摘要
研究了反激同步整流电路中倒灌电流对DC/DC电源模块中功率管的危害,分析了同步整流电路在容性负载条件下快速启动和关断过程中倒灌电流形成原因及电流大小,提出了次级同步MOS管在启动阶段延迟导通、在关电阶段快速关断的方案,控制了反激同步整流电源模块的倒灌电流。采用该控制方案设计了一种6 V/10 A输出的反激同步整流模块。仿真和实测结果表明,倒灌电流的抑制效果明显。
The harm of backflow current to the power tube of DC/DC power module in the flyback synchronous rectifier were studied. The causes and magnitude of the backflow current in the process of the rapid restart and shutdown of the synchronous rectifier under capacitive load were analyzed. A scheme of delayed turn-on of secondary synchronous MOSFET in start-up stage and fast turn-off in power-off stage was proposed, and the backflow current of flyback synchronous rectifier power module was controlled. A flyback synchronous rectifier module with 6 V/10 A output was designed based on this control scheme. The results of simulation and measurement showed that the inhibition effect of reverse current was obvious.
作者
张纯亚
蒋云杨
付鹏
ZHANG Chunya;JIANG Yunyang;FU Peng(The 24th Research Institute of China Electronics Technology Group Corporation,Chongqing 400060,P.R.China)
出处
《微电子学》
CAS
北大核心
2021年第6期872-877,共6页
Microelectronics
基金
模拟集成电路国家级重点实验室基金资助项目(9140C090113150C09043)。
关键词
同步整流
倒灌电流
容性负载
反激
synchronous rectifier
backflow current
capacitive load
flyback
