| 摘要 |
PURPOSE:To operate a self-oscillation circuit synchronously with the frequency of synchronizing pulses, by providing a starting pulse generation circuit and a stop circuit and by using the synchronizing pulse as a starting pulse when a load operates and the synchronizing pulse is produced. CONSTITUTION:The starting pulse generation circuit 5 produces starting pulses (d) on the basis of synchronizing pulses from a load 4. A transistor Q1 is turned on at t1, turned off at t2 and biased forward by the action of a resonance circuit N1, C1 at t3. In that case, the transistor Q1 is kept open by the stop circuit 6 which turns on another transistor Q5 for a period t2'-t3' determined by the capacitance of a capacitor C4. Since no voltage is produced across a base winding N3 at t3', the transistor Q1 is kept open further. When the starting pulse is generated at t4, the transistor Q1 is turned on. Such steps are repeated. As a result, the self-oscillation circuit can be operated synchronously with the frequency of synchronizing pulses. |
