Patent ID: 7511389

Claim:
An emergency electric power supply unit for backing up a main electric power supply system at the time of the malfunction of the main electric power supply system comprising: an industrial apparatus operated by cooperatively controlling an auxiliary machinery operated by the electric power supplied from the main electric power supply system; an auxiliary electric power supply for storing the electric power; a charging circuit for charging the electric power supplied from the main electric power supply in the auxiliary electric power supply; a discharging circuit for supplying the electric power charged in the auxiliary electric power supply to the auxiliary machinery; and an emergency controlling circuit for controlling the discharging circuit so that the electric power from the auxiliary electric power supply is supplied to the auxiliary machinery at the time of the malfunction of the main electric power supply system, and for controlling the operation of the auxiliary machinery in response to the operational state of the industrial apparatus at the time of the malfunction of the main electric power supply system.