FEATURES OF WORK OF LOW-POWERED LUMINESCENT LAMPS AT THE INCREASED FREQUENCIES IN THE REGULATION MODE

Abstract

Examines the work of low-power luminescent lamps in control mode the luminous flux to ensure the optimal modes of operation of the radiation source and the creation of conditions enhancing the functionality of lighting
systems, in particular ensuring their ability to generate normalized levels of illumination for various kinds of visual works.
The increase of luminous efficiency at a feed an increase frequency is interpreted due to reduction of losses of electricenergy in the anodic-cathode area of digit, and also by the change of properties of digit due to reduction of losses to power in the bit retort of lamp.
The fixed increase of effulgent brightness of digit in a bit lamp at the increase of frequency of feed of to 20 кHz (increase of exit of radiation of resonant lines of hydrargyrum was interlinked with a simultaneous supervision in the range of the 0,5 ÷ 20 кHz phenomenon of "expansion" of radial profile at′ capacious closeness of energy of resonant radiation in a digit on the average on 20 %. At the increase of frequency of to 20 кHz the increase of closeness of energy of resonant radiation was fixed near the wall of bit retort as a result of different term self-absorption spectral line radiation in plasma gas digit. Thus the brightness of radiation of digit increases due to the indicated effect of "expansion" of digit on the average on 20%.
Coming from the additional criterion of stability of light stream the optimal size of pressure of argon in a luminescent lamps was certain as 293 Pa. Thus coefficient of pulsation of light stream for such lamp by power 15 W
(current 0,4 А), tension on a lamp - 34 In at frequency of 18 кHz and 50 In at 50 кHz folds about 5. Was set that in more short luminescent lamps by power 15 W there is a greater increase of light efficiency (to 30 in increase frequencies comparatively with lamps 40 W, as a result of more considerable relative decline of tension on a lamp.
Where it follows from, that in mixture the hydrargyrum - argon of Un practically does not depend on frequency.
It is explained by that process where in a mercury digit flows ionising of plasma considerably quicker than change of network tension due to increase of speed ambipolar diffusion that is a dominant mechanism where
ionising of plasma digit of Low Pressure. As a result at the change of sign of the field tension the final ionising is practically absent. In previous works calculation of parameters to the contour of feed of luminescent lamps it is
recommended to carry out the current of an increase frequency by the method of basic accordion. However the real form of tension on a lamp not sine wave, but approaches three-cornered, that is why to the method of basic accordion inherent considerable errors especially considerable, if switching device that regulates a light stream and luminescent lamps work with the pauses of current. Exactness of calculations increases, if to present a lamp the equivalent generator of voltage of three-cornered form. Considerable, if switching device that regulates a light stream and luminescent lamps work with pauses of current