ST STEVAL-ISV002V2, User Manual, Page: 5 / 19

UM1016 System description
Doc ID 18125 Rev 1 5/19
microcontroller, are also placed on the same PCB to interrupt/connect phase and neutral of
the system to phase and neutral of the grid. Moreover, this board is provided with 2-way
connectors for electrical wiring of the LCL filter to the main power board.
The multi-output power supply board implements two independent offline flyback
converters, with a wide input voltage range, based on VIPer™ technology, to generate the
following output voltages:
● +5 V to supply DC-DC converter gate drivers
●
+5 V to supply DC-AC converter gate drivers
● +5 V to supply the microcontroller
●
+/-15 V for LEM sensor supply
● 24 V for relay supply
Figure 3. Description of the STEVAL-ISV002V2 main parts
Figure 3 shows a more detailed description of the hardware implementation according to the
nomenclature used above.
The main power board is highlighted in yellow and clearly shows the way it hosts two
ancillary boards: the multi-output power supply board and the control board with
STM32F103ZE. They are both highlighted in red in
Figure 3 . Also the output sensing and
relay board is highlighted in red and placed near the two filter inductors highlighted with a
grey circle and the coupling inductor highlighted by a blue circle. The coupling inductor is
also connected in series with a circuit breaker providing fault protection.
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