摘要
最近,带有同步整流电路的有源箝位ZVS-PWM控制串联谐振变换器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。本文通过对其各种工作模态转换的分析,阐明效率下降的原因。为解决这种效率下降,我们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,并分析了他们的稳态特性。并且,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:本文提出的整流电路在一个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)下,获得了85%的较高效率。
A ZVS-PWM controlled current-mode resonant converter previously propsoed includes an active-clamp circuit and a center-tap type synchronous rectifying circuit.This resonant converter has a high efficiency for a specific input voltage.However,as the input voltage varies from the specifec value,the efficiency goes down severely.This paper clarifies the cause of this efficiency drop through the state transition analysis.To overcome the efficiency drop,we propose the usage of current-doubler type synchronous rectifying circuits with separate inductors and with a coupled inductor,and examine their steady-state characteristics.As a consequence,it is clarified that the propsoed redtifying circrits have achieved a high efficiency over 85% for a wide variation of input voltage under the load condition of 3.3V and 5A.
出处
《电源世界》
2002年第5期5-9,24,共6页
The World of Power Supply
关键词
有源箝位
串联谐振
同步整流
active clamp
series-resonant
synchronous rectifier
