In order to reduce the EMI emission one can either improve the
design of the switching LED driving circuit (e.g. Wang and Xu, 2012),
or use a LED driving circuit that doesn’t output pulsed current. A
recent commercial solution is the provided by IST (Integrated System
Technologies Limited, Aldridge, UK) with its iDrive Quad LED
driver that according to the specifications provides DC current output
without switching with a 16-bit dynamic range. The IST iDrive
Quad, however, is not directly compatible with our PWM-based
solution as it can be only driven with constant voltage (1–10 V)
or network lighting control protocols Digital Addressable Lighting
Interface (DALI, http://www.dali-ag.org/) and DMX512/RDM (e.g.
http://www.opendmx.net/) mainly used in architectural lighting
control. Additionally, the dynamic range of the system could be
increased by adding a switching transistor like insulated gate bipolar
transistor (IGBT) to the output of the iDrive Quad or similar
constant current supply, and switch the output current driving the
transistor with the PWM output of Arduino.
In order to reduce the EMI emission one can either improve thedesign of the switching LED driving circuit (e.g. Wang and Xu, 2012),or use a LED driving circuit that doesn’t output pulsed current. Arecent commercial solution is the provided by IST (Integrated SystemTechnologies Limited, Aldridge, UK) with its iDrive Quad LEDdriver that according to the specifications provides DC current outputwithout switching with a 16-bit dynamic range. The IST iDriveQuad, however, is not directly compatible with our PWM-basedsolution as it can be only driven with constant voltage (1–10 V)or network lighting control protocols Digital Addressable LightingInterface (DALI, http://www.dali-ag.org/) and DMX512/RDM (e.g.http://www.opendmx.net/) mainly used in architectural lightingcontrol. Additionally, the dynamic range of the system could beincreased by adding a switching transistor like insulated gate bipolartransistor (IGBT) to the output of the iDrive Quad or similarconstant current supply, and switch the output current driving thetransistor with the PWM output of Arduino.
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