| 摘要 |
PURPOSE:To simplify a circuit by controlling a chopper controlled power source by the output of a flyback transformer, thereby maintaining the stability in the output of the transformer and eliminating a series regulator. CONSTITUTION:The variations in a load are detected by detecting resistors 16, 17, and compared by an error amplifier of transistors 26, 23, a control voltage is applied to a comparator 8 of a chopper controller, which compares it with a triangular voltage to alter the duty ratio of a switching transistor 2, thereby maintaining the output of a flyback transformer 13 constant. The input voltage of the transformer 13 is detected by detecting resistors 19, 20, and added to a transistor of an error amplifier 6. When the output of the transformer 13 is generated, a transistor 27 is turned ON, the voltage dividing point of the resistors 19, 20 decreases, and the transistor 22 is turned OFF. |
