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What's the fluorescent lamp ballasts?
2015-07-08 07:58:44

When set up the power, the starter sheet metal is not closed, the mercury lamp was not excited, the lamp in a high impedance state, AC220V voltage applied to the ends of all metal piece starter, and starter in inert gas is ionized, produce glow discharge, heat generating glow discharge, resulting in double sheet metal deformation open closed bimetal closed starter in the lamp tube, the filament current through the filament, heating, filament cathode electronic Kai bimetal starter in the closed, there is no voltage at both ends, the inert gas stop glow discharge, stop heat, double metal sheet temperature decreases (note, the temperature increased the main reason is the double glow discharge, after the closure of the current through the metal sheet, will generate heat, but the heat, not enough to maintain the temperature), contact separation starter bimetal electric shock after the separation, due to a sudden power,the fluorescent ballast generate potential anti high, the counter electromotive force and power superposition applied at both ends of the lamp.

The electrons produced by the filament cathode are fast moving at high voltage by the low potential to the high potential. In the process of acceleration, the inert gas in the tube is rapidly ionized. Inert gas ionization heat, heat the mercury vapor, along with mercury vapor was ionized, and a strong ultraviolet radiation. In the ultraviolet ray through the fluorescent powder coated on the wall of the tube, a visible light is emitted. Different fluorescent powder can emit visible light with different colors if the inductance ballast generated EMF cannot successfully lit fluorescent lamps. The above process will be repeated, until to lighten the lamp or the filament damaged fluorescent lamp light, working voltage is about 110V, Kai Hui and fluorescent lamps are connected in parallel, equal voltage, voltage of 110V to ionization internal inert gas, will not be closed again. Inductance ballast through stable voltage, at both ends of the voltage of approximately 110. In the circuit has current limit / antihypertensive effect of 220V / 50Hz alternating current through a rectifying part variable to DC and DC power through the inverter unit variable 20kHz ~ 50KHz alternating current, an inductor L and a capacitor C form resonator resonant single element of the resonant frequency and inverter unit produces alternating current frequency the same capacitor C connected in parallel with the tube, the tube can be equivalent to a resistor R.

In the power of the moment, the lamp light, its resistance value is very large, R and C in parallel is equivalent to only C capacitor. So, l, C resonance, at both ends of the capacitor C produce high pressure, high voltage through the filament to form a loop, heating filament, filament cathode produced electronic, electronic under the action of pressure potential from low end to high potential end fast movement. In the process of acceleration, the inert gas in the tube is rapidly ionized. Inert gas ionization heat, heat the mercury vapor, along with mercury vapor was ionized, and a strong ultraviolet radiation. In the ultraviolet through coated on the tube wall of the fluorescent powder and emit visible light lamp light, the lamp tube equivalent resistance R decreases, R and C parallel equivalent to only the resistance R, so, LC series resonant circuit variable for the LR series circuit, resonant, l current limiting / antihypertensive effect, the lamp tube stable luminescence inductance ballast power factor is low, about about 0.4 ~ 0.6, resulting in large amounts of reactive power increases the lighting circuit current and transformer capacity, thereby greatly increasing the line and transformer losses, also increased the power loss, reduce the quality of lighting, also on the grid operation pose a threat to the fluorescent lamp ballast general power factor is not an electronic ballast inherent characteristics, but because of electronic ballast needed for harmonic suppression, the general use of active power filter and the harmonic suppression and reactive power compensation. If the inductance ballast uses the same technology to compensate, the same can achieve a high power factor. On the contrary, if the electronic ballast does not need to carry out the necessary reactive power compensation and harmonic suppression, because of the existence of the harmonic, the power factor can not be very high, and the harmonic pollution is far more than the core ballast.

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