【摘要】 文章介绍了DDS(直接数字频率合成器)和PWM(脉宽调制)的基本原理,并且利用DDS芯片AD9833设计了一个DDS电路,可在一块芯片上包含一个采用28位相位累加器的数控晶振、一个正弦ROM以及一个10位数模转换器。利用DDS与C8051F020对PWM波形进行优化,从而对基于DDS的PWM波形的产生进行研究和探索。并且针对输出电压波形总谐波含量小,稳压、稳频精度高的特点,设计了110V/60Hz/10kW的进口电源。更多还原

【Abstract】 In this paper,the basic principle of DDS(Direct Digital Synthesizer)and PWM(Pulse-Width Modulation)are introduced.Using DDS COMS chip AD9833,a DDS circuit is designed,which includes a numerical controlling surge adopting 28 bits phase adder,a sine ROM and a 10 bits D/A transformer.The C8051F020 of DDS is proposed to optimize the PWM wave.Basing on DDS,we study and explore the PWM wave producing.Then according to the characteristics that output vantage wave with little resonances,steady vantage and steady frequency with high precision,we design the import electrical source with 110V/60Hz / 10kW.更多还原