On the Voltage Allotments in Hot-Cathode Fluorescent-Lamp Circuits
| Autor: | Hirosuke Yamashita |
|---|---|
| Rok vydání: | 1953 |
| Předmět: | |
| Zdroj: | JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN. 37:208-212 |
| ISSN: | 2185-1506 0019-2341 |
| DOI: | 10.2150/jieij1917.37.208 |
| Popis: | It plays an important roll in the selection of fluorescent-lamps and their series ballasts to determine the voltage allotments in the hot-cathode fluorescent-lamp circuits. Problems are confined to the conventional low power factor lamp circuits, inductive ballasts in series. Lamps having several different arc gap lengths and outer diameters, and ballasts capable to vary their iron core sectional area and number of turns are used for following measurements.The effective values of sinusoidal line voltage, lamp terminal voltage and ballast impedance drop are designated as UN, UL, and UR respectively. Some relations, between these voltages were investigated by R. F. Hays and D. S. Gustin experimentally and H. Stranch theoretically, but these results cannot be applied satisfactorily to many actual cases.Combining several kinds of lamps and ballasts, following results are obtained in the wide range of lamp currents.UL+UR=(1.23±0.03)UN(3)By keeping a lamp current constant and varing the UR/UN values, nearly constant lamp voltage UL is obtained for large UR/UN value, except steep increase at a critical value of UR/UN. From these experiments, the next condition is derived.UR/UN>0.58±0.02(5)In accord with the variation of line voltage UN, the lamp current I varies following the lamp and ballast characteristics. Now the so-called current variation Re is defined by the next equationThe relation between UR/UN values and Re shows that Re increases steeply at a critical value of UR/UN. From these conditions, UL/UN |
| Databáze: | OpenAIRE |
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