Modelling PFC Stage

[Dan M. (luizaranha)]

Hi, Im modelling in LTspice since long time a PFC-stage including a
Boost-Converter, which works in Boundary Conduction Mode. As control
scheme I use Peak Current Control mode.

As Im interested on a reaction of the output voltage on load variations,
I applied a load Jump from 800W to 1000W (at time stamp 33ms). The
problem is, that the controller is not able to stabilize the output
voltage after the load Jump. I always get low frequenz oscillations as
attached. In my model I use ideal switchtes and ideal inductances and
capacitances. The funtionality does work perfectly, but the settings or
the controller gains are not made correctly by myself. And I dont know
where to adjust, to get these ocillations away(or are they in a
acceptable range.

thx in advance for any hint!

greez kuebli

ps.: red course is the output of the integrator (analog), blue course is
the output-voltage, and the step represents the time stamp, where the
load jump occurs

[Jörg W. (dl8dtl) (Moderator)]

x-post http://embdev.net/topic/233487