Input filter thoughts..

Discussion in 'General Electronics Chat' started by rblilja, Jun 12, 2012.

  1. rblilja

    Thread Starter New Member

    Jun 11, 2012

    I'm designing an input filter for a DC/DC converter (voltage-programmed). The converter will provide power to quite a few PWM controlled loads working at 10 to 20 kHz, the total current going through the filter will roughly be 2.5A.

    There are a few things I need to verify..

    1. Looking at my attached circuits and plot (Zipped LTSpice files), have I correctly calculated the filter's output impedance by adding an AC voltage source to the output and plotting Vout / Iout on an linear scale?

    2. Is the common mode choke both working as a common mode filter and a differential filter with this setup? Or should I add a pi-filter (CLC) after the common mode choke?

    I appreciate all suggestions of improvements / corrections.

    Thank you.