SMPS Circuit working and design

Hello,

I want to Know...
Why SMPS
Type of SMPS in Details
How to choose the right one
How to design SMPS Circuit.

Please guide.

for basics Wikipedia?? https://en.wikipedia.org/wiki/Switched-mode_power_supply

[Topic moved to Electronics Discussion Forum]

Thanks Mr. Bhargav.

I want to design my own SMPS for LED lighting application and others.
Want your suggestion for any design book or reference book in this regard.
Please suggest...

Regards...