[Amps] Inverter Microwave HV Supply

[Will Matney]

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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