LED driving apparatus

Details LED driving apparatus LED driving apparatus

2008-01-22

2008-01-22

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S169100, C315S224000, C315S225000, C315S119000, C315S308000, C345S082000, C345S102000

Reexamination Certificate

active

07321206

ABSTRACT:
An apparatus for driving an LED is provided. The driving apparatus may have an LED unit including at least one LED, and a current controlling unit for controlling the magnitude of current flowing through the LED unit in response to a control signal. The LED driving apparatus may include a voltage detecting unit for detecting a voltage across the LED unit and a control signal blocking unit for comparing the voltage detected by the voltage detecting unit with a reference voltage. The control signal blocking part prevents the control signal from being applied to the current controlling unit when the detected voltage is lower than the reference voltage. With this configuration, the LED driving apparatus is capable of preventing a circuit from being damaged by overcurrent by cutting off a control signal when a determined number or more of LEDs are short-circuited or otherwise not operational.

REFERENCES:
patent: 6630801 (2003-10-01), Schuurmans
patent: 2005/0231127 (2005-10-01), Yamamoto et al.
patent: 2006/0192728 (2006-08-01), Kim
patent: 2004-194452 (2004-07-01), None
patent: 2005-033853 (2005-02-01), None
patent: 2005-160178 (2005-06-01), None

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