Hi Will,
There's little doubt that the input and output filtering is light-on.
However, it's not a lack of regulation that's the problem - it's that
the PSU controller regulates for constant POWER output (and does a good
job of that I might add). So, no matter how stiff the input (or output)
filtering is, the PSU controller will still not give the desired
constant voltage ouput.
Regards,
Dave
VK3HZ
Will Matney wrote:
> 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
>
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