Principle of inductor ballast starter
Characteristics of the fluorescent lamp, lamp began to ignite need a high voltage, normal light allows only by small current, the voltage is lower than the voltage at the ends of the tube.
Electric fluorescent starter switch role in the circuit, it consists of a neon tube and a capacitance in parallel, and the role of the capacitor to eliminate the power supply of electromagnetic interference with ballast tank formation, and increase the voltage amplitude of the start pulse. An electrode in the discharge tube with double metal, use neon bulb discharge heating, make the bimetallic strip when open and close, inductance ballast current mutation on both ends of the tube and generate high voltage pulse.
When the fluorescent lamp after access circuit, electric fluorescent starter began to glow discharge between two electrodes, the bimetallic strip heat expansion and contact with the static contact extremely, so the power supply, ballast, filament and electric fluorescent starter constitute a closed loop, current filament preheating, 1-3 seconds when the heating time, electric fluorescent starter of glow discharge between two electrodes, then the bimetallic strip cooling and static contact is extremely disconnected, when two electrodes disconnect instantly, the current in the circuit suddenly disappeared, so ballast produces a high voltage pulse, and it has to do with power superposition, on both ends of the tube and, make the inert gas ionization inside the tube caused by arc discharge, in the process of normal light, ballast self-induction is still stable circuit in current role. By lenz's law, according to the direction of the induced current in the closed loop, always makes it inspired a magnetic field to hinder the cause of induced current magnetic flux changes. Despite the inductance coil is ballast resistance communication role, but according to working principle of the fluorescent lamp!
Now the inductive ballast is no longer in use or the electronic ballast
