LLC DC-DC Converter with Flyback-Operation for Expanding the Regulation Range

被引：0
|
作者：
Nakashima, Hiroki [1 ]
Kato, Hisatsugu [1 ,2 ]
Araki, Yohei [1 ]
Ishizuka, Yoichi [1 ]
机构：
[1] Nagasaki Univ, Grad Sch Engn, Nagasaki, Japan
[2] Tabuchi Elect Co LTD, Osaka, Japan
来源：
THIRTY-FOURTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2019) | 2019年
关键词：
LLC resonance DC-DC converter; regulation range; light load; Flyback-operation;
D O I：
暂无
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
LLC DC-DC converter can achieve high power efficiency because ZVS operation is possible in wide load range. However, when the load is light, and the input voltage is high, the operating frequency is becoming too high. Therefore, it is not suitable for applications with a frequency limit. Furthermore, it leads to high dv / dt, leading to lower reliability as power supply and EMI problem. Therefore, in this paper, it is proposed a control method that maintains regulation while suppressing the frequency increase at the time of light load of the secondary side synchronous rectification LLC DC-DC converter. Only the control method applied to the conventional circuit. Since the operation is similar to the flyback converter, it is called "flyback-operation" In the prototype experimental circuit of 48 V / 5 V - 200 W specification, the input voltage range can be increased by 23% when the load current is 0.75 A.
引用
收藏
页码：2228 / 2233
页数：6
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