Pulse width modulation apparatus and apparatus for driving...

Details Pulse width modulation apparatus and apparatus for driving... Pulse width modulation apparatus and apparatus for driving...

2007-04-17

2010-11-30

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Discharge control discharge device load

C315S224000, C315S2090SC, C315S194000, C315S291000

Reexamination Certificate

active

07843142

ABSTRACT:
Provided are a pulse width modulation (PWM) apparatus and a light source-driving apparatus including the PWM apparatus. The PWM apparatus includes a voltage division part, a capacitor part, a first operational amplifier, a first noise reduction part, and a second operational amplifier. The voltage division part divides and outputs an input voltage. The capacitor part charged by an input current or discharged for provides a charge voltage. The first operational amplifier operates according to a result of comparing a divided voltage output from the voltage division part with the charge voltage output from the capacitor part. The first noise reduction part removes a high frequency noise of the divided voltage. The second operational amplifier converts a signal generated from the capacitor part into a pulse width modulation signal by a dimming control signal.

REFERENCES:
patent: 5365150 (1994-11-01), Shiomi et al.
patent: 6486616 (2002-11-01), Liu et al.
patent: 2003/0057864 (2003-03-01), Smith
patent: 2004/0056825 (2004-03-01), Min et al.
patent: 2005/0067983 (2005-03-01), Krieger et al.
patent: 10-2002-0017358 (2002-03-01), None

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