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    • 5. 发明申请
    • POWER FACTOR CORRECTION CIRCUIT
    • 功率因数校正电路
    • WO2009025517A2
    • 2009-02-26
    • PCT/KR2008/004901
    • 2008-08-22
    • SILICON MITUS, INC.LEE, Jae Hoon
    • LEE, Jae Hoon
    • G05F1/70
    • G05F1/70
    • The present invention relates to a power factor correction circuit that can reduce distortion of input current in a switching mode power supply. The power factor correction circuit provided in the present invention basically comprises a first inductor which is electrically connected at a first end thereof to an input terminal, a second coil that is coupled to the first inductor to form an induced voltage, a switch electrically connected to the a second terminal of the first inductor, and a switching control unit for controlling turn-on and turn-off of the switch. In such a power factor correction circuit of the present invention, the switching control unit is configured to differently set a turn-on period of the switch depending on the input voltage by generating a signal for controlling the turn-off of the switch using a second coil voltage induced at the secondary coil of the inductor by input voltage or a directly sensed input voltage. Accordingly, distortion of input current can be effectively corrected.
    • 功率因数校正电路技术领域本发明涉及一种功率因数校正电路,其能够减少开关电源中的输入电流的失真。 本发明提供的功率因数校正电路基本上包括:第一电感器,其第一端电连接到输入端;第二线圈,其耦合到第一电感器以形成感应电压;开关,其电连接到 第一电感器的第二端子以及用于控制开关的导通和关断的开关控制单元。 在本发明的这样的功率因数校正电路中,开关控制单元被配置为通过使用第二开关产生用于控制开关断开的信号来根据输入电压不同地设置开关的导通周期 通过输入电压或直接感测的输入电压在电感器的次级线圈处感应线圈电压。 因此,输入电流的失真可以得到有效的纠正。