【摘要】 为了使LLC谐振变换器适用于高调整率要求的多路输出场合,利用“分时”的方法,同时采用两个饱和电感将磁放大后级调整技术应用于LLC谐振型变换器。分析了在LLC谐振变换器中磁放大器死区问题对调整率产生的影响,通过理论分析和实验证明了磁放大器死区问题在LLC谐振变换器中的影响要比反激型变换器中小得多,制作了310V输入,24V/3A和12V/2A输出的实验样机,实验结果证明带有磁放大后级调整技术的LLC谐振变换器仍旧具有全范围的零电压开关条件,并且具有极佳的交叉调整率,满载效率达到88.5%。更多还原

【Abstract】 Strategy of time-sharing was adopted in LLC resonant converter for increasing the adaptability of the very topology to such application as multi-output with high regulation requirement, meanwhile strategy of magamp post regulation was applied by adding two saturable reactors in secondary side as well. The influence generated by dead-time of magamp involved in LLC resonant converter on regulation was analyzed in detail in the paper. It is verified both by principle analysis and experimental results that the influence of dead-time problem existing in magamp in flyback converter is much worse than in LLC resonant converter. An experimental prototype of 310V input, 24V/3A and 12V/2A outputs, whose full load efficiency reaches 88.5%, was built to verify achievement of ZVS at full range and the wonderful cross regulation.更多还原