针对全桥LLC谐振变换器中的谐振参数,以及变压器原、副边匝比,提出了一种改进的参数设计方法.基于该方法,可以兼顾开关管死区时间、开关管关断电流和实际所用开关管寄生参数的大小,确保实现原边开关管的零电压开通(Zero Voltage Switching,ZVS).在保证ZVS的同时,能够降低开关管关断电流,在一定程度上降低开关管的关断损耗,并可以有效限定变换器的工作频率范围,便于前置滤波器和磁性元件的设计.样机的实验结果证实了所提出参数设计方法的有效性.
Design Method for Full-Bridge LLC Resonant Converter Parameters
An improved design method is proposed for resonant parameters and transformer turns ratio of full-bridge LLC resonant con-verter.By using this method,the dead time,the primary side switch tube turn-off current and the switch tube parasitic parameter can be taken into consideration to ensure zero voltage switching(ZVS)of the primary side switch tube.While guaranteeing the ZVS,the switch tube turn-off current can be decreased to reduce the turn-off loss to a certain extent.The operating frequency range of the converter can be effectively limited to facilitate the more convenient design of pre-filter and magnetic element.The validity of the proposed design method and the conclusions are verified by the experimental results.
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