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肖特基二极管在防止电源反接的作用
2022-06-29 00:59:00 【yanwu_nuc】
肖特基二极管在防电源反接这方面会做出怎样的应变能力?对电路起到怎样的作用?

二极管的单向导电性,电源接反了直接导通肖特基二极管,保护后级电路,当电压反接之后,肖特基二极管与与5V的输出端是并联电路,而肖特基二极管的阻抗要小,所以分流较多,从而保护输出端。
其实这里肖特基二极管主要起过压吸收作用,异常电压或高谐波超过肖特基二极管击穿电压时,肖特基二极管导通,保护电路以免击穿。
2、二极管防反接
直接在电源入口处串联一个二极管,电路简单,成本低,
这种电路一旦电压接反,会使得电路中电流为零。
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