ABSTRECT
In intelligent product development, many of the commonly used SCM did not provide PWM voltage output and, in some occasions the need to be specific PWM signal. PWM control technology in its control simple, flexible and dynamic response of the advantages and become a power electronics technology most widely used method of control, but also on the hot people.
PWM control technology has been variable frequency technology is one of the core technology, the PWM frequency can achieve harmonic suppression of anti-PSA characteristics, in AC drive until other energy transformation systems are widely used. The current method for the introduction of digital programme, completed on-line real-time optimization of the PWM signal output.
This article introduced the concept of the PWM signal generator, the role and definition of the principle and system software and hardware design. AT89C51 SCM was the main control unit as the core, through the external circuit chip design and implementation of the PWM output waveform frequency, voltage amplitude and duty cycle of continuous adjustment to achieve the objective of a PWM signal.
