LED lighting apparatus

Details LED lighting apparatus LED lighting apparatus

2007-05-10

2010-02-23

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S219000, C315S224000, C315S308000

Reexamination Certificate

active

07667414

ABSTRACT:
An LED lighting apparatus can be configured to supply a number of LEDs connected in series with a requisite voltage and power even if an amount of forward voltage of the LEDs connected in series is larger than a supply voltage of a battery. The LED lighting apparatus can include a boosting circuit and an inverted boosting circuit. LEDs can be connected between outputs of the boosting circuit and the inverted boosting circuit. The LED lighting apparatus can also include a current detection circuit configured to detect an LED current, and can include a dual PWM control IC configured to control the boosting circuit and the inverted boosting circuit in accordance with the LED current detected by the current detection circuit so as to keep the LED current substantially constant. The LED lighting apparatus can include a shutdown circuit to stop supplying a power supply when a load that includes the LEDs is in a circuit that is either opened or shorted.

REFERENCES:
patent: 2005/0093792 (2005-05-01), Yamamoto et al.
patent: 2007/0267984 (2007-11-01), Peng
patent: 2005136157 (2005-05-01), None

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