DM EMI Noise Analysis for Single Channel and Interleaved Boost PFC in Critical Conduction Mode

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dc.contributor.authorWang, Zijianen
dc.contributor.committeechairLee, Fred C.en
dc.contributor.committeememberBoroyevich, Dushanen
dc.contributor.committeememberWang, Shuoen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:36:41Zen
dc.date.adate2010-06-11en
dc.date.available2014-03-14T20:36:41Zen
dc.date.issued2010-04-30en
dc.date.rdate2010-06-11en
dc.date.sdate2010-05-13en
dc.description.abstractThe critical conduction mode (CRM) power factor correction converters (PFC) are widely used in industry for low power offline switching mode power supplies. For the CRM PFC, the main advantage is to reduce turn-on loss of the main switch. However, the large inductor current ripple in CRM PFC creates huge DM EMI noise, which requires a big EMI filter. The switching frequency of the CRM PFC is variable in half line cycle which makes the EMI characteristics of the CRM PFC are not clear and have not been carefully investigated. The worst case of the EMI noise, which is the baseline to design the EMI filter, is difficult to be identified. In this paper, an approximate mathematical EMI noise model based on the investigation of the principle of the quasi-peak detection is proposed to predict the DM EMI noise of the CRM PFC. The developed prediction method is verified by measurement results and the predicted DM EMI noise is good to evaluate the EMI performance. Based on the noise prediction, the worst case analysis of the DM EMI noise in the CRM PFC is applied and the worst case can be found at some line and load condition, which will be a great help to the EMI filter design and meanwhile leave an opportunity for the optimization of the whole converter design. What is more, the worst case analysis can be extended to 2-channel interleaved CRM PFC and some interesting characteristics can be observed. For example, the great EMI performance improvement through ripple current cancellation in traditional constant frequency PFC by using interleaving techniques will not directly apply to the CRM PFC due to its variable switching frequency. More research needs to be done to abstract some design criteria for the boost inductor and EMI filter in the interleaved CRM PFC.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05132010-232753en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05132010-232753/en
dc.identifier.urihttp://hdl.handle.net/10919/32719en
dc.publisherVirginia Techen
dc.relation.haspartWang_Z_T_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectEMI noiseen
dc.subjectQuasi-peak detectionen
dc.subjectMathematical predictionen
dc.subjectCritical conduction modeen
dc.subjectInterleaved boost PFCen
dc.titleDM EMI Noise Analysis for Single Channel and Interleaved Boost PFC in Critical Conduction Modeen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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