逆变电源初级电流问题

请高手指点下:用tl494组装一套逆变电源,变压器初级0.33*15  3T+3T ,两只IRF1010,次级0.75  96T+24T,试机用96T输出接300欧电热丝,初级电流10A,用120T输出接300欧,初级电流7A,怎么回事?是IRF1010功率不够吗?
电路图
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