NDLI: A Novel Low-Loss Modulation Strategy for High-Power Bidirectional Buck <formula formulatype=inline> <tex Notation=TeX>${bm +}$</tex></formula> Boost Converters

Content Provider	IEEE Xplore Digital Library
Author	Waffler, S. Kolar, J.W.
Copyright Year	1986
Abstract	A novel, low-loss, constant-frequency, zero-voltage-switching (ZVS) modulation strategy for bidirectional, cascaded, buck-boost DC-DC converters, used in hybrid electrical vehicles or fuel cell vehicles (FCVs), is presented and its benefits over state-of-the-art converters and soft-switching solutions are discussed in a comparative evaluation. To obtain ZVS with the proposed modulation strategy, the buck+boost inductance is selected and the switches are gated in a way that the inductor current has a negative offset current at the beginning and the end of each pulse period. This allows the MOSFET switches to turn on when the antiparallel body diode is conducting. As the novel modulation strategy is a software-only solution, there are no additional expenses for the active or passive components compared to conventional modulation implementations. Furthermore, an analytical and simulation investigation predicts an excellent efficiency over the complete operating range and a higher power density for a nonisolated multiphase converter equipped with the low-loss modulation. Experimental measurements performed with 12 kW, 17.4 kW/L prototypes in stand-alone and multiphase configuration verify the low-loss operation over a wide output power range and a maximum efficiency of 98.3% is achieved.
Sponsorship	IEEE Power Electronics Society
Starting Page	1589
Ending Page	1599
Page Count	11
File Size	1318556
File Format	PDF
ISSN	08858993
Volume Number	24
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Zero voltage switching DC-DC power converters Fuel cell vehicles Pulse modulation Switches Hybrid electric vehicles Inductance Inductors MOSFET circuits Diodes power conversion DC--DC power conversion fuel cells
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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