Steady-state analysis of the LLC series resonant converter
Steady-state analysis of the LLC series resonant converter
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DOI：
10.1109/apec.2001.912451
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发表时间：
2001-03
期刊：
影响因子：
--
通讯作者：
J. Lazar;R. Martinelli
中科院分区：
文献类型：
--
作者：
J. Lazar;R. Martinelli
分析LLC串联谐振变换器的工作模式，确定稳态工作点和模式边界。三元件LLC串联谐振变换器通过在基本的两元件串联谐振变换器拓扑结构上添加电感来实现。与严格限于降压操作的两元件串联谐振转换器不同，LLC转换器能够升压和降压。宽范围的输出功率仅以工作频率的窄变化来控制。此外，零电压开关可以在整个工作范围内实现。所有这些期望的特性基本上是免费获得的，因为附加的谐振电感器可以简单地通过在主功率Transformer中引入气隙来实现。
The operating modes of the LLC series resonant converter are analyzed to determine the steady-state operating point and mode boundaries. The three-element LLC series resonant converter is realized by adding an inductor to the basic two-element series resonant converter topology. Unlike the two element series resonant converter, which is limited strictly to step down operation, the LLC converter is capable of both step up and step-down. A wide range of output power is controlled with only a narrow variation in operating frequency. In addition, zero-voltage switching can be achieved over the entire operating range. All of these desirable properties are obtained essentially for free, as the additional resonant inductor can be realized simply by introducing an air gap in the main power transformer.