David,
The way to stiffen it up (improve regulation) is to increase the filter
capacitor size. However, this will increase the rms current needed coming into
the switching supply (charging current increases), and the inductor or
switching device (transistor, FET, etc) may not handle it. I'm not sure what
they use, a transformer or a choke, but it would increase the current through
both by increasing the capacitance. Another thing that would affect it is the
size of the inductor itself. The heavier it is, the better the regulation will
be. In other words, the higher the output current rating, the better it will
be. My guess is that the rms current would be around 1.8 to 2 times the DC
current (load current) to operate the way you want it to (good regulation).
Best,
Will
*********** REPLY SEPARATOR ***********
On 8/24/06 at 8:03 AM David Smith wrote:
>Several people have reported problems accessing the file. Try dropping
>the www - i.e.
>
>users.bigpond.net.au/dwsmith/hv_inverter.pdf
>
>I haven't noticed any interference from the oven here (or the wife).
>For use in a linear amp, the PSU would only be active during transmit,
>and I am intending to enclose it and add feedthroughs etc. to minimise
>interference to other rigs / operators, say in a field day situation.
>
>The main issue is how to get better voltage regulation from the PSU,
>which involves converting it from "constant power" mode to "constant
>voltage" mode.
>
>Regards,
>Dave
>VK3HZ
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