市面上有许多开关电源的输入端均设有110V／220V的交流选择开关。单凭一个开关怎样实现110V／220V两种不同电压的转换呢？ 大多数开关电源的输入端均选用如图1所示的输入电路。 当110V输入时，手动闭合开关K，过程分析。

Finding the right TIG welder can be a daunting task. From hobbyists to professionals, it can be challenging to sort through the hundreds of models out there and figure out which one will work best for ...