Three-phase film capacitors for PFC and AC filtering

25th March 2014
Nat Bowers

Three-phase medium power film capacitors,  the FLB series has been introduced by AVX. Operating over a temperature range from -40 to +80°C, typical applications for the series include Power Factor Correction (PFC) and output AC filtering in power converters, UPS systems, solar and wind inverters and motor drives.

Packaged in a cylindrical aluminium can with terminals that enable direct, three-phase, internal wire connection, FLB series capacitors are comprised of metallised polypropylene dielectric imbued with a soft polyurethane resin. The capacitors also feature a dual safety system consisting of an overpressure disconnector and self-healing technology, as well as exhibit high ripple current and extremely high dielectric strength.

AVX’s FLB series three-phase, medium power film capacitors are available in nine case sizes, six voltages of 230-690V AC, capacitance values of 3*20.3-3*335µF, and three capacitance tolerances (±5%, ±10%, ±20%). Optimised for AC voltage performance, the series also exhibits high overvoltage capabilities as a result of its self-healing properties.

Additionally, unlike aluminium electrolytic capacitors, FLB series polypropylene capacitors do not have a catastrophic failure mode, as film capacitors simply experience a parametric loss of capacitance of approximately 5%, which both negates the risk of short-circuiting and enables continued functionality.

Lifetime for the RoHS compliant series is 100,000 hours at rated voltage and 70°C. Lead time for the series is approximately eight weeks.

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