Circuit arrangement

Details Circuit arrangement Circuit arrangement

2005-08-16

2005-08-16

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Plural series connected load devices

Combined with parallel connected load device

C315S307000, C315S308000

Reexamination Certificate

active

06930452

ABSTRACT:
In a circuit arrangement for driving a LED array comprising red, green and blue LEDs, a control loop is added for limiting the duty cycles of the control signals for driving the red, green and blue LEDs. In case one of the duty cycles reaches the limit value, the reference signals for the red, green and blue light are decreased with the same relative amount. The color point of the light is thereby maintained, even when the efficiency of part of the LEDs decreases.

REFERENCES:
patent: 4675575 (1987-06-01), Smith et al.
patent: 6362578 (2002-03-01), Swanson et al.

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