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250W micro inverter for plug-in PV panels
Demo board ST Microelectronics STEVAL-ISV003V1
Micro inverter
250W micro inverter for plug-in PV panels
http://www.st.com/web/en/catalog/tools/PF252215
The demo board STEVAL-ISV003V1 by ST Microelectronics has been designed using components by Magnetica, which contributed to the process of optimization in both efficiency and working temperatures of the entire application. The board integrates a dual conversion stage to connect to the grid every single panel of a PV array and maximizes efficiency by means of the MPPT algorithm implemented in the STM-32 microcontroller. The first stage is a DC-DC converter from the panel’s output voltage to roughly 400V, using the isoled interleaved boost topology, and equipped with Magnetica’s 2159 series of switch-mode low-profile transformers and 2162 series of inductors. The second stage, a PWM current controlled DC-AC inverter, is then connected to the grid by way of an LCL filter made of two 2196-series filter inductors.
Technical specifications
Nominal input voltage |
35.8V |
Input voltage range |
18-55V |
MPPT operating input voltage range |
20-40V |
Nominal input current |
7.6A |
Maximum input current |
11A |
DC-DC nominal output voltage |
380V |
DC-DC maximum output voltage |
450V |
DC-AC output voltage |
230Vac, 50Hz – 240Vac, 60Hz |
DC-AC nominal output current |
1.1A (230Vac) – 1.06A (240Vac) |
Power factor |
0.98 @full load |
DC-DC switching frequency |
35kHz |
DC-AC switching frequency |
17.4kHz |