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Emergency back-up power system for traction elevators

  • US 9,601,945 B2
  • Filed: 01/13/2014
  • Issued: 03/21/2017
  • Est. Priority Date: 01/29/2013
  • Status: Active Grant
First Claim
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1. A back-up power system for a traction elevator comprising:

  • a microprocessor-based control arrangement configured to recognize a loss of an input power supply, as well as irregularities in the power supply, including phase irregularities, the microprocessor-based control arrangement including a control module for generating both a control signal to remove the input power supply from the traction elevator, and a pulse-width modulated indicator signal;

    an inverter timing system operatively connected to receive the pulse-width modulated indicator signal from the microprocessor-based control arrangement;

    a back-up power generating means communicating with the inverter timing system, wherein the back-up power generating means generates an output to provide back-up power to the traction elevator, wherein the inverter timing system includes a job cycle lockout timer, which limits an amount of time that the back-up power generating means supplies output power and ensures operation of a full elevator cycle prior to returning to normal control power; and

    a main power lockout timer, which prevents simultaneous operation of the back-up power system and normal control power.

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