Experiment with magnetic component:-

 

Reducing transient noise in SMPS

 

About Myself: -

I run a business of manufacturing electronics goods for consumers and for trainees’ engineers. I faced this problem 15 years back when I was working on a microcontroller project. I have a degree of Information technology. In my curriculum, I was never taught about such issue I was facing. So, I decided to tackle this problem and I know a lot of fresh engineers who are new to electronics and alike faces the same problem. What I was facing 15 years back.

 

Problem: -

Most SMPS including your 5 volt mobile charger has transient noise (aka Switching noise components) at the DC side of it. The transient noise is cause due to Parasitic component and wiring inductance used . It is also know as high frequency ringing.

ringing

From the above diagram you can understand what ringing is. Because of this ringing most Linear or digital ic doesn’t work’s properly. While designing a system you need to define the permissible noise that would be input power supply to the system or to the ic.

 

what causes this noise ?

In a loop in which currents are suddenly turned on and off during switching, high-frequency ringing (switching noise) occurs due to parasitic components.

 

Solution: -

To reduce Switching noise component to permissible level of the system. So that the system works properly.

 

Tolerance of ripple voltage:-

ripple tollerance

Experiment that I will perform:-

  1. Check whether the noise can be reduced or not using ferrite component.
  2. Test system for permissible noise.