摘要
最近,对带有同步整流电路的有源箝位ZVS-PWM控制串联谐振变换器的研究和应用不断取得进展,不过,当输入电压偏离特定值时,其效率会严重下降。通过对其各种工作模态转换的分析,阐明了效率下降的原因,为解决这种效率下降,使用了带有分立电感和耦合电感的倍流型同步整流电路模型,并分析了其稳态特性。通过实验,比较了中心抽头型和耦合电感型效率变化曲线,最后,通过分析和比较,得出结论,提出了一个整流电路,在较大输入电压范围内和低输出电压,大输出电流的负载条件(3.3V,5A)
A ZVS-PWM controlled current-mode resonant converter recently propsoed includes an active-clamp cireint and a center-tap synchronous rectifying circuit. This resonant converter has a high effierency for a specifie mpnt voltage However. as the mput voltage varies from the spceifec value,the effielency goes down severely The cause of this efficlency drop is clarified through the slate transition analysis. To overcome the efficiency drop.the tisage of current-doubler lype syndronous rectifying eireuits with separate inductors and with a coupled inductor is proposed, and their steadv-slate charac teristies are analyzed. As a consequence, it is elarified that the propsoed rectifying cirents have achieved a high efferency over 85% for a wide variation of mput voltage under the load tondtion of 3. 3V and 5A.
出处
《电源技术应用》
2002年第10期28-32,共5页
Power Supply Technologles and Applications
