大功率变流技术Issue(4)：13-18,6.DOI:10.13889/j.issn.2096-5427.2018.04.003
LLC谐振型软开关变换器轻载效率优化控制
Efficiency Optimization Control Strategy of LLC Resonant Soft-switching Converter at Light Load
周峰武 1张小勇 1饶沛南 1曹金洲 1张庆1
作者信息
- 1. 株洲中车时代电气股份有限公司,湖南 株洲 412001
- 折叠
摘要
Abstract
The light load efficiency of a LLC converter is very low, owing to the traditional PFM control strategy. In order to make the output voltage constant at light load, the working frequency will be increased. So, the turn-off loss will rise and the efficiency will be reduced. With the loss analysis of the LLC converter, it can draw the curves of the efficiency versus the load. It proposed a new burst PWM control strategy to replace the traditional PFM control in this paper. The working frequency is fixed in the full load range. The output voltage stays constant by adjusting the width of the burst pulse. The prototype experimental results show that, with the burst PWM control and working in the best frequency point, the light load efficiency is improved significantly and the full load efficiency is optimal as well.关键词
LLC变换器/软开关/关断损耗/触发PWM控制/轻载效率优化控制Key words
LLC converter/soft switching/turn-off loss/burst PWM control/light load efficiency optimization control分类
信息技术与安全科学引用本文复制引用
周峰武,张小勇,饶沛南,曹金洲,张庆..LLC谐振型软开关变换器轻载效率优化控制[J].大功率变流技术,2018,(4):13-18,6.
