Tiduf64 - TIDA-010938 - 7.2-KW, GaN-based Single-Phase String Inverter With Battery Energy Stor
Tiduf64 - TIDA-010938 - 7.2-KW, GaN-based Single-Phase String Inverter With Battery Energy Stor
Tiduf64 - TIDA-010938 - 7.2-KW, GaN-based Single-Phase String Inverter With Battery Energy Stor
com Description
Description Features
This reference design provides an overview into the • Bidirectional DC-DC stage configurable for wide
implementation of a GaN-based single-phase string battery voltage ranges
inverter with bidirectional power conversion system for • Configurable DC-AC stage (HERIC, H-Bridge uni-
Battery Energy Storage Systems (BESS). The design and bi-polar modulation schemes)
consists of two string inputs, each able to handle up to • 2 × power density improvement makes solar
10 photovoltaic (PV) panels in series and one energy inverters lighter and easier to install
storage system port that can handle battery stacks • Low total losses (< 2%) harnesses more sun and
ranging from 80 V to 500 V. The rated power from makes battery energy storage more efficient
string inputs to battery storage systems is up to 7.2 • Cost-optimized with MCU GND referenced to
kW. The configurable DC-AC converter can support VDC–, allows use of non-isolated drive on all GaN
up to 3.6 kW into a single-phase grid connection at devices connected to VDC–
230 V. Digital control of the three power stages is
executed on a single C2000™ MCU.
Applications
• String inverter
Resources • Power conversion system (PCS)
TIDA-010938 Design Folder
LMG3522R030, TMCS1123 Product Folder
AMC1302, ISOW1044 Product Folder
ISO1412, UCC14131-Q1 Product Folder
ISO7741, ISO7762 Product Folder
OPA4388, INA181 Product Folder
TMDSCNCD280039C Product Folder
PWM1 Q1
I-Sensor I-Sensor
VN I-Sensor
I-Sensor Q10 Q11
Q2 Q4
+ VBAT
INA181 PWM2 PWM4
VDDMCU IA IC TMCS1123
- AMC1302 PWM6 Q6 Q7 IPH
IA,B,C,D,PH feedback IB AMC1302 PWM7
VDC- IB’ IC’ I-Sensor
F280039 VPV, VDC+ , VDC-, GNDDC-
Digital Control VBAT, VL1, VN feedback
MCU PWM 1,2,3,4,5,6,7,8,9
INA181
GNDMCU = GNDDC- ID
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1 System Description
With an increase in demand for photovoltaic systems, inverters play an important role in facilitating the transition
to renewable energy further and making solar energy more accessible for residential purposes. The modularity
of string inverters, low cost-per-watt and easy amplification to attain higher power levels makes string inverters a
good candidate for the single-phase market. With the additional possibility of energy storage via batteries, hybrid
string inverters provide a good outlet to maximize the power utilization of the string input, and also provide an
alternate pathway to supply the grid during night or low irradiance scenarios.
Such hybrid string inverters combine PV panel power point tracking with an inverter stage and bidirectional
capabilities to include a battery stage, thus increasing the need for higher power density and efficiencies. This
is where Gallium Nitrate (GaN) FETs can bring multiple benefits into the picture. Since GaN FETs support high
switching frequencies, GaN FETs allow the EMI filter and heat sink to be smaller, making the system more
compact and lighter, thus increasing the form factor of the design.
This reference design is intended to show an implementation of a two-channel single-phase string inverter with
fully bidirectional power flow to combine PV input functionality with BESS supporting a wide range of battery
voltages.
The design contains three main stages:
• 2 × PV input with DC-DC boost converter
• Battery input with bidirectional DC-DC converter
• DC-AC converter
This system consists of two boards that are split by different functions.
The first board, called DC-DC board, consists of two input DC-DC converters for the individual string inputs
and a DC-DC converter associated with the battery stage. The second board, called DC-AC board, consists of
DC-link capacitors, DC-AC converter and filtering circuits. All the high-frequency switching components in the
design are based on top-side cooled GaN FETs from TI .
