APPARATUS FOR PROTECTING DC POWER SOURCE AGAINT DISTURBANCE DUE TO DISCONNECTION FROM POWER SOURCE OR CONNECTING ELECTRONIC SYSTEM TO DC POWER SOURCE

摘要

PURPOSE: To protect a DC power supply against trouble caused by connection with an electronic system or disconnection therefrom. CONSTITUTION: The unit 1 for protecting a DC power supply comprises at least one variable impedance component. Impedance of the component exhibits a very high first value when an electronic system is disconnected and a very low second value when the electronic system is connected. The impedance is controlled to vary slowly from the first value to the second value upon transition from disconnected state to connected state and to vary quickly from the second value to the first value upon transition from connected state to disconnected state. Output current from the variable impedance component constitutes the supply current of the electronic system.