ST ISV003V1 User Manual
250 W microinverter for plug-in PV panels
Features
■ Input voltage range from 18 V to 45 V
■ Output voltage range from 110 V to 240 V AC,
50/60 Hz
■ Grid connection algorithm and MPPT capability
■ Digital control section managed by the STM32
■ Reactive power management
■ RS-232 for communication
■ RoHS compliant
Description
STEVAL-ISV003V1
demonstration board
Data brief
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.
An LED display provides a user-friendly interface
for the end user which allows monitoring and/or
modifying 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.
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, proportional to the grid voltage,
is used. The system can be connected to either a
50 Hz or 60 Hz network, depending on local
requirements. Finally, the RS-232 interface can be
used for serial data transfer of specified voltage,
current and current signals.
October 2011 Doc ID 022334 Rev 2 1/12
For further information contact your local STMicroelectronics sales office.
www.st.com
12
Schematics STEVAL-ISV003V1
1 Schematics
Figure 1. Isolated interleaved boost converter
0.02/0.5W
STB42N65M5
Q2
R21
27/0.25W
OUT AC 2
LOW FREQUENCYHIGH FREQUENCY
R2
D10
3.3/0.25W
STB42N65M5
Q4
R23
27/0.25W
R5
D15
3.3/0.25W
R14
SENS LE G2
Low f PWM High Side 2
D11
STPSC606
6A
600V
STPS3L40S
D6
Q1
STB42N65M5
DRAIN MO SFE T HIGH 1 DRAIN MOSFET HIGH 2
R19
27/0.25W
R1
D9
2.2uF, 250V
C13
12
D40
STPSC806G
6
D16
3.3/0.25W
High f PWM High Side 1
9
542
OUT AC 1
Vbus_SENS
R3
15M 1%
C11
22uF, 450V
C10
22uF, 450V
C9
22uF,450V
C8
22uF, 450V
C7
2.2uF, 630V
7
10
T3
TRAFO
1
3
FUNCTIONAL ISOLATION
Low f PWM Low Side 2
D34
STPSC606
D17
3.3/0.25W
High f PWM Low Side 1
R6
Q5
0.02/0.5W
R11
SENS LE G1
100k 1%
C12
2.2uF, 250V
D42
STPSC806G
STH180N10F3-2
D8
STPS3L40S
Q3
STB42N65M5
R20
27/0.25W
R4
D14
800uH 4A
L4 INDUCTOR
Magnetica
1
VINPUT
2
J1
CON_ PV
2/12 Doc ID 022334 Rev 2
R9 27/ 0.2 5W
2.7/0.25W
D21 R7
D23
Schottky
Gate 2
800uH 4A
Magnetica
L6 INDUCTOR
1uF, 100V
C19
1uF, 100V
C18
C17
1uF, 100V
C16
1uF, 100V
C15
1uF, 100V
STH180N10F3-2
Q7
R12 27/0.25W
2.7/0.25W
D22 R8
D24
1uF, 100V
Schottky
Gate 1
C24
C22
1uF, 100V
C23
1uF, 100V
1uF, 100V
C21
I_SE NS _PV
R10
150k 1%
C20
1uF, 100V
R18
10k 1%
VIN_SENS_PV
C28
1uF, 100V
C27
1uF, 100V
1uF, 100V
C26
C25
1uF, 100V
R22
10 mOhm 1W 1%
AM10192V1
STEVAL-ISV003V1 Schematics
AM10193V1
AM10194V1
Figure 2. Power supply section - 15 V
C135
2.7nF
C78
10nF
R39
24k
5
3
7
VINPUT
PANASONIC
EEEFK1J151AQ
C137
150uF,63V
C138
220nF
C136
2.7nF
R38
20k
C80
120pF
Figure 3. Power supply section - 5 V
C141
2.7nF
5
3
7
C142
10nF
R75
24k
VINPUT
PANASONIC
EEEFK1J151AQ
C147
150uF,63V
C146
220nF
C145
2.7nF
R71
20k
C143
120pF
U1
Vcc
Osc
Comp
1
Vcc
Osc
Comp
GND
1
GND
2
100nF
SS/INH
2
C77
100nF
SS/INH
C140
Coilcraft
OUT
4
MSS1278-224
L15
Vcc15V
2
D31
1
Vfb
Boot
L4971
6
8
STPS3L60U
R42
56.2K, 1%
C83
220uF, 25V
PANASONIC
EEEFC1E221P
C139
100nF
R40
16K, 1%
AM10193V1
CoilcraftU2
4
OUT
Vfb
Boot
L4971
8
6
C148
100nF
MSS1278-224
L17
D32
1 2
STPS3L60U
R78
2.7K, 1%
R77
4.7K, 1%
Vcc5V
C144
220uF, 25V
PANASONIC
EEEFC1E221P
Figure 4. DC/DC drive selection
R44
PWM1
PWM2
3.3 ohm
R46
3.3 ohm
IC3
1
2
3
4
ENB1
PWM1
GND
PWM2
ENB2
OUT1
VCC
OUT2
8
7
6
5
Gate 1
Gate 2
PM8834
C60
Vcc15V
10u 25V
LOW SIDE MOSFET DRIVER
Doc ID 022334 Rev 2 3/12
Schematics STEVAL-ISV003V1
Figure 5. V-bus sensing
ADC_BU S_VOLTAGE
100n 50V
C76
1
R131
59k 1%
150p 25V
C74
3V3
U13A3
TS27 2
+
-
4 8
3
2
6
5
7
NC8NC
PD2 A
PD2 K
LED K1LED A2PD1 K
U21
R130
120
C69
100n 50V
5Visol
PD1 A
HCNR200-300
4
3
Q10
2STN2340
1k 1%
R129
C71
100n 50V
1
U13A2
TS27 2
+
-
4 8
3
2
4/12 Doc ID 022334 Rev 2
R128
86.6k 1%
Vbus_SENS
AM10196v1
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