Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2008-11-07
2011-10-18
Chang, Daniel D (Department: 2819)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S312000
Reexamination Certificate
active
08040075
ABSTRACT:
Disclosed are an illumination apparatus for adjusting a color temperature and brightness, which can determine duties of pulse width modulation (PWM) control pulses for driving two light sources having different color temperatures, and an illumination system including the same. The illumination apparatus includes first and second light source units emitting light of different color temperatures, first and second pulse width modulation (PWM) driving units respectively driving the first and second light source units by a PWM control method, and a duty control unit controlling respective duties of PWM control pulses of the first and second PWM driving units according to a color-temperature set value and a brightness set value input from the outside. The duty control unit controls the duties such that the color-temperature set value is reflected in the respective duties of the PWM control pulses of the first and second PWM driving units in a complementary relation.
REFERENCES:
patent: 6788011 (2004-09-01), Mueller et al.
patent: 2008/0030153 (2008-02-01), Mizuno
patent: 2010/0148703 (2010-06-01), Mizuno
patent: 07-211463 (1995-08-01), None
patent: 08-064369 (1996-03-01), None
Japanese Office Action, w/ English translation thereof, issued in Japanese Patent Application No. JP 2008-303065 dated Jun. 14, 2011.
Chang Daniel D
McDermott Will & Emery LLP
Samsung LED Co., Ltd.
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