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How does 55W fluorescent light ballast works?
2015-06-28 02:35:22

The working principle of 55W fluorescent light ballast as below:

Due to the gas discharge lamp, such as fluorescent lamps, neon lamp, metal halide lamp is a with the V-I characteristics of negative resistance of electric light source, is negative can be seen when the lamp current is increased, the working voltage of the lamp tube drop, but supply voltage will not be decreased more of this voltage applied to the lamp tube will make the lamp current rise further, so the cycle, eventually burned out lamp or lamp extinguished, so to make the lamp works normally, in the town of flow unit, to limit and stabilize the lamp current. This limiting device is called a ballast. At present, there are two kinds of ballast for gas discharge lamps. electronic ballast principle,the ballast circuit operating characteristic curve in the circuit, working voltage of the lamp and ballast components of voltage equal to the supply voltage, could eventually make the gas discharge lamp stable work. In the circuit, the lamp power can be pressed down:

P=IV a/ >

The alpha lamp luminous coefficient, tube and its working voltage and current, the inductance ballast, alpha can be 0.8, to high frequency electronic ballast, alpha can take 0.99 during stable lamp circuit, the lamp voltage is stable, so lamp power depends on the size of the lamp current, and the lamp current and the size of the town flow impedance of the element and a power supply voltage level about and frequency of power supply of fluorescent lamps work also have an impact. For example on the town of inductive flow, ballast inductance impedance ZL=2 PI FL, inductance ballast inductance and its winding number and core size, so when the power supply frequency is higher,flow inductor size will be smaller. This is the use of high frequency AC electronic ballast circuit, ballast inductance of the volume and size will be very small at present, the company has invested a great force for high-frequency AC electronic ballast of scientific research and production.

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