LED Driver With Self-Adaptive Drive Voltage

Hu, Yingying; Jovanovic, M.M.

doi:10.1109/tpel.2008.2004558

Cited by 292 publications

(112 citation statements)

References 19 publications

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“…The powerconversion efficiency of this driver is about 91% at the PVDD of 38 V and the channel current of 50 mA with twelve LEDs for all channels. Compared to other multi-channel driver [1], power-conversion efficiency of this proposed LED driver is improved because voltage optimization has been done independently for each channel. In other words, even though LEDs at each channel have different forward voltage, there is no excess voltage at the individual constant current source.…”

Section: Resultsmentioning

confidence: 99%

“…and compromising reliability, and to obtain predictable and matched optical properties which are directly related to their forward current [1,2,3]. It is possible that LED drivers provide several solutions for this driving scheme.…”

mentioning

confidence: 99%

“…It is possible that LED drivers provide several solutions for this driving scheme. Such an LED driver can be realized using a linear or switch-mode type [1,4]. A typical LED driver, either linear or switch-mode driver, is basically a type of output voltage regulator, and thus has to be converted to an output current regulator.…”

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confidence: 99%

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Multi-channel LED driver with self-optimized active current regulator

Park

Yoon

2011

IEICE Electron. Express

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A novel multi-channel LED driver is presented, consisting of an active current regulator and a switch-mode voltage regulator for each channel. This driver is implemented using a 0.35 µm 40 V high voltage process. The active current regulator directly controls an LED-current without any current-sensing resistor and its operating voltage is self-optimized by the switch-mode voltage regulator. This self-optimization is successfully achieved and the active current regulators have channel-current deviations of a maximum of ±2%. Its power-conversion efficiency is up to 91% at the load power of 7 W. Keywords: LED, driver, current-sensing resistor, self-optimization Classification: Electron devices, circuits, and systems References[1] Y. Hu and M. M. Jovanović, "LED driver with self-adaptive drive voltage,"

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Section: Resultsmentioning

confidence: 99%

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Multi-channel LED driver with self-optimized active current regulator

Park

Yoon

2011

IEICE Electron. Express

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“…The power consumption of LED is affects to the life of the LED lighting device by changing the internal temperature of the LED through operating of the control logic. Also, the LED lighting control system should be provides exceptional identification skills of things and high color rendering by considering the energy savings [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An efficient LSDM lighting control logic design on lighting control system

Hong¹,

Lin²

2014

16th International Conference on Advanced Communication Technology

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Abstract-In this paper, we propose an efficient LSDM lighting control logic design on lighting control system. The proposed LSDM lighting control logic is designed according to the operating conditions by the divide as the signal control part for I/O data bus and the timer/counter part for clock signal control. Also, the control logic is transmitted to MCU through a data bus by the environmental information detected from each sensor node. The propose LSDM lighting control logic was measured to power loss rate of the control logic in order to demonstrate the efficiency by applied to the control system. And it was proves that be effective to overall power consumption reduction.

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“…These harmonic currents source for numerous complications are like voltage distortion, noises, heating results in diminished efficiency of the power system. Due to this fact, there is a need for power supplies that obtain current with low harmonic content and have PF close to unity [9]. The traditional boost topology is the most extensively employed topology for the purpose of PFC applications.…”

mentioning

confidence: 99%

Fuzzy Logic Controller Based Bridgeless Isolated Interleaved Zeta Converter for LED Lamp Driver Application

Thenmozhi

Sharmeela

Natarajan³

et al. 2016

IJPEDS

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In recent times, high-brightness light emitting diodes (HB-LEDs) are developing rapidly and it is confirmed to be the future development in lighting not only because of their high efficiency and high reliability, however also because of their other exceptional features: chromatic variety, shock and vibration resistance, etc. In this paper, a bridgeless (BL) Isolated Interleaved Zeta Converter is proposed for the purpose of reducing the diode failures or losses; the value of output ripples also gets decreased. The proposed BL isolated interleaved zeta converter operating in discontinuous conduction mode (DCM) is used for controlling the brightness of LED Driver with inherent PFC at ac mains using single voltage sensor. The fuzzy logic controller (FLC) is used to adjust the Modulation Index of the voltage controller in order to improve the dynamic response of LED Lamp driver. Based on the error of converter output voltage, FLC is designed to select the optimum Modulation Index of the voltage controller. The proposed LED driver is simulated to achieve a unity power factor at ac mains for a wide range of voltage control and supply voltage fluctuations. Keyword:Diode bridge rectifier Discontinuous conduction High-brightness light emitting Power factor correction LED lamp Zeta converter Copyright © 2016 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Thenmozhi R, Dept of Electrical and Electronics Engineering, Anna University Sarder Patel Road, Old Highways Building, Guindy, Chennai, India Email: thenmozhirresearch@gmail.com INTRODUCTIONHigh-brightness (HB) LEDs are extremely smart light sources because of their exceptional features (high efficiency and prolonged existence, and low-maintenance conditions) [11]. Since they are driven from a DC source, several categories of power switching converter can be employed to adapt primary energy sources to the constraints of HB LEDs [13]. Several researchers have formulated different DC-DC converter topologies in accordance with the conventional DC-DC switching power converters [9, 15 and 16].In contrast, when the primary energy source is the AC line, subsequently certain category of AC-DC converter must be positioned between the line and the HB LEDs [10,12]. It is found that, when the total power managed by these converters is above 25 W, at that time the low-frequency harmonic content of the line current have to satisfy particular rules. For the purpose of lighting equipment, the most extensively employed standard is EN 61000-3-2, Class C [18] [23,24].The bridge rectifiers contribute to high total harmonic distortion (THD), small PF, and low efficiency to the power system. These harmonic currents source for numerous complications are like voltage distortion, noises, heating results in diminished efficiency of the power system. Due to this fact, there is a need for power supplies that obtain current with low harmonic content and have PF close to unity [9]. The traditional boost topology is the most extensively employed topology for the ...

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LED Driver With Self-Adaptive Drive Voltage

Cited by 292 publications

References 19 publications

Multi-channel LED driver with self-optimized active current regulator

Multi-channel LED driver with self-optimized active current regulator

An efficient LSDM lighting control logic design on lighting control system

Fuzzy Logic Controller Based Bridgeless Isolated Interleaved Zeta Converter for LED Lamp Driver Application

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