String inverters are mainly used in distributed PV power generation systems, including small and medium-sized power generation projects such as households, industrial and commercial roofs, and photovoltaic poverty alleviation. Users have higher requirements for intelligent power generation systems, more data collection and management. Inverters with functions such as monitoring will become the main trend of development.

The power switching device is one of the core devices of the inverter. It is responsible for the conversion of current and works at high temperature, high voltage and high current for a long time. The power switching devices in household string photovoltaic inverters mainly refer to IGBT discrete devices. Compared with MOSFET, IGBT has lower saturation voltage and is easy to achieve high voltage and high current. Plus, it is dominant in household string photovoltaic inverters.

The front stage of the PV inverter adopts dual-boost boosted IGBT devices. Plus, the rear stage adopts three-level IGBT devices, which is the best solution for medium-power photovoltaic inverters at present. 

Topological Structure Diagram:

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