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Open AccessArticle

Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp

CE3I2 Group, Department of Electrical Engineering, University of Oviedo, 33204 Gijon, Spain
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Electronics 2019, 8(7), 798; https://doi.org/10.3390/electronics8070798
Received: 25 June 2019 / Revised: 12 July 2019 / Accepted: 15 July 2019 / Published: 16 July 2019
(This article belongs to the Special Issue Latest Developments in LED Drivers)
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Abstract

The strict restrictions imposed both by mandatory regulations and by the recommendations contained in current standards have led to the fact that most commercially available LED ballasts nowadays use two-stage topologies. The first stage is intended to comply with the harmonics standards and the second stage is used to control the LED current and reduce the low frequency ripple. In this work, a new DC–DC resonant converter topology is presented. This topology is derived from a modified Class-E resonant inverter by adding a clamping diode. This diode achieves a double goal: it limits the maximum switch voltage and works as a power recirculating path. This way, the proposed topology behaves as a loss-less impedance placed in series with the LED thus allowing to control the output power. This converter maintains the extremely small switching losses inherent to the Class-E inverter while reducing the voltage stress across the switch. This work presents a simplified design methodology based on the fundamental approach. This methodology was used to design and build a DC–DC post-regulator for a 40 W LED lamp. The results obtained with the laboratory prototype show that this circuit can be used to stabilize and dim the LED current while maintaining very small losses. The measured efficiency was 95.7% at nominal power and above 90% when dimmed down to 25%. View Full-Text
Keywords: LED driver; high efficiency LEDs; solid state lighting; resonant DC–DC converter; Class-E inverter; single-switch topology; voltage clamp LED driver; high efficiency LEDs; solid state lighting; resonant DC–DC converter; Class-E inverter; single-switch topology; voltage clamp
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ribas, J.; Quintana, P.J.; Cardesin, J.; Calleja, A.J.; Lopez-Corominas, E. Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp. Electronics 2019, 8, 798.

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