巴赫曼BS212 Bachmann

BS212

过输出MOSFET的寄生二极管进行电流再生时，其功耗应该是寄生二极管的正向电压×电机电流。然而实际上，有时功耗可能会大于这个计算值。

其原因是当电流流过输出MOSFET的寄生二极管从而产生正向电压时，MOSFET结构上固有的寄生晶体管会工作，电流从电源流向GND。这个电流小到不足流过二极管的电流的几十分之一，但功耗是“电源电压×电源－GND间电流”，是电源电压较高时不可忽视的值。

下面将从驱动器输出MOSFET的状态、电流的流动以及输出MOSFET的结构角度来解释说明这种现象。

首先来看电流再生时输出MOSFET的状态和再生电流的流动情况。下面是H桥电路，但其中省略了与工作无关的MOSFET。（a）是给电机供给电流时的电路，（b）和（c）都是电流再生时的电路，但由于有两种电路状态，所以将（b）命名为“电流再生时1”、将（c）命名为“电流再生时2”。

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