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Can't prevent outer noise.

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seyyah

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We have a circuit that creates square wave at several KHz. When there is no interference, the waveform is good. But when an external noise source is online, like a motor driver, even if it is at a great distance, the waveform is distorted highly. There is a noise component in the supply that powers the circuit that produces the waveform. We could not prevent the noise that comes through the power line. What do you offer? The supply scheme is similar to the one that is in the drawing.
 

perhaps you can change the 24V switcher and get an isolated one....then with enough caps on the output surely there would be no noise to the waveform...tho' others my chip in here.

it also may help to put extra filtration at your switchcers input....like common mode and differential mode filter.

and see about the motor driver...if it has sufficient emc protection itself

can you swap in another switcher to see if the noise is still there?
 

We are using different kinds and brands of SMPS but there is no change. Differential filter helps a bit. Using two low frequency tranformer for 50Hz grid cascaded together helps a lot. But it is not practical to apply.
 

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