サークライン型蛍光灯の高周波点灯

Measurements are carried out on a comparison between high frequency lighting and normal lighting of a doughnut-type fluorescent lamp. A toroidal coil is installed around the lighting tube. High frequency power (13.65MHz, 30W) is supplied to the toroidal coil through an automatic matching circuit. Compared with normal lighting, almost same luminous intensity is obtained in the high frequency lighting, when the coil input impedance matches with the oscillator output impedance through the matching circuit