Flourescent ballast design using passive PFC and crest factor control

Wood, P.N.

doi:10.1109/ias.1998.729945

Cited by 7 publications

(5 citation statements)

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“…Surely, the excessive lamp CCF must be improved. There are many approaches that were proposed to reduce the CCF of VFEB by using frequency control method [9][10][11][12][13][14]. However, some performances of these approaches are not satisfactory.…”

mentioning

confidence: 99%

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

Lee¹,

Hsiao²

2008

Circuit Theory & Apps

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SUMMARYIn this paper, a PWM method to improve the lamp current crest factor (CCF) of the valley-filled electronic ballast (VFEB) is presented. The VFEB has merits of high power factor, simple structure, and low cost. However, it results in an excessive CCF, which will shorten the lifetime of low-pressure discharge lamp. The proposed method controls switching duty ratio by feeding forward the dc-link voltage waveform of VFEB. It decreased the duty ratio with rising of dc-link voltage. Therefore, the proposed method could restrain the lamp peak current and improve the lamp CCF. The control block diagram and basic theory are introduced to improve the CCF. The computer simulations verify the proposed method and derive a minimum lamp CCF. The experimental results demonstrate that the lamp CCF was reduced from 1.9 to 1.58, the ac line power factor is 96%, and the input current THD is 29.3%. The fixed switching frequency operation gains a satisfactory power quality.

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mentioning

confidence: 99%

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

Lee¹,

Hsiao²

2008

Circuit Theory & Apps

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“…The magnitude and duration of this current was a function of the depth of discharge and the value of the resistor in the charging circuit. [7]- [8] The self-resonant L-C circuit and the pulse transformer was the voltage fed self-oscillating half-bridge has been widely used in the ballast design. The two switches in the half-bridge circuit were switched alternatively so that an AC power flows through the lamp load.…”

Section: Luminous Efficacymentioning

confidence: 99%

Examination of T8-T5 Electronic Ballast Adaptor

Cheong

Cheng

Chan³

2006

2006 2nd International Conference on Power Electronics Systems and Applications

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-This paper presented an examination of conversion from T8 conventional fluorescent lamp into a T5 lamp with electronic ballast. Without changing the T8 fixture, a T5 fluorescent lamp can be fitted into the fixture with a T8-T5 electronic ballast adaptor, which provides both power factor correction (PFC) and high frequency switching. The power factor of the overall lighting system was regulated to be 0.98, and the electrical efficiency was 95%. All these features cannot be achieved with the conventional magnetic ballasts.

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“…Para aumentar o FP da corrente de entrada do reator, o emprego de PFC é obrigatório. O circuito de PFC pode ser como o circuito Valley-fill [12], ou empregando conversores chaveados, tais como Boost [14]. Para este trabalho optou-se utilizar o circuito de PFC Valley-fill.…”

Section: B Reator Eletrônico Dimerizávelunclassified

“…Para este trabalho optou-se utilizar o circuito de PFC Valley-fill. Embora o circuito de PFC Valley-fill possa apresentar um bom FP (> 0,95), a ondulação da tensão do barramento é de 50%, o que resulta num FC da corrente da lâmpada superior a 2,1 se nenhuma medida adicional for tomada [12]. Este FC reduz a vida útil da lâmpada, cujo valor máximo recomendado é de 1,7 [13].…”

Section: B Reator Eletrônico Dimerizávelunclassified

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Metodologia De Simulação Empregando O Programa Matlab/simulink Aplicada A Projetos De Reatores Eletrônicos Dimerizáveis

Polonskii¹,

Seidel²,

Eichelberger³

2006

Eletrônica de Potência

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Este artigo apresenta uma metodologia de simulação com o programa MATLAB/Simulink aplicada a projetos de reatores eletrônicos dimerizáveis que alimentam lâmpadas fluorescentes. No trabalho são descritas as etapas para o emprego do simulador e as possibilidades de simulação, assim como as vantagens e desvantagens de utilizar esta ferramenta para projeto. A metodologia é ilustrada através de uma abordagem hierárquica para simulação de um reator eletrônico dimerizável realimentado através da corrente da lâmpada fluorescente. Inicialmente, conforme a metodologia proposta, utiliza-se na simulação um modelo simplificado do reator, enquanto que na etapa seguinte é empregado um modelo mais detalhado. Um protótipo foi implementado para avaliar a metodologia apresentada através da comparação dos resultados experimentais e de simulação. Palavras-Chave-dimerização, eletrônica de potência, lâmpadas fluorescentes, projeto, simulação.

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Flourescent ballast design using passive PFC and crest factor control

Cited by 7 publications

References 0 publications

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

Examination of T8-T5 Electronic Ballast Adaptor

Metodologia De Simulação Empregando O Programa Matlab/simulink Aplicada A Projetos De Reatores Eletrônicos Dimerizáveis

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