ISBN 978-3-8439-5053-4

978-3-8439-5053-4, Reihe Elektronik

Lukas Lohaus
Tailored Smart Lighting Systems with Energy-Efficient Electronics

476 Seiten, Dissertation Rheinisch-Westfälische Technische Hochschule Aachen (2021), Hardcover, A5

Zusammenfassung / Abstract

Energy efficiency is the key driver for future lighting systems, while light quality becomes increasingly important, as it stimulates human body functions, emotions and perception.

This work aims to improve and tailor the quality of smart lighting systems with energy-efficient and flexibly deployable electronics. Novel control theories, circuit architectures and system concepts are proposed for the communication system, the color control algorithm and a multi-channel LED driving stage.

To enhance color quality in terms of brightness accuracy, color deviation and spectral power distribution (SPD), this work presents a six-channel color control algorithm that is realized at low hardware complexity. This color control approach offers an optimization of SPDs by selectable criteria, such as CRI, while keeping the perceivable color shift minimal. Since color precision also depends essentially on the accuracy of LED forward current, this thesis moreover develops an LED driving stage with a digital dynamic headroom control that achieves precise current regulation and high efficiency at the same time.

For communication purposes, this work investigates the power line communication technology “Digital Load-Side Transmission” (DLT). DLT system intelligence is substantially improved by introducing a fully bidirectional communication. Targeting minimum (standby) power consumption, robust receiver architectures are developed for forward and reverse channel. Additionally, efficient power supplies are realized for wall-mounted control devices to deliver enough power for enabling wireless accessibility of a DLT system.

In conclusion, this work optimizes color precision, efficiency and system intelligence at once and thereby provides improvements on both, component and system level, which are finally integrated on silicon. These optimized solutions can be tailored as needed in human centric lighting applications and thus holistically enhance the quality of smart lighting systems.