TY - GEN
T1 - A merged-stage high efficiency high power factor HB-LED converter without electrolytic capacitor
AU - Peretz, Mor M.
AU - Chen, Michael
AU - Goyal, Nikhil
AU - Prodic, Aleksandar
PY - 2012/12/1
Y1 - 2012/12/1
N2 - This paper introduces a merged converter topology for supplying high-brightness light-emitting diodes for lighting applications. The converter combines a boost-based power factor correction rectifier (PFC) and a resonant converter in a single-stage. In this topology both converters share the same switching components and a bulky electrolytic capacitor, existing in conventional systems, is replaced with a small film capacitor. These modifications result in a smaller volume and number of components, compared to other 2-stage topologies. The intermediate energy storage capacitor is reduced by allowing a large voltage ripple across it and storing a portion of energy in the resonant part of the converter. The converter is regulated by a digital controller implementing a variable frequency variable-duty-ratio control algorithm. Constant light output and dimming capability are obtained by varying the frequency of the resonant part. The duty ratio control is used at the front end of the converter, to obtain power factor correction. Experimental results with a 15 W prototype verify reliable operation with a small film capacitor, near unity power factor, and high efficiency, varying between 88% and 90% over the entire operating range.
AB - This paper introduces a merged converter topology for supplying high-brightness light-emitting diodes for lighting applications. The converter combines a boost-based power factor correction rectifier (PFC) and a resonant converter in a single-stage. In this topology both converters share the same switching components and a bulky electrolytic capacitor, existing in conventional systems, is replaced with a small film capacitor. These modifications result in a smaller volume and number of components, compared to other 2-stage topologies. The intermediate energy storage capacitor is reduced by allowing a large voltage ripple across it and storing a portion of energy in the resonant part of the converter. The converter is regulated by a digital controller implementing a variable frequency variable-duty-ratio control algorithm. Constant light output and dimming capability are obtained by varying the frequency of the resonant part. The duty ratio control is used at the front end of the converter, to obtain power factor correction. Experimental results with a 15 W prototype verify reliable operation with a small film capacitor, near unity power factor, and high efficiency, varying between 88% and 90% over the entire operating range.
UR - http://www.scopus.com/inward/record.url?scp=84874173644&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84874173644
SN - 9783800734313
T3 - PCIM Europe Conference Proceedings
SP - 357
EP - 364
BT - Proceedings - PCIM Europe 2012
T2 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Europe 2012
Y2 - 8 May 2012 through 10 May 2012
ER -
