在项目中，经常要考虑反接保护。因为很多时候出于成本、空间考虑，有的板子接口是没有使用防呆接口的。并且我还遇到过大力出奇迹的现象，即连线的时候明明用了防呆接口，却被大力出奇迹给反着硬怼上去了。

1.串联二极管

利用二极管的单向导通，将二极管串联到电源的主回路中。这么做需要考虑二极管的载流能力、正向压降。

串联二极管的电路简单，但是在工作时会损失一部分电压，例如PIXHAWK2.4.6的供电UBEC使用的是5.3V，这是因为PIXHAWK2.4.6的供电主回路里串联了一颗正向压降为0.3V的二极管。

2.并联二极管

同样也是利用二极管的单向导通特性，将二极管并联在电源两端。当电源接反时，二极管形成短路，保护后级电路。至于电源嘛，交给天意了。

并联二极管的电路也十分简单有效，该电路相比串联二极管电路效率更高，二极管在正接时不起作用，只有反接才起作用。至于有些工程师可能会考虑电源短路会如何，我想大部分电源应该都会有短路保护吧，如果是动力电池的话，短时间短接放电问题也不大。相比娇贵的控制电路，电源电路即使受到损坏，也把成本降低下来了。

3.串联MOS管

将MOS管按照体二极管的方向串联到电路中。以NMOS为例，栅极连接电源正（如果电源电压过高，需要串联一个分压电路，以及并联钳位二极管来保护栅极），漏极连接电源负，源极连接负载负。

可以分析，系统在刚上电的时候，电流通过体二极管形成导通，此时GS之间会产生一个电压差，因此MOS管导通。MOS管导通之后由于MOS管内阻极低，可以认为体二极管关闭，电流从MOS管经过。

如果接反，体二极管截止，Vgs不会产生电压差，因此MOS管关断，电路断路。
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