When the switch is closed circuit of 220 v, 50 hz ac power, the electric current flows through the ballast, lamp filament to the starter filament heating (at the beginning of the starter is broken, due to exert a greater than 190 v ac voltage, the starter for the jump of gas inside the bubble arc discharge, the bimetallic strip heating deformation, two electrodes together, form a path to the filament heating), when the starter of the two electrodes together, since there is no arc discharge, bimetallic strip cooling, poles apart, due to the inductance ballasts are perceptual, when circuit suddenly, On both ends of the lamp will produce about 1 ms duration pulse voltage 600 v to 1500 v, the exact voltage value depends on the kind of light, in the case of discharge, the ends of the lamp voltage drop, immediately the lamp current limiting effect on the ballast on the one hand, on the other hand make the supply voltage and the working current of the lamp produces 55. By the year 65. To maintain the secondary start voltage of the lamp so that the lamp can work more stably.
Inductance ballast because of its simple structure, coordination as the first kind of fluorescent lamp ballasts, its market share is still relatively large, because of its low power factor, low voltage startup performance is poor, heavy energy consumption, stroboscopic, and many other shortcomings, its market is slowly being replaced by electronic ballast, the inductance ballast energy loss: 40 w (lamp power) + 10 w heat loss itself (ballast) is equal to the total power consumption of lamps and lanterns of a complete set of 50 w.
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