| 摘要 |
PURPOSE:To reduce the number of parts and the power supply, by controlling a three-terminal IC regulator by a resistance-divided voltage in a series control type stabilized power source. CONSTITUTION:When a voltage V1 is lowered by DELTAV1 because of some cause, the voltage of a slider of a resistance R12 is lowered by rb/(ra+rb) .DELTAV, and the voltage of the output terminal of the first three-terminal regulator ICP is lowered by DELTAV1. The lowering of the output voltage is detected in an amplifier in the three-terminal regulator ICP by a differential voltage ra/(ra+rb) .DELTAV1 among them. Therefore, the input current of the three-terminal IC regulator ICP is increased, and the collector current of a transistor TRQ2 of a power controlling part is increased proportionally to increase the output current of a TRQ1 of the power controlling part, and the voltage V1 is raised to stabilize it. |
