LLC谐振变换器的稳健性设计
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摘要
设置合理的死区时间是保证LLC谐振变换器实现零电压开通(ZVS)的重要环节。实际工程应用中,由于加工工艺分散性等原因,谐振槽元器件参数值会存在一定的波动,导致同一批次产品的理论死区时间范围不尽相同且难以确定,从而无法保证批量产品实现软开关性能的一致性。文章首先对ZVS型LLC谐振变换器的死区时间设置范围进行理论推导和分析;然后采用以正交设计、信噪比分析方法为基础的田口设计方法对LLC谐振参数的中心值和容差进行了基于死区时间上下限范围的稳健性优化设计;最后,通过蒙特卡洛方法产生大量虚拟样本对设计结果进行了仿真验证。结果表明,优化后的谐振参数设计方案大大降低了结电容放电时间和谐振电流反向时间的波动分散性,加大了死区时间选择的窗口裕度,提高了该型LLC谐振变换器在全负载范围内实现软开关性能的一致性能力。
Setting a reasonable dead time is an important condition to ensure that ZVS type LLC converters achieve soft switch.In practical engineering, parameters of the resonant tank components will fluctuate due to the dispersion of processing technology,the theoretical dead time range varies from product to product. Thus, it is difficult to determine a fixed dead time to ensure consistent performance of soft switching performance for batch products. In this paper, theoretical derivation and analysis of the dead time setting range of ZVS type resonant converter was firstly carried out. Then, the Taguchi design method based on orthogonal design and SNR analysis was used to optimize the center value and tolerance of LLC resonance parameters about the upper and lower limits of dead time.Finally, a large number of virtual samples were generated by Monte Carlo method to verify the design results. The optimized resonant parameter design greatly reduces the dispersion of the junction capacitance release time and the resonant current reverse time, increases window margin for dead time selection,and improves the ability of this converter to achieve soft switching performance consistency over the full load range.
Setting a reasonable dead time is an important condition to ensure that ZVS type LLC converters achieve soft switch.In practical engineering, parameters of the resonant tank components will fluctuate due to the dispersion of processing technology,the theoretical dead time range varies from product to product. Thus, it is difficult to determine a fixed dead time to ensure consistent performance of soft switching performance for batch products. In this paper, theoretical derivation and analysis of the dead time setting range of ZVS type resonant converter was firstly carried out. Then, the Taguchi design method based on orthogonal design and SNR analysis was used to optimize the center value and tolerance of LLC resonance parameters about the upper and lower limits of dead time.Finally, a large number of virtual samples were generated by Monte Carlo method to verify the design results. The optimized resonant parameter design greatly reduces the dispersion of the junction capacitance release time and the resonant current reverse time, increases window margin for dead time selection,and improves the ability of this converter to achieve soft switching performance consistency over the full load range.
引文
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[3]ISLAM M S,ISLAM R,SEBASTIAN T,et al.Cogging Torque Minimization in PM Motors Using Robust Design Approach[J].IEEE Transactions on Industry Applications,2010,47(4):1661-1669.
[4]郭宏,钱浩.永磁同步电机低转矩脉动的稳健设计[J].中国电机工程学报,2012,32(24):88-95.
[5]翟国富,崔行磊,杨文英.电磁继电器产品及研究技术发展综述[J].电器与能效管理技术,2016(2):1-8.
[6]陈立周.稳健设计[M].北京:机械工业出版社,2000.
[7]文放怀.田口方法[M].广州:广东经济出版社,2006.
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