混沌调频开关电源调节器的电磁干扰

2002 23rd International Conference on Microelectronics. Proceedings (Cat. No.02TH8595) Pub Date : 2002-08-07 DOI:10.1109/MIEL.2002.1003323

H. Wong, Y. Chan, S.W. Ma

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引用次数: 10

摘要

在这项工作中，我们提出了一种用于开关电源的改进开关方案(称为混沌调频(CFM))，以抑制电磁干扰(EMI)噪声源。CFM的基本原理是利用混沌信号对开关信号进行调制，使噪声功率的谐波在整个频谱上均匀分布，而不是集中在开关频率上。与传统的脉宽调制(PWM)方案相比，CFM方法在传导和辐射EMI噪声水平上都有显著改善。对于传导电磁干扰，峰值噪声水平降低了25 dB。对于辐射EMI，我们发现噪音主要出现在30 MHz至230 MHz的频率范围内，CFM方案有助于将该频率范围内的峰值噪音水平降低22 dB。

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Electromagnetic interference of switching mode power regulator with chaotic frequency modulation

In this work, we propose an improved switching scheme (called chaotic frequency modulation (CFM)) for switched-mode power supplies to suppress the electromagnetic interference (EMI) noise source. The basic principle of CFM is to use a chaotic signal to modulate the switching signal such that the harmonics of noise power is distributed evenly over the whole spectrum instead of concentrated at the switching frequency. When compared with the conventional pulse width modulation (PWM) scheme, significant improvements in both conducted and radiated EMI noise levels were found with CFM method. For conducted EMI, the peak noise level was reduced by 25 dB. For radiated EMI, we found that the noise was found mainly in the frequency range of 30 MHz to 230 MHz and the CFM scheme would help to reduce the peak noise level in this frequency range by 22 dB.

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来源期刊

2002 23rd International Conference on Microelectronics. Proceedings (Cat. No.02TH8595)

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