Lighting device and lighting system

Details Lighting device and lighting system Lighting device and lighting system

2007-01-02

2007-01-02

Wong, Don (Department: 2163)

Electric lamp and discharge devices: systems

Plural series connected load devices

Christmas lights

C315S122000, C315S123000

Reexamination Certificate

active

11046880

ABSTRACT:
First resistors (R1, R2) for setting a forward current value are connected in series to light-emitting diodes (LED1, LED2) 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 (LED1, LED2) is applied, the Zener diodes (ZD1, ZD2) shunt current into the second serial circuit (115, 116) to allow the light-emitting diodes (LED1, LED2) 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 (LED1, LED2), allowing the light-emitting diodes (LED1, LED2) to go off at the same timing.

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