| 摘要 |
PURPOSE:To obtain a stable DC with a simple circuit configuration by producing the primary side exciting voltage of an oscillation transformer, and controlling so that the self-excited oscillation output of the transformer becomes a constant amplitude. CONSTITUTION:The primary side excited voltage of an oscillation transformer 3 is applied through resistors 14, 15 to a transistor 12. The terminal 13A of a reference power source 13 is connected with the emitter of a transistor 12, and the terminal 13B of the power source 13 is connected with diodes 15, 17. The diodes 16, 17 are respectively connected with the transformer 3 side of the resistors 14, 15 with the terminal 13B side as positive side. When the input voltage to the transistor 12 is larger than the voltage of the power source 13, it operates to reduce the base voltage of the transistor 11, thereby reducing the DC input voltage to the transformer 3. On the contrary, when the input voltage to the transistor 12 is smaller than the voltage of the power source 13, the DC input voltage to the transformer 3 can be increased. |
