Hi Guys,
So far so good, I am still messing around with theory of SMPS, it is amazing how they work; I will be using SG3525, it is a great IC, the shut down input will be used to detect primary over current to protect MOSFET from blowing up (using a sense resistor in series with the H-Bridge), and the error amplifier to regulate the output voltage, these 2 mechanisms will provide protection against short circuits and over voltage (in addition to fuses and other stuff).
the SG3525 will drive 2 IR2110 that will drive 4 IRFP460 (or maybe other Ref, I have a lot of MOSFET and IGBT in my box) , the feedback will be around the famous TL431 precision reference and an optocoupler to provide galvanic isolation between in/output.
I highly recommend you guys to go through "Power Supply Cookbook Second Edition by Marty Brown" very helpful book with a lot of theory and practical examples.
I will be posting schematics and some results in few days, the way I am going through this project is a "Block by Block", the first thing I did is get familiar with SG3525, I made it work as I expected, I used a potentiometer to change the duty cycle, also playing with IR2110 with 2 IRF1010 MOSFET in half bridge config with a resistor as a load, things were fin.
Next will be combining both (SG3525 and IR2110) with some resistive load; just to let you know, I am using 12V battery to supply my setup, I do not want to mess with 310VDC at this stage.
Right after will be the transformer design, and the ultimate step of assembling every thing together, put eyes protection and give it some heavy juice (in series with a bulb of course)!!!
any advice is welcome.
and think a lot about safety.
Regards,
RABSMPS.