DRIVING CIRCUIT OF LIGHT-EMITTING DIODE, LIGHT-EMITTING DEVICE USING THE SAME, AND LIGHTING DEVICE

DRIVING CIRCUIT OF LIGHT-EMITTING DIODE, LIGHT-EMITTING DEVICE USING THE SAME, AND LIGHTING DEVICE

PROBLEM TO BE SOLVED: To provide a technique which stably drive an LED in a wide voltage range. SOLUTION: A driving circuit 100 drives an LED array 2 including a plurality of LEDs 4 connected in series. A power source 30 supplies a DC driving voltage Vdrv to the plurality of LEDs 4. A first constant...

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Bibliographische Detailangaben
1. Verfasser: SAKAMOTO YASUMASA
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a technique which stably drive an LED in a wide voltage range. SOLUTION: A driving circuit 100 drives an LED array 2 including a plurality of LEDs 4 connected in series. A power source 30 supplies a DC driving voltage Vdrv to the plurality of LEDs 4. A first constant current circuit 10 is provided on a driving path of the plurality of LEDs 4 to stabilize a driving current Idrv flowing in the LEDs 4. A bypass switch SW1 is provided in parallel with at least one LED4_n of the plurality of LEDs 4. A control part 20 controls turning-on/off of the bypass switch SW1. COPYRIGHT: (C)2010,JPO&INPIT