Abstract: The present invention discloses a backup power-supply system for emergency that may apply power to a data processing system and recover the information in it when the power supply is cut off or a power-supply connector is abruptly removed due to a careless user, so as to prevent the damage to the information the user is working on.When the power is applied to the system, a battery is charged with the direct current power applied from a linear conversion rectifier by a battery charger, and when the power is not applied to the system while a power switch is being turned on, a DC/DC converter is operated by a power controller to apply the DC power charged in the battery to the main power-supply system after the direct current has been converted into DC/DC power in such a manner that the main power-supply means applies to the system the power for recovering the information a user was working on in the system.

Abstract: The present invention discloses a power supply control system for the peripheral equipment of a computer which generates a signal for automatically cutting off the input power supplied to the peripheral equipment after a user has stop working on a computer for a predetermined period of time. Power to the peripheral equipment is then resumed when data is input to the computer system through an input. This system includes a first switching mechanism, an input-output sensing programmable array logic unit (PAL), internal-operation sensing programmable array logic unit, second switching mechanism, a counter and a controlling programmable array logic unit.