Ripple in the power supply on PCB

[snaku]

Hi All,
What are the causes of the ripple in the power supply? Are there any other reasons apart from the inherent ripple present in the main power supply, to cause ripple in the power supply?

Regards,
Naveen

 

[xxtigerxx]

there are lot of reason. Outside noise not good ground plane.
But can you tell us what is the level of the noise in volts and how you measure it.

 

[hussain_kiet]

you should have used the power electronics forum for this post...

if the inherent ripples are not filtered out then it is one cause, also if it is switching supply then it also generate ripples due to switching...

 

[sunil_n]

Use decaps for power supply ripples...be sure to use proper grounding

 

[pranam77]

you should have used the power electronics forum for this post..

Thank you..Moved.

@snaku....If you find interference on a power line, what type of interference is that and how did you measure it? Put up the deatils. Using sub standared SMPS power too puts adequate EMI and RFI on the lines. Try using transformer based supply instead.

 

[kandhu26]

How you are converting AC into DC.. If you are using Transformer[step downs the AC voltage], the step down AC voltage is given to Bridge rectifier... The output of bridge rectifier will be pulsating DC with ripples... Our main concern is to suppress the ripples, for that we use filter capacitor [1000uF] and decoupling capacitors [100nF]...