| 摘要 |
PURPOSE:To prevent a circuit from ill influence of a start trigger pulse and obtain a proper output voltage by interrupting the start trigger pulse required only at starting when the circuit is started. CONSTITUTION:When AC input power source is put to work, a positive voltage power source is applied to a terminal 10 and simultaneously a start trigger pulse is applied to a terminal 9. Since a switch of a relay 14 is turned to (a), the start trigger pulse turns on a switching output transistor (TR)15. After that, the TR 15 starts self-oscillation and the output of the TR15 is applied to a rectifier circuit 7 through a switching transformer 6 to be rectified and smoothed and outputted as DC output voltage from an output terminal 8. By the DC output voltage, a TR13 is turned on and the switch of the relay 14 is turned to the (b) side, interrupting the start trigger pulse. |
