摘要
随机调制技术因其能够减少噪音,驱散谐波能量而使之具有更宽的带宽,减小常规的PWM调制中快速开关运行产生的干扰。这种方法不需要改变电力电子系统拓扑结构,也不增加系统额外耗费和体积,是解决PWM型电力电子系统中形成的传导电磁干扰问题的有效方法之一。特别是双随机调制技术具有更好的减少离散谱峰值的作用。文中分析了双随机调制技术的原理,并将TMS320F2812DSP实现的双随机PWM信号应用于实际的DC-DCboost变换器。研究结果表明,双随机调制技术能够较好地抑制常规调制方式所引起的传导EMI,比任何一种单随机调制具有更好地削减峰值和遣散功率谱的效果,从而有利于改善电力电子系统的电磁兼容性(EMC)而不影响功率变换器的输出特性;同时也证明了双随机PWM技术的工业应用是可行的。
Randomised pulse width modulation （PWM） schemes in power converters have shown a great potential of relaxing filtering requirements and reducing electromagnetic interference. If one or more of the PWM parameters are randomised, then the converter will operate in a non - periodical mode and the switching functions will have randomised components that are dispersed along the energy spectrum rather than clustered at the multiples of the fundamental. The principle and an experimental investigation on the dual randomised modulation（DRM）in DC-DC converter are addressed in this paper. Based on the TMS320F2812 DSP instrument in Boost power converters, this paper also presents the implementation of dual randomised modulation. The dual randomised modulation technology used in power converter is more effectual in reducing conducted EMI than a single randomised modulation. Moreover, a contented output voltage performance of power converters is presented.
出处
《现代电力》
2005年第4期16-19,共4页
Modern Electric Power
基金
湖北省教育厅青年基金项目(2004Q002)
