In the application of bidirectional LLC -DCX converter, synchronous turn-on and turn-off modulation can be adopted to simplify the control. In view of zero-voltage switching (ZVS) performance, conventionally, the magnetizing inductance is regarded as a current source to discharge output capacitance of primary switches, neglecting the effect of secondary output capacitance and load, which leads to insufficient accuracy and non-ZVS. This article presents the ZVS analysis and design for half-bridge LLC -DCX converter with consideration of nonlinear capacitance and different load values under the synchronous turn-on and turn-off modulation. With consideration of nonlinear capacitance and different load values, the charging and discharging process of the output capacitance during the dead time is analyzed in detail. The analysis indicates that the ZVS conditions are not only affected by the dead time and magnetizing inductance as in the previous study but also related to the load and other parameters. Based on in-depth analysis, more precise ZVS conditions on the magnetizing inductance, dead time, load, and resonant parameters are revealed. In addition, based on the obtained ZVS conditions, the guidance for parameters design is given to achieve full-load-range ZVS. Finally, the effectiveness of the proposed solution has been verified through experimental results.

中文翻译：

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同步开关调制下考虑非线性电容和不同负载的半桥双向LLC-DCX变换器ZVS分析与设计

在双向LLC-DCX转换器的应用中，可以采用同步开通和关断调制来简化控制。考虑到零电压开关（ZVS）性能，传统上，将励磁电感作为电流源对初级开关的输出电容进行放电，忽略了次级输出电容和负载的影响，导致精度不足和非零电压开关. 本文介绍了在同步开关调制下考虑非线性电容和不同负载值的半桥LLC-DCX转换器的ZVS分析和设计。考虑非线性电容和不同负载值，详细分析了死区期间输出电容的充放电过程。分析表明，ZVS 条件不仅像之前的研究那样受死区时间和磁化电感的影响，而且还与负载和其他参数有关。在深入分析的基础上，揭示了关于磁化电感、死区时间、负载和谐振参数的更精确的 ZVS 条件。此外，根据得到的ZVS条件，给出了参数设计的指导，以实现满载范围的ZVS。最后，通过实验结果验证了所提方案的有效性。此外，根据得到的ZVS条件，给出了参数设计的指导，以实现满载范围的ZVS。最后，通过实验结果验证了所提方案的有效性。此外，根据得到的ZVS条件，给出了参数设计的指导，以实现满载范围的ZVS。最后，通过实验结果验证了所提方案的有效性。