1000 W dual stage DC-AC converter demonstration board
Features
■ Nominal input voltage: 24 V
■ Output voltage: 230 Vrms, 50 Hz
■ Output power: 1 kW
■ Efficiency: 90%
■ Switching frequency: 100 kHz (DC-DC); 16
kHz (DC-AC)
Description
The STEVAL-ISV001V1 demonstration board
implements a 1 kW dual stage DC-AC converter,
suitable for use in battery powered uninterruptible
power supplies (UPS) or photovoltaic (PV) stand
alone systems. The converter is powered from a
low DC input voltage varying from 20 V to 28 V
and is capable of supplying up to 1 kW output
power on a single phase AC load. These features
are met with a dual stage conversion topology
including an efficient step-up push-pull DC-DC
converter, to produce a regulated high voltage DC
bus, and a sinusoidal h-bridge PWM inverter to
generate a 50 Hz, 230 Vrms output sine wave.
Other relevant features of the proposed system
are high power density, high switching frequency,
galvanic isolation and efficiency greater than 90%
over a wide output load range.
STEVAL-ISV001V1
based on the STP160N75F3
Data Brief
STEVAL-ISV001V1
November 2008 Rev 1 1/6
For further information contact your local STMicroelectronics sales office.
www.st.com
6
Circuit schematics STEVAL-ISV001V1
GND
C3
1 Circuit schematics
Figure 1. Converter schematic: the power stage
VIN
C38
D1
D4
D2
D3
D13
R92
M1
R91
GATE A
R94
R95
C34 C35 C36
C53
R96
D14
R2
C7
R90 R87
GATE B
G H 1
S H1
G L1
V A
R88
Igbt1
1
Igbt4
M5
M6 M4
G H2
G L 2
T1
T2
R1
C8
V AC 2
R97
D15
Igbt2
Igbt3
2/6
AM00632v1
STEVAL-ISV001V1 Circuit schematics
_
_
Figure 2. Schematic of the push-pull control and driving circuit
VOUT
C11
R7
R9
R93
C16
C12
5u
1
2
3
4
5
6
7
8
U1
IN -
IN+
SYNC
OSC
CT
RT
DISCH
SS
SG3525
VREF
+VI
OUTB
VC
GND
OUTA
S.DOWN
COMP
+15V
16
15
14
PWM B
C10
+15V
PWM A
R20
Q9
2SD882
Q11
BC178B
13
12
11
PWM A
10
9
C14
Q10
BC107B
R21
Q12
BC178B
C17
0
PWM B
1n
+15V
GATE A
C18
+15V
C19
GATE B
0
AM00633v1
0
Figure 3. Inverter control driving circuit schematic
PWM LOW1/HIGH2
+15
C2
PWM LOW2/HIGH1
+15
C33
IC L6386
1
LIN
2
SD
3
HIN
4
VCC
5
DIAG
6
CIN
7
SG N
IC L6386
1
LIN
2
SD
3
HIN
4
VCC
DIAG 5NC
6
CIN
7
SGN
VBOOT
HVG
OUT
NC
NC
LV
GND
VBOOT
HVG
OUT
NC
LV
GND
R23
RG L1
R25
RG L 2
D6
RG H2
R24
D5
RG 1
R22
G H1
S H1
S L1
D7
D8
G H2
S H2
G L2
S L2
PWM LOW1/HIGH2
R9
PWM LOW2/HIGH1
PA5
PA6
RESET
C56
U1
18
PA0/LTI
17
PA1/ATI
16
PA2/ATPW
15
PA3/ATPW
14
PA4/ATPW
13
PA5/ATPWM3/ICCD
12
PA6/MCO/ICCCLK/BR
11
PA
20
OSC1/CLK
19
OSC
3
RESE
1
VS
ST7FLITE39
SOIC
C26
1
1
1
1
1
9
8
D9
0
C3
1
1
1
1
1
9
8
D10
0
PB0/SS/AI
PB1/SCK/AI
PB2/MISO/AI
PB3/MOSI/AI
PB4/CLKIN/AI
PB5/AIN
PB6/AIN
AM00634v1
5V
C57
2
VD
4
5
6
7
8
9
1
3/6
Circuit schematics STEVAL-ISV001V1
Figure 4. Schematic of the auxiliary power supply section
D12
C39
L3
150uH
U2
G
VIN
VOUT
N
L7805
2
SYN
COM
OU
IN
U1
+15V
C41
1
2
3
4
R81
C40
C5
D11
1
0
Vin
8
7
6
5
VC
GN
VRE
F
L5973D
R83
C51
+
+
C52
R82
C42
+
5V
Q8
3
C59
+15V
AM00635v1
4/6
STEVAL-ISV001V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
27-Nov-2008 1 Initial release.
5/6
STEVAL-ISV001V1
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