Wednesday, January 1, 2020

Why do we hear a buzzing sound from switched on tubelights ?

I have a tubelight in my house . Whenever I switched on it , it starts producing a huge sound . If the surrounding area is quite , its volume is so high that I am not able to hear the sound of tv also !


I decided to do some research on the topic .


There are 2 sources of noise in a tubelight .

1 . Choke
2. Tube holder


Choke is on the center of tube light . What we see a rectangular structure at the centre of the tube light is known as the choke .


Choke is used to reduce the current flow to the tube . Current is generally controlled by using an inductor coil or a transformer .


When the choke is used for many days , the transformer inside it gets faulty . It starts to lose its magnetostriction effect in its core , hence producing a buzzing sound .



If we use an electrical choke , we can minimize the sound .



2 . Tube holder ----  Tube holder is the place where the choke is placed . It is usually made of ferrous material . When leakage magnetic field of choke acts on it ,  certain parts of it gets magnetized thus creating the mechanical stress . This stress produces buzzing sound .

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