Patent ID: 6938733

Claim:
An emergency current supply equipment for a lift installation having an electric motor drive and a lift cage, the equipment comprising an electrical energy storage unit comprising super capacitors for bridging over temporary drops or interruptions in mains voltage for ensuring performance of an evacuation travel in the event of a failure at a mains supply during a lift travel by supplying energy to all electrical components of the lift installation which participate in the evacuation travel until such time as the lift cage has reached a level of a story; a frequency converter for regulating travel speed of the lift, the frequency converter having a direct voltage intermediate circuit; the electrical energy storage unit being coupled to the intermediate circuit such that the electrical energy storage unit is both charged by the intermediate circuit and the electrical energy storage unit supplies stored energy beck to the intermediate circuit as needed; and a power flow regulator is interposed between the intermediate circuit and the energy storage unit for controlling energy flow therebetween.