| Title |
Compensation of temperature characteristics by frequency control of an electronic ballastfor a compact fluorescent lamp |
| Authors |
송상빈(Song, Sang-Bin) ; 곽재영(Gwark, Jae-Young) ; 여인선(Yeo, In-Seon) |
| Keywords |
Electronic ballast ; CFL(Compact fluorescent lamp) ; Temperature compensation by frequency control ; Temper-ature characteristic of CFL |
| Abstract |
Compact fluorescent lamps are very sensitive to the variation of ambient temperature. This paper investigates the temperature characteristics of a 15[W] compact fluorescent lamp, and compensates the variation of light output by frequency control of its electronic ballast. Circuit parameters for the inverter of the electronic ballast are obtained by analyzing the R-L-C equivalent circuit for the inverter and the lamp. The optimum ratio of the two capacitance(C_1/C_2), which are connected with the lamp in series and in parallel, respectively, is determined which consideration of the temperature variation within a range of 10~35[°C]. As a result a value of 10 for the ratio is obtained at an operating frequency of 57[kHz], and with this value the frequency control works well for temperature compensation. Its validity is verified by investigating light output stabilization characteristics resulting from frequency control of the lamp at various temperatures. |