| 摘要 |
PURPOSE:To stabilize the output voltage of an oscillator by providing two condensers which determine a blocking oscillation and charging one through a switching element which turns ON in synchronization with a main transistor of a regulator. CONSTITUTION:Electric power is supplied from a blocking oscillator 1 to a control circuit 9, thereby controlling a switching regulator having a main transistor QM and a main transformer TM. Two condensers 107, 103 are provided in the oscillator 1, the condenser 107 is discharged through a transistor Q9, the condenser 103 is discharged through a transistor Q5 provided in series with a resistor 101, and the Q5 is turned ON in synchronization with a signal from another coil ns of the transformer TM of the main circuit. Accordingly, the period of the blocking oscillation is controlled with the signals of a main transistor QM upon variations in the input voltage or load, thereby stabilizing the controllability. |
