IEEE Power Electronics Magazine - September 2022 - 40

Gid = iL / d
^^
Gvi = Vo / iL
^ ^
iL
+
|Vac|
Q
R
d
-
C
L
iD
VO
Kl =
5.5
IVCC1101/2
gmi
-
-
KVI
C
1.4V
OTA
+
+
KF = 2
C
gmv
-
KL
Duty cycle
feed forward
Low line: 1
High line: 0.3
OTA
+
2.0V
2xfac
GSH
Duty-Ratio
Vramp = 4V
KVO
FIG 6 Average mode current loop with direct input voltage duty cycle feed forward.
FIG 7 2.5 kW TPPFC prototype.
cause a current ringing when the four MOSFETs are
turned off simultaneously, as indicated in Figure 9(a). A
proper deadtime, such as 150-200 μs, can minimize the
current distortion and give a good deadtime margin for
safe operation. To reduce the SynFETs' conduction loss,
low Rds_on MOSFETs are often used. However, the lowRds_on
Si MOSFETs always come with a large Coss. The
Coss stores significant energy and can cause a large current
spike when it is discharged to the boost inductor
abruptly, as shown in Figure 9(a) [12], [13].
Figure 9(a) shows the key signals during Vac crossing over
from a positive half cycle to a negative one. Just before Vac
40 IEEE POWER ELECTRONICS MAGAZINE z September 2022
FIG 8 AC voltage and current waveforms at Vac drop test (test
conditions: Vac = 110 V, Vdc (=Vo) = 400 V, Po = 1.25 kW).
crossing over, Q3's Coss, as shown in Figure 2, has already
been fully charged to the bus voltage Vo, the duty cycles of Q1
(main FET) and Q2 (freewheel FET) are near 1 and 0 respectively.
After the Vac crossover point, Q2 becomes the main
FET and its duty cycle jumps from near 0 to near 1, which
essentially applies the Coss voltage, Vo, directly across the
boost inductor. As a result, a large current spike can occur.
V_Comp
Comp
I_Comp
Current Loop
-
+
Voltage Loop

IEEE Power Electronics Magazine - September 2022

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - September 2022

Contents
IEEE Power Electronics Magazine - September 2022 - Cover1
IEEE Power Electronics Magazine - September 2022 - Cover2
IEEE Power Electronics Magazine - September 2022 - Contents
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