What is the function of choke in fluorescent tube?

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.

What is the purpose of choke?

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 role of condenser and choke used in fluorescent lamp?

The ballast controls the current flowing through the valve, and the condenser makes the ballast more efficient. The simplest ballast is a coil of wire. When electricity flows into the coil, it creates a magnetic field. The electricity that powers a fluorescent lamp is AC or alternating current.

What is the function of starter and choke in a fluorescent lamp setup?

Fluorescent starters or glow starters are used to help fluorescent tubes and lamps ignite in the initial starting stage of their operation. Simply put, fluorescent starters are a timed switch. The switch opens and closes until the fluorescent tube ‘strikes’ and lights-up.

What is difference between choke and transformer?

The difference is basically in usage. A choke uses the inductance as a primary characteristic to affect a signal. In a transformer the inductance is secondary and is just to establish the magnetizing current with the transformer’s primary purpose being to transform one signal level (or impedance) to another.

What is the function of choke ballast?

An inductor, usually a choke, is very common in line-frequency ballasts to provide the proper starting and operating electrical condition to power a fluorescent lamp, neon lamp, or HID lamp. (Because of the use of the inductor, such ballasts are usually called magnetic ballasts.)

What is difference between choke and inductor?

Inductors are metal coils used in circuits. They are able to generate magnetic fields when they carry current. Inductors that are used to help filter signals are called chokes.

What is the role of starter in fluorescent lamp?

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. Since the lighted fluorescent tube has a low resistance, the ballast now serves as a current limiter.

Is a common mode choke a transformer?

About Common Mode Choke Consider a common mode choke as a transformer with two or more windings with equal number of turns. If tightly coupled, the common mode choke provides a high impedance to the common mode interference while it is minimal in differential-mode signal paths.

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.

What is the function of choke coil in fluorescent tube light?

Impedance of choke increases with increase in frequency. Choke or coil is also used for RF filtering. The fluorescent lamp has two electrodes at its two ends but the voltage needed for breakdown is very high, much higher than the supply voltage.

Why do you need a choke in a lamp?

The purpose of a magnetic ballast or choke is to limit power flow through the lamp once it starts to produce light. The mercury vapor inside the lamp has a high resistance when cold (which is the need for the starter). But the mercury vapor becomes lower resistance as its temperature increases.

What is the function of a capacitor in a fluorescent light?

A capacitor is used to improve the power factor of the lamp.More detailsTo prevent the lamp from taking too much current a fluorescent lamp has to have a choke, which has magnetic inductance.

How does the starter work on a fluorescent lamp?

There are several different ways of starting lamps. For fluorescent lamps that briefly glow orange on the ends when they are turned on, the starter is completing a circuit to heat the ends of the tubes. A chemical coating on the heating filaments helps to start the lamp glowing.