摘要
提出了一种新的提高数字脉宽调制分辨率的方法,能够极为有效地抑制PWM量化误差所造成的极限环振荡。脉宽调制的量化误差将在脉宽调制模块内被消除,而不会传播到输出端,从而可提高数字脉宽调制的分辨率,保证了高精度输出。通过对一个DSP控制的开关频率达100kHz的DC/DC变换器进行试验,计算机仿真和电路试验结果验证了其理论分析。这一算法可被有效的应用在电力系统的各种精密输出电源如电站的后备电源等中。
With the development of digital controlled power converter,the problem of limit cycle caused by low resolution of digital PWM arouse the interest of many experts.Some solutions are advanced.A novel strategy of improving digital PWM resolution is put forward in the paper.the limitcycle can be suppressed dramatically with the proposal algorithm.The quantization error is corrected in PWM module so that it will not propagate to the output directly,so the digital PWM resolution is improved largely.The theoretical analysis is verified by simulation and circuit experiment.A DSP controlled DC/DC converter can operate at 100 kHz without precision degradation.The strategy can not only be used in various highprecision output converters,but also is fit in the digital controlled backup power supplies in power system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第8期22-25,共4页
Proceedings of the CSEE
基金
浙江省院士基金资助项目
