Automatic Photo Power Control System Design for RGB LED Color Temperature Research

• Main Authors: Huei-Jyun Lin, 林惠君
• Other Authors: Tai-Ping Sun
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/93212900136807893956

碩士 === 國立暨南國際大學 === 電機工程學系 === 99 === The brightness of the Light Emitting Diode is proportional to the forward current. The constant forward current of LED provides a stable brightness. Temperature is an important factor of LED optical power. The photo-power decreases with increasing temperature. Therefore, an advanced control scheme is proposed. In this paper, a scheme of Automatic Photo-Power Control system (APC) based on Automatic Electrical Power Control system (AEC) with temperature compensation is proposed. It is confirmed that optical power is stable with the range of temperature from -30℃ to 85℃ in the system. Furthermore, the discussion of color rendering index (CRI) variation under the automatic color temperature control is also verified. Key words: Automatic Electrical Power Control (AEC); Automatic Photo Power Control (APC); Color temperature control; Light Emitting Diode