Compared with traditional frequency limitation method DCM and QCFTCM for TCM-based inverter, this article proposes a hybrid TCM method, which can achieve both full range ZVS and frequency variation limitation. An accurate resonant transition model is established and the switching frequency variation range can be obtained for TCM. The hybrid control can be implemented according to the variation ratio γ. In order to determine the optimal γ, an offline optimization algorithm based on loss estimation is proposed. Therefore, an accurate analytical loss model for GaN HEMTs considering the nonlinear junction capacitance is given for TCM and hybrid TCM. The loss model shows that the total losses of hybrid TCM inverter are reduced compared with TCM. Moreover, an interleaved GaN-based megahertz single-phase inverter with digital control is demonstrated with 120 W/in ³ power density. The aforementioned benefits are experimentally verified in the optimal hybrid TCM. With this hybrid control, the measured peak efficiency is 98%. Compared with pure TCM mode, there is a 70% reduction in the switching frequency and the related efficiency is 0.8% higher at light loads. Higher power density (135 W/in ³ ) can be achieved in hybrid TCM through further increasing the switching frequency compared with pure TCM.

中文翻译：

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具有混合TCM控制方法的基于GaN的兆赫兹单相逆变器，可实现高效率和高功率密度

与基于TCM的逆变器的传统频率限制方法DCM和QCFTCM相比，本文提出了一种混合TCM方法，该方法既可以实现全范围ZVS又可以实现频率变化限制。建立了准确的谐振跃迁模型，可以得到中药的开关频率变化范围。可以根据变化率γ实现混合控制。为了确定最优γ，提出了一种基于损耗估计的离线优化算法。因此，针对TCM和混合TCM，给出了考虑非线性结电容的GaN HEMT的精确分析损耗模型。损耗模型表明，与传统TCM相比，混合TCM逆变器的总损耗有所降低。此外， ³功率密度。上述优点在最佳混合中药中得到了实验验证。使用这种混合控制，测得的峰值效率为98％。与纯TCM模式相比，轻载时的开关频率降低了70％，相关效率提高了0.8％。 与纯TCM相比，通过进一步提高开关频率，可以在混合TCM中获得更高的功率密度（135 W / in ³）。