Capacitor clamped current sharing circuit for multistring LEDs

Yu, Yijie; Zhang, Fanghua; Ni, Jianjun

doi:10.1109/ecce.2012.6342313

Cited by 13 publications

(19 citation statements)

References 11 publications

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“…6 shows the TL431 biasing circuit of the dual inputvoltage-level LED driver, where R 2 is the equivalent input resistor of TL431. The output voltage v A of this TL431 biasing circuit can be derived, as shown in (9). Referring to (9), the steady-state DC value of v A is only determined by resistors R 1 and R 2 .…”

Section: ( ) ( )mentioning

confidence: 99%

“…The output voltage v A of this TL431 biasing circuit can be derived, as shown in (9). Referring to (9), the steady-state DC value of v A is only determined by resistors R 1 and R 2 . The function of capacitor C 1 is to lower the voltage ripple of v A with a drawback of lengthening the rising time of v A .In order to ensure that v A increases to V REF =2.5 V once V AC,RMS reaches 150 V, R 2 is specified as 12 kΩ, which is the minimum resistance of R 2 .…”

Section: ( ) ( )mentioning

confidence: 99%

“…Light-emitting diodes (LEDs) have the advantages of small size, being mercury-free, high efficacy, long lifetime, fast response, and a wide color range [1]- [9], which make them appropriate for a variety of purposes, such as street lighting, traffic lights, LCD backlights, and more [4], [10], [11]. Since LEDs are usually driven by a DC current source, when they are powered by utility voltage, an AC-DC converter is required to not only convert an AC voltage to the specific DC voltage, but also supply power factor correction (PFC) for complying with IEC 61000-3-2 Standard [12] and others.…”

Section: Introductionmentioning

confidence: 99%

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Line-frequency dual input-voltage-level LED driver

Liang

Tseng

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In this paper, a line-frequency dual input-voltagelevel LED driver is proposed. The conventional AC LED topologies are operated with single input voltage level, which cannot be suitable for both two major utility voltage levels of 110 V and 220 V. The proposed LED driver utilizes the automatic parallel/series switching mechanism to achieve the compatibility with the input voltages of 110 V and 220 V. Since the LED driver possesses the current-limiting mechanism, it can prevent LEDs from overcurrent no matter what the input voltage is. Finally, the prototype circuit of line-frequency dual input-voltage-level LED driver is built to verify the performances.978-1-4799-6735-3/15/$31.00 ©2015 IEEE

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Section: ( ) ( )mentioning

confidence: 99%

Section: ( ) ( )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Line-frequency dual input-voltage-level LED driver

Liang

Tseng

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…The inductive scheme is implemented by coupled inductors [8]- [12]. In contrast, the current balancing method based on capacitive scheme has the advantages of high power density and cost effectiveness [13]- [17]. The existing capacitance current balancing circuits, however, all are designed based on half-or full-bridge power converters [18].…”

Section: Introductionmentioning

confidence: 97%

“…However, it also brings a serious problem of reliability. In order to equalize the current among LED strings operated in parallel manner, many current sharing methods have been introduced in [5]- [17] to provide reliable and good current sharing. Manuscript These methods can be grouped into two categories as shown in Fig.1: active and passive methods [9].…”

Section: Introductionmentioning

confidence: 99%

Single-Switch Multichannel Current-Balancing LED Drive Circuits Based on Optimized SC Techniques

Cheng

Lin

et al. 2015

IEEE Trans. Ind. Electron.

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By combining the conventional switched-mode power converters with advanced switched capacitor (SC) techniques, a plurality of single-switch current-balancing circuits are developed to drive multiple LED strings in this paper. Compared with the existing current-balancing LED drivers, the proposed drive circuits exhibit their attractive advantages in size and cost efficiency because just one active switch and one magnetic device are required. LED strings' current can be regulated by controlling the duty ratio of the switch in pulse width modulation (PWM) mode. Both advanced resonant and non-resonant SC methods are introduced to optimize the performance of the proposed LED drivers. The feasibility and theoretical analysis are verified with a 9W dual-channel non-isolated prototype and a 25W four-channel isolated prototype.

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An overview of energy efficient solid state LED driver topologies

Yadlapalli

Narasipuram²,

Anuradha³

2019

Int J Energy Res

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LED lamps are projected as prospective successors of incandescent lamps with high efficiency and a long lifetime. Therefore, there is a need to develop energy efficient LED driver topologies for achieving constant current regulation, despite the effects of temperature on the LED V-I characteristics. This paper presents the salient features of various LED driver topologies with a focus on power density, multi-string operation, renewable energy utilization, soft switching, optical wireless communication, reliability and size. The performance of the above topologies is analysed in terms of the number of components, converter switching frequency, galvanic isolation, power rating and efficiency. This paper takes a look at efficiency improvement methods while dwelling on aspects of lifetime and reliability prediction of LED drivers. The paper will anticipate some of the future trends associated with the adaptation of wide bandgap power semiconductor materials, smart LED lighting for the internet of things (IoT) and programmable LED lamp drivers. This detailed technology review is extremely useful for researchers, designers and engineers in choosing the right topology.

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Capacitor clamped current sharing circuit for multistring LEDs

Cited by 13 publications

References 11 publications

Line-frequency dual input-voltage-level LED driver

Line-frequency dual input-voltage-level LED driver

Single-Switch Multichannel Current-Balancing LED Drive Circuits Based on Optimized SC Techniques

An overview of energy efficient solid state LED driver topologies

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