| 摘要 |
PURPOSE:To reduce the output voltage during the lighting time by making the secondary side voltage of a single winding transformer in a specific condi tion to the lamp starting voltage in the filament preheating time and to the lamp voltage during the lighting time. CONSTITUTION:The secondary side output voltage V2 of a single winding trans former T to the primary side voltage V1 is made to the lamp starting voltage V20 in the filament preheating time, as 1.0<V20<1.8, and to the lamp voltage V1 during the lighting time, as 5.0>V2/V1>3.0, in the winding up of the secon dary side winding N2. As a result, the fluctuation width of the lamp starting voltage to the uneven constants of parts is reduced, the property to the fluctua tion of power source voltage is improved, and the output voltage during the lighting time can be reduced. |
