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    • 47. 发明授权
    • Lighting device and lighting system
    • 照明设备和照明系统
    • US07157859B2
    • 2007-01-02
    • US11046880
    • 2005-02-01
    • Takao Inoue
    • Takao Inoue
    • H05B37/00H05B39/00H05B41/00
    • H05B33/0821H05B33/089
    • First resistors (R1, R2) for setting a forward current value are connected in series to light-emitting diodes (LED 1, LED 2) respectively to constitute first serial circuits (112, 113), which are connected to an input terminal (111). Second serial circuits (115, 116) are connected in parallel to the first serial circuits (112, 113) respectively. The second serial circuits (115, 116) are constituted by a combination of a Zener diode (ZD1) and a second resistor (R3), and another combination of a Zener diode (ZD2) and a second resistor (R4). When a higher voltage than rated voltages of the light-emitting diodes (LED 1, LED 2) is applied, the Zener diodes (ZD1, ZD2) shunt current into the second serial circuit (115, 116) to allow the light-emitting diodes (LED 1, LED 2) to light up at desirable luminance levels different from each other. When a supplied power voltage decreases, current is not shunted, so that the same forward current flows through the light-emitting diodes (LED 1, LED 2), allowing the light-emitting diodes (LED 1, LED 2) to go off at the same timing.
    • 用于设定正向电流值的第一电阻器(R 1,R 2)分别与发光二极管(LED 1,LED 2)串联连接以构成第一串联电路(112,113),其连接到输入端子 (111)。 第二串行电路(115,116)分别与第一串行电路(112,113)并联连接。 第二串联电路(115,116)由齐纳二极管(ZD 1)和第二电阻器(R 3)的组合构成,齐纳二极管(ZD 2)和第二电阻器(R 4)的组合, 。 当施加比发光二极管(LED 1,LED 2)的额定电压高的电压时,齐纳二极管(ZD 1,ZD 2)将电流分流到第二串联电路(115,116)中, 发光二极管(LED 1,LED 2)以相互不同的期望亮度水平亮起。 当供电电压降低时,电流不会分流,因此相同的正向电流流过发光二极管(LED 1,LED 2),允许发光二极管(LED 1,LED 2)在 相同的时机。