Choke coil in tube lights
In: Home Electricity, Home Appliances, Wiring and Electricity [Edit categories] [Improve] The gas in the fluorescent tube has a high resistance when not lit, so it takes a high voltage to start it glowing.
They are smaller in size and weigh less. You are on page 1of 7 Search inside document What is the use of choke in florescent tubes?
Choke coil in tube lights
In: and the Battle of Hastings, Electrical Engineering [Edit categories] [Improve] The inductance primarily serves to limit current flow to the correct level for the tube. Choke or coil is also used for RF filtering. C voltage is high frequency coils were the oscillation will depend on the input voltage and frequency. What is the function of the choke in a tubelight? It needs some auxiliary components to work. It is basically a figh inductive reactance and on appearing of AC voltage, it produces a high voltage which is ultimately gets applied on the tube elements. This is the source of the audible humming sound people associate with fluorescent lamps. Due to such a high frequency, you will not see the lights flickering and will not hear a buzzing sound with fluorescent lamps using electronic ballasts.
Thus discharge of mercury produces ultraviolet radiation which in turn excites the phosphor powder coating in the tube light thereby delivering the white visible light Thus after the ignition of the tube light starter can be removed from the tube light since it is inactive.
Modern ballast designs use advanced electronics to more precisely regulate the current flowing through the electrical circuit. Ballast loss is less and negligible most of the time.
They can be as simple as a series resistor as commonly used with small neon lamps. Different lamps require specialized ballasts designed to maintain the specific voltage and current levels needed for varying tube designs. Increasing the current in the loop increases the magnetic field, which applies a voltage opposite the flow of current in the wire.
Tube light choke working principle
Fluorescent lamps come in all shapes and sizes, but they all work on the same basic principle: An electric current stimulates mercury atoms, which causes them to release ultraviolet photons. The choke controls the current once the tube has been started, as it has a high impedance at the operating frequency of the tube about 20kHz. Starter gets inactive during operation of tube light. However, electronic ballasts are several times more expensive than the plain passive magnetic models and much more susceptible to certain disturbances and are likely to become themselves a source of disturbances. The lamp started in the same way as one with a choke but the only starting voltage was v RMS form the supply. Although the ionization potential of the neon is little bit more than that of the argon still due to small electrode gap high voltage gradient appears in the neon bulb and hence glow discharge is started first in starter. As a result of this transfer of energy the mercury atom emits an ultra-violet radiation with a wavelength of The capacitor corrects the phase lag caused by the choke and improves the efficiency.
Magnetic Ballasts In addition to not flickering and being quieter than magnetic ballasts, electronic ballasts are preferred because it has many other advantages.
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