H桥电机驱动器工作原理
在日常生活中的电动车窗，折叠后视镜，天窗，座椅控制和许多类似系统，都是通过简单的直流电机运行。这样继电器控车辆中的各种电机。
因为驱动继电器很简单，与之相比MOS在噪声，使用寿命，尺寸和可靠性方面要优越的多，因此使用MOS代替继电器始终是更好的选择，此外继电器无法控制电机的电流，控制电机是通过H桥网络实现的。
最简单的驱动桥是PWM，通过可变占空比的控制信号改变转速。
双极驱动允许同时打开两个MOS管，正向运行。
反向运行，通过不管的MOS管导能改变电机的正反转，通过PWM占空比改变其速度。
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