Behaviour of a high-intensity discharge lamp fed by a high-frequency dimmable electronic ballast

Self Cite

The objective of this work is to study the influence of a pulsed power supply on the energy efficiency of high-intensity discharge lamps in comparison with a pseudo-continuous ballast. The results presented in this paper concern the dynamic behaviour of discharges in mercury vapour doped with thallium iodide. The acquisition of the arc current, arc voltage and spectral radiation enables us to investigate the influence of the pulsed power supply on the electrical characteristics of the lamp such as the behaviour of the lamp conductance and spectral radiance. The analysis of the 577 nm mercury line’s response to the current pulse excitation allowed us to identify several phases. Good agreement has been found between simulation and experimental results.

Section: Resultsmentioning

confidence: 99%

Assessment of the effect of a pulsed power supply on the HgTlI lamp

Chammam

Nsibi

Mrabet

et al. 2018

Self Cite

“…Natural frequency of oscillation of the standing pressure wave, i.e. the eigenfrequency for a certain AR mode can be computed by equation (1) 9,11 where fnml is the eigenfrequency at an acoustic mode nml (kHz); Ceff is the effective velocity of sound (m/s); l , m , n are integers (0, 1, 2…) representing periodicity along the longitudinal, radial and azimuthal directions, respectively; αnm is the solution of the Bessel Function J'(παnm)=0; L t is the inter-electrode spacing or effective length (mm) of the arc tube and R t is the inner radius (mm) of the arc tube.…”

Section: High-frequency Dimmable E-ballast: Design Prerequisitesmentioning

confidence: 99%

“…One important feature of frequency dimming scheme is that the lamp power ( P lamp ) varies inversely with the driving frequency ( f i ) as per equation (10) provided the input voltage ( V o ) and the values of the circuit components are held constant 11,28 …”

Section: Design Algorithm For Ar-free Dimmable E-ballastmentioning

confidence: 99%

“…Conventionally, the dimming action is accomplished by switching frequency variation of the inverter of an e-ballast. 10–12,18 In spite of these earlier significant contributions in e-ballast design procedures, a few research gaps are identified in these works as mentioned below lack of a systematic and generalized methodology to determine AR-free driving frequencies of e-ballast for a wide dimming range; a single lamp wattage is taken into consideration; an ‘equivalent resistance’ of the HF inverter stage is considered instead of actual arc impedance of the lamp. Because of this approximation, complex equations need to be solved to estimate the ballast circuit parameters. …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A design methodology for acoustic resonance-free, high-frequency, dimmable electronic ballast for high-pressure sodium-vapour lamps

Bakshi¹,

Roy

2019

This paper presents a methodology to design acoustic resonance-free, high-frequency, dimmable electronic ballasts for high-pressure sodium vapour (HPSV) lamps having a range of rated wattage (70–400 W). After estimation of the ‘quiet window’ of an HPSV lamp, the proposed iterative algorithm is able to determine the acoustic resonance-free driving frequencies of a design ballast corresponding to 50%–100% power level. On the other hand, a developed wattage and voltage independent HPSV lamp model facilitates finding the required electrical characteristics of HPSV lamps without performing laboratory experimentation. Using the estimated driving frequencies of a design ballast and the synthesized electrical characteristics of the lamp, the design circuit parameters of an electronic ballast are determined. Performance evaluation of the designed ballasts, carried out on the Matlab–Simulink platform, indicates several important attributes, viz. higher power control accuracy (deviation ≤3.69%), near-unity lamp power factor (≥0.98), lower lamp current crest factor (<1.7) and lower lamp current total harmonic distortion (≤12.63%). Results establish the effectiveness of the proposed design methodology to design lightweight and compact electronic ballasts for HPSV lamps with less effort than conventional design practice.

“…Hence, design of frequency dimmable e-ballast for a particular CFL requires R lamp versus P lamp characteristics of the lamp. 23,27–29…”

Section: Design Of a Frequency Dimmable Electronic Ballastmentioning

confidence: 99%

Wattage-independent dynamic conductance model of compact fluorescent lamps: Validation and application in high-frequency operation

Bakshi¹,

Roy

2017

A wattage-independent (7–18 W) compact fluorescent lamp (CFL) model has been developed in Matlab-Simulink and validated in low-frequency (50 Hz) operation in our earlier work. In this paper, the same lamp model is simulated for high-frequency operation and then validated experimentally with a 9 W test CFL driven by a compatible electronic ballast (e-ballast). Simulation results have shown a maximum 6.4% deviation compared to the measured data. Thereafter, the developed model is applied to obtain the arc resistance versus power and power versus frequency characteristics of CFLs required to design dimmable e-ballasts. An algorithm is developed to compute design parameters of a dimmable e-ballast based on voltage-fed series-parallel resonant inverter topology. The electrical performance of the designed e-ballast is simulated at three different power levels (100%, 75% and 50%) using Matlab-Simulink.