蛍光ランプ用共振型インバータ点灯での電極断線機構 : 蛍光ランプ電極の寿命時現象

概要

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Fluorescent lamp electrodes breakdown when the oxide on their coil electrodes is exhausted at the end-of-life. Two types of breakdown mechanisms are observed in oxide-less coil electrodes depending on the operation mode. When a lamp is operated continuously after ignition, breakdown occurs at the point where the coil electrode connects to its supporting lead after around 8 seconds. If the lamp is operated using cycles of 4 seconds on and 12 seconds off, breakdown will occur at the coiling part of the coil electrode after around 170 seconds. The experimental results show that the former breakdown mechanism is due to ion bombardment and the latter is due to the evaporation of tungsten wire. Discharge current concentration at the point connecting a coil electrode and its supporting lead, which causes the ion bombardment, will begin after 7 seconds or more, and is independent of the electrode temperature. Thus, if the operation of a lamp at the end-of-life stops within 6 seconds of starting by using a protection circuit, the breakdown due to ion bombardment will be prevented.
社団法人照明学会の論文
2005-11-01