Both the boards are mounted above an aluminum heat sink which is connected by means of thermal interface
materials to the GaN FETs. The heat sink in the design is supposed to work in static cooling condition and the
size is 324 mm × 305 mm × 57 mm. Overall system dimension is 290 mm × 275 mm × 47 mm, thus leading to a
volume of 3.7 liters.
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CAUTION
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WARNING
High voltage! Accessible high voltages are present on the board. Electric shock is possible. The board
operates at voltages and currents that can cause shock, fire, or injury if not properly handled. Use the
equipment with necessary caution and appropriate safeguards to avoid injuring yourself or damaging
property. For safety, use of isolated test equipment with overvoltage and overcurrent protection is highly
recommended.
TI considers it the user's responsibility to confirm that the voltages and isolation requirements are
identified and understood before energizing the board or simulation. When energized, do not touch the
design or components connected to the design.
WARNING
Some components can reach high temperatures > 55°C when the board is powered on. Do not touch the
board at any point during operation or immediately after operating, as high temperatures can be present.
WARNING
TI intends this reference design to be operated in a lab environment only and does not consider the
design as a finished product for general consumer use. The design is intended to be run at ambient
room temperature and is not tested for operation under other ambient temperatures.
! TI intends this reference design to be used only by qualified engineers and technicians familiar
with risks associated with handling high-voltage electrical and mechanical components, systems, and
subsystems.
There are accessible high voltages present on the board. The board operates at voltages and currents
that can cause shock, fire, or injury if not properly handled or applied. Use the equipment with necessary
caution and appropriate safeguards to avoid injuring yourself or damaging property.
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2 System Overview
EMI Filter
PWM1 Q1
I-Sensor I-Sensor
VN I-Sensor
I-Sensor Q10 Q11
Q2 Q4
+ VBAT
INA181 PWM2 PWM4
VDDMCU IA IC TMCS1123
- AMC1302 PWM6 Q6 Q7 IPH
IA,B,C,D,PH feedback IB AMC1302 PWM7
VDC- IB’ IC’ I-Sensor
F280039 VPV, VDC+ , VDC-, GNDDC-
Digital Control VBAT, VL1, VN feedback
MCU PWM 1,2,3,4,5,6,7,8,9
INA181
GNDMCU = GNDDC- ID
0 μF
PWM1 Q1
I-Sensor DC BUS-
GND
INA181
Each string can consist of 2 to 10 panels in series equating to an input voltage of 50 V to 500 V maximum,
considering a panel is nominally 50-V rated. Both the converters are 3.6-kW rated, with an ability to provide a
total output power of 7.2 kW.
The boost stages each consist of an LMG3522R030 device in combination with a SiC diode, a boost inductor
145451 (D6754) which has a value of 160 μH, and input capacitor for filtering and a common output capacitor to
minimize the output ripple voltage. By means of PLECs simulations, it was found that the LMG3522R030 30-mΩ
device provides a good trade-off between conduction losses (coming from the RDS(on)) and switching losses
(coming from the output parasitic capacitance). To achieve a high efficiency for the rectification stage, the SiC
Schottky diode C6D20065G is used which is 650 V and 20-A rated.
In this application, the duty-cycle of the boost converter is variable and depends on the input string voltage since
the DC link voltage is kept constant. The GaN FETs are switched at frequencies of 120 kHz each.
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Q3 PWM3 Q5 PWM5
I-Sensor
I-Sensor
+ Q2 Q4
VBAT
PWM2 PWM4
IC
240 V AMC1302
IB AMC1302
IB’ IC’ DC BUS-
-
In boost mode, since this converter supplies the inverter through the DC link, the discharge current is limited
to 30 A. In the boost mode as well, there is a possibility to employ a charging current of 30 A to reach higher
power levels. As a result, this leads to higher conduction and switching losses of the FETs, so interleaving of
the branches can be carried out. Paralleling of the branches also aids in achieving twice the switching frequency
across the output EMI filter which helps reduce the size. A phase difference of 360° / 2 equals 180° is applied
between the legs to reduce ripple current. The same current is demanded from both the branches leading to 2 ×
output current and the duty cycle is fixed depending on the battery voltage and the DC link voltage. Furthermore,
a dead time is inserted between the half-bridge FETs to avoid short circuit of current paths, while the switches
switch in a complementary fashion. Both the interleaved stages have individual input capacitor and Bourns
inductor 145452 (D6755) which is 186-μH rated, and a common output capacitor to minimize the output ripple
voltage. All the passive components are designed to match the requirements for worst-case ripple and EMI
conditions.
