System and method for controlling luminance of an LED lamp

Details System and method for controlling luminance of an LED lamp System and method for controlling luminance of an LED lamp

2007-07-03

2007-07-03

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S129000, C315S360000, C116S201000

Reexamination Certificate

active

11177632

ABSTRACT:
A system for controlling luminance of an LED (Light Emitting Diode) lamp includes an MCU (3), an LED circuit (4), an LED lamp (5), and a display (6). The MCU controls the LED circuit to adjust a luminance value of the LED lamp. The MCU includes: a CPU (31) for monitoring a status of the associated display, generating a corresponding PWM (Pulse-Width Modulation) pulse when the system operates in different working phases, and transmitting the corresponding PWM pulse to the LED circuit via a PWM pin (32); a timer (33) for recording a duration of a user operating a control button (61); and a memory (34) for storing control programs. The LED circuit sets a luminance value of the LED lamp according to the PWM pulses. A related method is also provided.

REFERENCES:
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patent: 6472946 (2002-10-01), Takagi
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patent: 2002/0178388 (2002-11-01), Huppi et al.
patent: 2004/0046720 (2004-03-01), Nagai et al.
patent: 2004/0196151 (2004-10-01), Smith
patent: 2005/0007035 (2005-01-01), Sloan et al.
patent: 2005/0122060 (2005-06-01), Yu et al.

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