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Current limiting using microwaves.
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To: "'Tesla List'" <tesla@pupman.com>
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Subject: Current limiting using microwaves.
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From: Tesla List <tesla@stic.net>
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Date: Wed, 11 Feb 1998 01:23:31 -0600
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Approved: tesla@stic.net
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From: Nasalharp@aol.com [SMTP:Nasalharp@aol.com]
Sent: Tuesday, February 10, 1998 8:13 AM
To: tesla@pupman.com
Subject: Current limiting using microwaves.
Greetings
My power supply is a 5500v 350mA ex physics lab transformer -
big no current shunts, connected to ground and then to a 2000v
500mA microwave transformer. Giving me about 7500v at 350mA plus.
Primary capacitor is 0.09uF. Mains is 230v 50 Hz here.
I had been using a 2500w electric convector heater for current limiting.
But I tried instead using the primaries of microwave oven transformers,
with the secondaries shorted out. I now use 2 of these in series with a
110v variac used as a variable inductor. I can now control the current from
just under two amps (12" arcs) to over 10A (32" arcs - limited by the space
in the garage).
To use a variac as a variable inductor just connect to one end of the coil
and to the wiper. They won't do on their own as past a certain point they
tend to saturate and effectively become a dead short.
Curiously when I tried to suppliment these inductors by putting a resistor in
parallel with them - the coil output dropped - I must have some benevolent
resonance / voltage rise / wierdness happenning through the inductors.
Nice though - more output and control.
Microwaves are current limited but probably at about double the value
you might expect from their power rating.
Have fun,
Alan Sharp (UK)
till I am sure that my mail is working please
contact me at:
100624,504@compuserve.com
and
Nasalharp@Aol.com
My web site is at:
http://ourworld.compuserve.com/homepages/AlanSharp