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The working principle of the high pressure sodium lamp

The working principle of
After the start, when the light bulb produces arc between electrodes on both ends of the arc tube, due to the effect of high temperature of the arc inside the sodium amalgam of vaporized mercury vapor and sodium vapour, the launch of the electricity in the anode cathode movement process, the impact of discharge material atoms, make its produce ionization energy excitation, and then reply by the excited state to stable state;Or by the ionized state becomes excited, back to the base e infinite loops, excess energy in the form of radiation release, the light is produced.High discharge material vapour pressure of high pressure sodium lamp, which is the high density of sodium atoms and frequent collision between electron and between sodium atoms, the resonance radiation spectrum widening and other visible spectrum of radiation, so light color is better than that of low pressure sodium lamp high pressure sodium lamp.High pressure sodium lamp is a kind of high intensity gas discharge lamp.Due to the negative resistance characteristics of gas discharge lamp, if the light bulb from power grid to alone, its working condition is not stable, as the discharge process to continue, it will lead to circuit current unlimited increase, the last until light or zero, components in the circuit overcurrent destroyed.


V - Ann features
To work with other gas discharge lamp, high-pressure sodium lamp is arc discharge, v - Ann characteristic curve with negative slope, namely bulb current rise, and the lamp voltage is falling.Under the condition of constant power, in order to guarantee the stability of the light bulb, series circuits must be a positive resistance characteristic of circuit parts to balance the negative resistance characteristics of stable working current and the element called ballast or current limiter.Resistor, capacitor, electric sensors are limited flow effect.Resistive ballast is small, cheap, start the difficulty will happen with high pressure sodium lamp, work to a high heat resistance, needs to have larger heat dissipation space, power consumption is very big, will make the total lighting circuit efficiency decline.It usually used in the dc and the ac circuit used in the lights have obvious flicker phenomenon.Capacitive ballast, though not as resistive ballast itself consumed power is very big, low temperature rise, the power frequency is low, the capacitor charging, can produce pulse peak electric current, cause great damage to the electrode, flashing lights, affect the service life of the bulb;Working in high frequency circuit, voltage fluctuations can achieve ideal state, become the ideal ballast.Stable inductive ballast loss is small, impedance, antimicrobial resistance bias is small, long service life, the light bulb is better than the resistive ballast, the stability of the current with high pressure sodium lamp ballasts are based on the inductive ballast.Its disadvantage is benzene weight and price is on the high side.In addition, the electronic ballast is beginning to emerge, at present the price is expensive, reliability can not match the high-pressure sodium lamp, in addition to the special occasions to use, usually rarely used.So, high pressure sodium lamp must series corresponding ballast and bulb specification rear can use.High pressure sodium lamp lighting circuit is a nonlinear circuit, the power factor is lower, so consider compensation capacitors, on the Internet in order to improve the power factor of the network.

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