High frequency electronic ballast provides line frequency lamp current

Most electronic ballasts for fluorescent lamps provide a sinusoidal lamp current at the switching frequency. The high-frequency current flowing through the lamp can generate significant radiated noise, which is unacceptable in noise-sensitive applications, such as fluorescent lights in airplanes. Using shielded enclosures for the lamps may solve the problem, but it is expensive. A discontinuous conduction mode (DCM) electronic ballast topology is presented which drives the lamp with line frequency current, just like a magnetic ballast. However, compared to a magnetic ballast, its weight is substantially reduced due to operation at 40 kHz switching frequency. The topology also ensures unity power factor at the input and stable lamp operation at the output

A Dimmable Resonant Inverter Electronic Ballast with Unity Power Factor

The conventional line-frequency magnetic ballast is heavy and bulky, which is too kept inside the compact fluorescent lamp (CFL). The paper describes about single stage dimmable electronic ballast with very high power factor and its high efficiency. A compact lamp power circuit is designed by using integrating a buck boost power factor corrector with a current-fed resonant inverter. Then the integration process gives a single power-processing unit that minimizes the number of circuit components. In this paper the proposed resonant inverter will reduces the circulating current in the resonant tank. It also allows simple gate drivers to be used so that isolation devices can be eliminated. The design, analysis and simulation were done using MATLAB SIMULINK. DOI: 10.17762/ijritcc2321-8169.150511

DESIGN OF ELECTRONIC BALLAST OF ONE BALLAST-TWO LAMP SYSTEM USING RAPID START TECHNIQUE

This project is about designing electronic ballast of one ballast–two lamp system using rapid start technique. Rapid start technique will start lamps quickly without flicker by heating the lamps electrodes and simultaneously applying the starting voltage. Rapid start technique is chosen because it provides a low starting voltage about 3.5 volts to the electrodes for one second before lamp ignition. The proposed circuit design consists of full bridge rectifier and boost converter, as a power factor correction (PFC) stage, integrate with a resonant half bridge inverter, used as lamp power control stage. Two lamps connection in parallel will be used as load to verify the objective. All the development of designing electronic ballast using one ballast–two lamp system with rapid start technique and the simulation will be through Multisim. This project is aim to design and improve the electronic ballast based on initial voltage and initial current. It is found that the current to the load is lower when two lamps are used