This design is therefore rated to provide a 3.6-kW output for buck stage and has a capability to charge the
battery up to 7.2 kW. Each interleaved stage is switched at a frequency of 60 kHz, resulting in an equivalent
output frequency of 120 kHz.
2.2.3 DC-AC Converter
Figure 2-4 shows a block diagram for the DC-AC stage. The inverter stage is responsible for converting DC
power to AC power. The topology is constituted by an H-Bridge with each group of diagonal switches operating
at high frequency during one half-wave of output voltage. Additional switches placed in parallel to the grid allows
an additional voltage-level across the output filter making this power conversion system a three-level topology.
This enables constant common-mode voltage leading to negligible leakage current since the PV input stage is
decoupled from the AC grid in the freewheeling phase.
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PWM8 Q8 PWM9 Q9
VL1
EMI Filter
VN I-Sensor
Q10 Q11
TMCS1123
PWM6 Q6 Q7 IPH
PWM7
I-Sensor
DC BUS-
INA181
ID
This topology is an excellent choice for such transformerless string inverter applications where there is no
isolation available between the AC grid and the PV panels. The common-mode currents are a well-known
challenge in PV applications due to PV surfaces exposed over grounded roof or other surfaces in the proximity.
The large surface areas can lead to high values of stray capacitance between the PV panel and ground, which
can go as high as 200 nF / kWp in damp environments or on rainy days. This parasitic capacitance can cause
high common-mode current flowing into the system when common-mode voltage of the converters is not well
mitigated and can lead to EMI and issues such as grid current distortion.
This converter is operated at 100-kHz switching frequency for sinusoidal grid current control, allowing the EMI
filter design to be compact. With the 230-V grid, an output power of 3.6 kW can be achieved with an output
current of 15.6 ARMS. The EMI filter is composed of a boost inductor split between both rails, two common-mode
chokes, Cx capacitors, and Cy capacitors. The EMI filter has been designed to attenuate both the differential-
mode and common-mode noise injected into the grid. Additionally, electrolytic capacitors are present at the DC
link to compensate for the power ripple present in such single-phase applications. For this application, the boost
inductor chosen is Bourns 145453 (D6743) which is around 96 μH in value with a DC resistance of 30 mΩ. For
the electrolytic capacitors, a combination of four of ALH82D161DD600 in parallel is considered, where each one
is 160-μF rated leading to a total capacitance of 640 μF.
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kVRMS. The isolation barrier separates parts of the system that operate on different common-mode voltage levels
and protects the low-voltage side from hazardous voltages and damage. The input of the AMC1302 is optimized
for direct connection to a low-impedance shunt resistor or other low-impedance voltage source with low signal
levels. The excellent DC accuracy and low temperature drift supports accurate current control in PFC stages,
DC/DC converters, AC-motor and servo drives over the extended industrial temperature range from –40°C to
+125°C. The integrated missing-shunt and missing high-side supply detection features simplify system-level
design and diagnostics.
For more details on this device, see the AMC1302 product page.
2.3.5 ISO7741 Robust EMC, Quad-channel, 3 Forward, 1 Reverse, Reinforced Digital Isolator
The ISO7741 device is a high-performance, quad-channel digital isolator with 5000 VRMS (DW package) and
3000 VRMS (DBQ package) isolation ratings per UL 1577. The family includes devices with reinforced insulation
ratings according to VDE, CSA, TUV, and CQC. The ISO7741B device is designed for applications that require
basic insulation ratings only. The ISO774x devices provide high electromagnetic immunity and low emissions at
low power consumption, while isolating CMOS or LVCMOS digital I/Os. Each isolation channel has a logic input
and output buffer separated by a double capacitive silicon dioxide (SiO2) insulation barrier. These devices come
with enable pins which can be used to put the respective outputs in high impedance for multi-master driving
applications and to reduce power consumption. The ISO7740 device has all four channels in the same direction,
the ISO7741 device has three forward channels and one reverse-direction channel, and the ISO7742 device has
two forward and two reverse-direction channels.
