Title:
パルス幅変調装置及びこれを備えた光源駆動装置
Document Type and Number:
Japanese Patent JP4991844
Kind Code:
B2
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.
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Inventors:
Kim, tex
Kim, Hyunsik
Kim, Hyunsik
Application Number:
JP2009506410A
Publication Date:
August 01, 2012
Filing Date:
April 17, 2007
Export Citation:
Assignee:
LG Innotek Co., Ltd
International Classes:
H03K7/08; H02M7/48
Domestic Patent References:
| JP2005019375A |
Attorney, Agent or Firm:
Sakaki Morishita