Working Principle for Fluorescent Light Starter

When the switch is turned on, the power supply voltage is applied to the fluorescent light starter immediately poles through the ballast and the lamp filament. 220 volts immediately inert gas ionization starter, the glow discharge. This process can be divided into two stages:
 
At first discharge stage
The process of heat bimetal thermal expansion, because of the different swelling degree of movement of the contact sheet, U-shaped movable contact sheet expansion elongation, and connected to the circuit in contact with the stationary contacts, so the contact poles ballast. Current path constituted by the ballast, fluorescent light starter contact electrode and the filament ends. In this case, since the starter poles closed, zero voltage between the two electrodes, launcher neon stop conducting, glow discharge disappear, resulting in a temperature drop tube, U-shaped movable contact piece cools and contracts, two separate contacts, the circuit automatically disconnect.

 
Instant ionization stage
In an instant the poles disconnected circuit current is suddenly cut off, ballast have a great self-induced emf, after the supply voltage is superimposed effect of the tube ends. Heat emitted from the filament when a large number of electrons at high voltage is applied across the lamp, with great speed from the low potential side to the high potential side movement. In the process of accelerated motion, the collision pipe argon molecules, so that rapid ionization. Argon ionization heat, heat the mercury vapor to produce, along with the mercury vapor is also ionized and emit intense ultraviolet radiation. Under ultraviolet excitation phosphors emit almost white wall inside the visible light. Fluorescent normal light after. Due to the continuous generation of alternating current through the self-induced emf ballast coil, coil, coil self-induced emf hinder change in current, then the ballast down from limiting the role of the current stability in the lamp rated current range inside, the voltage across the lamp is stabilized within the rated voltage range. Since this voltage is lower than starter ionization voltage (EMF), so in parallel across the starter no longer works and is automatically disconnected.