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40W-flyback结构LED驱动电源在TRIAC调光时,输入EMI滤波电感(工字电感)声音比较大



各位大虾好: 我最近在做一个40W-flyback结构LED驱动电源,要求支持TRIAC调光,可是在调光时EMI滤波电感(工字电感)声音比较大,不加triac调光时,没声音。

大家有没有遇到这种情况?是怎么解决?谢谢

输入:170VAC~265VAC;输入功率:40W; 输出电流:700mA;滤波器结构如下: