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    • 28. 发明申请
    • CONTROL CIRCUIT OF LIGHT-EMITTING ELEMENT
    • 发光元件的控制电路
    • US20110266965A1
    • 2011-11-03
    • US13096652
    • 2011-04-28
    • Feng XuYoshio Fujimura
    • Feng XuYoshio Fujimura
    • H05B37/02
    • H05B33/0815H05B33/0809
    • A control circuit of a light-emitting element comprises a rectifying unit (30) which full-wave rectifies an alternating current power supply, a switching element (38), a reference voltage generating unit (40) which generates a reference voltage (Vref), and a comparator (42) which receives a voltage (Srec) rectified by the rectifying unit (30), compares a comparative voltage (Vcmp) corresponding to a current flowing to an LED (102) and the reference voltage (Vref), and controls switching of the switching element (38) according to a comparison result, wherein the reference voltage generating unit (40) comprises a voltage dividing circuit having a transistor (Q1) in which a resistance value between a source and a drain is changed according to the voltage rectified by the rectifying unit (30), and outputs, using the voltage dividing circuit, the reference voltage (Vref) according to the voltage (Srec) rectified by the rectifying unit (30).
    • 发光元件的控制电路包括对交流电源进行全波整流的整流单元(30),产生参考电压(Vref)的开关元件(38),参考电压产生单元(40) 和接收由整流单元(30)整流的电压(Srec)的比较器(42),比较与流过LED(102)的电流和基准电压(Vref)对应的比较电压(Vcmp),以及 根据比较结果控制开关元件(38)的切换,其中基准电压产生单元(40)包括具有晶体管(Q1)的分压电路,其中源极和漏极之间的电阻值根据 由整流单元(30)整流的电压,并且使用分压电路根据由整流单元(30)整流的电压(Srec)输出基准电压(Vref)。