Light emitting diode drive apparatus

Details Light emitting diode drive apparatus Light emitting diode drive apparatus

2007-01-16

2009-12-29

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S312000, C323S282000, C327S109000, C362S227000

Reexamination Certificate

active

07638954

ABSTRACT:
There is provided a light emitting diode drive apparatus which decreases a conducted emission. The light emitting diode drive apparatus includes a light emitting diode to which a voltage is applied from a voltage source, a choke coil connected in series to the light emitting diode, a rectifier diode connected in parallel to the light emitting diode and the choke coil to supply a back electromotive force generated in the choke coil to the light emitting diode, and a switching drive circuit including a switching element and a control circuit block. The switching element determines whether a current is applied or not applied to the light emitting diode. The control circuit block controls on/off timing of the switching element to control the current flowing into the light emitting diode. The choke coil is connected between the light emitting diode and the switching element.

REFERENCES:
patent: 5329210 (1994-07-01), Peterson et al.
patent: 5381018 (1995-01-01), Mojaradi et al.
patent: 6653798 (2003-11-01), Guthrie et al.
patent: 6870148 (2005-03-01), Dietz et al.
patent: 7115888 (2006-10-01), Hachiya et al.
patent: 2001-008443 (2001-01-01), None

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