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A Novel Integrated Circuit Driver for LED Lighting  [PDF]
Yanfeng Jiang, Dong Zhang, Ming Yu
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.57018
Abstract: A novel integrated circuit for driving LED lighting has been proposed, designed and fabricated. Besides the typical parts of LED driver, an integral part was added at the output terminal of error amplifier in the driver. In this way, a novel average current mode can be set up to take the place ordinary peak current control mode. In addition, a BUCK low-level topology was adopted, too. It can be used to drive up to eight 1 W HB LED lights with 350 mA constant current. In this way, the LED driver displays high performance, in which output current with less 1% error and total efficiency as high as 96%. The feasibility of the design has been verified by actual measurement on the fabricated chip.
Design and Implementation of 12V/24V Closed loop Boost Converter for Solar Powered LED Lighting System
P.Sathya,Dr.R.Natarajan
International Journal of Engineering and Technology , 2013,
Abstract: this paper presents the design and implementation of high performance closed loop Boost converter for solar powered HBLED lighting system. The proposed system consists of solar photovoltaic module, a closed loop boost converter and LED lighting module. The closed loop boost converter is used to convert a low level dc input voltage from solar PV module to a high level dc voltage required for the load. To regulate the output of the converter, closed loop voltage feedback technique is used. The feedback voltage is compared with a reference voltage and a control signal is generated and amplified. The amplified signal is fed to 555 Timer which in turn generates a PWM signal which controls the switching of MOSFET. Thus by switching of MOSFET it would try to keep output as constant. Initially the boost converter, timer circuit, amplifier circuit and LED light circuits are designed, simulated and finally implemented in printed circuit board. The simulation studies are carried out in MULTISIM. Theexperimental results for solar PV and boost converter obtained in both software and hardware are presented here.
一种用于LED照明中的组合式Boost-Cuk变换器
A Combined-Type Boost-Cuk Converter for LED Lighting System
 [PDF]

王琳, 章家岩, 胡雪峰
Instrumentation and Equipments (IaE) , 2014, DOI: 10.12677/IaE.2014.22002
Abstract:
本文提出了一种基于Boost拓扑与Cuk拓扑有机组合思路的适用于LED照明系统中的组合式Boost-Cuk变换器,Boost环节与Cuk环节共用输入支路,使该变换器通过一个开关管同时实现两路输出,一路输出为Boost型,另一路输出为Cuk型。Boost环节与Cuk环节的输出串联,提高了该变换器的输出电压增益。为了灵活控制输出,只需一个控制器便可以实现多种方式的输出。仿真结果证明该拓扑结构性能与理论分析一致。
A Combined-type Boost-Cuk converter for LED lighting system was proposed based on the combi-nation of Boost and Cuk topologies. The converter using a switch can simultaneously achieve two kinds of output by sharing the branch of the input side of the two topologies mentioned. One of the outputs for the converter is Boost-type, and the other one is the Cuk-type. The voltage gain of the converter is improved with the output of Boost and Cuk topologies proposed in series connected. In order to control the output, only one controller can achieve the output in various ways. The si-mulation results are given to verify the consistence between the performance and theoretical analysis of the topology.
谐振式单开关多路输出Boost LED驱动电源
Resonant single-switch multi-string boost LED driver converter
 [PDF]

许建平, 杨琦, 刘雪山
XU Jianping
, YANG Qi, LIU Xueshan

- , 2016, DOI: 10.3969/j.issn.0258-2724.2016.03.007
Abstract: 提出了一种谐振式单开关多路输出Boost LED驱动电源及其控制电路,分析了其工作原理及特性.该多路输出Boost LED驱动电源只需要使用1个开关管,1个谐振电感和2n-1个谐振电容就能实现2n路输出的恒流控制,具有变换器电路结构与控制简单、体积小、效率高以及成本低的特点.利用谐振电容的充放电平衡原理,仅需控制其中任意一条输出支路电流,即可实现2n路输出支路的恒流及均流控制;此外,该多路恒流输出LED驱动电源具有固有的短路保护特性,任何一条输出支路短路不会影响其它输出支路的稳态电流.最后,搭建了一台48 W的四路恒流输出实验样机,验证了理论分析的正确性.
: A novel resonant single-switch multi-string boost LED driver converter was proposed, the operation principle and characteristics of which were analyzed. It can achieve current balancing among 2n LED strings by using only one active switch, one resonant inductor and 2n-1 resonant capacitors. Thus it boasts the benefits of simple circuit structure and control, small volume, high efficiency and low cost. By controlling only one output current, the other output currents of this LED driver can be controlled utilizing the charge balance principle of resonant capacitors. If one output branch of the LED driver is short-circuit in the steady state, it will not affect current sharing among the other output currents. Therefore, it has a characteristic of natural short-circuit protection. Finally, the theoretical analysis is verified by a 48 W four-string prototype
Study of Bifurcation and Chaos in the Current-Mode Controlled Buck-Boost DC-DC Converter (I) --Modeling and Simulation
Buck-Boost DC-DC变换器中分叉与混沌问题的研究(Ⅰ)——建模与仿真(英文)

