Robust AC Film Capacitors for High-Ripple Applications

TDK Corporation presents a series of robust EPCOS MKP film capacitors (B3275) that are optimized for use with ac voltages with high ripple currents. The new types are available for rated voltages of 250Vrms, 275Vrms and 310Vrms and cover a capacitance range from 1µF to 70µF.

One particular feature is their extreme robustness: The capacitors pass a THB test (temperature, humidity, bias) at 60 degrees C, 95 percent relative humidity and a rated voltage applied for 1000 hours.

The MKP film capacitors are designed for a maximum operating temperature of 105 degrees C: Both their case and the epoxy resin sealing comply with UL 94 V-0. Depending on capacitance and voltage class, the lead spacings are 27.5mm, 37.5mm or 52.5mm, with 4-pin versions offered for the two larger lead spacings.

The capacitors feature a long expected lifetime of more than 60,000 hours at a temperature of 70 degrees C and 90 percent of the rated voltage. Typical applications for the new EPCOS MKP film capacitors are the output filters of frequency converters, uninterruptible power supplies and variable-speed drives.

Main applications being anticipated include:

• Output filters of converters
• Uninterruptible power supplies
• Controlled drives