Kim, I have run these HV regulators the regulate the HV DC voltage by
automatically adjusting the AC primary sinewave input. The voltage regulation
was great. It was around +/- 5 volts on a 4 KV supply from no load to full
load. It is great when you have a HV transformer that has poor voltage vs
current characteristics.
On the down side one has to shield this regulator circuit has it can produce
different birdies on the band. Also I found that there are a lot of
components and the reliablility tends to drop for the overall power supply.
Since the amplifiers that I had these regulators on where being used in
contest conditions I went with the minimum parts count and focused on better
transformers - that is transformers that had minimium sag when the load was
applied.
The circuit that I used used driver SCRs driving larger SCR's and regulating
the AC sinewave (both sides) at the zero crossing points.
Denis Ve6AQ
Kim Elmore wrote:
> I recently ran across an article in QEX that describes how to build a
> regulated HV supply for large amplifiers. Aside from cost and complexity,
> is there a good reason to avoid doing this? If so, what? It seems that
> overall linearity would be enhanced in the supply were regulated (an
> argument also made in the article).
>
> Kim Elmore, N5OP
> Kim Elmore, Ph.D.
> University of Oklahoma
> Cooperative Institute for Mesoscale Meteorological Studies
> "All of weather is divided into three parts: Yes, No, and Maybe. The
> greatest of these is Maybe" The original Latin appears to be garbled.
>
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