In this paper a new technique to reduce the LED current ripple and storage capacitance in high power factor (PF) off-line supplies is investigated. The proposed methodology based on use of integrated converters (IPC) implement supply. Thus, first stage operates discontinuous conduction mode (DCM) provide PF. second can be operated either continuous (CCM) or DCM. A family IPCs used as lamp supplies. generalized analysis carried out order obtain important design equations conditions. Finally,...

In this paper, a new technique to equalize light-emitting diode (LED) currents in multiarray LED lamps is proposed. The current through the LEDs controlled by changing inductance of variable inductor. proposed can be employed control each branch independently. operation principle and design example system are presented detail paper. As an example, forward converter has been selected supply branches, which designed operate with one or several outputs. component values as well circuit also...

This work proposes a methodology for directional overcurrent protection coordination in interconnected transmission systems considering possible network contingency state. The uses the short-circuit data of current topology; however, maximum load section each relay is obtained n-1 criterion, already foreseeing disconnection some line. Thus, if line gets disconnected, other protective devices will not improperly actuate by redistribution currents network. objective to propose an adaptive...

A methodological study of an electronic ballast for electrodeless fluorescent lamps (EFLs) including design and development issues is presented in this paper. The intended to feed a 100-W EFL at 250 kHz with dimming feature. proposed topology composed single-ended primary-inductance converter, used as power-factor (PF)-correction stage, integrated resonant half-bridge inverter, lamp-power control stage. integration both stages paper, order reduce the number active switches, well simplify...

This paper presents a feedforward fluorescent lamp power regulation method for self-oscillating electronic ballast different line voltages. The proposed consists in maintaining the regulated through switching frequency variation using output resonant filter feature and gate driver circuit. Experimental results demonstrate feasibility of solution that allows regulating wide input voltage range (110 to 220 V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This paper presents a comparative investigation, design and development issues about six different single-stage topologies, applied as electronic ballasts, for electrodeless fluorescent lamps. The ballast is intended to feed 100 W lamp at 250 kHz, with dimming feature. proposed topologies use converters the power factor correction (PFC) stage: Buck-Boost, SEPIC, Zeta, Cúk, Flyback, Boost. All of them operate in discontinuous conduction mode. A resonant half-bridge inverter used control (PC)...

This paper presents an analysis and design of a Light Emitting Diode (LED) driver aiming to eliminate/substitute the electrolytic capacitors. Considering low lifetime capacitors compared LEDs, this topology aims for reducing storage capacitance replaces it by film capacitor, increasing system lifetime. reduction is based on designing control dynamic with compromise between input current distortion output ripple. The power factor correction (PFC) stage Single Ended Primary Inductance...

A long‐life high‐power‐factor integrated converter able to supply light‐emitting diode (LED) lamps in high‐pressure‐sodium lamp retrofitting applications is presented. The proposed the integration of a buck‐boost with buck converter, thus providing necessary high input power factor and voltage transformation ratio low‐voltage LED array from mains. analysis carried out, design procedure proposed. also performed so that low capacitances are needed at output each semi‐stage. This allows for use...

In this paper a new technique to equalize LED currents in multiarray lamps is proposed. The current through the LEDs controlled by changing inductance value of variable inductor. proposed system can be employed control each branch independently. operation principle and design example are presented paper. As an example, forward converter has been selected supply branches, which designed operate with one or several outputs. components values as well circuit also provided. A prototype...

O uso de recursos da tecnologia no contexto educacional vem sendo discutido nas últimas décadas, entanto com a necessidade do distanciamento social decorrente Covid-19, disruptura tornou-se mais evidente. Nesse sentido, o trabalho consiste um relato experiência sobre rede TikTok educacional. Metodologicamente apoiados Design Based Research, produziu-se uma proposta design, visando engajar os estudantes, matriculados na disciplina Química, processo aprendizagem. Com base nos resultados...

This paper presents the analysis, design and practical considerations of several low cost high-power-factor ballast for compact fluorescent lamps. The proposed topologies are a combination boost converter half-bridge parallel resonant converter. high frequency supply to lamp is made by self oscillating converter, using integrated circuits IR2151 IR51HD420. guaranteed operating in discontinuous conduction mode. These have been developed 20 W lamps 110 V, 60 Hz utility line.

The use of the electrodeless fluorescent lamps has been increasing, because their features such as lifetime and lumen efficiency, when compared to conventional high pressure sodium lamps. single-stage high-power-factor electronic ballast for lamp with dimming feature is presented on this paper. It obtained by integrating a SEPIC converter Half-Bridge asymmetric LCC resonant inverter, which can effectively regulate power. Experimental results are shown, in order validate proposed idea....

