The circuit is switched on, the starter to produce glow discharge, the U shaped bimetal sheet is heated and expanded and a static contact electrode contact, so that the filament, White LED driver starter, ballast and power to form a closed loop, the cathode electric preheating, emits electrons, preheating time is 1 ~ 3 seconds, the glow starter discharge quenching. This moment suddenly interrupted, current in a circuit, so that the ballast is generated at both ends of a power supply voltage higher than the induction electromotive force, LED semiconductor products at the same time with the power supply voltage is superimposed on the two ends of the tube, so that the two ends of the lamp tube electrode is formed between a strong electric field. Filament cathode emits electrons, in the role of strong electric field, causing a tube mercury vapour in the ionization and the formation of arc discharge, and produce large quantities of ultraviolet tube phosphor to emit visible light. At this time, the lamp current is in constant growth, rely on ballast impedance tube current limit and stability in the normal value. ( 20W lamp current is 0.37A, 40W for 0.43A )

Lamp starting, induction electromotive force disappears, is on the supply voltage and maintain Xenon flash lampthe normal work of the ballast lamp. A starter in the circuit only control lamp preheating current to the timing and disconnect circuit when the ballast to generate induced electromotive force action. In the fluorescent lamp to work normally, the starter is to stop working.

Inductive impedance type ballast effect:

Preheating filament, generates a lamp start need electric potential and limitation and stabilization of lamp current role.

Basic structure: in the copper wire winding coil is inserted in a silicon steel sheet.

Starter structure:

The starter is a consists of a glass tube made of a glow discharge tube with a small capacitor in parallel into ( no capacitor can also work ).

Glass tube made of glow discharge tube having a U shaped double metal sheets, a stationary contact electrode plate, called a static contact plate or a static contact pole, a glass tube filled with neon or argon, or neon argon or a mixture of inert gas. See work circuit diagram, when the circuit is switched on, a starter at both ends of the pole piece of electric breakdown, AB glue small knowledge inert gas and the conductive ( glow discharge process ), double metal sheet heating bending and a static contact plate connected to form a closed circuit. At this moment the current directly through the double metal piece and a static contact plate current, inert gas out of action without discharge, double sheet metal began to cool, after 1 to 8 seconds, the double metal sheet back to its original state, starter stop working. Therefore, online ups power starting time depends mainly on the bimetallic strip camber and bimetallic expansion characteristics. In general, the starter shall make the lamp in 8 seconds start work.