Digital Control Strategy for HID Lamp Electronic Ballasts

With the aim of providing a power supply for the study of dielectric barrier discharge (DBD) excimer lamps (excilamps), a current-mode converter that allows for an accurate adjustment of the electrical power injected into one of those lamps is designed and implemented. Starting from the electrical model of the DBD lamps, the convenience of using a current-mode supply to control the lamp power is demonstrated. With the proposed converter, the current supplied to the lamp has a trapezoidal almost-square shape controlled by means of three parameters, namely, amplitude, duty cycle, and frequency, which provides full control of the lamp electrical power. Implementation is made considering a step-up transformer interfacing the high-voltage lamp with the converter. Experiments demonstrate the operating principle of this converter, including ultraviolet power measurements for a DBD XeCl excilamp. The capabilities of the converter are used to analyze the lamp behavior under different combinations of these three parameters, illustrating its capabilities for finding the optimal operating point of a DBD reactor.Index Terms-Current control, dielectric, dielectric barrier discharge (DBD), excimer lamp (excilamp), ultraviolet (UV).

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“…Comparable solutions have been proposed before for ozone generators [21], [22] and for the dimming of high-intensity discharge lamps [23], [24].…”

Section: Converter Designmentioning

confidence: 99%

Square-Shape Current-Mode Supply for Parametric Control of the DBD Excilamp Power

Florez

Díez

Piquet

et al. 2015

IEEE Trans. Ind. Electron.

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“…The controller was designed taking into account slow dynamics on the lamp impedance variation, which can be modeled as a slow time varying resistance. Inverter input DC voltage (fast dynamics) variations were also considered [27], [29].…”

Section: Power Controlmentioning

confidence: 99%

Harmonics Injection in Hps Electronic Ballast With Modulation Index Control

Morais¹,

Donoso-Garcia²,

Júnior³

et al. 2013

Eletrônica de Potência

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The modulation index control is used in this work to control the lamp power supply permitting the removal of the output transformer out of the inverterresonant filter setup. The Acoustic resonance in HPS lamps can be avoided by using a controlled PWM inverter and third harmonic injection.Experimental and simulation results are shown for the control of the inverter power subject to variation in the input voltage. Results for different DC bus voltages are also provided which attest the transformer removal and avoid the acoustic resonance with different modulation indexes. An ignitor for high-intensity discharge lamps, based on forced oscillation via an external periodic voltage square wave, supplied by a digitally controlled inverter, is also presented. The crest factor of the current can also be reduced by this approach.1

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“…A análise detalhada sobre a implementação do sistema de controle e da modelagem desse conversor está presente em [21].…”

Section: Buck Bi-flybackunclassified

Integração de Conversores PFC com a Topologia Bi-flyback Inversora Aplicado a Lâmpadas de Descarga em Alta Pressão

Kirsten¹,

Costa²,

Luz³

et al. 2013

Eletrônica de Potência

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Resumo -Este artigo apresenta uma família de reatores eletrônicos para alimentar uma lâmpada de vapor de sódio em alta pressão de 70W. O reator eletrônico consiste em um conversor de estágio único que integra um conversor de correção do fator de potência e dois conversores flyback para alimentação da lâmpada com forma de onda quadrada em baixa frequência, de modo a evitar o fenômeno de ressonância acústica. Propõe-se um estudo, qualitativo e quantitativo, dos conversores convenientes para correção do fator de potência, e sua integração com a topologia bi-flyback inversora. A topologia buck bi-flyback inversora é escolhida para a implementação prática do experimento a fim de validar o presente estudo.Abstract -This paper presents a set of electronic ballasts to supply a 70W high pressure sodium lamp. The electronic ballast consists on a single-stage converter that integrates a PFC converter to provide power factor correction and two flyback converters to supply the lamp with low frequency square waveform, in order to avoid the acoustic resonance phenomenon occurrence. A study is proposed, qualitative and quantitative, of active converters to provide the power factor correction, and their integration with the bi-flyback inverter topology. Buck bi-flyback inverter topology is chosen to the implementation of practical experiments, in order to validate the present work.

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Digital Control Strategy for HID Lamp Electronic Ballasts

Cited by 21 publications

References 37 publications

Square-Shape Current-Mode Supply for Parametric Control of the DBD Excilamp Power

Square-Shape Current-Mode Supply for Parametric Control of the DBD Excilamp Power

Harmonics Injection in Hps Electronic Ballast With Modulation Index Control

Integração de Conversores PFC com a Topologia Bi-flyback Inversora Aplicado a Lâmpadas de Descarga em Alta Pressão

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