LED illumination system with a power saving feature
    1.
    发明授权
    LED illumination system with a power saving feature 失效
    LED照明系统具有省电功能

    公开(公告)号:US08242713B2

    公开(公告)日:2012-08-14

    申请号:US12719002

    申请日:2010-03-07

    IPC分类号: G05F1/00

    CPC分类号: H05B33/0812 Y02B20/345

    摘要: An LED illumination system includes a control circuit having a timing unit, a control unit, a PWM signal generating unit and a micro-programmed control unit (MCU). The timing unit divides an operating period of an LED lamp into different time segments, and outputs clock signals. The control unit outputs different controlling signals corresponding to the clock signals to the PWM signal generating unit, which in turn generates different PWM signals with different duty cycles. A constant current circuit electrically connects the control circuit and outputs different electric currents to make the LED lamp emit light having different light intensities at the different time segments. The MCU is at an outside of the LED lamp and sets a program to control the timing unit, the control unit and the PWM signal generating unit.

    摘要翻译: LED照明系统包括具有定时单元,控制单元,PWM信号生成单元和微编程控制单元(MCU)的控制电路。 定时单元将LED灯的工作周期分为不同的时间段,并输出时钟信号。 控制单元将对应于时钟信号的不同控制信号输出到PWM信号产生单元,该信号又产生具有不同占空比的不同PWM信号。 恒流电路将控制电路电连接并输出不同的电流,使得LED灯在不同的时间段发光,具有不同的光强度。 MCU位于LED灯的外部,并设置一个程序来控制定时单元,控制单元和PWM信号产生单元。

    Light emitting diode lamp protecting circuit
    2.
    发明授权
    Light emitting diode lamp protecting circuit 失效
    发光二极管灯保护电路

    公开(公告)号:US08115396B2

    公开(公告)日:2012-02-14

    申请号:US12558603

    申请日:2009-09-14

    IPC分类号: H05B37/00 H05B41/00

    CPC分类号: H05B33/089 Y02B20/341

    摘要: An LED lamp protecting circuit includes an LED lamp, a constant current source and a buffer circuit. The constant current source includes positive and negative input terminals, positive and negative output terminals and a switch. The buffer circuit is connected between the negative output terminal and the LED lamp. The buffer circuit includes a charging capacitor, a first NPN transistor and a second PNP transistor. An emitting electrode of the second transistor is connected to the LED lamp. A collecting electrode of the second transistor is connected to the negative output terminal. The charging capacitor is connected between the emitting electrode of the second transistor and a ground. A collecting electrode and an emitting electrode of the first transistor are respectively electrically connected to a base electrode of the second transistor and the ground.

    摘要翻译: LED灯保护电路包括LED灯,恒流源和缓冲电路。 恒流源包括正负输入端子,正负输出端子和开关。 缓冲电路连接在负输出端子和LED灯之间。 缓冲电路包括充电电容器,第一NPN晶体管和第二PNP晶体管。 第二晶体管的发射电极连接到LED灯。 第二晶体管的集电极连接到负输出端子。 充电电容器连接在第二晶体管的发射电极和地之间。 第一晶体管的集电极和发射电极分别电连接到第二晶体管的基极和地。

    LED illumination system with a power saving feature
    3.
    发明授权
    LED illumination system with a power saving feature 失效
    LED照明系统具有省电功能

    公开(公告)号:US08362714B2

    公开(公告)日:2013-01-29

    申请号:US12696000

    申请日:2010-01-28

    IPC分类号: H05B37/02 G05F1/00

    摘要: An LED illumination system includes a control circuit having a timing unit, a control unit and a PWM signal generating unit. The timing unit divides an operating period of an LED lamp into a plurality of time segments, and outputs a clock signal at a start of each time segment to the control unit. The control unit outputs different controlling signals corresponding to the clock signals to the PWM signal generating unit, which in turn generates different PWM signals with different duty cycles. A constant current circuit electrically connects the control circuit to the LED lamp. The constant current circuit outputs different electric currents to the LED lamp according to the PWM signals, to thereby control the LED lamp to emit light having different light intensities at the various time segments of the operating period.

    摘要翻译: LED照明系统包括具有定时单元,控制单元和PWM信号生成单元的控制电路。 定时单元将LED灯的工作周期划分为多个时间段,并将每个时间段开始处的时钟信号输出到控制单元。 控制单元将对应于时钟信号的不同控制信号输出到PWM信号产生单元,该信号又产生具有不同占空比的不同PWM信号。 恒流电路将控制电路电连接到LED灯。 恒流电路根据PWM信号向LED灯输出不同的电流,从而控制LED灯在工作周期的各个时间段发射具有不同光强度的光。