hy! everyone..i am searching out some alternates for steppping up or stepping down the voltage so could any one plz guide me some methods for stepping up and down of voltage rather than traditional transformers..as to built a inverter having no transformer..

 

Research Switching power supplies.

smps.com is a good start.

Also, for buck (step down) and boost (step up) info, look into Linear Technologies Simple Switchers.

www.linear.com

 

You'll need SOME kind of inductor(s), or your supply will have very limited current source ability.

Any mains-powered supply must be isolated from mains power via inductors.

 

another good resource is www.smps.us. There are links to wher you can find textbooks on the subject as well.

 

This is a $65 in parts, analog pure-sine-wave inverter.

http://www.wpi.edu/Pubs/E-project/Available/E-project-042507-092653/unrestricted/MQP_D_1_2.pdf

Bubba oscillator is used for the sine wave. Bubba osc uses 4 opamps, so a decent quad op amp package may be all you need for that part.

It looks easy to build, but even if built perfectly correct, you still need a oscilloscope to set the opamps to proper oscillation