pwm的实现

PWM的一个优点是从处理器到被控系统信号都是数字形式的，在进行数模转换。可将噪声影响降到最低(可以话跟电脑一样}。噪声只有在强到足以将逻辑1改变为逻辑0或将逻辑0改变为逻辑1时，也才能对数字信号产生影响。



对噪声抵抗能力的增强是PWM相对于模拟控制的另外一个优点，而且这也是在某些时候将PWM用于通信的主要原因。从模拟信号转向PWM可以极大地延长通信距离。在接收端，通过适当的RC或LC网络可以滤除调制高频方波并将信号还原为模拟形式。



PWM控制技术一直是变频技术的核心技术之一。1964年A.Schonung和H.stemmler首先提出把这项通讯技术应用到交流传动中，从此为交流传动的推广应用开辟了新的局面。-The realization of the PWM

An advantage of PWM signals　the processor to be control system is digital form, in the d/a conversion.Can minimize noise effects (noise can words like computer}. Only in a logic 1 is strong enough to change to logic 0 or logic 0 for the logic 1, also can affect the digital signal.





To the noise resistance ability enhancement is PWM another advantage compared with the simulation control, and it s will be the main cause of PWM are used for communication in some time.From analog signal to the PWM can greatly extend the communication distance.At the receiving end, through proper RC or LC networks can filter out high frequency square wave modulation and signal to analog form.





PWM control technology has been one of the core technology of frequency conversion technology.1964 A.S chonung and H.s temmler first proposed the application of the communication technology to the ac drive,　this has opened up a new situation for the application of ac drive.