The electronic ballast is composed of diodes, transistors, resistors, capacitors, inductors, small volume and light weight, saving copper iron metal materials.Magnetic ballast is made of silicon steel sheets, enamelled wire, volume weight, simple structure, winding a coil of the iron core. Enameled copper wire.
Traditional fluorescent fixtures at work, 220 volts alternating current into the ballast - filament bulb, filament - back to the 220 volt power supply circuit is composed of electric heating tube, the filament inside the mercury vapor for about 2 seconds, at the same time jump bulb electricity heating about 2 seconds after the internal contact open, then the circuit breaking instantly. The ballast is the inductance of the coil, when a sudden power failure induces a high voltage, the lamp inside the mercury vapor breakdown conduction, produce ultraviolet radiation in fluorescent powder coating on the inner wall of the tube, visible light.
The lamp light, the voltage between the two lamp foot sharply decreased to about 60-100 volts, current rises sharply, ballast, ballast began to play a role, pressure drop of 140-160 V in the ballast coil above, limit the lamp current rise, the 0.45 amperes (40 Watt lamp).
The lamp tubes, the current is: 220 volt - ballast - lamp foot 1-- lamp mercury vapor lamp foot inside -- 2--220 volt power supply circuit.
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