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手机充电器充电时有吱吱声音
更新时间: 2020-09-17 00:00:00  

聚合物节电压大约3、7-4、2V,需要使用DC-DC逆变电路升压到5V才能从USB接口输出给手机充电,升压需要先让直流电变为高频脉冲,然后使用电感或者变压器升压,如果脉冲频率在听觉范围内,就会出现噪声,理论上是属于正常现象,有两种原因会导致这种现象。1、手机支持快充,要求的电流过大。2、充电线的电阻过大。

关键词: 手机 充电器 充电 时有 吱吱 声音

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