A Novel Single-Stage High-Power-Factor AC-to-DC LED Driving Circuit With Leakage Inductance Energy Recycling

Abstract-Various AC/DC LED driver topologies have been proposed to meet the challenges of achieving a compact, efficient, low-cost and robust multi-string LED lighting system. These LED drivers typically employ a two-stage topology to realize the functions of AC/DC rectification and independent current control of each LED string. The choice of having two stage conversions involves additional hardware components and a more complicated controller design process. Such two-stage topologies suffer from a higher system cost, increased power loss, and large form factor. In this paper, a single-stage AC/DC single-inductor multiple-output (SIMO) LED driver is proposed. It uses only one single inductor and N+1 active power switches (N being the number of LED strings) with reduced component count and smaller form factor. The proposed driver can achieve both functions of AC/DC rectification with a high power factor and precise independent current control of each individual LED string simultaneously. A prototype of an AC/DC single-inductor triple-output (SITO) LED driver is constructed for verification. Experimental results corroborate that precise and independent current regulation of each individual LED string is achievable with the proposed driver. A power factor of above 0.99 and a peak efficiency of 89% at 30 W rated output power are attainable.

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“…Fi LEDi P WV I = (13) where V Fi is the forward voltage of LED in the i th string. From (11) and (12), the duty cycle d i can be represented by …”

Section: Ledimentioning

confidence: 99%

Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

Guo

Lee

et al. 2016

IEEE Trans. Power Electron.

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“…If galvanic isolation is achieved in the first stage, flyback family converters [45,46] are the most suitable option. Common isolated second stages are HB LLC resonant converter [51][52][53][54], Asymmetrical HB (AHB) [55,56], flyback family [50,57,58], etc. Non-isolated topologies for the second stage are buck [59], TIBuck [60][61][62][63][64][65] (taking advantage of the possibility of two isolated outputs in the first stage) or any other non-isolated topology.…”

Section: Two-stage Switching Topologiesmentioning

confidence: 99%

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

2012

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Original scientific paperHigh-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. Key words: AC-DC converters, DC-DC converters, LED, LightingPregled AC-DC i DC-DC pretvarača za primjene u LED rasvjeti. Svjetleće diode s visokom razinom svjetline (HB-LED) smatraju se budućim trendom u rasvjeti zahvaljujući ne samo visokom stupnju efikasnosti i pouzdanosti, nego i njihovim izvanrednim svojstvima: raznolikost boja, otpornost na udarce i vibracije i sl. Ipak, s ciljem potpunog iskorištenja prethodno spomenutih svojstava, potrebno je razviti nove, posebno osmišljene izvore napajanja. Osim toga, ponašanje im se posve razlikuje od ostalih tipova rasvjete što je potrebno uzeti u obzir pri projektiranju pretvarača za njihovo napajanje. Kao posljedica toga, mnoge su poznate topologije pretvarača optimirane ili preoblikovane posebno za primjenu u LED rasvjeti, a zadnjih nekoliko godina mnoge nove su se tek pojavile.U ovomčlanku objašnjena su osnovna HB-LED svojstva naglašavajući njihov utjecaj na razvoj izvora napajanja. Uz to, prikazane su osnovne topologije, od najjednostavnijih do najsloženijih, ujedno analizirajući prednosti i nedostatke pojedinih.

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“…The two-stage LED drivers require two converters, one for PFC operation and other one to provide regulated DC output voltage. The main drawback of two-stage PFC circuit is less efficiency, complex control and high cost [4,5,6]. A single-stage active PFC circuits using one switch and one control loop leads to compact size and high efficiency as compared with two-stage solution.…”

Section: Introductionmentioning

confidence: 99%

Improved efficiency coupled inductor-buck AC-DC light emitting diode (LED) driver

Narasimharaju

2016

IEICE Electron. Express

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This work proposes coupled inductor-buck (CI-B) power factor correction (PFC) LED driver. As compared with conventional buck converters, the proposed CI-B PFC converter has several advantages such as; high step-down conversion, reduced total harmonic distortion (THD), increased efficiency, achieves high power factor (PF), reduced current/voltage stress of switch/diode, and effective switch utilization factor. The proposed converter is designed to operate in discontinuous current mode (DCM) to achieve high power factor (PF) and low THD to comply IEC 61000-3-2 class C standards. In addition, a simple one-loop voltage mode controller (VMC) is implemented to achieve the desired regulated output voltage. A proto-type of 16 Watt converter is built and experimental validations are presented.

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A Novel Single-Stage High-Power-Factor AC-to-DC LED Driving Circuit With Leakage Inductance Energy Recycling

Cited by 180 publications

References 34 publications

Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

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

Improved efficiency coupled inductor-buck AC-DC light emitting diode (LED) driver

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