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您好,
非常抱歉,我对 音频变压器没有太多经验,不太确定是不是在低频高功率信号下变压器磁芯出现铁芯饱和造成的?因为看OT初级电流波形存在直流部分。
关于变压器铁芯饱和,下面文档希望对您有帮助:
https://www.ti.com.cn/cn/lit/an/sloa133/sloa133.pdf