Integrated SEPIC buck-boost converter as an off-line LED driver without electrolytic capacitors

Almeida, Pedro S.; Soares, Guilherme M.; Pinto, Danilo Pereira; Braga, Henrique A. C.

doi:10.1109/iecon.2012.6388941

Cited by 51 publications

(34 citation statements)

References 13 publications

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“…For example, if an integrated converter has a shared switch, which must handle the sum of the voltages of the two switches of the corresponding nonintegrated converter, this shared transistor will be forced to be of a higher voltage rating, thus with higher on-resistance and larger conduction losses; a higher voltage stress will also increase the switching losses. These phenomena limit the conversion efficiency of integrated solutions, as can be seen in many integrated offline LED drivers [17], [51]- [57] (PFC integrated with the PC stages), most of which have an overall conversion efficiency of 85% or lower. In cascaded converters with hard-switching operation, the increased losses arising from integration further accentuate the efficiency issue because full power reprocessing is carried out by each stage.…”

Section: Integrated Stagesmentioning

confidence: 98%

Matching LED and Driver Life Spans: A Review of Different Techniques

Almeida

Camponogara

Costa

et al. 2015

EEE Ind. Electron. Mag.

133

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review of various proposed schemes to increase the reliability and life span of solid-state lighting (SSL) systems is presented in this article. Since the mainstream devices employed for such lighting systems are inorganic, high-power light-emitting diodes (LEDs), which are devices characterized by their very long life, most of the questions in reliability and endurability arise from the electronic offline circuit driving the LEDs. Issues regarding the limited reliability of specific components, such as electrolytic capacitors, are introduced. Several power-conversion configurations aimed to capacitance reduction and capacitor technology exchange are put forward as alternative solutions for implementing long-life drivers, with remarks on both their benefits and drawbacks. An extensive literature review on the topic

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Section: Integrated Stagesmentioning

confidence: 98%

Matching LED and Driver Life Spans: A Review of Different Techniques

Almeida

Camponogara

Costa

et al. 2015

EEE Ind. Electron. Mag.

133

View full text Add to dashboard Cite

show abstract

“…The luminous efficacy of a LED is directly dependent of the forward current ripple in the device [11]. As stated in the same study, a load current ripple of 50% is used here as a parameter for the power supply design.…”

Section: B Power Stage Designmentioning

confidence: 99%

A decentralized current sharing control strategy for output parallel-connected DC-DC converters with true redundancy

Oberto

Depexe

Naidon

et al. 2014

2014 11th IEEE/IAS International Conference on Industry Applications

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This work presents a decentralized current sharing control technique for a modular power supply composed of n output parallel-connected DC-DC converters. Each converter is connected to the load through individual line resistance. A phase shifted PWM signal, whose phase is proportional to each converters measured output resistance, is used to control switch state, generating a small power flow at switching frequency between connected units. In order to provide proper load sharing, a voltage reference adjustment for the main control loop is done through the weighted sum of measured reactive power at switching frequency and load current controller output. A distributed power system with three buck converters feeding a 75 W Light Emitting Diode (LED) street lighting fixture is tested with simulations to prove the feasibility of the idea.

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“…The search for efficient and low cost solutions for LED drivers has been the focus of much research today. These devices must provide regulated current to the load and perform the power quality requirements, e.g., as stated in IEC 61000-3-2, when these drivers are fed from the mains [5].…”

Section: Introductionmentioning

confidence: 99%

“…In order to reduce cost, size, and the complexity, the integrated stages and one stage LED drivers are proposed. Integrated stages employ two separate converters implemented with only one active power switch or to form a single-stage solution [5], [9], [10]. State-ofthe-art for a single stage LED driver has been published in [1], [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Single stage switched capacitor LED driver with high power factor and reduced current ripple

Eloi

Mineiro

Santos

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper presents a switched capacitor-based converter to drive high power light emitting diodes (LEDs). Unlike the traditional switched capacitor based one, the proposed converter uses an inductor to avoid the forced charging and discharging operation reducing stress current in circuit. The proposed converter provides inherent power factor correction (PFC) and the switched capacitors are used as isolation capacitors. The proposed converter also uses a LC filter to reduce the output current ripple through LED array instead using a bulk electrolytic capacitor. The basic description of the topology is presented and a laboratory prototype of 48 W has been implemented. The experimental results presented demonstrate the technical feasibility of the proposed converter applied as LED driver.

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Integrated SEPIC buck-boost converter as an off-line LED driver without electrolytic capacitors

Cited by 51 publications

References 13 publications

Matching LED and Driver Life Spans: A Review of Different Techniques

Matching LED and Driver Life Spans: A Review of Different Techniques

A decentralized current sharing control strategy for output parallel-connected DC-DC converters with true redundancy

Single stage switched capacitor LED driver with high power factor and reduced current ripple

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