Abstract : In industry, AC motors are widely used, and a significant portion of them require power supply from timing devices. A relatively easy-to-implement SPWM modulation scheme, commonly used in frequency converters, is adopted and combined with the TMS320LF2407 chip, making the system easier to implement. Keywords : Power supply; Frequency converter; SPWM [b][align=center]Realization of Modulation of SPWM Based on DSP REN Hui． W1J Guan -nlao． FAN Guan-tin （Anhui University of Science and Technology．Huainan 232001．China）[/align][/b] Keywords : power supply; transducer; SPWM 0 Introduction In industry, asynchronous motors are widely used, but speed regulation of asynchronous motors is quite difficult. How to achieve smooth, stable, and wide-range speed regulation is a major topic in the speed regulation industry. [b]1 SPWM Modulation and Implementation Principle (1) Basic Principle of SPWM[/b] [b][align=center]For details, please click: Implementation of SPWM Modulation Based on DSP[/align][/b]