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High-efficiency asymmetrical half-bridge converter without electrolytic capacitor for low-output-voltage AC-DC LED drivers

dc.contributor.authorArias Pérez de Azpeitia, Manuel 
dc.contributor.authorFernández Díaz, Marcos 
dc.contributor.authorGonzález Lamar, Diego 
dc.contributor.authorBalocco, Didier
dc.contributor.authorDiallo, Almadidi
dc.contributor.authorSebastián Zúñiga, Francisco Javier
dc.identifier.citationIEEE Transactions on Power Electronics, 28(5), p. 2539-2549 (2013); doi:10.1109/TPEL.2012.2213613
dc.description.abstractDue to their high reliability and luminous efficacy, high-brightness light-emitting diodes are being widely used in lighting applications, and therefore, their power supplies are required to have also high reliability and efficiency. A very common approach for achieving this in ac-dc applications is using a two-stage topology. The power factor corrector boost converter operating in the boundary conduction mode is a very common converter used as first stage. It is normally designed without electrolytic capacitors, improving reliability but also increasing the low-frequency ripple of the output voltage. The asymmetrical half-bridge (AHB) is a perfect option for the second stage as it has very high efficiency, it operates at constant switching frequency, and its output filter is small (i.e., it can be also easily implemented without electrolytic capacitors). Moreover, the AHB is an excellent candidate for self-driven synchronous rectification (SD-SR) as its transformer does not have dead times. However, the standard configuration of the SD-SR must be modified in this case in order to deal with the transformer voltage variations due to the input voltage ripple and, more important, due to the LED dimming state. This modification is presented in this paper. Another important issue regarding the AHB is that its closed-loop controller cannot be very fast and it cannot easily cancel the previously mentioned low-frequency ripple. In this paper, a feed-forward technique, specifically designed to overcome this problem, is also presented. The experimental results obtained with a 60-W topology show that efficiency of the AHB may be very high (94.5%), while the inherent control problems related to the AHB can be overcome by the proposed feed-forward technique
dc.description.sponsorshipThis work has been supported by Spanish Government under projects RUE-10-CSD2009-00046 FEDER Funds and MICINN10-DPI2010-21110-C02-01 and by company AEG Power Solutions B.V. under project FUO-EM-002-10
dc.format.extentp. 2539-2549spa
dc.relation.ispartofIEEE Transactions on Power Electronics, 28(5)spa
dc.rightsCC Reconocimiento - No comercial - Sin obras derivadas 3.0 España
dc.rights© 2013 IEEE
dc.subjectAC–DC converterspa
dc.subjectAsymmetrical half bridgespa
dc.subjectDc–dc converterspa
dc.subjectLED driversspa
dc.titleHigh-efficiency asymmetrical half-bridge converter without electrolytic capacitor for low-output-voltage AC-DC LED drivers
dc.typejournal article
dc.rights.accessRightsopen access

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CC Reconocimiento - No comercial - Sin obras derivadas 3.0 España
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