Traditional synchronous rectification (SR) strategies in LLC converters are insufficient to meet the stringent demands imposed by the onboard chargers (OBCs) for plug-in hybrid electric vehicles (PHEVs), which require exceptional cost-efficiency, high performance, safety compliance, bidirectional operation, and the ability to handle high output voltage. In contrast, model-based SR strategies for LLC converters, driven solely by sensed dc signals, offer numerous advantages, including cost-effectiveness and robust immunity to electromagnetic interference (EMI). Nevertheless, the precision of the model significantly impacts the model-based SR strategy’s performance. Furthermore, under light-load conditions, LLC converters may enter a discontinuous current mode (DCM), leading to extended SR conduction time and additional reactive current for model-based SR strategies. To solve such issues, a novel state-plane-analysis-based SR strategy for LLC converters is proposed, enhanced with an online DCM identification algorithm. Leveraging geometric principles and tailored simplifications, analytical expressions are derived for both the SR conduction time and the DCM boundary. The proposed SR strategy exhibits remarkable versatility, spanning the entire frequency range of LLC converters, and offers an exceptional dynamic response. The proposed approach is validated with a 6.6-kW prototype, achieving a rated efficiency of 97.5% and demonstrating a weighted SR timing accuracy of 97.8%.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Geometrical State-Plane-Based Synchronous Rectification Scheme for LLC Converter in EVs


    Beteiligte:
    Chen, Jie (Autor:in) / Xu, Junzhong (Autor:in) / Zhang, Yuxin (Autor:in) / Zhao, Jiancheng (Autor:in) / Hou, Junfeng (Autor:in) / Wang, Yong (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.12.2024


    Format / Umfang :

    4448261 byte




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Synchronous rectification DC-DC converter and switching power supply device

    UNO YOSHIYUKI / MIZUSHIMA YOSHIAKI | Europäisches Patentamt | 2022

    Freier Zugriff

    SYNCHRONOUS RECTIFICATION DC-DC CONVERTER AND SWITCHING POWER SUPPLY DEVICE

    UNO YOSHIYUKI / MIZUSHIMA YOSHIAKI | Europäisches Patentamt | 2020

    Freier Zugriff