Re: MOSFet Bridge Rectifier problem...
Dear Brian Sir,
Thanks for reply... well, though the thing has been designed in PIC, i am planning to use using AVR. I am making it just for me... (no commercial matter... thus price doesn't matter that much than the real quality and reliability and stability.). My plan is to use an ATTiny/mega8 (depends on availibility in my country's local retail market) for frequency generation. Or u can say just for driving the mosfet. Dafinitely modified sine (sq wave indeed). And for protecting the AVR, i can use an opto-coupler. To prevent Mosfet, i can use zener there or also the capasitor (that used) from the spike of inductive load.
there will be a complete different AVR for for monitoring and control of other AVRs/devices like change over, etc. For voltage measure, I need to make a AC DVM in the control AVR. Also need to measure current. For so, I got an idea from a site (I forgot the URL, i have saved it as PDF). It is said that using 0.05Ohm 5W 15 in Parallel for 2KVA. So based on that, I can scale it up. This shunt needs to be forced air cooled. Another approach is using CT. But since AC, I need to figure out a way... also for each 10 readings, i want to consider the max value of reading instead of average... since it's about load sense and safety, i can consider a little over estimation. I have made some drawings (like previous, paper... and i'll post them after taking pic.). I'll post all of them (including the plans, block diagrams, schematic) for sharing and improvement. And hope, finally it will become a rack mountable modular 5KVA IPS finally...
Mishu~
Added after 17 minutes:
The block Diagram as I planned...
And the referance of protecting MOSFET using Zener as i tolad already is here...
Note that, there are thousands of schematic on the net. but in my country, so many things are not available including SMPS transformer, regulators, drivers, even MOSFETs of some range and energy metering IC (like ADE75xx).
Mishu~