For more details on this device, see the ISO7741 product page.
2.3.6 ISO7762 Robust EMC, Six-Channel, 4 Forward, 2 Reverse, Reinforced Digital Isolator
The ISO7762 device is a high-performance, six-channel digital isolator with 5000-VRMS (DW package) and
3000-VRMS (DBQ package) isolation ratings per UL 1577. The family of devices is also certified according to
VDE, CSA, TUV, and CQC. The ISO776x family of devices provides high electromagnetic immunity and low
emissions at low-power consumption, while isolating CMOS or LVCMOS digital I/Os. Each isolation channel has
a logic-input and logic-output buffer separated by a double capacitive silicon dioxide (SiO2) insulation barrier.
The ISO776x family of devices is available in all possible pin configurations such that all six channels are in
the same direction, or one, two, or three channels are in reverse direction while the remaining channels are in
forward direction.
For more details on this device, see the ISO7762 product page.
2.3.7 UCC14131-Q1 Automotive, 1.5-W, 12-V to 15-V VIN, 12-V to 15-V VOUT, High-Density > 5-kVRMS
Isolated DC/DC Module
UCC14131-Q1 is an automotive qualified high-isolation voltage DC/DC power module designed to provide power
to GaN, IGBT, SiC, or Si gate drivers. The UCC14131-Q1 integrates a transformer and DC/DC controller with a
proprietary architecture to achieve high efficiency with very low emissions. The device can provide an isolated
12-V output from a 12-V regulated input for driving GaN and Si MOSFETs; and an isolated 15-V or 18-V output
from a 15-V regulated input to bias the driver circuit for SiC MOSFET or IGBTs. The high-accuracy provides
better channel enhancement for higher system efficiency without over-stressing the power device gate. The
UCC14131-Q1 provides up to 1.5 W (typical) of isolated output power at high efficiency. Requiring a minimum of
external components and including on-chip device protection, the module provides extra features such as input
undervoltage lockout, overvoltage lockout, output voltage power-good comparators, overtemperature shutdown,
soft-start time-out, adjustable isolated positive and negative output voltage, an enable pin, and an open-drain
output power-good pin.
For more details on this device, see the UCC14131-Q1 product page.
2.3.8 ISOW1044 Low-Emissions, 5-kVRMS Isolated CAN FD Transceiver With Integrated DC/DC Power
The ISOW1044 device is a galvanically-isolated controller area network (CAN) transceiver with a built-in isolated
DC-DC converter that eliminates the need for a separate isolated power supply in space-constrained isolated
designs. The low-emissions, isolated DC-DC meets CISPR 32 radiated emissions Class B standard with just two
ferrite beads on a simple two-layer PCB. Additional 20-mA output current can be used to power other circuits on
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the board. An integrated 10Mbps GPIO channel is available and can help remove an additional digital isolator or
optocoupler for diagnostics, LED indication or supply monitoring.
For more details on this device, see the ISOW1044 product page.
2.3.9 ISOW1412 Low-Emissions, 500kbps, Reinforced Isolated RS-485, RS-422 Transceiver With
Integrated Power
The ISOW1412 device is a galvanically-isolated RS-485, RS-422 transceiver with a built-in isolated DC-DC
converter, that eliminates the need for a separate isolated power supply in space-constrained isolated designs.
The low-emissions, isolated DC-DC converter meets CISPR 32 radiated emissions Class B standard with just
two ferrite beads on a simple two-layer PCB. Additional 20-mA output current can be used to power other circuits
on the board. An integrated 2Mbps GPIO channel helps remove any additional digital isolator or optocoupler for
diagnostics, LED indication, or supply monitoring.
For more details on this device, see the ISOW1412 product page.
