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互变参数双混沌调制SPWM波生成原理及实现方法

DOI: 10.13334/j.0258-8013.pcsee.2014.30.010, PP. 5335-5342

Keywords: 混沌正弦脉宽调制波,混沌序列,周期性,双混沌映射,基于现场可编辑逻辑门阵列

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Abstract:

利用混沌序列对三角波进行混沌扩频,进而实现混沌脉宽调制(pulsewidthmodulation,PWM),可以达到降低正弦脉宽调制波(sinusoidalpulsewidthmodulation,SPWM)谐波峰值、减少机械谐振等目的。针对传统SPWM波混沌调制在实现时混沌序列很快进入周期以及运算量大的问题,该文提出一种由传统Logistic混沌映射和Tent混沌映射相结合的改进的互变参数双混沌序列映射,并给出对应的SPWM波生成方法。与传统混沌序列生成方法相比,该方法具有较低的运算资源消耗,较快的运算速度和较好的混沌性,且混沌序列周期明显增加。接着给出基于现场可编辑逻辑门阵列(field-programmablegatearray,FPGA)的硬件实现方法,并将该方法生成的SPWM波与其他调制方法生成的SPWM波进行对比分析。结果表明,该算法实现简单,占用资源少,并可明显降低谐波峰值。

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