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Research on Electromagnetic Compatibility of Switching Power Supply

Author: FengChao
Tutor: LiWenXing
School: Harbin Engineering University
Course: Electromagnetic Field and Microwave Technology
Keywords: Switching Power Supply Pspice Electromagnetic Compatibility
CLC: TN03
Type: Master's thesis
Year: 2011
Downloads: 270
Quote: 0
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Abstract


With the continuous development of modern science and technology , switching power supply with its small size , high efficiency , high reliability develop extensive . DC-DC Power Module With simple design, change and flexible, high quality and reliable, high reliability and high-tech fields play an irreplaceable important role . But with the increased frequency switching power conversion , switching caused by conduction and radiation interference is more serious, how to suppress the switching power supply electromagnetic interference has been the focus of the study design personnel issues . The topics to ZTE module power development project based, switching power supply as the research object , focus on the switching power supply of electromagnetic interference coupling mechanism and take effective suppression measures . This article describes and discusses the definition of electromagnetic compatibility switching power supply EMI research status . Electromagnetic interference from the three elements starting to discuss switching power supply sources of electromagnetic interference and interference coupling path , analyzed the presence of various coupling mechanisms . Switching power supply for the analysis conducted and radiated disturbances discussed reducing the differential mode and common mode radiation methods . Optimized circuit boards inside high dv / dt circuit nodes , reducing the input side of the AC circuit area method to reduce differential-mode radiation interference ; planning ground plane using the radiation current to ground approach to reduce common -mode radiation interference. Use Pspice software, simulation analysis of the different leakage inductance , different grounding resistors, aluminum plate parasitic capacitance of different cases, conduction disturbances . Gives a reduced conduction disturbances lossless snubber circuit , common mode interference suppression method of compensating inductor design . Simulation results show that the original design of the circuit can effectively reduce the electromagnetic interference produced by the circuit . Produced a 1/ 4 brick , power 100W, input DC voltage 36V ~ 72V, the output 3.3V/30A, frequency of 300kHz switching power supply prototype . Analysis of the design process of the electromagnetic compatibility issues, analysis and test results show that the power in the realization of function parameters based on the requirements , also has good electromagnetic compatibility, in order to verify the theoretical analysis and design ideas are correct.

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