B3279X Series Capacitors

EPCOS presents a series of AC capacitors with capacitance ranges from 2 µF to 75 μF and radial terminals for PCB mounting. B3279X series output filter capacitors feature types for voltages up to 400 V_AC and can be used in a wide range of output filter modules. Higher capacitance values can be realized by placing several capacitors in parallel in the PCB assembly, thus allowing filter designers and manufacturers to design power converters even up to 500 kW with modular systems. Compared to other AC filtering solutions, the B3279X series offers smaller size with higher capacitance values, higher current density per capacitance and volume, and operation at temperatures up to 105°C.

Power electronic designers are implementing more and more complex switching algorithms for pulse-width modulation (PWM) to gain efficiency and power quality. Such designs, however, introduce higher frequencies and harmonics into systems, which must be properly filtered by using LC and LCL filters at the output of the frequency converters. Applications for the new series are, in particular, in star-connected LCL circuits of three-phase power converters (DC/AC or AC/AC) for drives. Additional applications include inverters for solar power as well as UPS systems and discrete filters. The capacitors can also be used in single-phase systems.

A typical application is an output filter module (e.g. LCL) in star connection in a three-phase power converter
(DC/AC or AC/AC). The capacitors can also be used in single-phase systems.