Open AccessHighly accurate average current controller using charge sharing method for LED lamp driver
Author(s) -
Ahn H.A,
Hong S.K.,
Kwon O.K.
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.4028
Subject(s) - current (fluid) , led lamp , light emitting diode , controller (irrigation) , voltage , cmos , power (physics) , chip , diode , electrical engineering , electronic engineering , computer science , engineering , physics , agronomy , quantum mechanics , biology
An average current controller (ACC) that can accurately regulate the light‐emitting diode (LED) forward current for lighting applications is proposed. The proposed ACC employs a charge sharing method to achieve a highly accurate average LED forward current by compensating for an error occurred when the LED forward current is sampled. It was fabricated using a 0.35 μm CMOS process technology and occupied a small chip area of 1028 μm × 728 μm. The measurement results showed that the proposed ACC achieved a deviation in the average LED forward current of <0.6% over the entire input voltage range while achieving a maximum power efficiency of 93.6%. Therefore, the proposed ACC is suitable for high‐quality LED lighting systems requiring an accurate LED forward current.