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隔离型双向半桥DCDC电路,升压电感发出响声是什么原因,应该怎么办?

隔离型双向半桥DCDC电路,主电路如图,当我输入电流升至2.2A时,升压电感L1会发出嘶嘶的响声,请问是什么原因呢,应该怎么办呢