STEVAL-ISV003V1
250 W microinverter for plug-in PV panels demonstration board
Data brief
Features
■
Input voltage range from 20 V to 40 V
■
Output voltage 230 V AC, 50 Hz
■
Grid connection algorithm and MPPT capability
■
Digital control section managed by the STM32
■
Reactive power management
■
RS-232 for communication
■
RoHS compliant
Description
The STEVAL-ISV003V1 is a demonstration board
which implements the microinverter concept and
is designed to optimize the power production of
each single solar panel by means of DC-AC
conversion. The conversion system is capable of
both grid synchronization and maximum power
point tracking (MPPT) thanks to the use of an
advanced control algorithm implemented in the
32-bit STM32 microcontroller. The MPPT function
is based on the perturb and observe (P & O)
concept which seeks the best operating point of
the panel, thus maximizing the energy produced
under any environmental condition. The grid
synchronization algorithm has the advantage over
standard solutions of a decoupled control of
active and reactive power. The STEVALISV003V1 demonstration board uses a highfrequency (HF) isolated DC-DC converter with
interleaved current and an optimized full-bridge
DC-AC inverter. The typical solar panel voltage is
first stepped up to about 400 V and then
converted into AC to create a sinusoidal output.
STEVAL-ISV003V1
In open-loop mode the sinusoidal reference is
created internally by means of a standard lookup
table, while in closed-loop mode, a sinusoidal
voltage feedback which is proportional to the grid
voltage is used. This system can be connected to
a 50 Hz network (STEVAL-ISV003V1) and to a 60
Hz network (STEVAL-ISV003V2), based on local
requirements. The RS-232 interface can be used
for serial data transfer of specified voltage, current
and current signals.
An LED display provides a user-friendly interface
for the end user which allows the monitoring
and/or modifying of some of the main operating
parameters. Two modes of operation are available
and can be selected to allow either open-loop
operation or closed-loop operation in
synchronization with the grid.
November 2012
Doc ID 022334 Rev 3
For further information contact your local STMicroelectronics sales office.
1/12
www.st.com
12
2/12
Doc ID 022334 Rev 3
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Schematic diagrams
STEVAL-ISV003V1
Schematic diagrams
Isolated interleaved boost converter
!-V
STEVAL-ISV003V1
Figure 2.
Schematic diagrams
Power supply section - 15 V
U1
5
3
Vcc
Osc
C138
220nF
C136
2.7nF
C80
120pF
Boot
Vfb
C78
10nF
R42
56.2K, 1%
C83
220uF, 25V
PANASONIC
EEEFC1E221P
C139
100nF
C77
100nF
R39
24k
D31
1 STPS3L60U
L4971
6
1
2.7nF
Vcc15V
L15
2
SS/INH
GND
7 Comp
C135
4
OUT
8
R38
20k
2
VINPUT
PANASONIC
EEEFK1J151AQ
C137
150uF,63V
Coilcraft
MSS1278-224
R40
16K, 1%
AM10193V1
Figure 3.
Power supply section - 5 V
U2
Vcc
Osc
C146
220nF
C145
2.7nF
C143
120pF
C140
R75
24k
100nF
Boot
Vfb
C142
10nF
6
1
2
C141
2.7nF
GND
7 Comp
C147
150uF,63V
Vcc5V
L17
2
OUT
8
R71
20k
SS/INH
VINPUT
PANASONIC
EEEFK1J151AQ
Coilcraft
MSS1278-224
4
1
5
3
L4971
D32
STPS3L60U
R78
2.7K, 1%
C144
220uF, 25V
PANASONIC
EEEFC1E221P
C148
100nF
R77
4.7K, 1%
AM10193V1
Figure 4.
DC-DC drive section
IC3
R44
PWM1
330 ohm
R46
1
2
3
4
ENB1
PWM1
GND
PWM2
ENB2
OUT1
VCC
OUT2
8
7
6
5
Gate 1
Gate 2
PWM2
330 ohm
PM8834
C60
Vcc15V
10uF 25V
AM10194V1
Doc ID 022334 Rev 3
3/12
Schematic diagrams
Figure 5.
STEVAL-ISV003V1
5 V isolated
Vcc 15V
DCDC L5
NMV1505SAC
1
0
5V
5Visol
Gnd
Vcc15V
2
5
7
C56
100n 25V
C55
100n 15V
C53
1u 25V
AM10197V1
Figure 6.
PV voltage sensing section
R100
1k
5Vcc
C84
100n
IC11
ADC_PANEL_VOLTAGE
1
2
3
4
OUT1
Vcc+
In1-
OUT2
In1+
In2-
Vcc-
In2+
8
R101
10k 0.1%
R102
10k 0.1%
7
6
5
R103
3.3k 1%
TSV992
VIN_SENS_PV
C85
10n
AM10198V1
4/12
Doc ID 022334 Rev 3
Doc ID 022334 Rev 3
C36
10uF 25V
RELAY _GRID
R27
470
330
R36
AC_NEUT
R29
10k 1%
Q9
2N7002
OUT AC 1
G5LE-1A4-DC12
3
1
D29
STPS2L25U
2
5
RL1
C31
OUT AC 2
R28
8.2
5W
470nF, 275VAC
I-
Magnetica 2196.0001
L13
I+
Magnetica 2196.0001
L14
1
4
C34
2.2n, 300VAC
EARTH GROUND
N.C.
R26
C29
2.2n, 300VAC
T1
BU10-6003R0BL
10mH
Coilcraf t
2
3
C33
2.2n, 300VAC
N.C.
C30
2.2n, 300VAC
R25
2
1
2
1
SC3
TMOV14RP250E
SC1
TMOV14RP250E
FUSE 2A
F1
2
1
SC2
V275LA20A
CON GRID
J2
NEUTRAL_sens
1
2
L1_sens
Figure 7.
Vcc15V
STEVAL-ISV003V1
Schematic diagrams
Output AC line filter
AM10200V1
5/12
Schematic diagrams
Figure 8.
STEVAL-ISV003V1
Output current sensor
5Vcc
IC1
Vs(+)
5
I+
4
I-
PRI Iin GND (-)
OUT
1
2
C35
100n
3
PRI Iout
HONEY WELL
CSLW6B5
R30
Iout_sens
1k 1%
C37
22n
AM10201V1
Figure 9.
AC line current sensing
R88
10K
5Vcc
R90
R92 10K 0.1%
100nF
4k7 0.1%
IC9
1
2
Iout_sens
AC LINE CURRENT SENSOR
3
4
OUT1
Vcc+
In1-
OUT2
In1+
In2-
Vcc-
In2+
8
C79
R94 560
7
AC_Line current
6
5
R96
1.1k
TSV992
AM10202V1
6/12
Doc ID 022334 Rev 3
,WDFRLO69/
7
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5
Doc ID 022334 Rev 3
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STEVAL-ISV003V1
Schematic diagrams
Figure 10. VOUT sensing section
!-6
7/12
R105 0
3
2
1
3
2
1
GND
GND
3V3
R104
10k
J14
GND
3
2
1
3V3
C91
10pF
GND
PB13
PWM3
TX_0
RX_0
TDO/SWO
TRST
GND
GND
R107 10k
Doc ID 022334 Rev 3
10k
R118
390
R115
NRST
OSC_OUT
OSC_IN
BOOT0
NOT CONNECTED
GNDGNDGNDGNDGND
C113C114C115C116C117
180p180p180p180p
130
120
94
83
61
51
16
38
143
107
71
3V3
GND
C120C121C122C123C124
100nF 100nF 100nF 100nF 100nF
3V3
GND
C107C108C109C110C111C112
VDDA
72
108
144
39
17
52
62
84
95
121
131
100nF 100nF 100nF 100nF 100nF
100nF
GND
C118
10nF
30
GND
GND
L16
3V3
R121
47
BLM41PG600SN1L
C119
10uF
GND
31
180p
VSS_11
VSS_10
VSS_9
VSS_8
VSS_7
VSS_6
VSS_5
VSS_4
VSS_3
VSS_2
VSS_1
32
GNDGNDGNDGNDGNDGND
VDD_11
VDD_10
VDD_9
VDD_8
VDD_7
VDD_6
VDD_5
VDD_4
VDD_3
VDD_2
VDD_1
180p
3V3
VDD_A
