Electronics > Beginners

Ripple current / voltage, what is too much?

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FriedMule:
It could be chips like ADCs and DACs, but also other kinds.

FriedMule:
Is the common mode choke placed correct or where would you place it?

FriedMule:
I have tried to simulate my PSU in LTSpice, what have I done wrong to get that strange result?
Have never simulated before!

mvs:

--- Quote from: FriedMule on October 26, 2018, 12:12:16 pm ---I have tried to simulate my PSU in LTSpice, what have I done wrong to get that strange result?

--- End quote ---
Ground connection is missing at lower R1 terminal.

To simulate common mode choke you need to flip one inductor and add following SPICE directive (Edit->Spice Directive):
K1 L1 L2 1

Start with normal resisistor as load. Pulsed current source is a bit complex.



--- Quote from: FriedMule on October 26, 2018, 08:19:52 am ---Is the common mode choke placed correct or where would you place it?

--- End quote ---
Common mode choke is typicaly used in mains input filter of switched mode power supplies to limit EMI.
If you are designing power supply with 50Hz transformer, you do not need it.

FriedMule:
Thank you a lot:-)

It changed it but how can the ripple be so low, where is my error now?

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