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Capacitors for Power Electronics Applications

Power Electronics is one of the most happening and challenging field for capacitor applications. In power electronics the range of capacitors applications extends from industrial drives and wind power systems through uninterruptible power supplies to lasers for medical engineering. Power electronics capacitors also provide high power and energy efficiency in electric rail traction, DC Links, Damping, Resonant Filtering, frequency convertors, Snubbering and Clamping, etc.

Taking in account the intensity of application in Power Electronics, SPEL provides unique featured Capacitor with ULTRA LOW ESR value and low ESLvalue specially designed for Power Electronics application and maufactured as per IEC INTERNATIONAL STANDARD 61071.

In Power Electronics applications safety of operation and a safe failure mode are the most important criterion. SPEL Capacitors for Power Electronics comes with Explosion Proof features as standard Protection feature.

The unique advantage of SPEL Ultra Low ESR capacitor is its liquid free construction and it's capability to sustain high ripple current, SPEL ultra low ESR capacitor are designed to withstand continously five times the rated current. Heat generation is lowest in it's class.

Polypropylene as a dielecric offers the user many excellent features most needed in power electronic applications like inherent low losses, excellent frequency response, very low Dassipation Factor and ESR stability with temperature and frequency. It can also provide tighter capacitance tolerance compared to polyester.

As a result of these characteristics, polypropylene dielectric is the “Dielectric of Choice” for power electronics. It’s only negative may be its maximum operating temperature of 105°C, since some IGBT junction temperatures can reach the 90°C area. But it is to be noted that the capacitors are not to be operated like a heat sink, but may as they tend to be mounted closer to the junction on the direct-mount IGBT devices extra precaution is desired, and in this environment Ultra low ESR haves an edge over normal low ESR Capacitors..

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