Design and prototype of LED driver based on the buck converter using FPGA module

2015 ◽  
Author(s):  
Nanang Sulistiyanto ◽  
Mochammad Rif'an ◽  
Onny Setyawati
Keyword(s):  
Buck Converter ◽  
Led Driver

LED Lighting Driver IC Design and Encapsulation Material Research

2014 ◽  
Vol 539 ◽  
pp. 559-562
Author(s):  
Fei Xiang Li
Keyword(s):  
Integrated Circuits ◽  
High Efficiency ◽  
Luminous Flux ◽  
Buck Converter ◽  
Material Research ◽  
Switching Power Supply ◽  
Led Driver ◽  
Led Lighting ◽  
Driving Mode ◽  
Switching Power

Semi-conductor lighting solution LED is developing quickly and now using wider and wider, and will absolutely replace classical lighting solution because of its high efficiency and reliability,long lifetime and low pollution. The development of white LED lighting solution lead to quickly development of the integrated circuits of driving LED,which creates enormous business opportunities. The thesis first describes I-V characteristics and luminous flux curve of LED and its driving circuit briefly. Then display the working theory of buck converter of LED driver. The thesis brings up a buck-mode LED driver which based on switching power supply technology, supplying higher efficiency compared with other driving mode.

scholarly journals Analysis and Control of Electrolytic Capacitor-Less LED Driver Based on Harmonic Injection Technique

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3030 ◽  
Author(s):  
Mahmoud Nassary ◽  
Mohamed Orabi ◽  
Manuel Arias ◽  
Emad Ahmed ◽  
El-Sayed Hasaneen
Keyword(s):  
Power Factor ◽  
Low Frequency ◽  
Buck Converter ◽  
Electrolytic Capacitor ◽  
Injection Technique ◽  
Led Driver ◽  
Harmonic Injection ◽  
Output Capacitor ◽  
And Control ◽  
Led Drivers

AC-DC LED drivers may have a lifespan shorter than the lifespan of LED chips if electrolytic capacitors are used in their construction. Using film capacitors solves this problem but, as their capacitance is considerably lower, the low-frequency ripple will increase. Solving this problem by limiting the output ripple to safe values is possible by distorting the input current using harmonic injection technique, as long as these harmonics still complies with Power Factor Regulations (Energy Star). This harmonic injection alleviates the requirements imposed to the output capacitor in order to limit the low-frequency ripple in the output. This idea is based on the fact that LEDs can be driven by pulsating current with a limited Peak-To-Average Ratio (PTAR) without affecting their performance. By considering the accurate model of LEDs, instead of the typical equivalent resistance, this paper presents an improved and more reliable calculation of the intended harmonic injection. Wherein, its orders and values can be determined for each input/output voltage to obtain the specified PTAR and Power Factor (PF). Also, this harmonic injection can be simply implemented using a single feedback loop, its control circuit has features of wide bandwidth, simple, single-loop and lower cost. A 21W AC-DC buck converter is built to validate the proposed circuit and the derived mathematical model and it complies with IEC61000 3-2 class D standard.

Analysis and improvements of a buck converter based LED driver

2017 ◽  
Author(s):  
Vencislav Cekov Valchev ◽  
Daniela Jekova Mareva ◽  
Dimitar Dimov Yudov
Keyword(s):  
Buck Converter ◽  
Led Driver

Design and Implementation of a Dimmable LED Driver with Low-Frequency PWM Control

2013 ◽  
Vol 284-287 ◽  
pp. 2538-2542
Author(s):  
Hung Liang Cheng ◽  
Chun An Cheng ◽  
Chao Shun Chen ◽  
Kuan Lung Huang
Keyword(s):  
High Frequency ◽  
High Efficiency ◽  
Low Frequency ◽  
Buck Converter ◽  
Duty Ratio ◽  
Buck Converters ◽  
Resonant Converter ◽  
Switching Loss ◽  
Led Driver ◽  
Frequency Pulse

This paper proposes a high-efficiency dimmable LED driver for light emitting diodes (LED). The developed LED driver consists of a full-bridge resonant converter and six buck converters. The function of the full-bridge resonant converter is to obtain a smooth dc-link voltage for the buck converters by phase-shift modulation (PSM) while that of the six buck converters is to drive six LED modules, respectively. The gate voltage of the active switch of each buck converter is a combination of high-frequency and low-frequency pulses. The duty ratio of the high-frequency pulse controls the LED voltage and thereby, controls the amplitude of LED current. LEDs are dimmed by low-frequency pulse-width modulation (PWM) to vary the average current flowing through LED. Circuit equations are derived and circuit parameters are designed. High circuit efficiency is ensured by operating the active switches at zero-voltage switching-on to reduce the switching loss. Finally, a prototype circuit was built to verify the accuracy and feasibility of the proposed LED driver.

scholarly journals DC-DC converter Topologies for LED Driver Circuit: A Review

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Power Factor ◽  
Power Conversion ◽  
Buck Converter ◽  
Led Driver ◽  
Dc Power ◽  
High Power Factor ◽  
Driver Circuit ◽  
Converter Topologies ◽  
Long Lifetime ◽  
Led Drivers

It has been noticed that in commerciallighting, in terms of efficiency light-lamps based on lightemitting diodes(LEDs) are far better as compared to thosewhere traditional high-pressure sodium (HPS) lampswhich are still in use in major underdeveloped anddeveloping areas worldwide in specifically street lighting.The LED driver is an electrical device which controlspower flow to the single LED or a string of the LEDs orcontrols to the current flowing through the LEDs.Available conventional topologies for LED drivers haveseveral demerits such as flickering issues, high losses,luminance problems, low power factor, more number ofswitches etc. So, the need of the hour is to develop efficient,compact, long lifetime, high power factor and flicker-freeLED drivers. The LED have numerous advantages such ashigh luminous efficiency, life span and it has no mercuryin its composition. Therefore, recently researchers of thisarea has been setting a goal to utilize LED as a goodalternative to save electricity from major parts of thisplanet.In this paper, various topologies of LED drivers arepresented. This paper also portrays simulation of a LEDdriver which is based on the combination of the buckboost converter as power factor correction stage (PFC)and buck converter as dc-dc power conversion (PC) stage.Both the stages are integrated using single switch only so itis basically integrated LED driver circuit.

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