High Power Factor LED Driver with Improved Inductance

This paper proposes a novel high power factor LED driver based on SY5800A for interior-lighting applications. High power factor is achieved by using the transformer with back winding coil and the transformer with “sandwich” winding coil. In addition, the proposed driver features cost-effectiveness, high circuit efficiency, low input current ripples and a reduced components count. A sample driver is developed to supply a 15W LED interior-lighting module with a 0.99 power factor. Experimental results demonstrate the functionalities of the proposed circuit.

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A Novel Single-Stage LED Driver Based for Interior-Lighting Applications

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.610.178 ◽

2014 ◽

Vol 610 ◽

pp. 178-181

Author(s):

Qing Hua Chen ◽

Lun Qiang Chen ◽

Ying Chun Liang ◽

Ying Jun Chen

Keyword(s):

Power Factor ◽

High Power ◽

Operation Mode ◽

Single Stage ◽

Led Driver ◽

Interior Lighting ◽

Time Operation ◽

High Power Factor ◽

Control Scheme ◽

Current Ripples

This paper proposes a novel single-stage LED driver based on SY5814A for interior-lighting applications with high levels of power factor. High power factor is achieved by constant on-time operation mode, with which the control scheme and the circuit structure are both simple. The proposed driver features cost-effectiveness, high circuit efficiency, high power factor, low input current ripples and a reduced components count. A prototype driver is developed to supply a 15W LED interior-lighting module with a 65V output voltage. Experimental results demonstrate the functionalities of the proposed circuit.

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High-power-factor LED driver based on input current shaper using a flyback converter

2015 IEEE Industry Applications Society Annual Meeting ◽

10.1109/ias.2015.7356859 ◽

2015 ◽

Cited By ~ 6

Author(s):

G. G. Pereira ◽

M. F. de Melo ◽

M. A. Dalla Costa ◽

J. M. Alonso

Keyword(s):

Power Factor ◽

High Power ◽

Input Current ◽

Led Driver ◽

Flyback Converter ◽

High Power Factor

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Design of a high performance AC-DC LED driver based on SEPIC topology

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v12.i2.pp870-885 ◽

2021 ◽

Vol 12 (2) ◽

pp. 870

Author(s):

Fouzia Ferdous ◽

A. B. M. Harun Ur Rashid

Keyword(s):

Power Factor ◽

High Power ◽

High Efficiency ◽

System Stability ◽

Input Current ◽

Constant Current ◽

Led Driver ◽

Good Efficiency ◽

Soft Start ◽

High Power Factor

Light emitting diodes (LEDs) are current driven devices. So, it is essential to maintain the stability of LED voltage and current. Variation of temperature may cause of instabilities and bifurcations in the LED driver. Driving LEDs from an offline power source faces design challenges like it have to maintain low harmonics in input current, to achieve high power factor, high efficiency and to maintain constant LED current and to ensure long lifetime. This paper proposes the technique of harmonics reduction by using parametric optimization of Single ended primary inductor converter (SEPIC) based LED driver. Without optimization of SEPIC parameters input energy will not be properly transferred to the load and this un-transferred energy will be transmitted to the source. Consequently, the quality of input current will be hampered i.e. harmonics will contaminate the input current. Focussing this, the paper has presented the design of a non-isolated integrated-stage single-switch constant current LED driver operating in discontinuous conduction mode (DCM) in SEPIC incorporating the design of control circuit with soft start mechanism. This LED driver has achieved a good efficiency (90.6%) and high-power factor (0.98) with reduced harmonics (3.35%). System stability has been determined and simulation studies are performed to confirm the validity of the LED driver circuit. A laboratory prototype is built.

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Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers

Energies ◽

10.3390/en13112989 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2989 ◽

Cited By ~ 1

Author(s):

Claudio Adragna ◽

Giovanni Gritti ◽

Angelo Raciti ◽

Santi Agatino Rizzo ◽

Giovanni Susinni

Keyword(s):

Power Factor ◽

High Power ◽

High Reliability ◽

Design Guidelines ◽

Input Current ◽

Storage Capacitor ◽

Led Driver ◽

Environmental Friendliness ◽

High Power Factor ◽

Led Drivers

Nowadays, LED lamps have become a widespread solution in different lighting systems due to their high brightness, efficiency, long lifespan, high reliability and environmental friendliness. The choice of a proper LED driver circuit plays an important role, especially in terms of power quality. In fact, the driver controls its own input current in addition to the LED output current, thus it must guarantee a high power factor. Among the various LED drivers available on the market, the quasi-resonant (QR) flyback topology shows interesting benefits. This paper aims at investigating and analyzing the different issues related to the input current distortion in a QR flyback LED driver. Several effects, such as the distortion caused by the ringing current, crossover distortion due to transformer leakage inductance and crossover distortion due to the input storage capacitor have been experimentally reported. These effects, not previously studied for a high power factor (Hi-PF) QR flyback, have been analyzed in depth. Finally, some practical design guidelines for a Hi-PF QR flyback driver for LED applications are provided.

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A Novel Single-Switch Single-Stage LED Driver with Power Factor Correction and Current Balancing Capability

Electronics ◽

10.3390/electronics10111340 ◽

2021 ◽

Vol 10 (11) ◽

pp. 1340

Author(s):

Yih-Her Yan ◽

Hung-Liang Cheng ◽

Chun-An Cheng ◽

Yong-Nong Chang ◽

Zong-Xun Wu

Keyword(s):

Power Factor ◽

High Power ◽

Pulse Width Modulation ◽

Power Factor Correction ◽

Harmonic Distortion ◽

Boost Converter ◽

Single Stage ◽

Led Driver ◽

Flyback Converter ◽

High Power Factor

A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, a buck–boost converter and a current balance circuit. Only an active switch and a corresponding control circuit are used. The LED power can be adjusted by the control scheme of pulse–width modulation (PWM). The flyback converter performs the function of power factor correction (PFC), which is operated at discontinuous-current mode (DCM) to achieve unity power factor and low total current harmonic distortion (THDi). The buck–boost converter regulates the dc-link voltage to obtain smooth dc voltage for the LED. The current–balance circuit applies the principle of ampere-second balance of capacitors to obtain equal current in each LED string. The steady-state analyses for different operation modes is provided, and the mathematical equations for designing component parameters are conducted. Finally, a 90-W prototype circuit with three LED strings was built and tested. Experimental results show that the current in each LED string is indeed consistent. High power factor and low THDi can be achieved. LED power is regulated from 100% to 25% rated power. Satisfactory performance has proved the feasibility of this circuit.

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