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Active EMI filters

Active EMI filters from Picor are aimed at 24 and 48V dc/dc converter applications.

Three devices are available – the QPI-3, -5 and -6 – providing attenuation from 150kHz to 30MHz. The filters are said to deliver more than 40dB of common mode and 70dB of differential mode noise attenuation at 500kHz.

QPI-6 meets the specifications for the 36 to 76Vdc telecom bus, including the 100V, 100ms surge requirement. The QPI-3 and QPI-5 operate over a 10 to 40V dc range to support industrial bus and COTS defence applications. These are rated at 7 and 14A respectively. They support single or multiple dc/dc converters requiring up to 360W of input power at 24V input.

Graham Pitcher

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