【摘要】 提出一种副边电压应力最小化的LLC谐振变流器拓扑,该拓扑除了具有传统LLC谐振变流器拓扑原边开关容易实现全范围的ZVS、副边二极管容易实现ZCS、谐振电感和变压器容易实现磁集成、宽范围等优点外还具有副边二极管的电压应力以及副边电容的电压应力均为输出电压的一半的优点。所以该拓扑非常适合应用于高压输出的直流电源中。文中详细分析了该变流器的演化过程、工作原理和关键参数的设计方法。最后以一个1100W的实验样机验证了该拓扑的可靠性和实用性。样机的满载效率达到96％以上。更多还原

【Abstract】 Paper presents a topology of LLC resonant converter with minimized voltage stress for secondary side. The advantages, which are featured in conventional LLC converter, i.e. being easy to obtain full range ZVS for primary side switches, being easy to obtain ZCS for secondary side diodes, resonant inductors and transformer being easy to be integrated and wide range application, are taken on in the presented topology as well, furthermore the prominent advantages that voltage stresses of secondary side diodes and secondary side capacitors are half of output voltages are taken on. Therefore this converter is fit for application with the characteristic of high output voltage. Evolvement of this topology, detailed operation principle and design considerations of key parameters are detailed analyzed. Finally, an experimental prototype of 1100W is built to verify the reliability and practicability of the proposed topology. Efficiency of the prototype with full load is above 96%.更多还原