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

2016 ◽  
Vol 49 (2) ◽  
pp. 277-284 ◽  
Author(s):  
A Chammam ◽  
W Nsibi ◽  
M Nejib Nehdi ◽  
B Mrabet ◽  
A Sellami
Keyword(s):  
Power Factor ◽  
High Intensity ◽  
High Frequency ◽  
Power Factor Correction ◽  
Acoustic Resonance ◽  
Operating Frequency ◽  
Resonant Circuit ◽  
Frequency Variation ◽  
Luminous Efficacy ◽  
Wide Range

The main advantages of high-frequency electronic ballasts for high-intensity discharge lamps are high luminous efficacy, small size, lightweight and longer lifetime. This is why high-intensity discharge lamps operating at high frequency are widely used. This paper proposes an approach for designing resonant circuit electronic ballasts controlled by frequency variation for high-intensity discharge lamps. The proposed technique including an AC/DC rectifier, a power factor correction circuit and a DC/AC half bridge inverter. These electronic ballasts offer a wide range of dimming controls and can avoid acoustic resonance. However, under dimming, the electric and photometric characteristics of the lamp change. In order to study these effects under the process of dimming, this work studies the lamp properties by varying both lamp power and operating frequency.

Modeling of the AC/HF/DC converter with power factor correction

2010 ◽  
Vol 59 (3-4) ◽  
pp. 141-152
Author(s):  
Antoni Bogdan
Keyword(s):  
Power Factor ◽  
High Frequency ◽  
Power Factor Correction ◽  
Modulation Method ◽  
Resonant Circuit ◽  
Modeling Approach ◽  
High Frequency Transformer ◽  
Pulse Density ◽  
Density Modulation ◽  
Correction System

Modeling of theAC/HF/DCconverter with power factor correctionIn this paper, the power factor correction system consisted of: bridge converter, parallel resonant circuit, high frequency transformer, diode rectifier andLFCFfilter is presented. This system is controlled by a pulse density modulation method and the principle of its operation is based on the boost technique. The modeling approach is illustrated by an example usingAC/HF/DCconverter. Verification of the derived model is provided, which demonstrated the validity of the proposed approach.

scholarly journals Contribution to digital power factor correction controllers in high intensity discharge lamps electronic ballast applications

2014 ◽  
Vol 7 (7) ◽  
pp. 1886-1894 ◽  
Author(s):  
Francisco Javier Diaz ◽  
Victor M. Lopez ◽  
Francisco J. Azcondo ◽  
Christian Brañas ◽  
Rosario Casanueva
Keyword(s):  
Power Factor ◽  
High Intensity ◽  
Power Factor Correction ◽  
Electronic Ballast

scholarly journals A Low-Cost Programmable High-Frequency AC Electronic Load with Energy Recycling for Battery Module Diagnostics

2020 ◽  
Vol 10 (2) ◽  
pp. 546
Author(s):  
Chang-Hua Lin ◽  
Kun-Feng Chen ◽  
Kai-Jun Pai ◽  
Kuan-Chung Chen
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Electrical Energy ◽  
Diagnostic Process ◽  
Recycling Rate ◽  
Resonant Circuit ◽  
Wide Range ◽  
Electronic Load ◽  
High Frequency Ac ◽  
Battery Module

A low-cost programmable high-frequency alternating current (AC) electronic load for battery module diagnosis which possesses energy recycling and portability is proposed. The proposed AC electronic load consists of a micro-controller, a signal capturing circuit, and a resonant circuit, and can be integrated with a human–machine interface (HMI). To diagnose the dynamic characteristics of a lithium battery module, the proposed AC electronic load is served as a test load for providing a wide-range slew-rate loading function. In this study, the extracted energy from the tested battery module during the diagnostic process can be recycled to save energy. In addition, all of the battery module parameters and test conditions can be preset in the HMI, and the battery characteristics and the recycling rate of the electrical energy also can be estimated. Analysis of operation modes and simulations and some experimental results are used to verify the theoretical predictions.

Proposal of a 5kVA single-phase on-line UPS with high frequency isolation and power factor correction

2009 ◽  
Author(s):  
Rene P. T. Bascope ◽  
Carlos G. C. Branco ◽  
Cicero M. T. Cruz ◽  
Eduardo F. de Oliveira ◽  
Gean J. M. Sousa
Keyword(s):  
Power Factor ◽  
High Frequency ◽  
Single Phase ◽  
Power Factor Correction ◽  
On Line

Investigation of a ‘transonic resonance’ with convergent–divergent nozzles

2002 ◽  
Vol 463 ◽  
pp. 313-343 ◽  
Author(s):  
K. B. M. Q. ZAMAN ◽  
M. D. DAHL ◽  
T. J. BENCIC ◽  
C. Y. LOH
Keyword(s):  
Computational Study ◽  
Experimental Studies ◽  
Acoustic Resonance ◽  
Internal Boundary Layer ◽  
Internal Boundary ◽  
Frequency Variation ◽  
Length Scale ◽  
Direct Role ◽  
Wide Range ◽  
Quarter Wave

Experimental studies have shown that convergent–divergent nozzles, when run at low pressure ratios, often undergo a flow resonance accompanied by emission of acoustic tones. The phenomenon, different in characteristics from conventional ‘screech’ tones, is addressed in this paper. Unlike screech, the resonant frequency (fN) increases with increasing supply pressure. There is a ‘staging’ behaviour; odd-harmonic stages resonate at lower pressures while the fundamental occurs in a wide range of higher pressures corresponding to a ‘fully expanded Mach number’ (Mj) around unity. Within a stage, fN varies approximately linearly with Mj; the slope of the variation steepens when the angle of divergence of the nozzle is decreased. Based on the data, correlation equations are provided for the prediction of fN. A companion computational study captures the phenomenon and predicts the frequencies, including the stage jump, quite well. While the underlying mechanisms are not completely understood yet, it is clear that the unsteadiness of a shock occurring within the divergent section plays a direct role. The shock drives the flow downstream like a vibrating diaphragm, and resonance takes place similarly to the (no-flow) acoustic resonance of a conical section having one end closed and the other end open. Thus, the fundamental is accompanied by a standing one-quarter wave within the divergent section, the next stage by a standing three-quarter wave, and so on. The distance from the foot of the shock to the nozzle exit imposes the pertinent length scale. The principal trends in the frequency variation are explained qualitatively from the characteristic variation of that length scale. A striking feature is that tripping of the nozzle's internal boundary layer tends to suppress the resonance. It is likely that the trip effect occurs due to a break in the azimuthal coherence of the unsteady flow.

Sign in / Sign up

Export Citation Format

Share Document