| Nowadays, with the rapid development and wide application of switching power supply,its electromagnetic interference problem is getting serious caused by small size and highfrequency. This will affect the normal operation of switching power supply and otherequipments or systems, pollute the surrounding electromagnetic environment. Therefore,people draw more attention to the electromagnetic compatibility in switching power supply.DC-DC converter, the core of switching power supply, whose electromagnetic compatibilityhas became a top priority.This topic is imbursed by Natural Science Foundation Committee of Tianjin. This paperis mainly about the conducted interference issues and effective suppression measures. Mainresearch works are as follows:1、According to the study of conducted interference in switching power supply converter,this paper analyzed several common coupling paths and focused on the generation ofconducted interference, based on which the high frequency models of key components ofDC-DC converters were analyzed.2、Analyzed the soft switching technology, snubber circuit technology and EMI filtertechnology. At the same time, a passive soft switching Boost converter was designed, andsimulated in OrCAD 10.5 to compared with the hard switching circuit.3、Based on the parameter design of full bridge converter, the conducted interferencewhile full bridge converter was working at conditions of ZVS and hard switching werecompared through simulation. Analysis shows that the common mode noise of full bridge zerovoltage switch had a greater attenuation at higher frequencies, differential mode noise wasmuch smaller and effectively reduced the conducted interference. |
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