Need to upgrade it... help guys

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aq_mishu

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Guys,
I got this from a site... it is an inverter... i'll modify it using AVR for making the waveforms... modified square wave. and then the mosfets for powering up it from 24VDC-220VAC. Till this, i can work... but i am planning it to make a full auto emergency backup power... obviously for long time backup... kind of IPS/UPS. I call Instant Power Supply. This the inverter needs a charger for batts. I am planning to use the same transformer here to reduce cost. also the mosfets for rectification so that large current can be rectified. Thus can you tell me how??? I cant actually figure out any solution....

Mishu~
 

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so that transformer is just a 50/60hz one ? ok
what your asking is if you apply 240VAC or 120VAC (depending what your AC supply is)
you want the mosfets in the circuit to do the rectifying for it ?

draw a half-wave rectifier (2 diodes), then try to imagine the mosfets doing the same
duty, except the mosfets are not self commuting, so your avr device with have to
switch them in synchronous to the wave form out of the transformer.

I said the mosfest are not self commuting, hmm but they can be...there is the intrinsic diode they all have, so i'm not sure the circuit can be that simple.....
anyway thats all i'll think of for now, and see what you come up with :|

cheers
 

according to this block diagram, i need the charger will use the mosfet for rectification and will charge the battery bank when the mains is available. and when the mains is not available, then charger will go off, the inverter will produce AC. now can you guys finish the block diagram for me.. i mean i cant find out a path and my brain is getting jammed.


Mishu~
 

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