Title:
Dimming DC–DC LED Drivers: Power Losses, Luminous Efficiency & Best-in-Class
Dimming DC–DC LED Drivers: Power Losses, Luminous Efficiency & Best-in-Class
Author(s)
Gupta, Vasu
Advisor(s)
Rincón-Mora, Gabriel A.
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Abstract
The aim of this research is to analyze, model, and compare dimming techniques for switched-inductor (SL) light-emitting-diode (LED) drivers. LEDs have become pervasive in modern lighting and automotive applications. LED drivers regulate the LED current that sets their luminous output, where dimming is an important attribute. Dimming techniques fall in one of two categories: "analog" or "duty-cycled" (pulse-width-modulated), and duty-cycled (PWM) dimming decompose into two further classes: series- or shut-switched. A comprehensive analysis of dimming techniques, corresponding power losses, and their dimming capabilities for dc-dc applications is lacking in the literature. This research aims to explain and quantify these important parameters, like luminous flux, dimming range, and luminous efficiency. This research reveals and verifies that analog dimming is the most efficient with the widest dimming range.
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Date Issued
2021-12-14
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Text
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Thesis