SCR circuit
SCR circuit
(OP)
I am looking for a circuit to control a high current (40 amps) demagnetizer coil using the 60Hz line. We have used SCRs and high current diodes in the past that have become obsolete. The gate control circuitry for the SCRs is also outdated being designed with discrete transistors, etc. I would like to "modernize" both. Any ideas where to look?





RE: SCR circuit
Dan - Owner

http://www.Hi-TecDesigns.com
RE: SCR circuit
With respect to specific parts becoming obsolete, there should be close replacements available. The requirement for these sorts of parts isn't going to go away.
RE: SCR circuit
RE: SCR circuit
As Triacs for 40 A RMS are a rare species, the approach with two SCRs connected antiparallel is well suited for this application.
If it is useful to redesign the discrete control circuit to integrated or even microcontroller control depends on two issues:
- complexity
- added benefits
If complexity is low and a more advanced technology does not provide added benefits, I'd just convert the old discretes to more recent types.