How does tube light choke work?
How does tube light choke work?
Choke is an inductor; hence it acts as a pure inductor. Inductor is having the properties of creating high voltage at stating. This high voltage is enough to trigger the tube lights starter.
On which principle does fluorescent tube light work?
Principles of operation A fluorescent lamp generates light from collisions in a hot gas (‘plasma’) of free accelerated electrons with atoms– typically mercury – in which electrons are bumped up to higher energy levels and then fall back while emitting at two UV emission lines (254 nm and 185 nm).
What is a choke tube light?
The purpose of the choke is to provide a very high voltage initially between the filaments (across the two ends of the tube light). Again once the gas in the tube is ionized the choke provides a low voltage. A choke is a coil of wire. Fluorescent tubes/lamps are filled with mercury vapor.
What is the function of choke in fluorescent tube?
The choke primarily serves to limit current flow to the correct level for the tube. It also can be used during startup to provide an inductive ‘kick’ forming a momentary higher-voltage pulse to start the lamp.
Why starter is used in tube light?
The starter (which is simply a timed switch) allows current to flow through the filaments at the ends of the tube. The current causes the starter’s contacts to heat up and open, thus interrupting the flow of current. The tube lights.
What is the function of choke and starter in a tube light?
The starter connects the heatting filaments, so they start to emit electrons and after a short time opens the circuit. The current flowing through the choke continues to flow, because the energy in its iductance has to go somewhere, charging the parasitic capacitances and the voltage increases until the gas ionizes.
Which gas is used in Tubelight?
A fluorescent lamp tube is filled with a gas containing low pressure mercury vapor and argon, xenon, neon, or krypton. The pressure inside the lamp is around 0.3% of atmospheric pressure.
Are fluorescent lights AC or DC?
Fluorescent tubes are almost always powered with AC, but this circuit uses DC. Basically, this circuit is a voltage doubler composed by two 1N4007 diodes and two high voltage electrolytic capacitors of 10 μF 350 V. Such capacitors can be easily salvaged from compact fluorescent lamps.
What is the working principle of choke?
Hint: A choke coil works by the principle of self induction. Its main function is to provide AC resistance to the circuit. At the same time, it does not allow any resistance to the DC current.
Why is choke used?
A choke, also known as an inductor, is used to block higher-frequency while passing direct current (DC) and lower-frequencies of alternating current (AC) in an electrical circuit. The name comes from blocking, or “choking”, high frequencies while passing low frequencies.
Which function of choke is in?
In electronics, a choke is an inductor used to block higher-frequency alternating currents while passing direct current (DC) and lower-frequencies alternating current (AC) in an electrical circuit.
What is the main function of starter?
Introduction. Motor starters are one of the major inventions for motor control applications. As the name suggests, a starter is an electrical device which controls the electrical power for starting a motor. These electrical devices are also used for the purpose of stopping, reversing and protecting electric motors.
How does the choke ballast work in a tube light?
Answer Wiki. Choke ballast is basically an inductor. An inductor will oppose a rise in current by opposing the source of current by inducing a voltage opposing the source voltage and vice versa. The voltage actually induced depends on the inductance (core magnetism, number of wire turns) of the ballast and can be made arbitrarily large.
What is the purpose of a choke in a fluorescent light?
Magnetic choke (magnetic ballast) functions are to limit the current in the starter during bimetallic contact shorting, provides the high voltage across tube light in conjunction with the starter to ionize gas in the tube light and it also limits the current and voltage in tube light during ON condition of tube light.
Why are chokes used in tube light starter?
Choke is an inductor; hence it acts as a pure inductor. Inductor is having the properties of creating high voltage at stating. This high voltage is enough to trigger the tube lights starter. At stating current I= maximum, therefore the voltage across the lighting will be maximum.
What is the working principle of a tube light?
Working Principle of Tubelight: When we power the tube light the whole voltage will go to the electronic ballast and to the starter of the tube light then it comes to the tube light side so, in the beginning, we will not get any kind of light from it.