| 开关电源控制芯片中减小EMI的一种电路实现方法 |
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| 引用本文： | 屈艾文.开关电源控制芯片中减小EMI的一种电路实现方法[J].福州大学学报(自然科学版),2010,38(1). |
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| 作者姓名： | 屈艾文 |
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| 作者单位： | 福州大学物理与信息工程学院; |
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| 摘 要： | 从减小噪声源的思路出发,根据扩频理论,提出了一种应用在开关电源控制芯片中的减小EMI的电路实现方法.采用三角波调制的方法调制振荡器的频率,通过采用调频PWM开关技术,使原本集中在开关频率及其高次谐波的尖峰上的能量展开到更宽的频带上,从而减小了EMI噪声.通过对振荡器输出脉冲波形的频谱分析,验证了所提出的振荡器结构可以实现减小EMI噪声源的作用.
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| 关 键 词： | 开关电源 控制芯片 EMI 扩频 |
A method of circuit implementations on reducing EMI in the control chip of the switching power supply |
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| QU Ai-wen.A method of circuit implementations on reducing EMI in the control chip of the switching power supply[J].Journal of Fuzhou University(Natural Science Edition),2010,38(1). |
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| Authors: | QU Ai-wen |
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| Institution: | College of Physics and Information Engineering;Fuzhou University;Fuzhou;Fujian 350108;China |
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| Abstract: | According to suppressing noise source,this paper proposes a method of circuit implementations on reducing EMI in the control chip of the switching power supply based on the spread-spectrum theory.This method adopts triangular modulating signal to modulate the oscillator frequency.Because of the switching frequency of the switching power supply with PWM(Pulse-width modulation)controlling decided by the oscillator frequency,modulating the oscillator frequency is the same as modulating the switching frequency.... |
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| Keywords: | switching power supply control chip EMI spread-spectrum |
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