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The mechanical Hum problem can be reduced by disconnecting the capacitor
during standby. It will still be there during transmit. GE did this as an
option in there Mastr II
mobile radio base station power supplies. Ferro-resonant regulating
transformers
are not very efficient, and I think they dissipate a fair amount of power
even unloaded,
so there is a price to pay for using them.
Also there output regulation with load variations in not real good
(there is no compensation for the voltage drop in the secondary winding).
There principal application as I understand it is reducing the
output variation with supply voltage variation. It may be possible to
use the transformer as a magnetic amplifier in conjunction with an active
feedback element that looks at the DC output and provide very good
regulation.
In the past I had wondered if Ferro-resonant regulating transformers could
be
used in that fashion, but I do not know enough about Ferro-resonant
regulating
> transformers or magnetic amplifiers either to say for sure.
>
Brian Kline
WA6QDP
> ----------
> From: Jerry Flanders[SMTP:jflanders2@home.com]
> Sent: Monday, February 18, 2002 9:14 PM
> To: sbauder@wwt.net; amps@contesting.com
> Subject: Re: [AMPS] ferro-resonant transformers?
>
>
> The kind I am familiar with require capacitors to run, and HUMMMMmmmm
> noisily while powered.
>
> Jerry W4UK
>
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<TITLE>RE: [AMPS] ferro-resonant transformers?</TITLE>
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<P><FONT SIZE=3D2 FACE=3D"Arial">The mechanical Hum problem can be =
reduced by disconnecting the capacitor </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">during standby. It will still be =
there during transmit. GE did this as an option in there Mastr II =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">mobile radio base station power =
supplies. F</FONT><FONT SIZE=3D2 FACE=3D"Arial">erro-resonant</FONT> =
<FONT SIZE=3D2 FACE=3D"Arial">regulating</FONT> <FONT SIZE=3D2 =
FACE=3D"Arial">transformers</FONT>=20
<BR><FONT SIZE=3D2 FACE=3D"Arial">are not very efficient, and I think =
they dissipate a fair amount of power even unloaded,</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">so there is a price to pay for using =
them.</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Also there output regulation with =
load variations in not real good </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">(there is no compensation for the =
voltage drop in the secondary winding). </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">There principal application as I =
understand it is reducing the </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">output variation with supply =
voltage variation. It may be possible to </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">use the transformer as a magnetic =
amplifier in conjunction with an active </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">feedback element that looks at the DC =
output and provide very good regulation. </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">In the past I had wondered if</FONT> =
<FONT SIZE=3D2 FACE=3D"Arial">F</FONT><FONT SIZE=3D2 =
FACE=3D"Arial">erro-resonant</FONT> <FONT SIZE=3D2 =
FACE=3D"Arial">regulating</FONT> <FONT SIZE=3D2 =
FACE=3D"Arial">transformers</FONT><FONT SIZE=3D2 FACE=3D"Arial"> could =
be </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">used in that fashion, but I do not =
know enough about</FONT> <FONT SIZE=3D2 FACE=3D"Arial">F</FONT><FONT =
SIZE=3D2 FACE=3D"Arial">erro-resonant</FONT> <FONT SIZE=3D2 =
FACE=3D"Arial">regulating </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">transformers</FONT><FONT SIZE=3D2 =
FACE=3D"Arial"> or magnetic amplifiers either to say for sure.</FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">Brian Kline</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">WA6QDP</FONT>
</P>
<BR>
<UL>
<P><FONT SIZE=3D2 FACE=3D"Arial">----------</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">From: Jerry =
Flanders[SMTP:jflanders2@home.com]</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Sent: Monday, February 18, =
2002 9:14 PM</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">To: =
sbauder@wwt.net; amps@contesting.com</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Subject: =
Re: [AMPS] ferro-resonant =
transformers?</FONT>
</P>
<BR>
<P><FONT SIZE=3D2 FACE=3D"Arial">The kind I am familiar with require =
capacitors to run, and HUMMMMmmmm </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">noisily while powered.</FONT>
</P>
<P><FONT SIZE=3D2 FACE=3D"Arial">Jerry W4UK</FONT>
</P>
</UL>
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