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2011•Electronics Optics & ControlRequires access

Study on Conducted EMI in Forward Switching Power

Long Hongbo

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Abstract

With the development of switching power supply to the direction of high-frequency and integration,the study on its Electro-Magnetic Interference(EMI) has become increasingly important.A conducted EMI analysis model was established for forward switching power supply,and the main sources of interference and interference coupling paths were analyzed.The software Pspice was used to analyze the effect of circuit parameters on EMI.According to result of the analysis,the methods of RP-offset and adding lossless network buffer were proposed to improve the conducted EMI of switching power.Simulation result verified the effectiveness of the method.

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What this paper is about

With the development of switching power supply to the direction of high-frequency and integration,the study on its Electro-Magnetic Interference(EMI) has become increasingly important.A conducted EMI analysis model was established for forward switching power supply,and the main sources of interference and interference coupling paths were analyzed.The software Pspice was used to analyze the effect of circuit parameters on EMI.According to result of the analysis,the methods of RP-offset and adding lossless network buffer were proposed to improve the conducted EMI of switching power.Simulation result verified the effectiveness of the method.

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Available abstract

With the development of switching power supply to the direction of high-frequency and integration,the study on its Electro-Magnetic Interference(EMI) has become increasingly important.A conducted EMI analysis model was established for forward switching power supply,and the main sources of interference and interference coupling paths were analyzed.The software Pspice was used to analyze the effect of circuit parameters on EMI.According to result of the analysis,the methods of RP-offset and adding lossless network buffer were proposed to improve the conducted EMI of switching power.Simulation result verified the effectiveness of the method.

Key concepts: EMI, Electromagnetic interference, Offset (computer science), Electronic engineering, Power (physics), Interference (communication), Power network, Engineering

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