Investigation of EMI reduction in buck converter by using external chaos generator

2011 INTERNATIONAL CONFERENCE ON RECENT ADVANCEMENTS IN ELECTRICAL, ELECTRONICS AND CONTROL ENGINEERING Pub Date : 2011-12-01 DOI:10.1109/ICONRAEECE.2011.6129784

P. Aruna, L. Premalatha

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引用次数: 5

Abstract

DC-DC converters widely employed in various electrical and electronic appliances, release electromagnetic emissions and thus form prominent sources of Electromagnetic interference due to their inherent fast switching. By operating the converters in chaotic mode EMI can be reduced without adding any filters. In this paper, voltage controlled buck converter is analyzed by FFT for EMI reduction under chaotic mode operation is proposed. The chaos is induced externally into the buck converter by using Wien bridge oscillator as its exhibits various forms of chaotic behaviour when operated in oscillatory mode. Simulations are performed using PSpice for observing chaos for the variation of input voltage. EMI reduction is observed for both conventional model of buck converter operating in chaotic mode for certain voltage range and proposed model of buck converter using FFT by spreading the spectra of the output signals over the whole frequency band. A protype model has been tested and hardware results shows the significant reduction of EMI in chaotic mode operation of buck converter.

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利用外部混沌发生器抑制降压变换器电磁干扰的研究

DC-DC变换器广泛应用于各种电器和电子设备中，由于其固有的快速开关，会释放电磁辐射，从而形成突出的电磁干扰源。通过在混沌模式下运行变换器，可以在不添加任何滤波器的情况下降低电磁干扰。本文用FFT分析了压控降压变换器在混沌模式下的电磁干扰抑制问题。由于稳压变换器在振荡模式下工作时表现出各种形式的混沌行为，利用维恩桥振荡器从外部诱导混沌进入稳压变换器。利用PSpice对输入电压变化引起的混沌现象进行了仿真。在一定电压范围内工作在混沌模式下的传统降压变换器模型和采用FFT将输出信号的频谱扩展到整个频带的降压变换器模型都观察到EMI的降低。对样机进行了测试，硬件结果表明，降压变换器在混沌模式下的电磁干扰显著降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 INTERNATIONAL CONFERENCE ON RECENT ADVANCEMENTS IN ELECTRICAL, ELECTRONICS AND CONTROL ENGINEERING

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