| 摘要 |
PURPOSE:To enable stable oscillation by feeding back the primary coil voltage of a step-up transformer, which occurs when a switching element shifts from ON to OFF, to the control pole of the switching element. CONSTITUTION:When a transistor 14 as the second switching element changes over from ON to OFF, the voltage by counter electromotive force, which has occurred in the primary coil 12P2 on the opposite side from the middle tap (a) of a step-up transformer 12, is fed back to the base of a transistor 13 through a capacitor 23 to change over the transistor 13 from OFF to ON. Moreover, when the transistor 13 as the first switching element changes over from ON to OFF, the voltage by counter electromotive force, which has occurred in the primary coil 12P1 on one side of the transformer 12, is fed back to the base of the transistor 14 through a capacitor 24 to change over the transistor 14 from OFF to ON. Hereby, the transistors 13 and 14 surely repeat ON alternately. |
