Gallium nitride enhancement-mode high electron mobility transistors (GaN E-HEMTs) can achieve high frequency and high efficiency due to its excellent switching performance compared with conventional Si transistors. Nevertheless, GaN HEMTs exhibit a more pronounced dynamic ON-state resistance $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ than silicon transistors. The variation of $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ is caused by both the static $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ due to junction temperature rise and the dynamic $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ due to the electron trapping. Without a careful decoupling analysis, it is difficult to calculate and model the dynamic $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ portion. This article introduces a comprehensive approach of dynamic $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ evaluation comprising four techniques: 1) a clamping circuit for both the hard-switching (HS) device and synchronous rectification (SR) device; 2) a junction temperature monitoring technique; 3) control of both the pulse test and soak time; and 4) continuous operation of device under test. Based on the dynamic $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ test results, a new model of the $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ variation is developed where two coefficients $k_{T{j}}$ and $k_{\mathrm {dR}}$ are defined to model the contribution of the heating effect and the impact of the trapping effect, respectively. The $R_{\mathrm {DS}(\mathrm{\scriptscriptstyle ON})}$ model is validated by the comparison between the calculated and measured junction temperatures of a 650-V/30-A GaN-based half-bridge. Furthermore, a detailed loss breakdown analysis is conducted for the GaN-based HS half-bridge. The results show that the switching losses, $E_{\mathrm{\scriptscriptstyle ON}}$ and $E_{\mathrm{\scriptscriptstyle OFF}}$ , are the dominant loss factors with high switching frequency. At last, the possible efficiency improvements are also discussed in detail.


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    Titel :

    Power Loss Characterization and Modeling for GaN-Based Hard-Switching Half-Bridges Considering Dynamic on-State Resistance


    Beteiligte:
    Hou, Ruoyu (Autor:in) / Shen, Yanfeng (Autor:in) / Zhao, Hui (Autor:in) / Hu, Hao (Autor:in) / Lu, Juncheng (Autor:in) / Long, Teng (Autor:in)


    Erscheinungsdatum :

    2020-06-01


    Format / Umfang :

    5506437 byte




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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