Quote:
Originally Posted by rickst29
The UG offers no information about the nature of impedence variations which will present to the PSU.
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It doesn't matter. This is DC electronics feeding varying loads, they really only see a reactance when they start. And most of those boost regulators are current limiting, so they can handle a capacitive load which presents close to 0 Ohms when it starts, since that's the norm for electronic circuits. Your boost voltage regulator didn't die because of the load impedance.
Resistance would be a more accurate way to state this rather than impedance, since it's mostly DC. And if you want to talk about AC, you need to consider reactance rather than impedance, since it matters whether your load is inductive or capacitive and impedance doesn't say which.
If they say their device always presents a low AC impedance, that just means they have a capacitor across the input. A high AC impedance would indicate a choke in series with the input or you're feeding a transformer winding through some sort of oscillator. Other than that, the DC resistance will dominate, AC probably doesn't matter at all, and the resistance will range across whatever is required to provide the current as various devices turn on and off.
If you need to condition the load after your el cheapo voltage converter, you probably just need a capacitor in parallel.