China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

When the switch is turned on, the power supply voltage is immediately added to the two poles of the starter through the fluorescent ballasts and lamp filament. 220 volts immediate starter inert gas ionization, generating a glow discharge. This process heat the bimetal thermal expansion, because the degree of expansion of the dynamic and static contact piece, U-shaped movable contact piece expansion elongation, in contact with the stationary contact piece turned circuit Then the ballast bipolar contact. Current through the ballast, a starter touch the pole and both ends of the filament path. In this case, since the starter poles closed, the poles of the voltage between zero and neon gas to stop conducting in launcher, glow discharge to disappear, leading to the decline of the temperature of the tube within the cooling shrinkage of the U-shaped movable contact piece, two of the contact plate separation, the circuit automatically disconnected. Poles disconnected moments circuit current is suddenly cut off, ballast generated a great deal of self-inductance electromotive force acting on the tube at both ends, superimposed with the power supply voltage. Out of the large number of electron emission of the filament when heated in the role of a high voltage across the lamp, with great speed by the low potential terminal to the high potential terminal movement. In the process of accelerating the movement of the collision argon gas molecules in the tube, so that rapid ionization. The argon ionization heat, heat the mercury to create steam, along with mercury vapor is ionized, and send a strong UV. Under ultraviolet excitation, the tube wall within the phosphors emit visible light of a nearly white. Fluorescent light after the normal luminous. AC constantly through the ballast coil, coil self-inductance electromotive force, self-inductance of the electromotive force to impede the current changes in the coil, then the fluorescent lamp ballast from the buck limiting the role of the rated current range, the current stability in the lamp within and across the lamp voltage stability in the rated working voltage range.