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AN3095 Folha de dados(PDF) 22 Page - STMicroelectronics

Nome de Peças AN3095
Descrição Electrónicos  The STEVAL-ISV002V2 demonstration board is the same
PDF  55 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3095 Folha de dados(HTML) 22 Page - STMicroelectronics

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DC-AC converter
AN3095
22/55
Doc ID 16555 Rev 3
The LCL filter is effective only if proper damping is added. Passive damping, realized with a
resistor series connected to the filter capacitor was used for this application. The value of
the resistor is chosen to be one third of the impedance of the capacitor at the resonant
frequency:
Equation 47
●
Selection of semiconductor devices
The semiconductors selected for the DC-AC section are 600 V, 35 A IGBTs with internal fast
diodes used to minimize the effect of recovery at turn-on. The choice of IGBTs is a trade off
between cost and efficiency. The part number of the device used is STGW35HF60WD,
which shows very good performance in terms of switching losses. The electrical
characteristics of this device are shown in Table 5.
The power losses in each IGBT may be calculated considering conduction losses, switching
losses and diode losses.
Conduction and switching losses in IGBTs may be evaluated according to the following
equations:
Equation 48
Ω
=
ω
=
8
.
5
C
*
*
3
1
R
res
damp
Table 5.
STGW35HF60WD electrical characteristics
Part number
Saturation voltage
Collector
current
Eoff
Eon
Gate
charge
STGW35HF60WD
VCEsat @125 °C,13 A
IC@100 °C
Eoff @125 °C,15 A Eon @125 °C,15 A
Qg
1.8 V
37 A
360 µJ Rg=47
Ω
300 µJ Rg=56
Ω
102 nC
Ω
=
=
φ
=
=
=
=
=
π
=
=
π
=
=
φ
π
+
+
φ
+
π
=
02
.
0
R
1
cos
72
.
0
450
325
V
V
ma
V
8
.
1
V
W
62
.
1
f
Eoff
off
_
Psw
W
94
.
1
f
Eon
on
_
Psw
W
6
.
9
)
cos
3
ma
8
1
(
*
I
*
R
)
cos
ma
8
1
2
1
(
I
*
V
Pcond
CE
bus
pk
_
grid
CE
sw
sw
pk
2
CE
pk
CE
Where



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