Aerospace and Electronic Systems - October 2018 - 9
Mattos et al.
Table 1.
Converters Parameters
Components
Boost
Buck-Boost
Switches Sb e
Sbb
IRF540N
IRF540N
Diodes (all)
1N5822
1N5822
Inductor
110 μH
47 μH
Capacitor
100 μ F
680 μF
f
100 kHz
100 kHz
Tsw
10 μs
10 μs
Vbus
15 V
-
Vbat min
-
3.4 V
Vbat max
-
4.3 V
fco
1,5 kHz
1 kHz
MF
59,6 °
59,8 °
Hi(s)
-
1
Hv(s)
1
-
Vm
1
1
Battery charge current regulator.
Pi max
4.5 W
7.875 W
Pi min
1.125 W
4.5 W
Dmax
0.71
0.55
Dmin
0.23
0.48
Vpv max
9.0 V
9.0 V
Vpv min
3.4 V
3.4 V
> 0.5%
> 0.5%
k [4] and [20]
Figure 6.
Figure 7.
Buck-boost converter static characteristics.
BATTERY CHARGER AND MPPT CONVERTER
DMCD =
Figure 6 shows the buck-boost converter of stacked architecture.
From the principle of inductor energy balance Lbb, the converter
static gain is defined, according to (6).
DCCM =
M
1+ M
(6)
The boundary between CCM and DCM modes is given by (7).
DBCM = I in
I in = 4 (1 − D ) D
L≥
(8)
Thus, by performing a similar analysis to the boost converter,
the DCM duty cycle is given by (9).
I in
1
1+
M DCM
(9)
Figure 7 shows the duty cycle characteristics versus the normalized input current, normalized PVs voltage and current according to (6)-(8). The PV characteristics and the buck-boost converter
static gain provide a design region operation for the converter.
Equation (10) represents the inductor design for the buck-boost
converter.
(7)
where Iin is the normalized input current, given by (8).
3
DminTswV pv2 min
2 Pi
(10)
where D, Vpv , and Pi are shown in Table 1.
Equation (11) was used to define the converter capacitor.
C≥
PT
i sw Dmax
2
kbbVbat
min
(11)
where kbb = ΔVbb/Vbb and the values of Pi, D, Tsw, and Vbat min are
shown in Table 1.
OCTOBER 2018
IEEE A&E SYSTEMS MAGAZINE
9
Aerospace and Electronic Systems - October 2018
Table of Contents for the Digital Edition of Aerospace and Electronic Systems - October 2018
Contents
Aerospace and Electronic Systems - October 2018 - Cover1
Aerospace and Electronic Systems - October 2018 - Cover2
Aerospace and Electronic Systems - October 2018 - Contents
Aerospace and Electronic Systems - October 2018 - 2
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