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Compact, low loss EMC filters for high current photovoltaic applications

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By Nick Flaherty

EMC/EMI filters on the AC and DC side of inverters and converters contribute significantly to compliance with the EMC directive and also improve system reliability, and the the FN221x HV and FN331x HV filters are optimised for the requirements of photovoltaic, power conversion, energy storage and motor control systems.

The filters are aimed at high current applications for 690 VAC and 1,500 VDC PV inverters, converters and motor drives. Together with appropriately sized 690 VAC FN 331x HV filter on the line side, the new FN 221x HV DC filters help to meet the limits of EMC standards for PV installations in Europe and other regions. The 1500 VDC filter FN 221x HV also helps to increase the service life of the solar panel, improve its reliability, and reduces potential interference radiations of the panel by filtering high-frequency and leakage currents from the inverter.

FDIS recently approved the new international CISPR11, Ed.6.0 standard, which defines now the conducted emission limits at the DC power ports of “Grid Connected Power Conditioners”, and the FN 331x AC filter helps to meet the already well known EMC standards and are optimised to suit the most modern inverter design requirements of various power converter types.

The new filters will require much less installation space compared to traditional solutions, due to the optimised attenuation performance levels. They also offer minimum power loss related to the rating of the inverter and thus help to maximize the system efficiency.

Both bus-bar filter series are available with ratings from 250 A to 2,300 A. Versions without capacitors to ground are also available as standard product for specific AC and DC power system requirements.

All models are CE, UL, CSA and ENEC (FN 331x HV) approved and RoHS compliant

More detailed information is available on www.schaffner.com


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