Filter capacitors with high energy density

The rated voltage of the UP3 series extends from 700 to 3,000V, the maximum current to 100Arms and the standard capacitance from 65 to 2,100 microfarads with a tolerance of 10%. Series resistance is in the range of 0.6 to 6.5mOhm, while the permitted peak currents are between 1,350 and 13,000A. The dielectric loss factor is 2x10-4 and the capacitors have an operating temperature range of -40°C to +85°C. The dielectric strength between the case and the terminals is tested for 3kV at 50Hz for 10s. Other routine tests are for capacitance, dissipation factor, series resistance, dielectric strength between the terminals and an external inspection, all in accordance with IEC61071.

The UL9 series has essentially the same characteristics as the UP3 series, as it is manufactured using the same technology. The parallel wiring of discrete individual components allows greater capacitances and consequently larger case designs. While the 40 members of the UP3 series are accommodated in an aluminum cylinder case with a diameter of 85 to 136mm and a height of 130 to 230mm, the 28 members of the UL9 series are housed in cuboid aluminum cases with lengths of 320 to 470mm, widths of 95 to 145mm and a height of 330mm. The UL9 series is available with capacitances of 380 to 17,100 microfarads. The terminals are available in screw type and also available with solid bus terminals which are suitable for IGBT direct mounting. Additional capacitance values, voltages and mechanics are available on request.

The film capacitors are destined for power conversion applications as developers can replace electrolytic capacitor banks with these components.