An Interleaved LLC Resonant Converter Operating at Constant Switching Frequency
An Interleaved LLC Resonant Converter Operating at Constant Switching Frequency
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DOI：
10.1109/ecce.2012.6342315
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发表时间：
2012-09
影响因子：
6.7
通讯作者：
Zhiyuan Hu;Ya-jie Qiu;Laili Wang;Yanfei Liu
中科院分区：
文献类型：
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作者：
Zhiyuan Hu;Ya-jie Qiu;Laili Wang;Yanfei Liu
交错技术对于 LLC 谐振转换器实现高功率水平是必要的。其优点包括扩大功率容量、降低输出纹波电流以及通过使用切相提高轻载效率。然而，如果所有相都以相同的开关频率运行，传统的频率控制 LLC 转换器将失去各个相的调节，从而导致负载分配问题。现有的交错式 LLC 转换器负载共享解决方案均存在局限性。本文提出了一种开关控制电容器（SCC）调制LLC转换器（SCC-LLC）来解决负载共享问题。通过恒定的开关频率，可以实现交错和切相。搭建了 600W 两相交错恒频 SCC-LLC 原型机来验证可行性并展示其优势。
The interleaving technique is necessary for LLC resonant converters to achieve high power level. The advantages include expanded power capacity, lower output ripple current, and higher light-load efficiency by using phase shedding. However, conventional frequency-controlled LLC converters will lose regulation in individual phases if all the phases are operating at the same switching frequency, causing load sharing problem. Existing load sharing solutions for interleaved LLC converters all have limitations. In this paper, a switch-controlled capacitor (SCC) modulated LLC converter (SCC-LLC) is presented to solve the load-sharing problem. With constant switching frequency, interleaving and phase shedding can be achieved. A 600-W, two-phase interleaved constant frequency SCC-LLC prototype is built to verify the feasibility and demonstrate the advantages.