2.3.10 OPA4388 Quad, 10-MHz, CMOS, Zero-Drift, Zero-Crossover, True RRIO Precision Operational
Amplifier
The OPA4388 precision operational amplifier is an ultra-low noise, fast-settling, zero-drift, zero-crossover device
that provides rail-to-rail input and output operation. These features and excellent AC performance, combined
with only 0.25 µV of offset and 0.005 µV / °C of drift over temperature, makes the OPA4388 a great choice
for driving high-precision, analog-to digital converters (ADCs) or buffering the output of high-resolution, digital-to-
analog converters (DACs). This design results in excellent performance when driving analog-to-digital converters
(ADCs) without degradation of linearity. The OPA388 (single version) is available in the VSSOP-8, SOT23-5, and
SOIC-8 packages. The OPA2388 (dual version) is offered in the VSSOP-8 and SO-8 packages. The OPA4388
(quad version) is offered in the TSSOP-14 and SO-14 packages. All versions are specified over the industrial
temperature range of –40°C to +125°C.
For more details on this device, see the OPA4388 product page.
2.3.11 OPA2388 Dual, 10-MHz, CMOS, Zero-Drift, Zero-Crossover, True RRIO Precision Operational
Amplifier
The OPA2388 is a precision operational amplifier that is an ultra-low noise, fast-settling, zero-drift, zero-
crossover device that provides rail-to-rail input and output operation. These features and excellent AC
performance, combined with only 0.25 µV of offset and 0.005 µV / °C of drift over temperature, makes the
OPA2388 a great choice for driving high-precision, analog-to digital converters (ADCs) or buffering the output of
high-resolution, digital-to-analog converters (DACs). This design results in excellent performance when driving
analog-to-digital converters (ADCs) without degradation of linearity. The OPA388 (single version) is available in
the VSSOP-8, SOT23-5, and SOIC-8 packages. The OPA2388 (dual version) is offered in the VSSOP-8 and
SO-8 packages. The OPA4388 (quad version) is offered in the TSSOP-14 and SO-14 packages. All versions are
specified over the industrial temperature range of –40°C to +125°C.
For more details on this device, see the OPA2388 product page.
2.3.12 INA181 26-V Bidirectional 350-kHz Current-Sense Amplifier
The INA181 is a current sense amplifier that is designed for cost-optimized applications. This device is a part of
a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops
across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply
voltage. The INAx181 family integrates a matched resistor gain network in four, fixed-gain device options: 20
V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the
temperature drift. These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181
draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply
current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA. The INA181 is
available in a 6-pin, SOT-23 package. The INA2181 is available in 10-pin, VSSOP, and WSON packages. The
INA4181 is available in a 20- pin, TSSOP package. All device options are specified over the extended operating
temperature range of –40°C to +125°C.
For more details on this device, see the INA181 product page.
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100%
99%
Efficiency (%)
98%
97%
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99%
Efficiency (%)
98%
97%
VBat = 80 V
96% VBat = 160 V
VBat = 240 V
VBat = 320 V
95%
0 2 4 6 8
Output Power (kW)
Figure 3-4. Bidirectional DC-DC Efficiency vs Output Power at 400-V DC-Link
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Figure 3-5 and Table 3-3 further show the efficiency of this converter versus output current at 400-V DC bus to
demonstrate the capability in handling currents up to 30 A.
1
0.99
Efficiency (%)
0.98
0.97
VBat = 80 V
0.96 VBat = 160 V
VBat = 240 V
VBat = 320 V
0.95
0 5 10 15 20 25 30
Output Current (A)
Figure 3-5. Bidirectional DC-DC Converter Efficiency vs Output Current at 400-V DC-Link
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4.1.1 Schematics
To download the schematics, see the design files at TIDA-010938.
4.1.2 BOM
To download the bill of materials (BOM), see the design files at TIDA-010938.
4.2 Tools and Software
Tools
TMDSCNCD280039C TMS320F280039C evaluation module C2000™ MCU controlCARD™
Software
Code Composer Studio™ Integrated development environment (IDE)
4.3 Documentation Support
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