Interleaved Buck Converter for Fast PWM Dimming of High-Brightness LEDs

Garcia, J.; Calleja, A.J.; rominas, Emilio López; Gacio, D.; Campa, L.

doi:10.1109/tpel.2011.2121922

Cited by 79 publications

(34 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main drawback of this technique lies in the slew rate of the current regulator because of the fact that the delay and rise times compromise the dimming frequency and increase the time that LEDs spend between zero current level and high current level, where the chromatic characteristics of LEDs are not guaranteed [15]. Another issue concerned is that PWM current is switched ON and OFF alternately, causing the damping or oscillation problems to happen.…”

Section: Introductionmentioning

confidence: 99%

An LED Driver With Pulse Current Driving Technique

Lin

Chen

2012

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

A novel driving technique, called pulse current driving technique for LED driver, is proposed. A complete introduction and analysis of the proposed driving technique and the conventional driving technique will be presented in this paper. The LED driver supply maximum peak current is 220 mA and operating frequency is between 500 kHz and1 MHz. Simulation and experimental results are presented to verify the analytical results. The LED driver is fabricated with CMOS 0.35-μm technology and chip area with pads is 0.89 mm 2 . The design of the proposed circuit structure is simple, without additional output capacitance compensation for stability and with small power consumption, and is implemented in integrated circuit. As a result of the above benefits, the proposed approach is believed to be suitable in portable application.Index Terms-LED driver, pulse current based PWM dimming, pulse current driving technique.

show abstract

Section: Introductionmentioning

confidence: 99%

An LED Driver With Pulse Current Driving Technique

Lin

Chen

2012

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…To reduce the output filter requirement such that electrolytic capacitor can be eliminated from the conventional circuits for the applications of microprocessor or lighting, interleaving technique has already revealed as a possible solution in the literatures [19]- [20]. Similar to our proposed circuit, the output of two converters are connected in parallel to the load and operated with 180 degree phase-shifted.…”

Section: Dual Asymmetrical Half-bridge Convertermentioning

confidence: 99%

Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

Wong

Lai

Loo

et al. 2014

2014 16th European Conference on Power Electronics and Applications

View full text Add to dashboard Cite

A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally.

show abstract

“…Furthermore, to vary the brightness of an LED lamp and satisfy many consumers' demands, a wide range of studies for power converters with the function of dimming control have been carried out [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The Dimmable Single-stage Asymmetrical LLC Resonant LED Driver with Low Voltage Stress Across Switching Devices

Kim¹,

Kim²,

Kim³

et al. 2015

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-In the LED lighting industry, the dimming function in the LED lamp is required by demands of many consumers. To drive this LED lighting, various types of power converters have been applied. Among them, an LLC resonant converter could be applied for high power LED lighting because of its high efficiency and high power density, etc. The function of power factor correction (PFC) might be added to it. In this paper, a dimmable single-stage asymmetrical LLC resonant converter is proposed. The proposed converter performs both input-current harmonics reduction and PFC using the discontinuous conduction mode (DCM). Also, the lower voltage stress across switching devices as well as the zero voltage switching (ZVS) in switching devices is realized by the proposed topology. It can reduce cost and has high efficiency of the driver. In addition, the regulation of the output power by variable switching frequency can vary the brightness of a light. In the proposed converter, one of the attractive advantages doesn't need any extra control circuits for the dimming function. To verify the performance of the proposed converter, simulation and experimental results from a 300W prototype are provided.

show abstract

Interleaved Buck Converter for Fast PWM Dimming of High-Brightness LEDs

Cited by 79 publications

References 36 publications

An LED Driver With Pulse Current Driving Technique

An LED Driver With Pulse Current Driving Technique

Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach

The Dimmable Single-stage Asymmetrical LLC Resonant LED Driver with Low Voltage Stress Across Switching Devices

Contact Info

Product

Resources

About