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Buck converter with a pi filter

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Johnjacob

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Im building an ac/dc converter for a battery charger, it takes in 120V AC in and outputs 90V DC at 20A max. To further improve the output performance of the buck converter, i decided to build a pi filter containing 2 capacitors and an inductor..it is essentially used to filter harmonics at at 100 kHz. What do you think of the schematic? fff.JPG
 

Having a switch in the negative line and an asymmetrical filter with inductors in the positive line generates maximum common mode interferences and doesn't make much sense, EMI wise.
 

FvM said:
Having a switch in the negative line and an asymmetrical filter with inductors in the positive line generates maximum common mode interferences and doesn't make much sense, EMI wise.
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Thanks...So if I were to change the switch to the positive line, will it it be suitable to filter harmonics at at 100 kHz with this configuration?
 

So if I were to change the switch to the positive line, will it it be suitable to filter harmonics at at 100 kHz with this configuration?
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That's in fact much better. You should check if the filter behavior is acceptable with the load transients in your circuit. The about 1 kHz cut-off frequency of the LC low-pass might cause heavy ringing in some cases, similarly the input LC filter.
 

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