| 摘要 |
PURPOSE:To make an input voltage at a load side constant at all times, by applying a base current of a transistor (TR) connected in series with a load to a constant voltage diode and changing the reference voltage corresponding to the fluctuation of a load current. CONSTITUTION:The reference voltage inputted to a differential amplifier DA is obtained by resistors R4 and R5, which are connected in series between the collector of the TR2 and the ground, and by the connecting point between resistors R4 and R5 corresponding to a Zener diode ZD. The reference voltage depends on the base current of a TR1, which is proportional to a load current of a constant voltage current, then the reference voltage is increased as the load current increases. Thus, a voltage V0 at an output terminal of the constant voltage circuit specified with the reference voltage depends on the load current. Even if the resistive component from the output terminal to the load of the constant voltage circuit is so large enough as not negligible, the voltage drop is compensated. |
