hello dear forum members thank for answers
according to your advice I took 100 Ohm for burden res and amplified the CT output with high freq opamp
and I rectified after - now there is no big phase shift
however my problem is not solved completely
I planned to use a UC3867 ZCS IC for driving my half bridge inverter
I set the min freq of UC3867 9 KHz and I left error amp pins open and I connected my rectified CT output to the Zero pin of UC3867
first I drove the mosfets with STM32 uC at 20 KHz ( I didnot drive MOSfets with UC3867 )
I was expecting that UC3867 IC MOS outputs would be modulated by Zero pin and
these outputs would be synchronized with the CT output
however this didnot happen and following photo of osci.
UC3867 didnot synchronize with CT and still produce MOS outputs at its own min freq ( not 20 KHz )
my question; how can I make UC3867 IC work for bringing my inverter to ZCS mode automatically ?
sorry this is my best english, hope you understand what I mean