Programming instructions

Misc. Components
Multisim Component Reference Guide 13-10 ni.com
13.7 Buck Boost Converter
This component is an averaging circuit model that models the averaging behavior of a DC-to-
DC switching converter. It is based on a unified behavioral model topology. The topology
models both small-signal and large-signal characteristics of this converter power stage. This
behavioral model can be used to simulate DC, AC and large-signal transient responses of a
variety of switched-mode power supplies, operating in both the continuous and discontinuous
inductor current condition modes (DCM and CCM, respectively).
13.7.1 Characteristic Equations
in which I
LL
is governed by:
where D = duty ratio of the switching devices.
For the DCM:
I
D
DD
II
D
DD
I
I
D
DD
II
D
DD
I
iLLLDL
oLLLDL
=
+
∗+ =
+
∗
=
+
∗+ =
+
∗
22
2
2
2
2
()
()
[]
I
L
DV D V dt
LL i o
o
t
=∗−∗
∫
1
2
()
DD
V
V
V
I
DV D D
LF
i
o
L
LD
i
s
2
2
0
2
=
=
=
∗+
∗∗
ComponentRef.book Page 10 Thursday, December 7, 2006 10:12 AM