Light emitting diode driving device and light system

Details Light emitting diode driving device and light system Light emitting diode driving device and light system

2009-02-25

2011-10-25

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S287000, C315S307000, C315S360000

Reexamination Certificate

active

08044603

ABSTRACT:
A light emitting diode driving device and light system are provided. The light emitting diode driving device drives a light source by a received alternating current voltage. The light emitting diode driving device includes a rectifier, a feedback unit, a protection unit, a switch unit, a timing unit, and a control unit. The rectifier is electrically coupled to an alternating current voltage source and the light source for providing the alternating current voltage to the light source. The feedback unit is used to detect a loading state and generate a feedback signal according the loading state for outputting the feedback signal. The protection unit is used to receive the feedback signal and compare the feedback signal with a reference voltage built in the protection unit for outputting a switch signal. The switch unit is used to receive the switch signal and connect or disconnect the alternating current voltage source and the light source. Therefore, the protection unit can avoid a burnout due to an exceeding current of the light source.

REFERENCES:
patent: 6940733 (2005-09-01), Schie et al.
patent: 7863833 (2011-01-01), Tamegai et al.
patent: 2008/0074058 (2008-03-01), Lee et al.
patent: 2010/0026208 (2010-02-01), Shteynberg et al.

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