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Current snse in push pull techniques

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mtawab74

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Dear All
I'm going to build a step up from 12 Vdc to 300 Vdc/ 300 watt using push pull topology in current mode configuration, as i have to sens current wich is about 37A with duty cycle 45% for each transistor

the peak sens voltage <= 1 volt
so i nees 25 mOHM/30watt resistor which is expensive and loosy solution

i wounder if i can sens secondary current(1 A) dose this affect the Current mode topology?????????

also i'm thinking about buildig a PCB transformer to sens the current
my Idea is to pass the 37A trace as close as possible to a spile constructed by PCB traces dose this idea work??????

also i'll use Ti uc3825B wich is 4.8$/1K pcS dose anyone know a less costly push pull driver????????????
thanks
 

Hi mtawab74, yes you have to use a current transformer capable of
twice your switching frequency if you try to sense the center tap on
the switching transforner or the sources of your Mosfet's or IGBT's.

Or you can sense the drains of each Drain and recombine the outputs
diodes to one output ( ORing ) you have to use current mode and
pulse by pulse current limit.

Go to w*w.unitrode.com or w*w.ti.com for app notes.

Tornado
 

I'm asking about sensing the output current not the input
i mean to sens output inductor current which is only 1 A instead of sensing the primary which is 37 A

also what about the spiral besid the 37A trace dose this make a transformer

???
 

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