Since 1996, Tongfeng has been researching and developing power electronic capacitors. The product structure includes oil-immersed square stainless steel shell, dry square stainless steel shell, dry square plastic shell, dry cylindrical aluminum shell, etc. As a DC support, connection, AC-DC filtering and circuit protection, the products are widely used in locomotive, tram, trolley bus, mine locomotive, ship, hybrid electric vehicle and pure electric vehicle, wind and solar photovoltaic power generation equipment such as frequency converter and flexible power transmission and transformation, smart grid and other power equipment. The product has passed IRIS certification.