Forward Conduction Mode Controlled Piezoelectric Transformer-Based PFC LED Drive

Light-emitting diode (LED) illumination is getting more and more common; as LED's performance is rising, the price is falling and is getting competitive. Some of the challenges of ac mains supplied illumination are the requirement of power factor correction (PFC) and the competitiveness of a lo...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2013-10, Vol.28 (10), p.4841-4849
Main Authors: Roedgaard, M. S., Weirich, M., Andersen, M. A. E.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit properties
Control systems
Electric power
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Forward conduction mode (FCD) control
Light emitting diodes
light-emitting diode (LED)
Optoelectronic devices
piezoelectric transformer (PT)
Power electronics, power supplies
power factor correction (PFC)
Power generation
Resonant frequency
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Switching
Topology
Transformers
Transformers and inductors
Zero voltage switching
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Summary:Light-emitting diode (LED) illumination is getting more and more common; as LED's performance is rising, the price is falling and is getting competitive. Some of the challenges of ac mains supplied illumination are the requirement of power factor correction (PFC) and the competitiveness of a low priced market. In this paper, a new forward conduction mode (FCM) control method for piezoelectric transformer (PT)-based power converters is proposed. A PT-based LED drive facilitating passive PFC is developed, utilizing and validating the FCM control method. The drive utilizes an inductorless half-bridge topology and for circuit minimization and simplicity it has no load regulation and has a 100-Hz output modulation. The proposed FCM control method ensures that the PT is operated at its optimal operation frequency, which ensures soft-switching operation and a constant gain. As a result a 6.5-W PT-based PFC LED drive has been developed, supplied from 230-V 50-Hz ac mains, achieving a power factor of 0.96.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2012.2233499