| 摘要 |
PURPOSE:To obtain a high voltage even without raising the step up ratio of a transformer by providing a control circuit for setting a timing when transistors are simultaneously turned ON. CONSTITUTION:A rectifier circuit 2 is connected to a commercial power source 1, transistors 4,5 which become a pair connected in push-pull manner with a constant-current choke 3 are connected to the circuit 2, and connected to the primary coil 7 of a transformer 6. A control circuit 9 is connected to the detecting coil 8 of the transformer 6, and the bases of the transistors 4,5 are connected to the circuit 9. A lamp 11 which becomes a load is connected to the filament coil 10 of the secondary side of the transformer 6. The circuit 9 obtains the operating state synchronized with an oscillation by a signal from the coil 8, and the transistors 4, 5 are simultaneously conducted by controlling the base current supplying timing to the transistors 4, 5, thereby producing the period for simultaneously conducting the two transistors. |