3V3
VREF-
GND
STM32F103ZET6
VSS_A
6
180p180p180p180p
3V3
25
24
23
138
106
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PC8
PC9
PC10
PC11
PC12
PC13-ANTI_TAMP
PC14-OSC32_IN
PC15-OSC32_OUT
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15
PA0-WKUP
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15
GND
C98
10nF
VBAT
C101C102C103C104C105C106
180p
GND
C94
OSCOUT
OSCIN
ADC123_IN10
ADC123_IN11
ADC123_IN12
ADC123_IN13
ADC12_IN14
RESET#
PC12
PC13
PC0
PC1
PC2
PC3
PC4
PB10 LDAC (DAC)
PB11 SY NC (DAC)
PB12 ENABLE (DAC)
TIM1_CH1N
PB5
PB6 USART1_TX
PB7 USART1_RX
TIM4_CH3_LEG1
ADC12_IN15
TIM8_CH1
TIM8_CH2
TIM8 CH3
TIM8 CH4
Y2
180pF
PB0 TIM3_CH3
PB1 TIM8_CH3N
PB2 BOOT1
26
27
28
29
44
45
96
97
98
99
111
112
113
7
8
9
46
47
48
133
134
135
136
137
139
140
69
70
73
74
75
76
PA13 JTAG
PA14 JTAG
PA15 JTAG
PA10
PA6
PA7 SPI1_MOSI
TIM1_CH1_LEG2
PA4
U20
VREF+
RESET
3V3
C93
8Mhz
22pF
C92
22pF
PC5
PC6
PC7
PC8
PC9
A0_DAC
A1_DAC
PC12
PC13
LDAC (DAC)
SY NC (DAC)
ENABLE (DAC)
PB5
PWM2
PB1
TMS/SWDIO
TCK/SWCLK
TDI
PA10
PWM4
PWM1
AC_Line current
AC_Line v oltage
ADC_PANEL_CURRENT
ADC_PANEL_VOLTAGE
ADC_BUS_VOLTAGE
PC5
PC6
PC7
PC8
PC9
R106 0
PC15 OSC32_OUT
3
2
1
3V3
GND
DATA IN (DAC)
SCLK (DAC)
RELAY _GRID
JUMPER_3
C90
10pF
2
1
CON3
J13
Y1
32.768Khz
J12
GND
PA2 TIM5_CH3
PA3 TIM5_CH4
PC14 OSC32_IN
JUMPER_3
CON3
J16
1
34
35
36
37
40
41
42
43
100
101
102
103
104
105
109
110
3V3
PD15
PD14
PD13
PD12
PD11
PD10
PD9
PD8
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
PE15
PE14
PE13
PE12
PE11
PE10
PE9
PE8
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
PF15
PF14
PF13
PF12
PF11
PF10
PF9
PF8
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0
PG15
PG14
PG13
PG12
PG11
PG10
PG9
PG8
PG7
PG6
PG5
PG4
PG3
PG2
PG1
PG0
86
85
82
81
80
79
78
77
123
122
119
118
117
116
115
114
68
67
66
65
64
63
60
59
58
5
4
3
2
1
142
141
55
54
53
50
49
22
21
20
19
18
15
14
13
12
11
10
132
129
128
127
126
125
124
93
92
91
90
89
88
87
57
56
FSMC_NWE
FSMC_NOE
KEY -DOWN
PD1
PD0
D3
D2
D15
D14
D13
PD10
PD9
PD8
D12
D11
D10
D9
D8
D7
D6
D5
D4
D[0..15]
D1
D0
PE3
PE2
PE1
PE0
A0
USER_BUTTON
KEY -CENTER
KEY -UP
KEY -LEFT
KEY -RIGHT
FSMC_NE4
PD15
PD14
PE7
PF0
PG0
PD5 FSMC-NWE
PD4 FSMC-NOE
PD3 KEY -DOWN
PE3
PE2
PE1
PE0
PG0
PG8 USER-BUTTON
PG7 KEY -CENTER
PG15 KEY -UP
PG14 KEY -LEFT
PG13 KEY -RIGHT
PG12 FSMC_NE4
D[0-15]
2
8/12
