An Off-line Single-Inductor Multiple-Output LED Driver With High Dimming Precision and Full Dimming Range

Li, Sinan; Guo, Yue; Tan, Siew‐Chong; Hui, S. Y. Ron

doi:10.1109/tpel.2016.2597237

Cited by 57 publications

(31 citation statements)

References 28 publications

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“…19. Using (26), when I o and V o are fixed, we can derive the relationship between I o , D 1 and D 2 , as shown in Fig. 20.…”

Section: The Range Of the Input Voltage In This Case Ismentioning

confidence: 99%

“…A comparatively smaller amount of literature has thus been devoted to discuss the application of CS converters for driving LEDs [22]- [25]. There are two basic dimming methods for LEDs, namely, pulse-width modulation (PWM) dimming and analog dimming [26]. The PWM dimming method is realized by switching on and off an LED string repeatedly while the LED's current is kept constant.…”

Section: Introductionmentioning

confidence: 99%

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Circuit Theoretic Considerations of LED Driving: Voltage-Source Versus Current-Source Driving

Dong

Tse

Hui

2019

IEEE Trans. Power Electron.

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Light-emitting-diodes (LEDs) are solid-state devices with specific v-i characteristics. In this paper we study the basic requirement of the driving circuits and discuss the proper approach to driving LEDs in view of their characteristics. We compare voltage source driving and current source driving, and discuss their relative advantages and constraints. We specifically introduce the use of duality principle for developing new currentsource drivers which are less known but are theoretically more versatile compared to their conventional voltage-source counterparts. The study highlights the effects of the choice of circuit topologies on current and voltage ripples, duty cycle variation, sensitivity, and nonlinearity of LED drivers. This paper presents a systematic and comparative exposition of the circuit theory of driving LEDs, with experimental evidences supporting the major conclusions. Given various forms of input sources and output load characteristics, we generate possible circuit configurations that are suitable for driving LEDs. We illustrate how a basic twostage power supply can lead to an effective LED driver design. Finally, the experiments have been built and tested to validate the theoretical results.

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“…19. Using (26), when I o and V o are fixed, we can derive the relationship between I o , D 1 and D 2 , as shown in Fig. 20.…”

Section: The Range Of the Input Voltage In This Case Ismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Circuit Theoretic Considerations of LED Driving: Voltage-Source Versus Current-Source Driving

Dong

Tse

Hui

2019

IEEE Trans. Power Electron.

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show abstract

“…However, this solution will increase the cost and reduce power density of the driver [10,11]. Correspondingly, the single-inductor multiple-output (SIMO) LED drivers have attracted more and more attention recently [6,9,[12][13][14][15][16]. Here, each constant current module includes an independently series-connected power switch and all the modules are parallel connected to the one end of an inductor.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of a multi‐channel constant current LED driver based on DC current bus distributed power system structure

Luo

Huang

et al. 2020

IET Power Electronics

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The colourful light emitting diode (LED) strings require the corresponding driver to achieve independent control of each output current in the applications of RGB mixed colour LED lighting, LED projection etc. For this purpose, a multi-channel constant current LED driver based on DC current bus distributed power system structure is proposed and analysed here, which is composed of a source converter and several load converters as needed. The source converter adopts the flyback converter to realise power factor correction, electrical isolation, and the load converter adopts the current-type buck converter to realise independent control of the corresponding output current. A 60 W experimental prototype for 42.8 V/0.35 A, 40 V/0.5 A, 35.7 V/ 0.7 A three outputs with the universal input voltages 90-264 V is designed and implemented, and the experimental results are presented to verify the correctness of the theory analysis. 2 Independent closed-loop control strategy The control schematic diagram of the proposed LED driver is shown in Fig. 2. Four current control circuits (CCS) are included to produce the drive signals of Q s , Q 1 , Q 2 and Q 3 , and eventually

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“…In applications where high brightness and high reliability are desired, it is necessary to use numerous LEDs or LED modules configured in the form of LED strings. Each LED string contains several LEDs stacked in series [8][9][10][11][12]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Improved‐efficiency quasi‐two‐stage current‐source‐mode SIMO LED driver

Dong

Tse

2019

IET Power Electronics

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Single-inductor-multiple-output (SIMO) light-emitting-diode (LED) drivers are attractive, practical solutions for lighting applications. An SIMO LED driver is usually constructed with conventional voltage-source-mode dc-dc converters. Currentsource-mode (CSM) converters, though being highly suited for current driving, are less studied. Simple control, low cost and independent dimming function are among the advantages of CSM SIMO converters. The limiting factors of CSM SIMO converters, however, include the relatively low efficiency and the restricted number of outputs under low-frequency pulse-width modulation (PWM) dimming control. In this study, an adaptive current bus technique to the CSM SIMO converter is applied. Results show that a significant improvement in efficiency can be achieved. The low-frequency PWM dimming method is also analysed and redesigned. Also, we compare the voltage stress in the CSM SIMO converter with traditional input-seriesconnected structure. Results show that the CSM SIMO converter achieves a high-voltage step-down ratio without the use of transformers. This study presents detailed analysis and experimental results of the CSM SIMO converter with adaptive current bus.

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An Off-line Single-Inductor Multiple-Output LED Driver With High Dimming Precision and Full Dimming Range

Cited by 57 publications

References 28 publications

Circuit Theoretic Considerations of LED Driving: Voltage-Source Versus Current-Source Driving

Circuit Theoretic Considerations of LED Driving: Voltage-Source Versus Current-Source Driving

Analysis and design of a multi‐channel constant current LED driver based on DC current bus distributed power system structure

Improved‐efficiency quasi‐two‐stage current‐source‐mode SIMO LED driver

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