High power factor primary regulated offline led driver
    182.
    发明专利
    High power factor primary regulated offline led driver 审中-公开
    高功率因数主要调节离线LED驱动器

    公开(公告)号:JP2014116307A

    公开(公告)日:2014-06-26

    申请号:JP2013249831

    申请日:2013-12-03

    Inventor: THOMAS STAMM

    Abstract: PROBLEM TO BE SOLVED: To provide an improved LED drive circuit and method for illumination.SOLUTION: A fly-back type switched current regulator includes a primary transformer winding coupled to receive a rectified DC signal derived from an AC signal. A drain of a power transistor is coupled to the primary winding, and a source of the power transistor is coupled to an input of a comparison circuit and a primary transformer winding sense resistor. A control terminal of the power transistor is coupled to an output of the comparison circuit. A capacitor stores a variable reference signal for application at a first capacitor terminal to another input of the differential circuit. The variable reference signal is compared with a winding current signal generated by the sense resistor by the comparison circuit. An injection circuit applies an AC signal derived from the rectified DC signal to a second terminal of the capacitor so as to modulate the stored variable reference signal. The regulator is coupled to drive LEDs.

    Abstract translation: 要解决的问题:提供改进的LED驱动电路和照明方法。解决方案:回扫式开关电流调节器包括耦合以接收从AC信号导出的整流DC信号的初级变压器绕组。 功率晶体管的漏极耦合到初级绕组,并且功率晶体管的源极耦合到比较电路和初级变压器绕组检测电阻器的输入端。 功率晶体管的控制端耦合到比较电路的输出端。 电容器存储用于在第一电容器端子处施加到差分电路的另一输入端的可变参考信号。 可变参考信号与由比较电路由检测电阻器产生的绕组电流信号进行比较。 注入电路将从整流后的直流信号得到的交流信号施加到电容器的第二端,以便调制存储的可变参考信号。 调节器耦合到驱动LED。

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