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

  • US 6,431,323 B2
  • Filed: 12/21/2000
  • Issued: 08/13/2002
  • Est. Priority Date: 12/28/1999
  • Status: Expired due to Fees
First Claim
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1. An elevator power management system, the system comprising:

  • a power storage apparatus;

    a converter for rectifying AC electric power from a power source into DC electric power for operating an elevator and for charging said power storage apparatus;

    an inverter for inverting DC electric power from said converter and from said power storage apparatus into AC electric power having a variable voltage and a variable frequency for driving the elevator;

    a motor driven by the AC electric power to operate the elevator; and

    charge/discharge control means coupled to said converter, said inverter, and said power storage apparatus for controlling charging and discharging of said power storage apparatus based upon a charge target value of said power storage apparatus, stored in said charge/discharge control means, and that varies with time of day.

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