[1]周峰武,张小勇,饶沛南,等.LLC 谐振型软开关变换器轻载效率优化控制[J].控制与信息技术(原大功率变流技术),2018,(04):13-18.[doi:10.13889/j.issn.2096-5427.2018.04.003]
 ZHOU Fengwu,ZHANG Xiaoyong,RAO Peinan,et al.Efficiency Optimization Control Strategy of LLC Resonant Soft-switching Converter at Light Load[J].High Power Converter Technology,2018,(04):13-18.[doi:10.13889/j.issn.2096-5427.2018.04.003]
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LLC 谐振型软开关变换器轻载效率优化控制()
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《控制与信息技术》(原《大功率变流技术》)[ISSN:2095-3631/CN:43-1486/U]

卷:
期数:
2018年04期
页码:
13-18
栏目:
电力及传动控制
出版日期:
2018-08-05

文章信息/Info

Title:
Efficiency Optimization Control Strategy of LLC Resonant Soft-switching Converter at Light Load
文章编号:
2096-5427(2018)04-0013-06
作者:
周峰武张小勇饶沛南曹金洲张 庆
(株洲中车时代电气股份有限公司,湖南 株洲 412001)
Author(s):
ZHOU Fengwu ZHANG Xiaoyong RAO PeinanCAO Jingzhou ZHANG Qing
( Zhuzhou CRRC Times Electric Co., Ltd., Zhuzhou, Hunan 412001, China)
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
Keywords:
LLC converter soft switching turn-off loss burst PWM control light load efficiency optimization control
分类号:
TM46
DOI:
10.13889/j.issn.2096-5427.2018.04.003
文献标志码:
A
摘要:
LLC 谐振型软开关变换器在轻载时的效率很低,这是由传统的调频控制方式决定的:轻载时为了稳定输出电压会增加工作频率,进而使变换器关断损耗增加从而降低效率。文章通过分析LLC 变换器损耗得到变换器效率负载特性曲线,提出一种使用触发控制结合PWM 调制的方法来代替传统的调频控制法,使电路在全负载范围内以某一固定频率工作,通过调节触发脉冲的占空比来稳定输出电压,最终实现全负载范围内的效率最优化。样机实验结果表明,LLC 变换器采用触发PWM 控制、工作在最佳频率点策略后,不仅轻载时效率得到显著提高,而且满载效率也可以达到最优。
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.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-05-03
作者简介:周峰武(1986-),男,博士,工程师,研究方向为电力电子与电力传动。
更新日期/Last Update: 2018-08-17