WU Jie,LIU Mingjian,YANG Ping,
吴 捷
,刘明建,杨 苹

控制理论与应用 , 2002,
Abstract: This paper studies the bifurcation and chaos in current-mode controlled Buck_Boost converter. The discrete model for Buck-Boost converter in continuous conduction mode (CCM) is derived. The bifurcation and chaos phenomena of Buck_Boost converter have been investigated with input voltage E, reference current I ref,resistor R, inductor L and capacitor C as bifurcation parameters.
A Comparative study of Analog and digital Controller On DC/DC Buck-Boost Converter Four Switch for Mobile Device Applications  [PDF]
Benlafkih Abdessamad,Krit Salah-Ddine,Chafik Elidrissi Mohamed
International Journal of Computer Science Issues , 2013,
Abstract: this paper presents comparative performance between Analog and digital controller on DC/DC buck-boost converter four switch. The design of power electronic converter circuit with the use of closed loop scheme needs modeling and then simulating the converter using the modeled equations. This can easily be done with the help of state equations and MATLAB/SIMULINK as a tool for simulation of those state equations. DC/DC Buckboost converter in this study is operated in buck (step-down) and boost (step-up) modes.
A Comparative study of Analog and digital Controller On DC/DC Buck-Boost Converter Four Switch for Mobile Device Applications  [PDF]
Benlafkih Abdessamad,Krit Salah-ddine,Chafik Elidrissi Mohamed
Computer Science , 2013,
Abstract: This paper presents comparative performance between Analog and digital controller on DC/DC buck-boost converter four switch. The design of power electronic converter circuit with the use of closed loop scheme needs modeling and then simulating the converter using the modeled equations. This can easily be done with the help of state equations and MATLAB/SIMULINK as a tool for simulation of those state equations. DC/DC Buckboost converter in this study is operated in buck (step-down) and boost (step-up) modes.
Nonlinear Phenomena in Buck-Boost Power Factor Correction Converter  [cached]
Mehrnoosh Vatani,Soodabeh Soleymani,Mehrdad Ahmadi Kamarposhti
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: Buck-Boost Power-Factor-Correction (PFC) converter with Average-Current-Model (ACM) control is a nonlinear circuit because of the multiplier using and large change in the duty cycle, so its stability analysis must be studied by nonlinear model. In this paper double averaging method is used for describing the model of this converter. By this model we would be able to explain the low frequency dynamics of the system and identify stability boundaries according to circuit parameters and also nonlinear phenomena of this converter are detected.
Mode shift and stability control of a current mode controlled buck-boost converter operating in discontinuous conduction mode with ramp compensation

Bao Bo-Cheng,Xu Jian-Ping,Liu Zhong,

中国物理 B , 2009,
Abstract: By establishing the discrete iterative mapping model of a current mode controlled buck-boost converter, this paper studies the mechanism of mode shift and stability control of the buck-boost converter operating in discontinuous conduction mode with a ramp compensation current. With the bifurcation diagram, Lyapunov exponent spectrum, time-domain waveform and parameter space map, the performance of the buck-boost converter circuit utilizing a compensating ramp current has been analysed. The obtained results indicate that the system trajectory is weakly chaotic and strongly intermittent under discontinuous conduction mode. By using ramp compensation, the buck-boost converter can shift from discontinuous conduction mode to continuous conduction mode, and effectively operates in the stable period-one region.
Voltage Tracking of a DC-DC Buck-Boost Converter Using Neural Network Control  [PDF]
W.M.Utomo,,Z.A. Haron, A. A. Bakar, M. Z. Ahmad, Y.M.Y Buswig and S.F. Mansour
International Journal of Computer Technology and Electronics Engineering , 2011,
Abstract: This paper proposes a neural network control scheme of a DC-DC Buck-Boost converter to produce variable DC voltage source that will be applied on DC motor drives. In this technique, a back propagation learning algorithm is derived. The controller is designed to track the output voltage of the DC-DC converter and to improve performance of the Buck-Boost converter during transient operations. Furthermore, to investigate the effectiveness of the proposed controller, some operations such as starting-up and reference voltage variations are verified. The numerical simulation results show that the proposed controller has a better performance compare to the conventional PI-Controller method.
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