Low Pass Filter Design: Choosing L & C for Cut-off Frequency of 50Hz

[hisham.i]

Hello,

I am designing LC low pass filter for single phase sinusoidal pwm inverter, where the cut off frequency is f = 50 Hz.

And i have to chosse L, C such that: f = 1/2π√(LC)
but there is many combinations of L and c that result in this cut off frequency.

So my question is, how to choose these values?

 

[NascentOxygen]

A load is going to appear across C? This may have a major effect on the filtering ability of your L-C arrangement. You need to design it as an LCR circuit from the start, assuming you can represent your load as R.

Apply some maths, and sketch frequency response graphs, you'll see how it behaves.

 

[DragonPetter]

Hello,

I am designing LC low pass filter for single phase sinusoidal pwm inverter, where the cut off frequency is f = 50 Hz.

And i have to chosse L, C such that: f = 1/2π√(LC)
but there is many combinations of L and c that result in this cut off frequency.

So my question is, how to choose these values?

Do you need to select real parts, or is it just values that you need to select?