Importance

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Abstract

An interface between a main computer 20 and a peripheral unit 30 allows connection/disconnection of the peripheral unit to and from the main computer during the operation of the main computer, while achieving reduction of fluctuation in the source voltage caused by hot line connection/disconnection, as well as a reduction of the circuit size. The interface includes a connector having long terminal pairs and short terminal pairs, by which the peripheral unit 30 is connected to the main computer 20. The peripheral unit 30 contains a delay circuit comprised of a FET 10 for controlling ON/OFF operation of the electric current path, a capacitor C1, and resistors R1 and R2. The signal path containing R1 and R2 forms a closed loop only when the peripheral unit is completely inserted into the main computer. During the insertion, the long terminal pairs are first connected, which is followed by connection of the short terminal pair. After the connection of the short terminal pair, C1 is charged and the FET 10 is gradually switched ON. During the extraction of the peripheral unit, C1 starts being discharged after disconnection of the short terminal pair and the FET 10 is gradually turned OFF. As a result, electric current supply is varied smoothly.

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First Claim