A flicker-free electrolytic capacitor-less ac-dc LED driver

Wang, Hong; Ruan,; Yao, Xin; Ye, Jianhuai

doi:10.1109/ecce.2011.6064076

Cited by 61 publications

(50 citation statements)

References 16 publications

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“…Although all of them can decouple the dc-link ripple power, film capacitors are always preferred for ripple energy storage because of their much lower equivalent series resistance (ESR) and higher power density as compared to inductors. Some more three-phase based singlephase power decoupling circuits can be found in [13][14][15][16][17] and the basic operating principle is the same.…”

Section: Introductionmentioning

confidence: 99%

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DQ reference frame modeling and control of single-phase active power decoupling circuits

Tang

Qin

Blaabjerg

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Power decoupling circuits can compensate the inherent double line frequency ripple power in single-phase systems and greatly facilitate their dc-link capacitor design. Example applications of power decoupling circuit include photovoltaic, light-emitting diode, fuel cell, and motor drive systems. This paper presents the dq synchronous reference frame modeling of single-phase power decoupling circuits and a complete model describing the dynamics of dc-link ripple voltage is presented. The proposed model is universal and valid for both inductive and capacitive decoupling circuits, and the input of decoupling circuits can be either dependent or independent of its front-end converters. Based on this model, a dq synchronous reference frame controller is designed which allows the decoupling circuit to operate in two different modes because of the circuit symmetry. Simulation and experimental results are presented to verify the effectiveness of the proposed modeling and control method.

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Section: Introductionmentioning

confidence: 99%

“…Unfortunately, E-caps are also known to be very vulnerable under high temperature operation, and they may bring design difficulties if long lifetime is desired for the power converter, e.g. in PV and light-emitting diode (LED) applications [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

DQ reference frame modeling and control of single-phase active power decoupling circuits

Tang

Qin

Blaabjerg

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

show abstract

“…This method reduces the required output capacitance at the cost of the power factor, because the sinusoidal input current shape is distorted by the current injection. A parallel compensation method [7][8][9] can achieve both high Power Factor (PF) and tight current regulation by adding an auxiliary power stage in parallel with the power factor correction (PFC) stage's output port to compensate the output current ripple, as shown in Fig. 1(a).…”

Section: Introductionmentioning

confidence: 99%

“…To maintain a high power density, electrolytic capacitors are necessary, which significantly reduce the life span of the entire LED bulb [4]. Several electrolytic-capacitor-less solutions have been proposed for single-stage LED drivers to replace the electrolytic capacitors with film capacitors [5] or ceramic capacitors [6][7][8][9][10][11][12], but they all have drawbacks.…”

Section: Introductionmentioning

confidence: 99%

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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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A single‐stage integrated bridgeless AC/DC converter for electrolytic capacitor‐less LED lighting applications

Zheng

et al. 2014

Circuit Theory & Apps

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SUMMARYIn this paper, a single-stage integrated bridgeless AC/DC converter is proposed. As compared to its counterpart that is composed of totem-pole boost power factor correction (PFC) cascade fly-back DC/DC converter, the studied circuit has less components number while overcoming the limits of the totem-pole type. Thus, it is suitable to the low-power LED lighting applications. Furthermore, when both PFC inductors L b and magmatic inductance L m of the transformer TR1 operate at discontinuous current mode, the bus voltage v CB can be used to decouple the ac input and constant dc output power. Thus, the approach of increasing bus voltage ripple is employed to eliminate electrolytic capacitors and obtain long operation lifetime. Additionally, it is able to be compatible with our studied twin-bus configuration for increasing the overall efficiency. A 50-W hardware prototype has been designed, fabricated, and tested in the laboratory to verify the proposed converter validity.

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A flicker-free electrolytic capacitor-less ac-dc LED driver

Cited by 61 publications

References 16 publications

DQ reference frame modeling and control of single-phase active power decoupling circuits

DQ reference frame modeling and control of single-phase active power decoupling circuits

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

A single‐stage integrated bridgeless AC/DC converter for electrolytic capacitor‐less LED lighting applications

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