An AC-powered, flicker-free, multi-channel LED driver with current-balancing SIMO buck topology for large area lighting applications

Kim, Hyun-Chang; Yoon, Chang Soo; Ju, Hu; Jeong, Deog‐Kyoon; Kim, Jaeha

doi:10.1109/apec.2014.6803785

Cited by 23 publications

(16 citation statements)

References 6 publications

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“…To accommodate an AC voltage input, e.g. a 110 V, 60 Hz AC mains, a DC/DC SIMO LED driver is often cascaded behind an AC/DC front-end stage [39], [40], as shown in Fig. 2, again forming a two-stage configuration, which is similar to that given in Fig.…”

Section: A Existing Ac/dc Simo Led Drivermentioning

confidence: 99%

“…Such a configuration is only useful for low-power LED applications, of which the PF requirement is less stringent [41], [42]. Also, the SIMO converter in [40] is operating in continuous conduction mode (CCM) and suffers from cross-regulation issues. Therefore, individual current regulation of LED strings is unviable, and only current sharing function is performed.…”

Section: A Existing Ac/dc Simo Led Drivermentioning

confidence: 99%

“…Therefore, individual current regulation of LED strings is unviable, and only current sharing function is performed. On the other hand, in [40], a boost PFC converter is implemented as the AC/DC front-stage converter, providing a well-regulated DC voltage and a high PF. Nevertheless, by employing a two-stage configuration, these existing AC/DC SIMO LED drivers inherently have similar demerits as those described in Fig.…”

Section: A Existing Ac/dc Simo Led Drivermentioning

confidence: 99%

“…In order to perform a power loss analysis, a non-ideal circuit simulation model, which includes the parasitic resistance, inductance and capacitance for the major components, has been created for the proposed single-stage AC/DC SIMO LED driver topology as well as the two prior arts, namely the conventional two-stage AC/DC LED driver (with three post-regulators) [14], [23]- [26] and the two-stage AC/DC SIMO LED driver [39], [40] for comparison purpose. Based on the simulation results, the total power loss and the power efficiency in each of the three topologies have been compared and tabulated in Table I.…”

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confidence: 99%

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

Guo

Lee

et al. 2016

IEEE Trans. Power Electron.

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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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Section: A Existing Ac/dc Simo Led Drivermentioning

confidence: 99%

Section: A Existing Ac/dc Simo Led Drivermentioning

confidence: 99%

Section: A Existing Ac/dc Simo Led Drivermentioning

confidence: 99%

mentioning

confidence: 99%

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

Guo

Lee

et al. 2016

IEEE Trans. Power Electron.

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“…The mainstream solution for AC-powered high-power LED drivers (V in =85~265Vac, Po>50W), two-stage LED driver configuration, generally suffers from the lower power conversion efficiency since all the power is converted twice through this cascaded configuration [1]. Compared to the twostage solution (given that the power factor requirements and the output capacitances are the same), single-stage solutions can save the energy but suffer from a low frequency current ripple.…”

Section: Introductionmentioning

confidence: 99%

A novel bipolar series Ripple compensation method for single-stage high-power LED driver

Qiu

Wang

Liu

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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It has been well documented that series compensation (SC) configuration can significantly reduce the total output capacitance of LED driver without sacrificing the power factor (PF), thus enabling the use of long-life film capacitors. Most importantly, SC provides the advantages over the parallel compensation (PC) methods in that it reduces the voltage stresses of the auxiliary stage components and thus can provide a higher efficiency, which is especially desirable for highpower LED drivers. However, with conventional series compensation, the auxiliary stage requires an auxiliary winding from the main stage. This increases the cost as well as the complexity of the circuit design. In this paper, a novel FullBridge Ripple Compensation Converter (FB RCC) using floating capacitor is proposed. By innovatively controlling the power flow of this auxiliary circuit, the auxiliary winding can be eliminated, thus making the input side of the auxiliary circuit floating and rendering a more cost effective and more flexible solution for both isolated and non-isolated LED driver applications. The new ripple compensation method retains the outstanding ripplecancellation ability and high efficiency of the original SC method, and has been demonstrated in a 100W, 150V-0.7A experimental prototype. I.978-1-4799-6735-3/15/$31.00 ©2015 IEEE

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High‐power‐factor dimmable LED driver with low‐frequency pulse‐width modulation

Cheng

Chang

Cheng

et al. 2016

IET Power Electronics

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A novel dimmable light-emitting diode (LED) driver is proposed in this study. The circuit topology uses two active switches. One active switch shared by a buck-boost converter and a buck converter is operated at highswitching frequency while the other one is low-frequency pulse-width modulated to dim high-power LEDs. The buckboost converter plays the role of a power-factor corrector. It operates at discontinuous-conduction mode to waveshape the line current to be sinusoidal and in phase with the input-line voltage. The buck converter regulates the dc-link voltage to output a low-frequency pulse-width modulation (PWM) voltage to drive high-brightness LEDs. Since only one power-conversion process is required, and the buck converter works only when the low-frequency PWM voltage is at a high level, the proposed LED driver has the advantage of high efficiency. Besides, it achieves unity power factor and low total current harmonic distortion.

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An AC-powered, flicker-free, multi-channel LED driver with current-balancing SIMO buck topology for large area lighting applications

Cited by 23 publications

References 6 publications

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

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

A novel bipolar series Ripple compensation method for single-stage high-power LED driver

High‐power‐factor dimmable LED driver with low‐frequency pulse‐width modulation

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