Abstract
The switching power supply has been generally used in various fields by the feature
of stability of output voltage，easy performance and simplicity. In AC power supply，
various researches for the application of the digital control is advanced by using the
DSP. Various DSPs for control （including ADC，PWM timer，and Mass memory）have
been specially developed from such a background. We have researched the applications of the next generation of controls such as Neural Network and H infinite control. However，this research hasn't yielded much practical value yet because these controls require expertise and a long time for programming. In this paper I proposed new digital PWM method using a DSP（ADSP-2187）. In this method，the error voltages are entered in to the DSP and the DSP chooses the optimum on-duty regulations from internal memory. Moreover，the DSP consistently monitors the control results and modifies the on-duty data as needed. In addition，the electric power efficiency is improved from 83 to 88% by using unipolar PWM by which dead time is decreased as much as possible.
