High efficiency adaptive boost converter for LED drivers

Lü, Yang; Czarkowski, Dariusz; Bury, W.E.

doi:10.1109/cpe.2011.5942253

Cited by 17 publications

(9 citation statements)

References 3 publications

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“…10(b), it can be found that the LED current I o decreased with the decrease in R 6 . Based on this characteristic, a simple amplitude modulation (AM) LED dimming function can be achieved by using a rheostat as R 6 . When the value of R 6 is decreased manually, the LED current I o will decrease and the brightness of the LED string will become low.…”

Section: Experimental Verificationmentioning

confidence: 99%

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A Loss-Adaptive Self-Oscillating Buck Converter for LED Driving

Chen

Nan

Kong³

2012

IEEE Trans. Power Electron.

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A loss-adaptive self-oscillating buck converter is proposed for high-efficiency and low-cost LED driving. It consists of a self-oscillating unit composed of bipolar junction transistors (BJTs)-type self-oscillating unit, a loss-adaptive BJT driving unit, and a low-loss peak-current sensing unit. In this paper, its operation principle including a loss-adaptive BJT-driving scheme and a low-loss peak-current sensing method is introduced. For experimental verification, a prototype LED driver was implemented with some cheap components and devices for a 24-V lighting system to drive up to six LEDs. The test results show that the prototype LED driver could successfully start up itself and operate highly efficiently in steady state. In order to improve the performance of the proposed buck converter, a useful pulse-width modulation (PWM) LED dimming function is discussed for the future study.

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Section: Experimental Verificationmentioning

confidence: 99%

“…With significantly increasing improvement of the luminous efficacy [1], they, as the next-generation light sources, have rapidly grown in lighting market in these years. In order to achieve stable illumination, LEDs need to be fed with constant currents or pulsating currents of constant amplitudes [2]- [6] by special drivers.…”

Section: Introductionmentioning

confidence: 99%

A Loss-Adaptive Self-Oscillating Buck Converter for LED Driving

Chen

Nan

Kong³

2012

IEEE Trans. Power Electron.

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“…It is obvious that these corrections have to obey continuity conditions of the same form as (11). It is obvious that these corrections have to obey continuity conditions of the same form as (11).…”

Section: Equations For Correctionsmentioning

confidence: 99%

“…This allows to investigate the impact of commonly neglected components or use extensive equivalent models (including, e.g. While many other efforts in research on battery supplied systems are directed towards modification of converter's control, for example, [10,11], the model discussed in this paper allows to observe relations between components, their parasitics and the performance of the driver. The presented model is an alternative to a posteriori modelling like in [10].…”

Section: Introductionmentioning

confidence: 99%

“…The presented model is an alternative to a posteriori modelling like in [10]. While many other efforts in research on battery supplied systems are directed towards modification of converter's control, for example, [10,11], the model discussed in this paper allows to observe relations between components, their parasitics and the performance of the driver. The model provides general theoretical results in analytic form, not involving any computational cost for solving the circuit equations numerically.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of battery‐powered boost DC–DC power LED driver with parasitics by multivariate power series expansion

Rudziński

2014

Circuit Theory & Apps

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This paper presents an analytic model of a battery-powered boost DC-DC converter driving a power light emitting diode. The model is capable of taking into account parasitic components, including series resistances, parasitic capacitances and inductances. Unlike the standard approach to the converter modelling, the discussed model does not require any assumptions concerning current and voltage waveforms. It is based on power series expansion in normalized values of the parasitic components, leading to expressions comprising only physical parameters of the circuit. First-order corrections are derived and illustrated in this paper.

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