Open AccessMultichannel sequential display LED driver with optimal transient performance and efficiency via synchronous integral control
Author(s) -
Wang Haifeng,
Hu Tingshu
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2020.0128
Subject(s) - transient (computer programming) , integrator , waveform , control theory (sociology) , channel (broadcasting) , transient response , computer science , pulse width modulation , electronic engineering , topology (electrical circuits) , voltage , light emitting diode , engineering , control (management) , electrical engineering , telecommunications , artificial intelligence , operating system
This study proposes a high performance multichannel sequential display light emitting diode (LED) driver with pulse width modulated dimming control. A synchronous integral control strategy is developed for achieving optimal transient performances for the channel voltages and ideal rectangular waveforms for the LED current, which will help to maintain high efficiency and extend the lifetime of the LEDs. By synchronous integral control, each channel has a corresponding integrator whose input and output are turned on and off synchronously with the LED string. The proposed driver topology and control strategy are supported by detailed analysis on stability and transient response during on‐time interval of a channel by using the averaged state‐space model. The effectiveness of the design method is demonstrated with simulation. A three‐channel LED driver is constructed to experimentally validate the high efficiency and high performance of the proposed topology and control strategy with desired LED current waveform and nearly constant channel voltages.