A Holistic Design Optimization Method for LLC Converters in Light Electric Vehicle Chargers

Abdulsamed Lordoglu, Mehmet Onur Gulbahce, Derya Ahmet Kocabas, Serkan Dusmez

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The passive components of LLC resonance converters are traditionally designed based on a resonance frequency and switching frequency range considering required voltage conversion rate while ensuring zero-voltage-switching of the primary side power devices. Afterwards, the sub-elements such as transformer, power stage, and heat-sink are locally designed. However, this may only lead to locally optimized designs. In this paper, a systematic design framework is proposed that attempts to determine the resonance frequency by considering non-linear battery load profile, power loss, volume and cost of all main components. To achieve smaller sized transformer, a series connected primary and parallel connected secondary windings with a multi-core configuration is also considered. The proposed algorithm aids designers to optimally size the LLC, and provides a step-by-step design methodology. An LLC stage of a light electric vehicle battery charger converting 370 V- 430 V to an output voltage range of 36 V- 54 V rated at 3700 W with a peak efficiency of 98.2% has been designed validating the proposed design procedure.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Transactions on Transportation Electrification
Publication statusAccepted/In press - 2023

Bibliographical note

Publisher Copyright:


  • Battery charger
  • electric vehicle
  • Frequency conversion
  • LLC resonance converter
  • Magnetics
  • magnetics
  • Optimization
  • optimization
  • power converter
  • Resonant frequency
  • Switching frequency
  • Transformers
  • Voltage


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