Tool/software:
Hi,
I have found this paper that does the current loop compensation differently and it states that this approximation of Rf/Ri=Gain is not accurate. this paper shows better representation of the poles and zeros of current loop. which one to follow at the end ?
'' the first constraint is presented in [6], it avoids clipping of
the current amplifier at low duty ratios or high line, thus
avoiding switching instabilities. The second constraint,
given in [9], also avoids switching instability. In (14) the
min(x, y) functional notation means the minimum of x or y
and lVol is the absolute value of Vo to address the buck-
boost case (V, c 0). To simplify the design an
approximation for IGc-(s)l at s =jusis R C L ~ R C L I .However,
this approximation is only exact if the compensator pole is
actually placed beyond the switching frequency. It is more
accurate to use IGcL(j~s)l.Some iteration may be necessary.
The current loop design is now complete.''
u.dianyuan.com/.../414741241078795.pdf
