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Insight - How Electronic Ballast works

Table of Contents:

Written By: 

Arpit Jain



Electronic ballasts are gradually replacing conventional magnetic ballasts (commonly known as choke) from the fluorescent tubes.  They have higher efficiency as compared to magnetic ballasts and provide a flicker free start up to the tube.  Also it does not produce the ‘hum’ sound which is very annoying with the magnetic ballast. There are two primary functions of the electronic ballast:

1.      To provide the initial high voltage required to ionize the gas, thereby setting up an arc between the two electrodes.

2.      To limit the current through the tube once it has started up. If the current is not controlled it may result in voltage spike thereby damaging the lamp.


The other functions include ignition, warm-up, constant power control, power factor correction, and protection against all lamp and ballast fault conditions.


Electronic Ballast


Electronic ballast as shown in the above image uses semiconductor components and operates at 20 KHz-80KHz unlike the magnetic ballast which operates at 50 -60 Hz. At high frequency the lamp requires less input power, thereby increasing the efficiency.

Electronic Ballast PCB


The PCB that holds all the components of the ballast is shown in the above image. This PCB is enveloped in a rectangular plastic case.


thanx for this information.

hello i would like to know if i can use a 6 wat floresent lamp connected to a 40 wat balasta

thank you

thank u

thanks very much


Dont you have a homemade project for this ou another ballast?


nice tnks


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