The switching power supply chip 3842 and the optocoupler cooperate with TL431 to automatically adjust the charging voltage; the operational amplifier LM358 has short circuit, overcurrent, overvoltage, and reverse connection protection; for details, see: https://wenku.baidu.com/view/6df9feaff61fb7360b4c659c.html? sxts=1590043318053
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