Relevant Background Information
As part of my Bachelors Thesis I have to design IOT integrated control Electronics for a Pick-And-Place Machine. This specific machine has modules that can be attached to its Z axis that allows it to do different tasks. Here comes the part relevant to the question. The power supply for these modules come at 48V and have to be reduced to 24V,12V,5V,3.3V inside the module. I am deducing from the large size of the machine and the distance between the power source and the module there should be a lot of parasitic noise induced. I was thinking it would be a good idea to implement high-frequency noise filtering and then regulating the 48V to the respective voltages using buck converters. Here is a block diagram of what I had in mind:
Here comes the first question, does this sort of an implementation make sense?
What sort of a Low-Pass Filter to choose
The second question: What sort of a low pass filter should one choose in such an application? A circuit that I am familiar from Uni and was also recommended here is the RLC Low pass filter:
Since R_L is the inner resistance of my circuit it isn't relevant to calculate. However, I have no idea how to choose the cutoff frequency in such an application. If I am not mistaken the relation of the output AC signal of such an RLC should be like:
U_RL = 1/(1-(w^2)LC)*U_in
How to choose the inductor and capacitor type and values?
Now I don't know the cutoff frequency, I have no idea how to choose the L and C values either so I cant draw a Bode Diagram. I read that I could choose the cutoff frequency anywhere from 7kHz to 5Mhz, but that is an awfully large range. I have no idea on what type of capacitor or inductor to use. So I am stuck. Any help on the matter would be much appreciated, I would love to get some insight from more experienced engineers.