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|24th July 2014, 04:51 AM||#1|
Join Date: Apr 2010
Location: Nis, Serbia
IR2153 Full Bridge + 4 x EI33 from ATX 1200W
Hi to all..
I make this shematic and in theory (If I didnt miss something) it shuld be work and give it high power with 4 x IRFP450 and 4 x EI33 from ATX power supplay without re-winding and changing anything.
Working freq. is 100KHz (7.5K + 1nF) and two of this gate drivers IR2153 are connected for Full Bridge in PSM (phase shifting modulation) which provide output voltage adjustment with trim pot. (Setting up angle of pahse shifting change voltage of primary winding of 0V to 320V).
On 100KHz for full bridge EI33 can deliver 400W and need 40 turns on primary side because of Full Bridge tipology (double number of turns on primary). For bigger power we can use two EI33 transfomers like one big transformer (each primary in series and secondaries too with GND central tap) but each transformer need only half of number of turns.
Than we can make from the outside (without transformer opening) two paralell windings of 20 turns on primary (original serial winding 20t+20t reconecting in central tap) and connect with two parallel windigs on second transformer to make serial conection of two paralel primary windings.
Two of this gropu of transformers are conected now in parallel for double-doubled power (4 x 300W = 1200W), with separated two caps of 2.2uF for output of the transformers. (This caps are here becase EI33 dont have an air gap)
Because this is SMPS without feedback, i can play with transformers like that. For protection I will make overvoltage protection and overcurrent protection with current sens transformer on primary side, but that is for future.
What do you think, can it work and be powerfull?
Thanks and regards, Nikola
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