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.

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