Tongfeng began to develop power electronic capacitors in 1996. The product structure includes oil-immersed square stainless steel shell, dry square stainless steel shell, dry square plastic shell, dry cylindrical aluminum shell, etc。It is used for DC support, connection, AC-DC filtering and circuit protection，Products are widely used in locomotives, trams, trolleybuses, mining locomotives, ships, hybrid vehicles and pure electric vehicles, wind and solar photovoltaic power generation equipment and other inverter and flexible power transmission and transformation, smart grid and other power equipment。The product has passed IRIS certification。