An Overview of the AC-DC and DC-DC Converters for LED Lighting Applications

摘要

Svjetle?e diode s visokom razinom svjet-line (HB-LED) smatraju se budu?im trendom u rasvjeti zahvaljuju?i ne samo visokom stupnju efikasnosti i pouzdanosti, nego i njihovim izvanrednim svojstvima: raznolikost boja, otpornost na udarce i vibracije i si. Ipak, s ciljem potpunog iskori?tenja prethodno spomenutih svojstava, potrebno je razviti nove, posebno osmi?ljene izvore napajanja. Osim toga, pona?anje im se posve razlikuje od ostalih tipova rasvjete ?to je potrebno uzeti u obzir pri projektiranju pretvara?a za njihovo napajanje. Kao posljedica toga, mnoge su poznate topologije pretvara?a opti-mirane ili preoblikovane posebno za primjenu u LED rasvjeti, a zadnjih nekoliko godina mnoge nove su se tek pojavile.rnU ovom ?lanku obja?njena su osnovna HB-LED svojstva nagla?avaju?i njihov utjecaj na razvoj izvora napajanja. Uz to, prikazane su osnovne topologije, od najjednostavnijih do najslo?enijih, ujedno analiziraju?i prednosti i nedostatke pojedinih.%High-Brightness Light Emitting Diodes (HB-LEDs) are considered the future trend in lighting not only due to their high efficiency and high reliability, but also due to their other outstanding characteristics: chromatic variety, shock and vibration resistance, etc. Nevertheless, they need the development of new power supplies especially designed for boosting and taking advantage of their aforementioned characteristics. Besides, their behaviour is completely different from the rest of lighting devices and, consequently, it should be also taken into account in the design of the converters used to drive them. As a result, many well-known topologies have been optimized or redesigned in order to be used in LED-lighting applications and many new topologies have come up in the recent years with the same purpose. In this paper, the main HB-LED characteristics will be explained, highlighting how they influence the design of their power supplies. After, the main topologies will be presented from the simplest to the most complex ones, analysing their advantages and disadvantages.