| 基于插入损耗的噪声源阻抗修正计算方法 |
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| 引用本文： | 张佳佳,张逸成,韦莉,叶尚斌,姚勇涛.基于插入损耗的噪声源阻抗修正计算方法[J].护理与康复,2015(4):80-87. |
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| 作者姓名： | 张佳佳 张逸成 韦莉 叶尚斌 姚勇涛 |
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| 作者单位： | 同济大学电子与信息工程学院 上海 201804,同济大学电子与信息工程学院 上海 201804,同济大学电子与信息工程学院 上海 201804,同济大学电子与信息工程学院 上海 201804,同济大学电子与信息工程学院 上海 201804 |
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| 摘 要： | 为了使EMI滤波器能够实现有效的插入损耗，需要考虑噪声源阻抗的频谱特性。电压插入损耗法是最简单的测试噪声源阻抗的方法。本文分析了传统的电压插入损耗法在实现过程中采用的假设条件，部分假设在数学上并不严格成立，相应的简化近似计算可能导致较大误差；甚至有些计算结果会与假设条件矛盾，进而导致计算结果无效。在不改变传统插入损耗法的测试方案的前提下，对噪声源阻抗的计算方法进行修正，推导了源阻抗幅值的精确解析表达式，进而确定源阻抗幅值的最大值和最小值。解析计算结果经过数学验证成立。在此基础上，以电动汽车用DC-DC变换器为测试对象，实现了源阻抗幅值的测试和计算，验证了该方法的有效性和适用性。通过该测试和设计实例的分析可以发现，改进的电压插入损耗法可以获得更精确的噪声源阻抗，避免滤波器的过设计，便于滤波元件的设计和选型，并为滤波器体积、重量等的优化提供帮助。
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| 关 键 词： | 噪声源阻抗 电压插入损耗 EMI滤波器 阻抗失配 |
| 收稿时间： | 2013/7/12 0:00:00 |
| 修稿时间： | 2013/10/15 0:00:00 |
A Revised Calculation Method for Noise Source Impedance Based on Insertion Loss |
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| Zhang Jiaji,Zhang Yicheng,Wei Li,Ye Shangbin and Yao Yongtao.A Revised Calculation Method for Noise Source Impedance Based on Insertion Loss[J].Nursing and Rehabilitation Journal,2015(4):80-87. |
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| Authors: | Zhang Jiaji Zhang Yicheng Wei Li Ye Shangbin and Yao Yongtao |
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| Affiliation: | Tongji University Shanghai 201804 China,Tongji University Shanghai 201804 China,Tongji University Shanghai 201804 China,Tongji University Shanghai 201804 China and Tongji University Shanghai 201804 China |
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| Abstract: | Usually, to achieve effective insertion loss of EMI filter, the characteristic of noise source impedance in frequency domain should be considered. As known, voltage insertion loss method is the simplest way to test noise source impedance. In this paper, the assumptions used in the conventional voltage insertion loss method were analyzed at first. Then it was found that some of the assumptions did not so strictly hold mathematically that the approximate calculation might lead to some significant errors, and that some calculated results were even contradictory to the assumptions, which made the results invalid. Thereafter, still following the conventional test plan, some correction on the calculation method of the noise source impedance was made, the accurate analytical expression of source impedance was derived and the maximum and minimum values of the amplitude of the source impedance were worked out. Moreover, the deduced results were verified mathematically. Finally, a test on DC/DC converter used on electric vehicles was carried out, in which measurement and calculation was made and the validity and applicability of the proposed method was verified. By the analysis of the test and design case, it is shown that noise source impedance can be calculated more accurately using the improved voltage insertion loss method, which avoided EMI filter overdesign, facilitated filter design and device choice, and aided optimization of filter volume and weight. |
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| Keywords: | Noise source impedance voltage insertion loss EMI filter impedance mismatch |
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