Elevator power management system having power storage apparatus maintaining a particular charge in accordance with time of day

Patent 6431323 Issued on August 13, 2002. Estimated Expiration Date:

December 21, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Elevator power source device
Patent #: 5058710
Issued on: 10/22/1991
Inventor: Iwasa

Method and system for electricity storage and discharge
Patent #: 5184058
Issued on: 02/02/1993
Inventor: Hesse, et al.

5548200

Inventors

Assignee

The Tokyo Electric Power Company, Incorporated

Application

No. 741159 filed on 12/21/2000

US Classes:

187/290, With auxiliary supply of electricity187/296Limited to power source (i.e., motor) utilizing A.C. power

Examiners

Primary: Salata, Jonathan

Attorney, Agent or Firm

Leydig, Voit & Mayer, Ltd.

Foreign Patent References

5-338947 JP. 12/13/1993
11-299275 JP. 10/13/1999

International Class

B66B 001/06

Foreign Application Priority Data

1999-12-28 JP

Abstract

To reduce total power required to drive an elevator by a commercial power supply during a peak power-consumption time period, for instance, an afternoon in summer time, a control apparatus includes a converter for rectifying AC electric power into DC electric power; an inverter for inverting the DC electric power into AC electric power having a variable voltage and a variable frequency; a motor driven by the AC electric power having the variable voltage and the variable frequency to operate an elevator; a power storage apparatus for storing electric power; and a charge/discharge control for controlling charging and discharging operation of the power storage apparatus based upon a charging target value.