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RE: Using SCR's For Regulating Input Current
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- Subject: RE: Using SCR's For Regulating Input Current
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Tue, 01 Feb 2005 13:21:33 -0700
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Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 11:15 AM 2/1/2005, you wrote:
Any of the usual phase control circuits works.. R & C with a neon bulb or
DIAC to the gates. If you can find old Motorola or GE Power Semi
applications notes there are circuits in there.
Original poster: "Carl Litton" <Carl_Litton@xxxxxxxxxx>
Thanks Jim. For this part of the project, the load is transformer only
(no gap and cap). It seems some sort of RC circuit would have to be
attached to the block to give the pulses to the gate to fire the SCR's.
Do you know any site that shows schematics of such a firing circuit?
Looks just like a lamp dimmer. And, in fact, a lamp dimmer with a
lightbulb or resistor load might work very well. You can use a pair of
diodes and some resistors(to limit the gate current) to take the voltage
from across the lamp into the SCR block.
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, January 31, 2005 6:12 PM
Subject: Re: Using SCR's For Regulating Input Current
Those modules are just two back to back SCRs (which works much better
a single device TRIAC, particularly on inductive loads).
They're sort of a grown up light dimmer, and use phase control. You
pulse to the gate at the right time, relative to the zero crossing.
Using such devices to control the very unusual load of a transformer
charging a capacitor with a spark gap is sort of dicey.
If you wanted to control voltage in a DC coil, with a big filter (or
6/12 pulse rectifier), they might work.