Capacitors for Power Electronics

PEC capacitors applications

Energy - Production and distribution of electricity
• Wind power plant
• Photovoltaic power plant
• ESS - Energy Storage Systems
• UPS - Uninterruptible Power Supply/Source
• Machinery - Drives of industrial lines and equipment
• Oil and mining industry
• Railway traction vehicles - Electric trains
• Trams, Trolleybuses, Metro
• Electric and hybrid buses

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MKP capacitors uses polypropylene film as the dielectric, which excels in low dielectric loss. PP film is metalized with a thin layer of zinc-aluminium alloy. Two layers of metalized film are wound into cylindrical windings. Flat sides of windings are contacted with zinc layer ensuring connection to terminals. Special structure of winding ensures feature called “self-healing”.

In the event of voltage breakdown, the metal layer is evaporated around the breakdown channel in very short time. Thanks to evaporation, no conductive channel is created between both metal layers and capacitor remains in full functionality.


Capacitor lifetime depends strongly on hotspot temperature and working voltage. The higher the hotspot temperature and the voltage is, the lifetime decreases exponentially. Hotspot temperature is linked with current load of the capacitor.

Lifetime expectancy, described in graph below, is calculated according to previous experiments, long-time experiences and theoretical predictions. Graph is theoretical curve and lifetime of different types of capacitors may vary. Standard designed lifetime is 100.000 hours at hot spot temperature 70°C.