Impact of current supply on LED colour

Pousset, Nicolas; Rougié, B.; Razet, Annick

doi:10.1177/1477153510373315

Cited by 23 publications

(16 citation statements)

References 8 publications

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“…First, energy efficiency is only the most critical performance issue for incandescent bulbs. Other technologies had their own problems, for example flickering and modulation (fluorescent lighting) (Bruxdrett, Grifft, and Boyce 1973, Wilkins and Clark 1990, Veitch and McColl 1995, Berman et al 1997) and color rendering (LEDs) (Sándor and Schanda 2006, Szabó, Bodrogi, and Schanda 2009, Pousset, Rougié, and Razet 2010, Alvi et al 2011, Smet et al 2012). Second, improved energy efficiency was not what the consumers asked for; the pressure to increase energy efficiency instead came mainly from policy in the form of investments in research of more efficient lighting technologies, new regulations (e.g.…”

Section: Expectation Effectsmentioning

confidence: 99%

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Self-reinforcing Mechanisms in a Multi-technology Industry: Understanding Sustained Technological Variety in a Context of Path Dependency

Onufrey

Bergek

2015

Industry and Innovation

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This paper studies self-reinforcing mechanisms in multi-technology industries, i.e. industries in which technological lock-in does not occur and several technologies continue to co-exist.The purpose of this paper is to investigate what kind of self-reinforcing mechanisms can be present in such industries and explain how multiple paths can co-exist and interact in a context of self-reinforcement and, ultimately, path dependency. Building on the empirical example of the lighting industry, the paper shows that all previously recognized types of selfreinforcing mechanisms can be present in a multi-technology industry. However, in addition to the path-internal positive feedbacks and cross-path negative externalities identified in single-path settings, multi-technology industries also experience positive cross-path externalities that create a symbiotic relationship between alternatives and allow for the reproduction of the same development pattern across technologies. Due to the existence of such non-negative technology interactions, multi-technology industries can be path dependent while still retaining technological variety.

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Section: Expectation Effectsmentioning

confidence: 99%

“…Pousset et al (2010) Solving technical issues of LED lamps related to colour rendering. What was driving the mechanism of see-saw effects during LED advancement across a number of market niches.…”

Section: Source Namementioning

confidence: 99%

Self-reinforcing Mechanisms in a Multi-technology Industry: Understanding Sustained Technological Variety in a Context of Path Dependency

Onufrey

Bergek

2015

Industry and Innovation

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“…Studies have shown that there is a close link between the current through the LED and the characteristic parameters of LED, such as luminous flux [4], the main wavelength [5], color temperature, luminous efficiency [6] and chroma [7], etc. Precision current regulation is the key to studying the LED characteristic parameters, thus the LED drive circuit design has become the focus of research.…”

Section: Introductionmentioning

confidence: 99%

The Remote and High Precision Current Control System of Multiple High Power LEDS

Lin¹,

Liu²,

Sun³

et al. 2017

Proceedings of the International Conference on Communication and Electronic Information Engineering (CEIE 2016)

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For the remote control of multi-channel high power LEDS, a high-precision LED current control system is proposed. A microcontroller system based on STM32F217ZET containing a four-channel high power LED driver circuit based on LT3755-1 was designed. The high-precision current control compensation algorithm is presented, which divides the current control function into three parts and adds proportionality and shift coefficients to the function, improving the current control accuracy from 25% to ±1%. The output current of each channel can be continuously adjusted from 200mA to 1800mA, with the single channel output power able to reach 90W and the output voltage able to reach 50V. The system proposed can be monitored via TCP/IP through the remote PC interface.

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“…Having calculated all the parameters, a relationship between the required output capacitance for a certain peak-to-peak current ripple (ΔI) can be made from (18), as,…”

Section: Bmentioning

confidence: 99%

“…In order to comply with the lifetime requirements of ENERGY STAR ® , this work analyzes the reduction of CX, allowing a certain ripple to appear in terms of the current across the LEDs. This ripple will modulate the amplitude of the light due to the well-known relationship between current and light on an LED [18], hence, causing a perceptible flicker on each phase. It should be noted that, this current modulation of a low frequency ac signal plus a dc signal does not have any impact in terms of the lifetime of the LEDs [19].…”

mentioning

confidence: 99%

Modular three-phase ac-dc LED driver based on summing the light output of each phase

Castro

Arias

Lamar

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-This work proposes the driving of high power Light-Emitting Diodes (LEDs) luminaires in three phase power grids using each phase to drive an independent LED load. The driving is done by means of a boost converter in charge of controlling the current across its LED load. Moreover, each boost converter needs to achieve Power Factor Correction (PFC) to comply with IEC 61000-3-2 Class C requirements. Hence, achieving unity Power Factor (PF) and low Total Harmonic Distortion (THD). Taking advantage of the light properties, the output of the LED driver will be the sum of the light of each of the phases. Therefore, a theoretical study will be carried out to observe the feasibility of removing the electrolytic capacitor while guaranteeing a flicker free behaviour of the LED luminaire, even if the current of each string is pulsating at twice the mains frequency. In order to validate the study, a prototype has been built comprised of three PFC boost converters disposing of their electrolytic capacitors. The designed prototype operates in the full range of the European three-phase line voltage, which varies between 380 V and 420 V, and it supplies an output light of 42.000 lm at a maximum power of 300 W while achieving an electrical efficiency of 97.5%.

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Impact of current supply on LED colour

Cited by 23 publications

References 8 publications

Self-reinforcing Mechanisms in a Multi-technology Industry: Understanding Sustained Technological Variety in a Context of Path Dependency

Self-reinforcing Mechanisms in a Multi-technology Industry: Understanding Sustained Technological Variety in a Context of Path Dependency

The Remote and High Precision Current Control System of Multiple High Power LEDS

Modular three-phase ac-dc LED driver based on summing the light output of each phase

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