How does the ballast work?
1.3 ballast Ballast also called current limiter, choke coil, it is a big iron core coil self-induction coefficient. Its role has two: one is the fluorescent lamp startup it produces a high induction voltage, and power supply voltage superposition of the lamp lit; The second is to limit the current of the lamp when the lamp is working, to avoid the current too big and burn the filament. Working principle of the 2. Traditional fluorescent lighting circuit as shown, when switched on, due to the fluorescent lamp in high impedance state, the power supply after the ballast and the filament to the ends of the starter, neon bulb in the neon ionization, glow discharge, discharge heat deform the bimetallic strip is heated and through contacts, began to have current in circuit of two heating cathode fluorescent lamp, emitting a large number of electronic, mercury vapor to increase the tubes, complete the daylight lamp filament preheating.
1.2 starter Starter, the starter is also called by a neon, and a paper capacitors in parallel, neon light is a small glass bubble filled with neon, consists of a u-shaped double metal moving contact and a static contact pills comprise two electrodes. Bimetallic strip is composed of two different expansion coefficient of metal layers. When both ends of neon and voltage, neon glow discharge ionization, causes the bending of bimetallic strip is heated through two electrodes. After glow discharge has stopped, the bimetallic strip cooling, moving contact slice shape recovery, two contact apart again.
The working principle of inductance ballast is made up on Thursday, April 24th, 2008, 13:52 Fluorescent lamp inductance ballast system is mainly composed of lamp, ballast, starter of three main parts, the whole circuit has simple structure, lower cost, use more convenient. 1.1 fluorescent lamp Fluorescent lamp and fluorescent lamp, the body is a wall coated with a layer of phosphor material of glass tube, the tube is pumped into vacuum and filled with a small amount of inert gas, but also of liquid water injection trace silver. The glass tube ends each have one made of tungsten electrode, the above after coated with a layer of heat emission electron cathode materials. The basic principle of fluorescent lamp is current stimulate low pressure mercury vapor ionization and make them an ultraviolet, ultraviolet ray and stimulate phosphor emit visible light.
according to the type of lamp is different, the voltage at around 600 v to 1500 v range, after the superposition of induction voltage and the power source voltage on both ends of daylight lamp. Under the effect of the high voltage, the filament preheating emitted when a large number of electronic tube argon gas molecules, high-speed collision ionization quickly. Argon gas ionization heating, heat pipe mercury to produce steam, then mercury vapor were ionization and lead to an arc discharge, lambda = 253.7 nm wavelength ultraviolet (uv) light, bulb of the phosphor powder under the excitation of ultraviolet light, radiation out of the strong visible light, fluorescent tube into the normal working condition. Lamp lighting, the current in the circuit will be born in ballast larger voltage drop, at the ends of the tube voltage drops rapidly, making the starter and parallel tubes to stop working because of terminal voltage is too low. At this time of the ballast main limiting lamp current role, at the same time make the lamp current and voltage between 55 ° to 65 ° phase difference, thus maintain lamp secondary boot, the lamps can work more stable. The starter if not a start-up success of tube, the above process is repeated, until the lamp to start.
