Thursday, November 29, 2012

Tubelight starter-working

Nowadays, fluorescent lights are mostly used lighting system.It is being filled with mercury vapor.Electric charges are used to excite mercury atoms to provide ultraviolet light.starter is used in the tube light circuit to provide an initial current to filaments of the tube light.Look below to understand the purpose of starter.

Current will not pass in to the circuit as soon as the switch is pressed because the gas inside it is not ionized and the tube light behaves a open circuit.  Once the gas is ionized, it will provide a conduction path for the current to flow.Hence to ionize,an initial high is required for a short period of time across the filament of the main tube.This work is being done by a starter.
By conclusion,
To make the tube light to be ON ,it must be ionized using the starter current.



Courtesy:engineersgarage.com

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2 comments:

  1. Here's the correct description of starting a fluorescent tube:
    Fluorescent tubes are used in all types of lighting systems. It is filled with argon gas and a tiny amount of mercury vapour to reduce the starting voltage.
    Argon gas of this length would normally take thousands of volts to "strike."
    The tube is connected as shown in the diagram and when power is applied, the starter starts to glow.
    Current will not pass through the tube because the gas inside it is not ionized and it behaves as a open circuit.
    The starter contains a tube with neon gas and this gas needs about 70v to 90v for it to glow.
    Also inside the starter is a bimetallic switch that is open. The glowing gas heats up the bimetal strip and it closes.
    This allows current to flow through the ballast and the filaments at the ends of the fluorescent tube.
    The filaments heat up the gas in the tube (at the ends) and the mercury vapour and the electrons are excited.
    The gas in the starter ceases to glow (because the bimetal strip has closed) and the bimetal strip cools down and opens.
    This allows the current in the ballast to collapse and it produces a higher voltage.
    This voltage (together with the mains voltage) is sufficient to "strike" the tube and immediately the voltage across the tube drops to about 90v.
    The ballast now takes up the difference between the supply voltage and the tube voltage.
    If the tube were placed directly across the supply, it would take a very high current and blow up.
    The voltage across the starter is now not enough to re-strike the neon gas and it remains "off."

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  2. tube light starter works like a fuel in a car it passes the current and to the circuit and switch on the tube light

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