NDLI: Modified LLC resonant converter with secondary paralleled bidirectional switch for applications with hold-up time requirement

Content Provider	IET Digital Library
Author	Sun, Wenjin Wu, Hongfei Hu, Haibing Xing, Yan
Abstract	For applications with hold-up time requirement, the conventional LLC converter requires a small magnetising inductance L m to provide enough output voltage gain under the hold-up operation. However, it deteriorates the efficiency in normal operation. Different from the conventional one, the proposed converter has a bidirectional switch paralleled with the secondary winding of the transformer. In normal operation, the secondary bidirectional switch remains off, and the proposed converter works around the resonant frequency f r as the conventional one. While during the hold-up time, the converter provides sufficient output voltage gain with phase-shift control between primary and secondary switches. However, its output voltage gain is mainly determined by the phase shift angle φ and the normalised load p on but not the L m. Then it can have a larger L m than the conventional LLC converter, decreasing primary conduction and turn-off losses, and improving the efficiency in normal operation. A 200 V/420 W prototype was built, and experimental results show that the efficiency can be improved by 1% compared with the conventional LLC converter in normal operation, which has verified the effectiveness of the proposed solution.
Starting Page	398
Ending Page	404
Page Count	7
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 3, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0570
Journal	IET Power Electronics
Publisher Date	2017-03-10
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System Inductance LC Circuit LLC Resonant Converter Magnetising Inductance Output Voltage Gain Phase Shift Control Power 420 W Power Converter Power Electronics Power Supplies to Apparatus Power Supply Primary Switches Resonant Frequency Resonant Power Converter Secondary Paralleled Bidirectional Switch Secondary Switches Supervisory Circuit Switching Converter Transformer Winding Transformer Windings Voltage 200 V
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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