A loss-adaptive self-oscillating buck converter for LED driving

Chen, Yi; Nan, Yurong; Kong, Qinggang

doi:10.1109/ecce.2012.6342501

Cited by 7 publications

(7 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At present, many topologies are used for dimming control, such as buck [5]- [8], boost [9], buck-boost-buck [10], flyback [11], buck-flyback-buck [3], half-bridge [12], Cuk [27], and resonant circuits [2], [13]- [17]. These topologies achieve one or more optimization goals, including high efficiency, wide dimming range, wide input voltage range, and costsaving, through their corresponding control strategies.…”

Section: Illumination Control and Visible Light Communication (Vlc)mentioning

confidence: 99%

Full-Range LED Dimming Driver With Ultrahigh Frequency PWM Shunt Dimming Control

Wang

Hou

et al. 2020

IEEE Access

View full text Add to dashboard Cite

This paper explores an ultrahigh dimming frequency Light-Emitting Diode (LED) pulse width modulation (PWM) shunt dimming driver that achieves the full-range dimming. Firstly, the dimming frequency is improved to 20kHz for avoiding flicker and audible noise in high dimming requirements application, such as film and television shooting. Secondly, this paper reduces dimming ratio loss at ultrahigh dimming frequency by removing output capacitor. As a result, given 1% dimming ratio is achieved. Subsequently, for improving LED current square waveform at ultrahigh dimming frequency, it is necessary to suppress parasitic oscillation at the falling edge in LED current. Therefore, this paper proposes a method which connects a fast recovery diode with LED in series. In such way, parasitic oscillation at the falling edge in LED current is suppressed. Meanwhile, linear dimming performance is improved such as dimming linearity of low ratio and circuit reliability. Finally, a 120 W experimental prototype is built to drive an LED array comprising 9 LEDs in parallel and 15 LEDs in series. The switching frequency and dimming frequency of prototype are 500 kHz and 20 kHz, respectively. In addition, it achieves full dimming range of 1% to 99.99%. INDEX TERMS Output capacitance, PWM shunt dimming, ultrahigh dimming frequency, full-range dimming, parasitic parameters.

show abstract

Section: Illumination Control and Visible Light Communication (Vlc)mentioning

confidence: 99%

Full-Range LED Dimming Driver With Ultrahigh Frequency PWM Shunt Dimming Control

Wang

Hou

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…The relationship between illumination and sleep quality has been studied, the study [17] shows that good sleep environment is particularly important to high quality sleep of human body, and the ambient illumination intensity for sleep is a very important factor. The retina can be stimulated from light even eyes are closed.…”

Section: A Lightingmentioning

confidence: 99%

“…The control system can change brightness combined with human body's feeling to different lighting effects, simulate moonlight effect which is the optimum sleep condition for human [15][16].…”

Section: Introductionmentioning

confidence: 99%

Intelligent Dimming LED for Moonlight Simulation

Han

Zhong

Ding

et al. 2015

2015 2nd International Conference on Information Science and Control Engineering

View full text Add to dashboard Cite

In this paper, an intelligent dimming LED nightlight is introduced, it can simulate moonlight and automatically adjust its own brightness according to environment light intensity. Photosensitive resistor module detects external light. Then, the detected intensity converts to a digital value through an AD converter module. This digital value is inputted to a microcontroller, and a PWM wave whose duty cycle can be adjusted is produced to control the brightness of the LED light. According to the relationship among color temperature, illumination and sleep quality, our LED nightlight can simulate the moonlight, output the most appropriate illumination and color temperature for sleep. From the simulation result, it can be seen clearly that with the environment light changes from bright to dark, LED light intensity changes from weak to strong realtimely. The effectiveness of the proposed method has been proved with experiments.

show abstract

“…However, this converter suffer from high number of semiconductor elements (four switches), and the output current is independent of output voltage only under limited conditions. In [5][6][7][8][9], several converters such as buck, buck-boost and flyback converters are discussed as LED driver and their control circuits are compared for this purpose. Conventional flyback converter is applied in discontinuous conduction mode (DCM) mode as LED driver in [5].…”

Section: Introductionmentioning

confidence: 99%

Single soft switched isolated converter with constant output current for light emitting diode driver

Amini¹,

Emrani²,

Adib³

et al. 2014

IET Power Electronics

View full text Add to dashboard Cite

In this study, a single switch soft-switching isolated converter for light emitting diode (LED) driver applications is introduced. In the proposed converter, the transformer parasitic elements are employed as resonant elements to transfer energy and to attain soft-switching condition. The converter constant output current only depends on the input voltage, resonant capacitor, switching frequency and transformer turns ratio. Thus, the converter does not require any current feedback to regulate the LED current. In addition, the adjustment of light emission can be simply accomplished which results in cost reduction and system simplicity. Experimental results are presented to justify the validity of theoretical analysis.

show abstract

A loss-adaptive self-oscillating buck converter for LED driving

Cited by 7 publications

References 25 publications

Full-Range LED Dimming Driver With Ultrahigh Frequency PWM Shunt Dimming Control

Full-Range LED Dimming Driver With Ultrahigh Frequency PWM Shunt Dimming Control

Intelligent Dimming LED for Moonlight Simulation

Single soft switched isolated converter with constant output current for light emitting diode driver

Contact Info

Product

Resources

About