BULB-SHAPED FLUORESCENT LAMP, DISCHARGE LAMP LIGHTING DEVICE AND ILLUMINATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a bulb-shaped fluorescent lamp, a discharge lamp lighting device, and an illumination device using the above, which can smoothly and stably control lighting without flicker even the light control phase is within 90 deg.. SOLUTION: The bulb-shaped fluorescent lamp comprises a fluorescent lamp 1, and a lighting circuit means composed of a noise filter NF, a rectifier circuit FBR, filter capacitors C1A, C1B, at least one switching means Q1, Q2, a switching frequency control means SFC, a load circuit LC, a lighting circuit member lighting the fluorescent lamp FL by high-frequency, a cover housing the lighting circuit member inside, and a base. The switching frequency control means SFC can be composed of an input voltage detecting member VDT, a detected voltage filtering means SM, and a conduction control member CCM which controls the effective electrostatic capacity of a resonant capacitor 7 by changing a conductivity corresponding to a smoothed voltage.