| 摘要 |
PURPOSE:To exactly detect the voltage of a winding for detection and stabilize the output voltage at high precision, by connecting the emitter of a control transistor directly to the emitter of a switching transistor, and by connecting a condenser to a base. CONSTITUTION:For DC input 1, a transformer 3, a switching transistor Q1, and a resistance R2 are connected to a blocking oscillator, and a charging diode D2 and a condenser C2 are connected to a winding N4 for detection provided for the transformer 3. The voltage of the condenser C2 is fed to a control transistor Q2 via a constant voltage diode ZD. Besides, the emitter of the control transistor Q2 is connected to the connected point between the switching transistor Q1 and the resistance R2, and a condenser C4 is connected to a base. The ON-period of the switching transistor Q1 is controlled by the control transistor Q2. |
