> I work for a company that designs and builds switchmode power supplies, > so I have access to lots of power supply and filter components
Man with hammer says: "Mmmm, nails!" > It has been a long time since I have seen an SCR preregulator. They have > almost the same complexity as a switcher (from a parts count > standpoint), without any of the advantages, other than slightly lower > noise levels at higher frequencies. However, they are bad for line noise > (conducted emissions) and power quality (power factor, harmonic > distortion) and require oversized transformers, inductors and > capacitors, even compared to a normal linear supply. These are now > completely abandoned (except maybe at very high power levels, as used in > industrial processes and I believe in rail transportation) because they > can't meet the power quality requirements and they cost too much/are too > big and heavy. Conduction-angle preregulators were used in some of the HP/Harrison benchtop power supplies (my 6263B has one), as well as some of the smaller Carver audio amplifiers in the 80s. Definitely one of those 'dead-end' branches of the great evolutionary tree of electronics... -- john, KE5FX _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
