A Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-Voltage Range Applications
A Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-Voltage Range Applications
复制标题
具有两个变压器的改进型高效 LLC 转换器,适用于宽输入电压范围应用
DOI:
10.1109/tpel.2012.2201959
复制
发表时间:
2013-04
影响因子:
6.7
通讯作者:
胡海兵
中科院分区:
文献类型:
--
作者:
胡海兵
This paper proposed a modified LLC converter with two transformers in series, which has four operation configurations, covering the range of four times the minimum input voltage. To optimize the proposed LLC converter in an attempt to achieve good efficiency, a numerical method is developed based on the LLC converter's steady-state equations. In order to minimize the magnetizing current and thus minimize the conduction and core losses, an optimal objective is proposed to find the maximum magnetizing inductance. An optimization procedure and a design example are given. A 250-W 210-V output prototype with input voltage ranging from 25 to 100 V is built to verify the developed numerical model and optimal design method. The dc gain obtained from experimental data agrees pretty well with that from the developed numerical model. Two conventional LLC converters are designed using fundamental harmonic approximation and the proposed optimal design, respectively, to make comparison with the proposed LLC converter and validate the proposed optimal design. Experimental results show that the proposed converter with proposed optimal design can achieve the peak efficiency up to 98%, while maintaining a very wide input voltage range.
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