Light emitting diode drive circuit

Details Light emitting diode drive circuit Light emitting diode drive circuit

2006-05-17

2008-10-14

Riley, Shawn (Department: 2838)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S294000, C315S307000

Reexamination Certificate

active

07436125

ABSTRACT:
Provided is an LED drive circuit capable of controlling a current caused to flow through an LED at a proper value even when a power supply voltage is higher than a sum of a forward voltage of the LED to be driven and a voltage of a current sense element. In a configuration where an inductor and a rectifying element are connected in series to each other, at each one terminal thereof and the LED and a current sense element, which are connected in series to each other, are a smoothing capacity are respectively connected to the other terminals of the inductor and the rectifying device, in parallel with each other, the LED and these elements are separated from a power supply or a ground by a switching element.

REFERENCES:
patent: 5515261 (1996-05-01), Bogdan
patent: 6466188 (2002-10-01), Cato
patent: 2005/0110469 (2005-05-01), Inaba et al.

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