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
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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
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发表时间:
2013-04
影响因子:
6.7
通讯作者:
胡海兵
胡海兵
中科院分区:
工程技术1区
文献类型:
--
作者:
胡海兵

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本文提出了一种改进的带有两个串联变压器的 LLC 转换器,它有四种工作配置,覆盖最小输入电压四倍的范围。为了优化所提出的 LLC 转换器以实现良好的效率,我们开发了一种基于 LLC 转换器稳态方程的数值方法。为了最大限度地减少磁化电流,从而最大限度地减少传导和磁芯损耗,提出了一个最佳目标,即找到最大磁化电感。给出了优化过程和设计实例。构建了输入电压范围为 25 至 100V 的 250W 210V 输出原型,以验证所开发的数值模型和优化设计方法。从实验数据获得的直流增益与从开发的数值模型获得的直流增益非常吻合。分别使用基波谐波近似和所提出的优化设计设计了两个传统的 LLC 转换器,与所提出的 LLC 转换器进行比较并验证所提出的优化设计。实验结果表明,采用优化设计的转换器可以实现高达 98% 的峰值效率,同时保持非常宽的输入电压范围。
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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