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onsemi.cn 交错式功率因数校正 Interleaved PFC

2 议程 Agenda ? 简介 Introduction: ? 交错式PFC基础知识 Basics of interleaving ? 主要优势 Main benefits ? NCP1631:新颖的交错式PFC控制器 NCP1631: a novel controller for interleaved PFC ? 异相管理 Out-of-phase management ? NCP1631支持使用较小电感 The NCP1631 allows the use of smaller inductors ? 主要功能 Main functions ? 实验结果及性能 Experimental results and performance ? 一般波形 General waveforms ? 能效 Efficiency ? 总结 Summary

3 ? 以两个功率为(Pin(avg)/2)的较小PFC段替代单个较大PFC段Two small PFC stages delivering (Pin(avg) / 2) in lieu of a single big one ? 如果两个相位异相,因此产生的电流(IL(tot))和(ID(tot)) 纹波大幅 减小 If the two phases are out-of-phase, the resulting currents (IL(tot)) and (ID(tot)) exhibit a dramatically reduced ripple. 交错式功率因数校正(PFC) Interleaved PFC EMI Filter Ac line LOAD

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4 交错式PFC优势 Interleaved Benefits ? 所用元器件更多,但More components but: ?

150 W PFC比300 W PFC更易于设计 A 150-W PFC is easier to design than a 300-W one ? 模块化途径 Modular approach ? 散热更好 Better heating distribution ? 扩展临界导电模式(CrM)范围 Extended range for Critical Conduction Mode (CrM) ? 元件尺寸更小,支持纤薄设计 Smaller components (帮助符合严格的外形因数需求,如平板电视 help meet strict form factor needs C e.g., flat panels) ? 两个不连续导电模式(DCM) PFC看上去象一个连续导电模式(CCM) PFC转换器 Two DCM PFCs look like a CCM PFC converter… ? 简化电磁干扰(EMI)滤波,减小输出均方根(rms)电流 Eases EMI filtering and reduces the output rms current

5 输入及输出电流 Input and Output Current EMI Filter Ac line LOAD

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1 D I bulk C ( ) in I t ( ) D tot I 什么是IL(tot)总输 入电流纹波? What is the ripple of the IL(tot) total input current? 什么是ID(tot)总输 出电流纹波? What is the ripple of the ID(tot) total output current?

6 低交流线路时的输入电流纹波 Input Current Ripple at Low Line ? 当输入电压保持低于输出电压的一半时,输入电流看上去象 CCM滞后PFC的输入电流 When Vin remains lower than Vout / 2, the input current looks like that of a CCM, hysteretic PFC ? (IL(tot))在两个接近的正弦迹线间摆动 (IL(tot)) swings between two nearly sinusoidal envelops Peak, averaged and valley current @

90 Vrms,

320 W input (Vout =