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

High pressure sodium ballasts for lamps provide stable current use of the inductive reactance of the ballast, and other pipe lit work. Ballast for the lamp to provide a high starting voltage, lamp conduction. The use of a counter electromotive force of the ballast, with Lenz's law explanation is that acts in the moments before the other pipe lighting. Fluorescent lamp, in the initial stage of the ignited lamp requires a high-voltage pulse of more than 400V Once the lamp is ignited, maintaining normal working voltage of just about 60 ~ 90V, while the power supply is AC220V so required ballast and starter when the lighting to provide a high voltage pulse, to share a part of the voltage in normal operation by a ballast. Starter mainly by the bimetal, the small gap between the contact point, When the circuit is turned on, the supply voltage is sufficient to cause glow discharge through the gas filling. Slow heating of the contact piece opposite bending due to the different thermal expansion of the two metals, one or two seconds later, when the contact pieces touch together, i.e. through the ballast, and a filament forming a series circuit, so that a relatively strong A current (preheating current) of the filament is rapidly heated. After contact of the metal sheet, the glow discharge is extinguished, metal sheet i.e. start of cooling, the point of contact bounce, interrupts the series circuit, because it is hps ballasts high inductive circuit, so within 1ms, a high voltage pulse is generated between the two filaments of the lamp.