| 摘要 |
PURPOSE:To stabilize output voltage by generating positive and negative triangular waves by means of an oscillator, operating a transistor by the waves through impedance with feedback-controlling the output of the transistor. CONSTITUTION:Oscillating output is generated at the secondary side of a transformer T1 through the operation of the transistor Q1, and the positive triangular waves are generated by a resistor R4 and a capacitor C3 by the output and the negative triangular waves by a diode D3 and a capacitor C4. When the DC output voltage increases, a comparison circuit 3 detects the increase, flows base currents proportional to the transistor Q3 and lowers impedance, and the base potential of the transistor Q2 is brought close to negative potential and ON time is shortened. When the DC output voltage drops more than predetermined value, ON time is prolonged and the transistor is operated, and the output voltage is made constant. |
