I am trying to regulate current in Buck converter for battery charging application. Current is sensed using current transformers in series with Buck MOSFETs and diode. Even though the current is regulated up to 10A, I am not able to regulate current less than 1.5A as CT is not reflecting MOSFET current. I am using tape wound core with 1:200 turns and switching frequency is 30kHz. The scheme is as attached. NMOSFETs M1 and M2 in the scheme has 180 degrees phase shifted gate to source control signal with each maximum duty ratio of 50%.
