The selection of the magnetic components to be used in a Switch Mode Power Supply (SMPS) design is the most important element of that process. During this, understanding the topologies of SMPS’ is crucial as the designer must consider the trade-offs between them. This article will give you an overview of these tradeoffs.
|Recommended power rating||Low to medium power up to 200W max. with wide output voltage range||Medium to high power up to 500W max. in the low output voltage range||High power >>100W at the high voltage range|
There are numerous circuits which convert AC or DC input to the required DC output, and here I will only address the most common and popular. Three broad basic topologies can be identified, they are: Flyback, Forward, and Push-pull
THE FOLLOWING TABLE SUMMARIZES ADVANTAGES AND DISADVANTAGES OF THESE THREE TOPOLOGIES:
THE CORE SIZE—-E, EF, EFD, ETD, P, RM, U, TOROID
The following table shows which core types for your transformer could be considered suitable for the different converter topologies
|Ring cores (toroid)||–||+||+|
+ Favorable, 0 Average, – Unfavorable.