Why Fluorescent Light with Electronic Ballast does not need Starter?
You may notice when we use electronic ballast with fluorescent light, then the
fluorescent light does not need any starter but when we use electrical choke,
then the fluorescent light need a starter, but why? Most of the people say that
Electronic Ballast has Starter inside it but it is not true. If you check
inside the electronic ballast you will not find any starter inside it.
So the main reason is, electronic ballast can
automatically create a high voltage across the tube light at the starting time
to ionize the gas inside the tube light and automatically reduce the voltage
and current after the ionization of the gas. As the total operation is
automatic, so there is no requirement of Starter.
But, in case of electrical choke, the starter is
needed because at the starting time it shorted the circuit, so a high amount of
current flows through the electrical choke, therefore, a very high voltage is
applied across the tube light. After the ionization of the gas, the starter
opens the circuit, therefore the current through the electrical choke reduces
and the voltage across the tube light also reduces.
How Fluorescent Light Starter Works?
Actually, the Starter is used for short-circuit and
open-circuit. Let's understand with the help of the below diagram.
When we just ON the switch, the 230V voltage applied
across the tube light and the Starter through the electrical choke. As there is
a very small amount of neon gas inside the starter than the tube light, it
starts ionized. Once the gas inside the starter is ionized a current starts
flowing through the electrical choke and the starter.
The ionization of the gas inside the starter heats the
bimetallic strips, therefore the bimetallic strips touch each other and a short
circuit created, therefore a high amount of current flow through the electrical
choke and the starter.
As the high amount of current is flowing through the
electrical choke, it creates a very high voltage and it applied across the tube
light. This high voltage across the tube light ionized the gas inside it.
After the ionization of the gas, the current flow
reduces due to the voltage drop in the choke coil and the bimetallic strips
become cool and separates. Thus the circuit is opened and the voltage reduces
to the normal voltage.
So, now you may understand, here the function of the
choke coil is to produce high voltage and the function of Starter is to Short
and Open the circuit.
Electronic Ballast
The electronic ballast takes 230V at 50-60Hz AC
supply. First, it converts the AC to DC. After filtration of the DC, the DC
voltage is applied to the oscillation circuit. The oscillator circuit creates a
very high-frequency square wave output voltage.
This high-frequency signal is applied to the inductor.
As the frequency is very high, the changes in voltage also very high. Therefore
a very high voltage is produced according to the below equation,
This high voltage is applied across the tube light to
ionize the gas. After the ionization of the gas, the tube light starts to
conduct current and the voltage across the lamp reduces. The control circuit
inside the electronic ballast takes feedback from the output. So when the
ionization process is completed, the electronic ballast reduces the voltage and
current.
So, you may understand the electronic ballast creates
a high voltage and also does the ON, OFF itself.
- What is Electrical Choke, Why electric choke use in Fluorescent tube light
- [Explained] Electronic Ballast Circuit Diagram and Working
- Working of modern Led bulb with transformer less power supply.
- How Auto ON/OFF sensor light works?
Thank
you for visiting the website. keep visiting for more updates.
Why Fluorescent Light with Electronic Ballast does not need Starter?
Reviewed by manoranjan das
on
10:35 am
Rating:
