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Conference Paper: A model to analyze and improve dynamic response of high light load efficiency multi-mode converters

TitleA model to analyze and improve dynamic response of high light load efficiency multi-mode converters
Authors
Issue Date2009
Citation
2009 Ieee 6Th International Power Electronics And Motion Control Conference, Ipemc '09, 2009, p. 1372-1377 How to Cite?
AbstractReduced switching frequency peak current mode is a popular method to boost up light load efficiency of isolated power converters. However, transient response decreases dramatically when low switching frequency is adopted. This paper covers small signal analysis of control scheme that peak current and switching frequency both modulated by the control signal. An interesting result is found that the control scheme can be decomposed into two parts: peak current mode part and frequency modulation mode part. At low switching frequency light load conditions the bandwidth from control to output is low. According to the proposed model, special design on voltage control oscillator is desirable to boost up the bandwidth at light load conditions. By the time domain concept the switching frequency should be designed to rise quickly during step up transient in order to overcome the drawbacks caused by low switching frequency and prevent transformer saturation. Experimental prototype Two-FET-Forward converter is build to verify the proposed idea. ©2009 IEEE.
DescriptionIPEMC International Power Electronics & Motion Control Conference
Persistent Identifierhttp://hdl.handle.net/10722/62107
References

 

DC FieldValueLanguage
dc.contributor.authorRuiyang, Yen_HK
dc.contributor.authorPong, MHen_HK
dc.date.accessioned2010-07-13T03:54:02Z-
dc.date.available2010-07-13T03:54:02Z-
dc.date.issued2009en_HK
dc.identifier.citation2009 Ieee 6Th International Power Electronics And Motion Control Conference, Ipemc '09, 2009, p. 1372-1377en_HK
dc.identifier.urihttp://hdl.handle.net/10722/62107-
dc.descriptionIPEMC International Power Electronics & Motion Control Conferenceen_HK
dc.description.abstractReduced switching frequency peak current mode is a popular method to boost up light load efficiency of isolated power converters. However, transient response decreases dramatically when low switching frequency is adopted. This paper covers small signal analysis of control scheme that peak current and switching frequency both modulated by the control signal. An interesting result is found that the control scheme can be decomposed into two parts: peak current mode part and frequency modulation mode part. At low switching frequency light load conditions the bandwidth from control to output is low. According to the proposed model, special design on voltage control oscillator is desirable to boost up the bandwidth at light load conditions. By the time domain concept the switching frequency should be designed to rise quickly during step up transient in order to overcome the drawbacks caused by low switching frequency and prevent transformer saturation. Experimental prototype Two-FET-Forward converter is build to verify the proposed idea. ©2009 IEEE.en_HK
dc.languageengen_HK
dc.relation.ispartof2009 IEEE 6th International Power Electronics and Motion Control Conference, IPEMC '09en_HK
dc.titleA model to analyze and improve dynamic response of high light load efficiency multi-mode convertersen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailPong, MH:mhp@eee.hku.hken_HK
dc.identifier.authorityPong, MH=rp00163en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1109/IPEMC.2009.5157598en_HK
dc.identifier.scopuseid_2-s2.0-77951143859en_HK
dc.identifier.hkuros162734en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77951143859&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.spage1372en_HK
dc.identifier.epage1377en_HK
dc.identifier.scopusauthoridRuiyang, Y=35230851000en_HK
dc.identifier.scopusauthoridPong, MH=7003449364en_HK

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