Analysis, Design, and Experimentation of a Dimmable Resonant-Switched-Capacitor LED Driver With Variable Inductor Control

This paper proposes a new 48-V dc-fed dimmable LED driver based on a resonant-switched-capacitor topology (RSCT), where the analog-based dimming feature is accomplished by means of a variable inductor (VI). The proposed topology is based on the classic RSCT step-up double mode converter and it provi...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-04, Vol.32 (4), p.3051-3062
Main Authors: Martins, Marco, Perdigao, Marina S., Mendes, Andre M. S., Pinto, Rafael A., Alonso, J. Marcos
Format: Article
Language:English
Subjects:
Capacitors
Converters
Dimming
Diodes
electromagnetic devices
Experimentation
Feasibility studies
Inductors
LED driver
LED lamps
Light emitting diodes
switched-capacitor converter (SCC)
Switches
Topology
variable inductor (VI)
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Summary:This paper proposes a new 48-V dc-fed dimmable LED driver based on a resonant-switched-capacitor topology (RSCT), where the analog-based dimming feature is accomplished by means of a variable inductor (VI). The proposed topology is based on the classic RSCT step-up double mode converter and it provides a simple and cost-effective solution while guaranteeing a wide dimming range. In order to implement an analog-based dimming, the control of the dc current in the LED lamp is required. This technique proposes to replace the resonant inductor by a VI, which will control the rms value of the resonant current, and, therefore, the mean value of the LED lamp current. In order to evaluate the feasibility and performance of this method, a 22-W LED lamp and driver prototypes were built. The most relevant experimental results are presented and briefly described.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2575918