Capacitors suppress RF interference

5 August 2009 Passive Components

Corona or partial discharge of metallised plastic film capacitors is regularly caused by ionisation of air pockets in the capacitor winding element. In demanding AC voltage circuits eg, where voltage is supplied via a capacitor power supply (the capacitor is switched in series to the load circuit as a low-loss series impedance) transient over-voltage may exceed the dielectric strength of the air pockets and cause partial discharge that may result in local demetallisation of the film and thus a considerable capacitance reduction.

WIMA MKP-X2 R series capacitors have been specially designed to cover such applications. Due to their internal series connection, they reportedly exhibit one and a half to two times as high corona inception voltage and thus higher rated AC voltage values than comparable components without series connection. They are well suited for applications with stringent requirements to the capacitance stability over time, and also for safety relevant applications like electromagnetic interference suppressor units at the mains input.

The capacitors are available with capacitances of 0,033 μF to 10 μF and a rated voltage of 400 V a.c.

For more information contact Greg Parker, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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