PWM Series Dimming for Slow-Dynamics HPF LED Drivers: the High-Frequency Approach

Gacio, D.; Alonso, J.M.; Garcia, J.; Campa, L.; Crespo, M.; Rico-Secades, M.

doi:10.1109/tie.2011.2130503

Cited by 130 publications

(60 citation statements)

References 34 publications

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“…If only one channel of Fig.1(b) is considered, conventional PWM dimming scheme does not require the extra dimming switch (Sd1-Sd3) in Fig.2. It achieves PWM dimming by switching the current reference of the converter between Iref and zero [11], [18]. However, the slow slew-rate of the output current (due to the slow dynamics of the converter) during the PWM dimming will substantially limit the dimming frequency of the system (e.g.…”

Section: Sd1mentioning

confidence: 99%

See 1 more Smart Citation

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

Guo

Tan

et al. 2017

IEEE Trans. Power Electron.

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Abstract-This paper presents a single-inductor multiple-outputs (SIMO) LED driver with precise dimming and full dimming range. Based on the coordination of a string-level and a system-level dimming schemes, the proposed SIMO LED driver can overcome practical constraints of existing SIMO LED drivers such as limited dimming range and needs for high-current switches. The proposal can achieve dimming precision up to an accuracy of 1% and also full dimming range. It has the flexibility of using either phase-shift or synchronous PWM switching for dimming control. The proposed circuit and control operations have been practically verified with a 25 W off-line SIMO driven LED system. Practical evaluations of its power quality and energy efficiency are also provided.I.

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Section: Sd1mentioning

confidence: 99%

“…In this way, the power channels will be enabled in a nonoverlapping fashion without cross-interference [13]- [16]. Schematic diagrams of (a) an AC-powered single-inductor-multiple-output LED driver [18] and (b) its electrical equivalent.…”

Section: Introductionmentioning

confidence: 99%

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

Guo

Tan

et al. 2017

IEEE Trans. Power Electron.

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“…[7] One interesting feature of LEDs is the ability to reduce their illumination level without any significant impact upon life and color [8,9] Many studies have been made on methodology for indoor lighting control, e.g., methods for illumination control taking into account natural light [10,11], sensor network control for LED lighting system, and sensorless illumination control. Other publications discuss energy saving potentials of selected outdoor lamps [12] and their lighting control drivers [13,14].…”

Section: Introductionmentioning

confidence: 99%

Improvement of energy efficiency and quality of street lighting in South Italy as an action of Sustainable Energy Action Plans. The case study of Comiso (RG)

Beccali

Bonomolo

Ciulla

et al. 2015

Energy

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Existing street lighting systems in most of Sicilian cities are often inappropriate due to the obsolescence of light sources and luminaires and of unsuitable light control systems unable to provide efficient on-off and dimming strategies. Improvement of energy efficiency in street lighting systems can be one of the key actions adopted by Public Administration in developing Sustainable Energy Action Plan in the framework of the "Covenant of Majors" activities. As a task of FACTOR 20 project a set of planning options have been analysed and proposed for Sicilian cities. Particularly, street lighting efficiency projects have been studied for representative case studies. A detailed survey of the public lighting systems in the city of Comiso (RG) allowed to know and represents current and design performance figures such us installed power, luminance and illuminance levels in roads categories, electricity consumption, switching and dimming schedules. To do this many lighting simulations have been performed. Several scenarios have been proposed. The results obtained show that high improvements of the lighting quality are foreseeable together with large energy and economic saving. The proposed methodological approach can be applied in most of Sicilian and South Italy cities.

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“…Another method is to intentionally increase the output capacitance of the LED driver to mitigate the output voltage variation. Nonetheless, due to the resulted slow system dynamics, the output current of the LED driver will have a slow slew rate, which directly limits the dimming frequency and dimming precision [21], [22].…”

Section: Ieee Transactions On Industrial Electronicsmentioning

confidence: 99%

“…8(b)). A more general and precise small-signal model of buck, boost and buck-boost converter with constant-ON time control can be found in [22], [23].…”

Section: Transient-state Analysismentioning

confidence: 99%

Topology-Transition Control For Wide-Input-Voltage-Range Efficiency Improvement and Fast Current Regulation in Automotive LED Applications

Qin

Hui

2017

IEEE Trans. Ind. Electron.

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Abstract-Automotive LED drivers require special design considerations, which includes voltage step-up and -down function, high energy efficiency and fast current reference tracking capability. Unlike the conventional efficiency improvement methods, which is based on cumbersome circuit/component optimization and/or modification for a single operating point, this paper proposes a simple approach based on topology transition which can achieve a high efficiency for a wide input voltage range. In particular, the topology of the LED driver can change between buck, boost and buck-boost converter according to the level of the input voltage. In addition, a novel current mode controller is proposed such that (i) compatibility to different topologies (ii) seamless topology transition and (iii) fast current reference tracking can be concurrently achieved. The feasibilities of the proposed topology transition method and its control has been experimentally verified through a four-switch buck-boost converter prototype with 7 -45 V input, 25 V/1 A LED strings output. It is shown that there is more than 5% efficiency improvement as compared to the conventional four-switch buck-boost converter. Full range (0%-100%) and precise (1% dimming precision) PWM dimming has also been demonstrated. Index Terms-Automotive LED lighting, non-inverting four switch buck-boost converter, PWM dimming, topology transition control.

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PWM Series Dimming for Slow-Dynamics HPF LED Drivers: the High-Frequency Approach

Cited by 130 publications

References 34 publications

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

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

Improvement of energy efficiency and quality of street lighting in South Italy as an action of Sustainable Energy Action Plans. The case study of Comiso (RG)

Topology-Transition Control For Wide-Input-Voltage-Range Efficiency Improvement and Fast Current Regulation in Automotive LED Applications

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