| 摘要 |
PURPOSE:To reduce the base loss of a transistor inverter device by respectively connecting impedances between the bases and the emitters of oscillating transistors of the transistor inverter device, thereby forming a closed loop circuit of a feedback coil. CONSTITUTION:A full-wave rectifier Rel is connected through a constant-current choke CH to a leakage oscillation transformer OT having primary coils N1, N2, a feedback coil N3, a base drive coil N4 and a secondary coil N5 and an inverter having transistors Q1, Q2, thereby firing a discharge lamp LA. At this time impedances Z1, Z2 are respectively connected between the bases and the emitters of the transistors Q1, Q2 to form a closed loop circuit of a feedback coil N3, a current is flowed to the Z1, Z2, and the voltage of the coil N3 is dropped. Accordingly, a low voltage is applied to the base resistors R1, R2, thereby reducing the base loss. |
