Back-up power system for a traction elevator

• US 20050006182A1
• Filed: 05/13/2004
• Published: 01/13/2005
• Est. Priority Date: 05/15/2003
• Status: Active Grant

• Current Assignee: Reynolds & Reynolds Electronics, Inc.
• Original Assignee: Reynolds & Reynolds Electronics, Inc.
• Inventors: Reinartz, J. Werner, Hall, James C.
• Granted Patent: US 7,275,622 B2
• Time in Patent Office: Days
• US Class Current: 187/290
• CPC Class Codes: B66B 5/02 responsive to abnormal operating conditions

Abstract

A back-up power system for a traction elevator is provided with a power sensing device to sense a power loss or irregularity of the normal control power; an inverter timing system connected to the power loss sensing device, where the inverter timing system receives a power sensing signal from the power sensing device; and a back-up power generating system communicating with the inverter timing system, where the back-up power generating system generates an output to provide back-up power to the elevator system.

Claims

1. A back-up power system for a traction elevator comprising:

a power sensing device, wherein the power loss sensing device senses a power irregularity of normal control power;

an inverter timing system operatively connected to the power loss sensing device, wherein the inverter timing system receives a power irregularity signal from the power loss sensing device; and

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.

2. The back-up power system of claim 1, wherein the back-up power generation means further comprises:

a dc battery power system;

a dc/dc converter operatively connected to the output of the dc battery power system; and

a three-phase generating means operatively connected to an output of the dc/dc converter, wherein the generating means generates an output consisting of a plurality of square wave outputs.

3. The back-up power system of claim 2, wherein the dc battery power system further comprises:

at least one dc battery; and

a battery charger system operatively connected to the batteries, wherein the charger system charges the dc battery under normal control power operation.

4. The back-up power system of claim 2, wherein the dc/dc converter further comprises:

a capacitor system to provide an ac current source to the converter;

a transformer, wherein a secondary of the transformer is operatively connected to a bridge rectifier and a low resistance capacitor bank to provide a dc voltage to the back-up generating means; and

an H-bridge configuration FET circuit to drive the transformer.

5. The back-up power system of claim 2, wherein the three-phase generating means further comprises at least one half bridge IGBT system, wherein the IGBT system provides a 120 degree phasing between any two square wave outputs.

6. The back-up power system of claim 1, wherein the power sensing device is a reverse phase relay.

7. The back-up power system of claim 1, wherein the inverter timing system further comprises:

a job cycle lockout timer, wherein the job cycle lockout timer limits an amount of time that the back-up power generating means supplies output power and allows operation of a full cycle prior to returning to normal control power; and

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