
Would there still be problems with the ground capacitance "unbalancing" the
bridge or would the effects of ground capacitance be less dominant  with
this circuit than with the fourth-order "twin"?

+----+------------------------+-------+----------+
                             |        |                                |
|               |
                             |        L2                             C4'
L3'          C2'
                             |        |                                |
|               |
+-------+---C1-----+      |                               +-------+---C3'--+
|          |                |        |                                |
|
PSU  SG1         L1     |                     A       B
|
|          |                |        |                      |
|
+-------+------------+      +---C3---+----+
|
                            |         |               |      |
|
                            |        C2           L3  C4
L2'
                            |         |               |      |
|

+----+-----------+----+---------------------------+
                                                            |
                                                          M1
                                                            |
                                                         GND
Finally, won't the ground current or voltage (as measured by M1) be at a
MINIMUM for a properly balanced bridge whether it be fourth-order,
sixth-order or so on -can this "null" be used as an aid to setting up the
circuit?

Jolyon.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, December 05, 2002 2:28 AM
Subject: Re: Transformerless TC-Excited Capacitive Transformer?


 > Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
 >
 > Tesla list wrote:
 >  >
 >  > Original poster: "Jolyon Vater Cox by way of Terry Fritz
 > <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
 >  >
 >  > Antonio,
 >  > Here is the diagram. I used Courier New on Works -if it comes out
garbled
 >  > try "Rich Text"
 >
 >  > +--C1--+--+---------+----+
 >  > |      |  |         |    |
 >  > |      |  L2  (A)   L3  C4
 >  > |      |  |    |    |    |
 >  > |      |  +-C3-+    +----+
 >  > +---+  |  |    |    |    |
 >  > |   |  |  |    |   (B)   |
 >  > P   S  |  |    |         |
 >  > S   G  L1 C2   |         |
 >  > U   1  |  |    |         |
 >  > |   |  |  |    |         |
 >  > +---+  |  |    |         |
 >  > |      |  +-C4-+         |
 >  > |      |  |    |         |
 >  > |      |  |    L3        C3
 >  > |      |  |    |         |
 >  > +------+--+----+---------+
 >
 > After some adjustments, I see a low-pass branch (C3, L3, C4), and a
 > more complicated fast band-pass branch ending in (A). The idea makes
 > sense, and C4, the element that is slowing down the low-pass
 > branch, can be eliminated. But the design of this complex circuit
 > would be complicated. The symmetry that allows a direct design
 > with identical branches doesn't exist in this circuit.
 > The primary waveforms required for the two different branches are
 > different, an so they can't be independently designed and combined.
 > An approximate design with similar primary circuits, followed by
 > some tuning, may work, but I am not sure if an exact design for
 > complete energy transfer is possible with different branches.
 > But this is an interesting idea to investigate.
 >
 > Antonio Carlos M. de Queiroz
 >
 >
 >