NDLI: Efficiency improvement at light load in bidirectional DC-DC converter by utilizing discontinuous current mode

Content Provider	IEEE Xplore Digital Library
Author	Hoai Nam Le Sato, D. Orikawa, K. Itoh, J.-I.
Copyright Year	2015
Description	Author affiliation: Nagaoka Univ. of Technol., Nagaoka, Japan (Hoai Nam Le; Sato, D.; Orikawa, K.; Itoh, J.-I.)
Abstract	This paper proposes a feedback current control for bidirectional DC-DC converter which is operated in Discontinuous Current Mode (DCM) at light load and Continuous Current Mode (CCM) at heavy load in order to improve light load efficiency. In the proposed method, the nonlinearity compensation for DCM operation is constructed by using the duty ratio at previous calculation period. Moreover, the introduction of DCM current feedback control into bidirectional power conversion is accomplished by detecting the operation mode at the output of the control system. This make the control becomes parameter-independent. The validity of the proposed control is confirmed by a 1-kW prototype. In the ramp response, the slope of the DCM current almost agrees to the design value with the error of 0.8%. Moreover, the smooth transition among 4 current modes: CCM-powering, DCM-powering, DCM-generation, CCM-generation, is also confirmed. On the other hand, in order to further improve the efficiency at light load, the synchronous switching for DCM is proposed. As a result, at load of 0.1 p.u. the efficiency of the DCM synchronous switching is improved by 1.5% from 97.2% to 98.7% compared with the CCM synchronous switching. Besides, it is confirmed that, the efficiency of the CCM/DCM synchronous switching is higher by 0.2% than that of the CCM/DCM asynchronous switching at all range of load. Furthermore, the efficiency at rated load is 98.8%, whereas the maximum efficiency is 99.0% at load of 0.45-0.65 p.u.
Starting Page	1
Ending Page	10
File Size	1236091
Page Count	10
File Format	PDF
e-ISBN	9789075815221
DOI	10.1109/EPE.2015.7309366
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-08
Publisher Place	Switzerland
Access Restriction	Subscribed
Rights Holder	EPE Association and IEEE
Subject Keyword	Current control Transfer functions Switches DC-DC power converters Integrated circuit modeling Inductors
Content Type	Text
Resource Type	Article

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