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Inventions 2018, 3(4), 77; https://doi.org/10.3390/inventions3040077

Pulse Width and Frequency Hybrid Modulated LLC Converter Adapted to Ultra Wide Voltage Range

1
School of Electronic, Information and Electrical Engineering (SEIEE), Shanghai Jiao Tong University, Shanghai 200240, China
2
Changzhou Power Supply Company, Changzhou 213000, China
*
Author to whom correspondence should be addressed.
Received: 18 September 2018 / Revised: 6 November 2018 / Accepted: 7 November 2018 / Published: 11 November 2018
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Abstract

In wide voltage range applications such as electric vehicles (EVs) onboard charging, conventional frequency modulated LLC topology has its intrinsic limitations. Its frequency span is extremely wide and the soft switching feature might get lost. To address this issue, this paper proposes a novel LLC resonant converter. The pulse width and frequency hybrid modulation are adopted to narrow down its switching frequency span. The operating principles, circuit modeling, and the design methodology are presented. A 1 kW rated prototype has been built to realize an efficient power flow between the 400 V DC bus and 200–440 V battery pack. The designed prototype validates the effectiveness of the proposed topology and modulation method. 96.8% peak efficiency is measured for the constructed experimental prototype. View Full-Text
Keywords: LLC; resonant converter; PWM; EV chargers LLC; resonant converter; PWM; EV chargers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Khalid, U.; Khan, M.M.; Khan, M.Z.; Usman Rasool, M.A.; Xu, J. Pulse Width and Frequency Hybrid Modulated LLC Converter Adapted to Ultra Wide Voltage Range. Inventions 2018, 3, 77.

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