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Elevator system using a supercapacitor as a backup power source

  • US 7,331,426 B2
  • Filed: 12/26/2006
  • Issued: 02/19/2008
  • Est. Priority Date: 07/12/2004
  • Status: Active Grant
First Claim
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1. A method for storing electric energy needed in an elevator system and for supplying the elevator system with reserve power, comprising:

  • placing a supercapacitor in the electricity supply circuit of the elevator motor;

    pre-charging the supercapacitor with electric energy after start-up of the system;

    charging the supercapacitor with electric energy during substantially low energy consumption of the elevator by closing a charging switch; and

    discharging electric energy from the supercapacitor to the motor during substantially high energy consumption of the elevator or in the case of a failure of the electric power supply by closing a discharging switch;

    conducting the pre-charging current to the supercapacitor via a first switching branch consisting essentially of a series connection of a closed pre-charging switch and a resistor.

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