Electronic ballasts by diodes, transistors , resistors, capacitors , inductors , and small size, light weight , saving copper and iron metal. magnetic ballast is made of silicon steel , wire composed of large bulky weight, simple structure , in a coil around the core above . Enameled copper wire .
Old-fashioned fluorescent at work , 220 VAC into
fluorescent ballast - Filament - jump bubble - Filament - then back to 220 volt power constitutes a loop inside the lamp filament heating power heated mercury vapor for about 2 seconds , while fever about 2 seconds after the jump bubble powered internal contacts open , then the circuit instantly disconnected. Since the ballast coil, when a sudden power failure will induce a high voltage, so that the inside of the mercury vapor lamp breakdown conduction, ultraviolet radiation generated in the phosphor coating inside of the tube above emit visible light.
After the lamp light , the voltage between two lamp foot sharply to about 60-100 volts, a sharp rise in current ballast ballast began to play a role , resulting in 140-160 volt drop in the ballast coil above limiting the lamp current to rise to stable 0.45 amps ( 40 watt lamp ) .
Light feet above two small metal cylinder is filament terminal, are interlinked.
After the lamp light , the current path is: 220 volts - Ballast - Lamp pin 1 - internal mercury vapor lamps - lamps pin 2 - 220 volt power constitutes a loop.
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