Electrolytic-capacitor-less high-power LED driver

Qiu, Yue; Wang, Hongliang; Hu, Zhiyuan; Wang, Laili; Liu, Yanfei; Sen, P.C.

doi:10.1109/ecce.2014.6953892

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…To address this problem, a dual-output PFC converter can be used and C B2 can be connected to the second output of the PFC converter as in Fig. 24, T5(d) [157], [163], [164]. In this way, no inverter is needed and the series-connected auxiliary circuit can be realized by a simple dc-dc converter as C B2 can provide some active power, and the auxiliary circuit output voltage can have a small dc value.…”

Section: ) Type 5 -Ac-supplied Auxiliary-power-decoupling-circuit-bas...mentioning

confidence: 99%

LED Systems Applications and LED Driver Topologies: A Review

et al. 2023

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High-power light-emitting diodes (LEDs) and high-brightness LEDs have revolutionized the lighting industry. The availability of cost-effective LEDs with high luminous flux, efficacy, and reliability has expanded their application to replace incandescent and fluorescent light sources. They have also enabled many new applications that were considered infeasible before, due to the inherent limitations of traditional sources of light. This survey provides a comprehensive overview of ac-and dc-supplied LED lighting systems and their applications, corresponding specifications and their similarities to/differences from regular power supplies. Restrictions imposed by LEDs characteristics, safety considerations, and dimmers are discussed. Also, LED driving approaches are categorized and their suitability for different applications is provided.

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Section: ) Type 5 -Ac-supplied Auxiliary-power-decoupling-circuit-bas...mentioning

confidence: 99%

LED Systems Applications and LED Driver Topologies: A Review

et al. 2023

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“…However, the room for capacitance reduction is still limited since the ripple compensation circuit is unipolar. In [12], a bipolar series compensation method is proposed to double the capacitance reduction ability (assume using the same type of switches) as the switches stress in the proposed method is reduced by half as compared to the unipolar one. However, the extra winding from the main stage as well as the diode (D aux ) not only increases the complexity of the circuit but also bring the extra loss.…”

Section: Introductionmentioning

confidence: 99%

“…V LED =60~150V). With the existing compensation technologies proposed in [10][11][12], given the auxiliary winding turn ratio is fixed, the component voltage rating has to be overdesigned under the low output voltage operation (e.g. V LED <150V) to fit the voltage stress at the highest output voltage operation (e.g.…”

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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“…architecture based on a string of LEDs with multiple channels is often used as shown in Fig. 1(a) [6]- [10].…”

Section: Introductionmentioning

confidence: 99%

Active-Matrix Pixelated-LED Control System for Automotive Headlamps

et al. 2022

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This paper presents a driving circuitry system for high-resolution, pixelated-LED automotive headlamps. The system consists of an array of pixel drivers, and a row/column driver suitable for an active-matrix array configuration with the individual dimming control capabilities on each pixelated-LED. An asynchronous serial communication protocol is introduced to minimize the number of data transmission interface signals between the row/column driver and pixel drivers. The proposed pixel driver is designed to drive each pixelated-LED with constant current and pulse width modulation (PWM). It contains a memory cell for dimming data, and a sample-and-hold driver stage to minimize the static power consumption of the pixel driver. The proposed system has been fabricated by using a 0.18-µm CMOS process. The test chip includes a 2 × 16 pixel array with an embedded row/column driver. The functional operation has been verified with an 8 × 16 LED array system prototype.INDEX TERMS Active-matrix, pixelated-LED control, automotive headlamps, advanced driver assistance system (ADAS), high-resolution, pulse width modulation (PWM).

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Electrolytic-capacitor-less high-power LED driver

Cited by 10 publications

References 22 publications

LED Systems Applications and LED Driver Topologies: A Review

LED Systems Applications and LED Driver Topologies: A Review

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

Active-Matrix Pixelated-LED Control System for Automotive Headlamps

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