PA0 TIM2_CH1
PA1 RELAY -GRID
Schematic diagrams
STEVAL-ISV003V1
Figure 11. 32 bit MCU-STM32F electrical schematic
D[0-15]
33
AM10204V1
DCDC L3
Gnd
Vcc
1
C5
100nF 25V
2
15 V
0
Gnd
Vcc
I2_Vcc15V
C14
1uF 25V
C40
1u 25V
PWM3
330
R16
330
R13
1
4
3
2
4
3
2
1
1
Doc ID 022334 Rev 3
HCPL 4506
NC
CATHODE
VO
VL
VCC
5
6
7
8
GND
GND
VO
VL
VCC
ANODE
NC
IC7
HCPL 4506
NC
CATHODE
ANODE
NC
IC12
5
6
7
8
I2_Vcc15V
1
C4
100nF 15V
5
NMV0515SA
C43
100nF 25V
PWM4
I1_Vcc15V
2
Vcc5V
0
DCDC L2
NMV0515SA
15 V
C42
100nF 15V
Vcc5V
I1_Vcc15V
2
C63
0.1uF 50V
D12
5.1V 500mW
R15
10k
D13
5.1V 500mW
R17
10k
20k, 1%
R49
C57
0.1uF 50V
R54
10k, 1%
R53
100k, 1%
R47
10k, 1%
R45
100k, 1%
R70
20k, 1%
R55
200k, 1%
R48
200k, 1%
L6390
GND
GND
C64
0.1uF 50V
8
STTH108
OP+
*LIN VBOOT
*SD/ODHVG
HIN
OUT
Vcc
NC
DT
NC
OPLVG
OPOUT CP+
L6390
U4
1
2
3
4
5
6
7
D36
OP+
*LIN VBOOT
*SD/ODHVG
HIN
OUT
Vcc
NC
DT
NC
OPLVG
OPOUT CP+
STTH108
C59
0.1uF 50V
8
U3
1
2
3
4
5
6
7
HIGH FREQUENCY
D35
9
9
16
15
14
13
12
11
10
16
15
14
13
12
11
10
SENS LEG2
SENS LEG1
LOW FREQUENCY
10k 1%
R51
C61 22uF 25V
C150
47uF 25V
10k 1%
R43
C54
1uF 25V
C149
47uF 25V
R56
330 ohm
I2_Vcc15V
OUT AC 2
330 ohm
R52
330 ohm
R50
I1_Vcc15V
OUT AC 1
330 ohm
R41
PM8834
ENB1
PWM1
GND
PWM2
IC4
PM8834
ENB1
PWM1
GND
PWM2
IC2
PM8834
ENB1
PWM1
GND
PWM2
IC6
PM8834
ENB1
PWM1
GND
PWM2
IC5
C58
ENB2
OUT1
VCC
OUT2
8
7
6
5
8
7
6
5
10uF 25V
C66
ENB2
OUT1
VCC
OUT2
10uF 25V
C65
ENB2
OUT1
VCC
OUT2
10uF 25V
C62
ENB2
OUT1
VCC
OUT2
10uF 25V
SENS LEG2
1
2
3
4
1
2
3
4
SENS LEG1
1
2
3
4
1
2
3
4
8
7
6
5
8
7
6
5
Low f PWM Low Side 2
Low f PWM High Side 2
High f PWM Low Side 1
High f PWM High Side 1
DC-AC Drive section
STEVAL-ISV003V1
Schematic diagrams
Figure 12. DC-AC section driver
1
3
5
3
2
AM12053V1
9/12
Schematic diagrams
STEVAL-ISV003V1
Figure 13. PV current sensing section
Vcc5V
C81 100nF
C82
IC10
R95
I_SENS_PV
R97
1k 0.1%
1
30K 0.1%
2
3
4
OUT1
Vcc+
In1-
OUT2
In1+
In2-
Vcc-
In2+
8
100nF
ADC_PANEL_CURRENT
7
6
R98
5
1k
TS912
AM12052V1
10/12
Doc ID 022334 Rev 3
STEVAL-ISV003V1
2
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
Changes
07-Oct-2011
1
Initial release.
11-Oct-2011
2
Minor text changes on cover page.
12-Nov-2012
3
– Added: Figure 12 and 13
– Minor text changes throughout the document.
Doc ID 022334 Rev 3
11/12
STEVAL-ISV003V1
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