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AN4070 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN4070 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 53 page  December 2012 Doc ID 022934 Rev 1 1/53 AN4070 Application note 250 W grid connected microinverter By Rosario Attanasio Introduction This application note describes the implementation of a 250 W grid connected DC-AC system suitable for operation with standard photovoltaic (PV) modules. The design is associated to the STEVAL-ISV003V1 demonstration board which demonstrates the possibility of implementing a full microinverter solution (MIC) using STMicroelectronics products. In fact, both the components used to implement the power, control and communication section belong to the product portfolio offered by STMicroelectronics. The design is based on two power stages, namely, an interleaved isolated boost DC-DC converter and a mixed frequency DC-AC converter. The control section is based on an STM32F103xx microcontroller which ensures proper maximum power point tracking (MPPT) on the input side of the system and decoupled control of the active and reactive power on the output. The control algorithm has been developed to allow system operation both with 230 V AC, 50 Hz grids and with 240 V AC, 60 Hz without any hardware modifications. The connection to a 120 V AC, 50/60 Hz grid requires few hardware modifications to ensure the best system performance. An image of the STEVAL-ISV003V1 demonstration board is shown in Figure 1. Figure 1. Image of the 250 W MIC www.st.com |
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