Long-lifetime SEPIC-buck integrated converter for LED lighting application

Cosetin, Marcelo R.; Luz, Paulo César Vargas; Silva, M. F. da; Bisogno, F.E.; Alonso, J.M.; Prado, R.N. do

doi:10.1109/induscon.2012.6451725

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…A modificação proposta nesse artigo baseou-se na topologia desenvolvida por Cosetin et al (2012). O conversor SEPIC-Buck modificado, em relação à topologia mencionada (Cosetin et al, 2012), produz maior atenuação da tensão de entrada com um menor esforço de tensão no interruptor, pois, essa grandeza está vinculada com o ciclo de trabalho conforme exposto em VSmax na Tabela 5.…”

Section: Comparação Entre Os Conversoresunclassified

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Conversor SEPIC-Buck Modificado com Ampla Atenuação de Tensão e Maior Ciclo de Trabalho

Luz

Camargos

Rodrigues

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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Esse artigo apresenta uma modificação na estrutura do conversor SEPIC-buck. A alteração é realizada por meio da substituição de um dos capacitores do conversor por uma estrutura conhecida como capacitor comutado. Mediante a análise matemática, verificou-se uma maior capacidade de atenuação da tensão de entrada, com a operação de ciclos de trabalhos mais elevados, quando comparado com outras estruturas de conversão similares. A modificação proposta não acarreta em adição nos esforços de tensão e corrente do interruptor e dos demais elementos semicondutores. O conversor SEPIC-Buck modificado foi avaliado por meio computacional e os resultados de simulação validam seu equacionamento e modos de operação.

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Section: Comparação Entre Os Conversoresunclassified

“…Todavia, verifica-se a necessidade de cinco interruptores controlados tornando a estrutura mais complexa e menos robusta. O trabalho apresentado por Cosetin et al (2012) introduz o conversor SEPIC-buck. Essa nova topologia consiste na conexão em cascata dos conversores SEPIC e buck.…”

Section: Introductionunclassified

Conversor SEPIC-Buck Modificado com Ampla Atenuação de Tensão e Maior Ciclo de Trabalho

Luz

Camargos

Rodrigues

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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“…2b, resulting in a single-switch converter. It is worth to mention that this topology was previously presented in [17][18][19][20][21] as a high power factor rectifier, although the study is restricted to the operation in discontinuous conduction mode (DCM). However, the analysis of the DC-DC converter topology operating in CCM has not been presented so far.…”

Section: Proposed Convertermentioning

confidence: 99%

Single‐switch, integrated DC–DC converter for high‐voltage step‐down applications

Oliveira¹,

Morais²,

Tofoli³

2019

IET Power Electronics

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An integrated non-isolated DC-DC converter for applications that demand wide conversion range is proposed in this work. Using a technique known as graft scheme, it is possible to design a single-switch SEPIC-buck converter, where both the input current and the current supplied to the output stage composed of the filter capacitor and the load are non-pulsating when operation occurs in continuous conduction mode (CCM). Therefore, minimised electromagnetic interference (EMI) levels result as a consequence. Besides, the converter requires the use of a single active switch connected to the source reference node, without the need for isolated control circuitry, while it is possible to achieve wider conversion ranges than that provided by the classical buck converter. The qualitative and quantitative analysis of the converter is presented, from which it is possible to design and analyse it. Experimental results are discussed in detail to validate the theoretical considerations.

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“…This condition could probably pass the limit set by the conducted EMI CISPR 22 Class B standards. Some solutions are used to reduce EMI issues in LED drivers, including the converter designs [12], [19], [18], [22], [26]- [32], components design [17], [33]- [35], EMI filter [30], [36] and spread-spectrum techniques [6], [11], [14], [23], [37]- [39]. Of all these solutions, the spread-spectrum technique is a solution that is inexpensive and efficient in mitigating EMI.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Spread-Spectrum Techniques in Mitigating Conducted EMI to LED Luminance

Hariyawan¹,

Hidayat²,

Firmansyah³

2016

IJECE

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Rapid voltage and current changes in recently ubiquitous LED driver have a potency to interfere other devices. Some solutions with special converter design, component design, EMI filter, and spread-spectrum techniques have been proposed. Due to cost-size-weight constraints, the spread-spectrum technique seems to be a potential candidate in alleviating EMI problem in LED application. In this paper, the effectiveness of conducted EMI suppression performance of the spread-spectrum technique is evaluated. Spread spectrum techniques applied by giving disturbance to the LED driver system with three profile signals, filtered square, triangular, and sine disturbance signal to the switching pattern of a buck LED driver topology. From the experiment results, 472.5 kHz triangular and 525 kHz sine signal can reduce EMI by 42 dB while the filtered square signal can reduce EMI 40.70 dB compared to fundamental constant-frequency reference 669 kHz. The filtered square signal can reduce the average power level better than other signal disturbance of 5.852618 dBµV. LED luminance decreases when the spread-spectrum technique is applied to the system. . To achieve high efficiency in energy transfer, switched-mode power supply (SMPS) topology is applied, such as buck, boost, flyback, cuk dan buck-boost [11]- [22]. In addition, the SMPS is widely applied due to the benefits offered in terms of size, weight, cost and performance. SMPS is usually implemented using pulse width modulation (PWM). PWM operates at a constant frequency. The weakness of this system is the fundamental and harmonic frequencies emitted through conducted and radiated mechanism. This emission is called electromagnetic interference (EMI). As a result, the potential converter does not meet the standards of electromagnetic compatibility (EMC) [11],[14][23], [24].SMPS has a periodic switching pattern, i.e. EMI spectrum which consists of the fundamental and harmonic frequencies with significant amplitudes up to the 20th harmonic [25]. This condition could probably pass the limit set by the conducted EMI CISPR 22 Class B standards. Some solutions are used to reduce EMI issues in LED drivers, including the converter designs [12] [39]. Of all these solutions, the spread-spectrum technique is a solution that is inexpensive and efficient in mitigating EMI.In this paper, conducted EMI mitigation is done by applying a spread-spectrum techniques in buck topology LED driver and observing its effect on the LED luminance. Spread spectrum techniques implemented by giving disturbance to the system with 3 profile of waveform signals, filtered square, triangle and sinusoidal waveform signals.

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Long-lifetime SEPIC-buck integrated converter for LED lighting application

Cited by 9 publications

References 12 publications

Conversor SEPIC-Buck Modificado com Ampla Atenuação de Tensão e Maior Ciclo de Trabalho

Conversor SEPIC-Buck Modificado com Ampla Atenuação de Tensão e Maior Ciclo de Trabalho

Single‐switch, integrated DC–DC converter for high‐voltage step‐down applications

The Effects of Spread-Spectrum Techniques in Mitigating Conducted EMI to LED Luminance

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