This paper presents an electric equivalent model applied to induction electrodeless fluorescent lamps. The is based on passive components and takes into account the real reactive lamp power. presented its obtention methodology will be important tool for ballast designers. One of most features proposed concern regarding core losses characteristics, because nowadays there are no models including these characteristics. In order obtain validate model, a series-parallel resonant half-bridge...

This paper presents a comparative analysis of the performance characteristics among different dimming methods for electronic ballasts using self-oscillating half-bridge (HB) inverter with power factor correction (PFC) stage. Initially, review common presented in literature is presented, and general each method carried out. Furthermore, operation dimmable ballast PFC stage analyzed order to evaluate used. Finally, comparison implemented HB

This paper presents an analysis and design of a Light Emitting Diode (LED) driver aiming to substitute the electrolytic capacitors. Considering low lifetime capacitors compared LEDs, this topology aims for reducing storage capacitance replaces it by longer capacitor, increasing overall system life span. A Proportional Integral (PI) controller is designed reduce output current ripple. Consequently, reduces bus voltage which allows working with reduced capacitances. The input distortion limit...

This paper presents a new high power factor dimmable self-oscillating electronic ballast (DSOEB), in which variable inductor (VI) is used to control the fluorescent lamp (FL) power. Two different approaches are proposed provide wide dimming range using ballast, and correction (PFC) stage. In first one, VI placed series resonant parallel-loaded filter (SRPLI), controlling rms value of current with dc bus voltage supplied by PFC stage closed loop, second stage, directly feeding inverter....

This paper proposes a circuit to compact lamp based on light emitting diodes (LEDs). It aims energy savings, high luminous efficiency and useful life with the replacement of incandescent or fluorescent lamps by LEDs without any change in electrical system installation. In order supply mains constant current, Buck converter has been used because it provides an output voltage lower than input one. The designed 36 52 high-brightness connected series, resulting between 90 V 187 V. load can also...

This paper presents a compact emergency lamp using light emitting diodes (LEDs). The goal is to develop and low cost electronic circuit drive control the current of LEDs arranged in single enclosure. proposed idea allows same equipment daily activities, supplied by mains, under possible failure it. proposal aims energy saving, high luminous efficacy useful life when replacing traditional lighting systems, fluorescent lamps LEDs. use E-27 socket (the used incandescent lamps), provides...

The use of the fluorescent lamps without electrodes (electrodeless) has been increasing, because their features such as lifetime and lumen efficiency, when compared to conventional high pressure sodium (HPS) lamps. This paper presents a luminous flux variation strategy using Single Ended Primary Inductance Converter (SEPIC), which also provides power factor correction, feed electrodeless Since load is variable digital compensation used meet control specified output voltage in project, once...

This paper presents an analysis and design of a Light Emitting Diode (LED) driver aiming to eliminate/ substitute the electrolytic capacitors. Considering low lifetime capacitors compared LEDs, this topology aims for reducing storage capacitance replaces it by film capacitor, increasing system lifetime. reduction is based on designing control dynamic with compromise between input current distortion output ripple. The power factor correction (PFC) stage Single Ended Primary Inductance...

This paper presents an induction electrodeless fluorescent lamp model for simulation, which employs electric equivalents variables inductor and resistance. Because of the negative impedance feature, it is necessary electrical equivalent to perform behavior in simulations. The may be represented by parallel with In this resistance uses exponential inductance polynomial fitting. was implemented OrCAD/PSpice. Simulation results experimental data are presented verify feasibility accuracy.

This paper presents a comparative analysis of dimmable self-oscillating electronic ballast for fluorescent lamps. A review general dimming methods presented in the literature is performed. each method made, and operation with power factor correction was considered order to evaluate characteristic topology define other circuits more adequate this purpose. comparison based on experimental results implemented prototypes carried out establish main conclusion from analysis.

This paper presents an analysis and design of integrated self-oscillating power factor correction (PFC) light emitting diode (LED) driver. The PFC is based on a Single Ended Primary Inductance Converter (SEPIC) operating under Discontinuous Conduction Mode (DCM). converter was chosen because its low input current distortion characteristic making possible reducing, or eliminating, the electromagnetic interference (EMI) filter. LED supplied by asymmetrical Half-Bridge resonant (HB) with...

This paper presents the project of an integrated insulated converter to feed a LED's lamp street lighting systems. An Buck-Boost-Flyback was designed, as well control technique reduce capacitances value and also parameters experimental results converter.

Dimmable high-power-factor electronic ballast is proposed in this paper. The intended to feed a 100 W electrodeless fluorescent lamp (EFL) at 250 kHz. topology consists of buck-boost converter, as power factor correction (PFC) stage, associated with resonant halfbridge inverter, used control (PC) stage. In work, the integration both stages order reduce number active switches, well simplify required driving and circuitry for application. dimming system employed by shared switch duty ratio...