Re: determining minimum current loop bandwidth
- From: Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@xxxxxxxxxxx>
- Date: Sat, 20 Oct 2007 18:49:27 -0400
Mook Johnson wrote:
I'm designing a current mode switching power supply with a load that will have a very strong load current harmonic at 50Hz (repeating sine wave from 100mA -> 1A -> 100mA in 20mS). I need the current control loop to have enough bandwidth to regulate this so it has less than 5% effect on the output voltage. There is not sufficient bulk capacitance on the output to supply the 50Hz current due to packaging so the control loop will see a large portion of it (assume all of it).Off the top of my head, I would say the switching frequency is the
How do i determime the bandwidth and loop gain required to achieve this level of performance?
first factor that governs the regulation response. And the
next factor would be the amount of capacitance being used on that
switching carrier frequency for the filtering process.
I suppose one could go as far as putting a regulating shunt load
on the output to increase the Skew rate.
Lots of factors.. But in my opinion, the switching frequency is
the major contributor here for the response time.
--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
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- From: Mook Johnson
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