The core technologies of high-voltage capacitors revolve around achieving objectives such as high voltage withstand capability, miniaturization, extended lifespan, and high reliability, involving breakthroughs in key materials, structural design, and manufacturing processes.
Regarding ceramic dielectrics, materials characterized by high dielectric constants and superior high-voltage insulation properties are utilized; common types include Class I ceramics (e.g., C0G/NP0), Class II ceramics (e.g., X7R, X5R, Y5V), and Class III ceramics (e.g., Y5V). Through the research and development of novel ceramic materials, the voltage withstand performance of high-voltage ceramic capacitors has been significantly enhanced, enabling them to achieve 150% of the capacitance offered by traditional solutions while simultaneously reducing physical volume by 40%. Improvements in thin-film manufacturing processes and material formulations have similarly led to enhanced voltage withstand capabilities and reduced dimensions; by employing ultra-thin metallized polypropylene films combined with advanced winding techniques, high-voltage film capacitors have been produced that-under equivalent voltage withstand conditions-exhibit a volume reduction of approximately 30% compared to traditional products.
For insulating oils, materials such as SAS-40E and M/DBT are employed; these capacitor oils are biodegradable, chlorine-free (non-PCB), and possess robust resistance to partial discharge. Furthermore, the adoption of novel ionic liquid electrolytes-which feature higher flash points and superior chemical stability compared to traditional electrolytes-effectively extends the operational lifespan of the capacitors.
