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Re: [TCML] confused
Hi Reuben,
?Pulsed DC is mathematically equivalent to square-wave AC; the output is AC.?There is no such thing as a DC transformer, just sloppy terminology.
Matt D.?
You are incorrect in saying there is no such thing as dc transformers they do
exist they pulse dc to simulate ac
Reuben
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Reuben Marcus <rmferaligator@xxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, 18 Jun 2008 5:34 pm
Subject: Re: [TCML] confused
You are incorrect in saying there is no such thing as dc transformers they do
exist they pulse dc to simulate ac
Reuben
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Quarkster <quarkster@xxxxxxx>
Date: Wed, 18 Jun 2008 13:05:58
To:Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] confused
Douglas -
Maybe more confusion than you realize .....
First, transformers are alternating current (AC) devices; there is no such
thing as a "DC" transformer. The basic operating principle of a transformer
relies on rapidly changing magnetic fields, which are generated by an AC
current. A transformer utilizes an AC input, and provides an AC output. You can
rectify the output of a transformer to obtain DC, but the output of a
transformer will always be AC.
Second, you mention "power factor" as "the major rule of thumb" in designing a
tesla coil. Perhaps you are thinking that "power factor" is a measure of Tesla
coil efficiency, or output. This is incorrect. "Power factor" is a means of
quantifying the phase relationship of the current and voltage in an AC circuit.
JAVATC is providing information on the power factor of the HV supply transformer
(frequently a NST). The effects of "power factor" on the operation of a typical
Tesla coil are quite small, but could play some small role if you are using a
long extension cord, or are running a coil that is drawing sufficient current to
be very near the trip point of your home's circuit breaker. Wikipedia has a
description of power factor at: http://en.wikipedia.org/wiki/Power%5Ffactor
Much more important in Tesla coil design and operation are the losses in the
tank circuit (spark gap, tank capacitor, primary coil and its connections) and
the basic tuning of the coil to obtain primary/secondary resonance. Assuming an
NST-powered coil, once the coil is up and running well you can experiment with
adding Power Factor Correction (PFC) capacitors on the AC input side of the NST
to reduce "apparent" current draw.
Regards,
Herr Zapp
douglas smith <eyemfedup2@xxxxxxxxx> wrote:
all this talk about hooking ac transformers in series has got me really
confused.
i always thought that you could connect DC output transformers in series
but not AC.
i know that there is some kind of circuit that allows you to do so but just
putting two nst's in series sounds like trouble to me.
why would you want to anyway?
in designing some 15 different possible coils with javatc it seems to me that
a higher voltage is not always that necessary.
example: i would get the same spark length and power factor with using a
15000 v @ 30 ma as i would with a 7500 v @ 60 ma
of course I'm no expert the math just seems the same (P=I x E) and also with
javatc
I'm sure that there is a limit on how low you can go with the voltage vs.
current
but it does seem to me that the major rule of thumb is the power factor.
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