Dry type shell less power electronic capacitors The core feature of dry-type unshielded power electronic capacitors is to directly encapsulate them with solid materials such as resin, remove the metal shell, and exchange them for explosion-proof, flame-retardant, high-voltage resistant, and high reliability. They are mainly used in high current and high-frequency applications such as DC filtering, IGBT absorption, and pulse discharge. The dry shell free structure achieves integrated packaging through metalized film design and flame-retardant epoxy resin encapsulation, eliminating oil leakage and explosion risks from the root. Compared with ordinary dry-type capacitors, the overall structure is more compact after removing the casing, with smaller parasitic inductance and equivalent series resistance, and better electrical performance. Key Features: 1. High safety: No oil, no metal shell, explosion-proof and flame-retardant, no oil leakage hazard, and no bulging or explosion due to increased internal air pressure. 2. Good electrical performance: low equivalent series resistance and self inductance, able to withstand large ripple currents and high surge currents, suitable for high-frequency, high-voltage, and high current operating conditions. 3. Self healing properties: Using metalized polypropylene film, it can automatically restore insulation after dielectric breakdown without overall failure. 4. Temperature resistance and lifespan: The dry structure, combined with resin sealing, has a wide working temperature range, low temperature rise, long lifespan, and can operate in harsh environments. 5. Lightweight: Without a metal casing and oil, it is lighter and more compact than oil immersed models, making it easy to install and transport. Main function: DC filtering: used in applications such as DC transmission converter valves, frequency converters, DC busbars, etc., to support system voltage establishment, smooth DC voltage ripple, and can replace electrolytic capacitors. IGBT absorption protection: It absorbs the peak voltage and surge current of IGBT switching moments, protects power devices from breakdown, and is commonly used in high-voltage and high-frequency pulse circuits. Pulse discharge: Used in situations that require rapid charging and discharging, such as pulse power supplies, which require high energy density and long charging and discharging life. New energy and traction: used for solar and wind energy inverters, as well as conversion systems for rail transit and electric vehicles.
