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2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.1 ? 6/1/10 AN-8021 使用 FAN9612 交错式 BCM PFC 控制器建立可变输出电压之 升压型 PFC 转换器 摘要 升压型 PFC 转换器的输出电压设定,必须高於电源的最高输入电压,才能维持升压运作,并且塑造电源供应器输入 电流的波形.针对通用的输入电压的设计,最适当的输出电压选择大约是 400VDC.然而在许多应用中,可能需要根 淙 AC rms 电压位准、转换器的输出功率或这两者来调整输出电压.而FAN9612 交错式 BCM PFC 控制器特 别适合用来实现这种设计,因为使用电压误差放大器的非反相输入端调整转换器的输出电压非常方便.此技术应用 文件将详细说明如何使升压型输出电压成为转换器输出功率的函数.文中并会演示及解说精密程度不同的各种电 路.此外,内容中还将说明升压随耦器概念的设计与实作,此概念是指输出电压成为输入 AC rms 电压位准的函 数. 为什麽要调整 VOUT? 功率因数修正器Power Factor Correctors (PFC)前端 的输出电压,是根矶嘈枨蠛偷缭垂┯ζ鞯牟僮鞑问 来定义.PFC 自输入源开始所产生的功耗是依循正弦 平方函数,而其输出负载实际上是恒定的负载,如图