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串联谐振变换器中提高同步整流效率的研究
瞿成明,王慧贞
作者单位
摘要:
当输入电压偏离特定值时,有源箝位零电压开关的脉宽调制ZVS-PWM(Zero Voltate Switch-Pulse Width Modulation)控制串联谐振变换器效率会严重下降。为解决这种效率下降,使用了带有分立电感和偶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偶合电感型效率变化曲线。通过分析和比较,得出结论: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,其效率高达85%。
关键词:  串联谐振变换器 同步整流效率 同步整流电路 有源箝位
DOI:
分类号:TN624 TM461
基金项目:
Synchronous rectifier efficiency improvement for series-resonant converter
QU Cheng ming  WANG Hui zhen
Abstract:
For a ZVS PWM(Zero Voltage Switch-Pulse Width Modulation) controlled series resonant converter,when the input voltage deflects from the specific value the efficiency goes down severely.The double current synchronous rectifying circuits with separate or coupled inductors are applied to overcome the efficiency drop.Their steady state characteristics are examined.The efficiency curves of rectifiers with central tap and coupled inductor are compared via experiments.It is clarified that the proposed rectifying circuits obtain a high efficiency over 85% within a wide input voltage range and with the load conditions of low output voltage and big output current(3.3 V and 5 A).
Key words:  active clamp,series resonance,synchronous rectifying

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