Emergency Back-Up Power System For Traction Elevators

• US 20170149275A1
• Filed: 02/08/2017
• Published: 05/25/2017
• Est. Priority Date: 01/29/2013
• Status: Active Grant

• Current Assignee: Reynolds & Reynolds Electronics, Inc.
• Original Assignee: Reynolds & Reynolds Electronics, Inc.
• Inventors: Hall, James C.
• Granted Patent: US 10,432,020 B2
• Time in Patent Office: Days
• CPC Class Codes: B66B 11/04 Driving gear ; Details thereof, e.g. seals braking devices acting on the driving gear B66B5/02; of mining-hoist winding devices B66B15/08
• CPC Class Codes: B66B 5/027 to permit passengers to leave an elevator car in case of failure, e.g. moving the car to a reference floor or unlocking the door
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: Y02B 50/00 Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies

Abstract

An emergency power supply for a traction elevator system utilizes a microprocessor-based control arrangement with pulse-width modulator technology to create an efficient, cost-effective back-up power system for a traction elevator. The microprocessor-based control arrangement is used to sense a power loss, or any type of irregularity in the power supply. Upon sensing some type of power malfunction, the microprocessor-based control arrangement disconnects the elevator system from the main power source and then generates a control signal to initiate the supply of back-up power. Once the elevator electrical system has been recharged and stabilized, the elevator control system will sense that recovery has occurred and will then provide an appropriate speed and direction command to the traction motor drive system.

Claims

1. A back-up power system for supplying an emergency power source to a traction elevator comprising:

a source of DC input power;

a control arrangement configured to recognize irregularities in the power supply and subsequently generate a control signal to remove the input power supply from the traction elevator, the control arrangement further operable to generate a power control signal;

a back-up power generating means coupled to the source of DC input power and responsive to the power control signal for converting the DC input power signal into the emergency power for the traction elevator, wherein the generating means sequentially switches the DC input power through a transistor arrangement to produce a set of separate sine waves, with the power control signal used to control the energy transfer from the DC power source to the output sine waves.

2. The back-up power system as defined in claim 1 wherein the emergency power is three-phase emergency power, using a set of three separate sine waves.

3. The back-up power system as defined in claim 1 wherein the emergency power is single-phase emergency power, using a set of two separate sine waves.

4. The back-up power system as defined in claim 1 wherein the back-up power generating means provides a control signal to create and maintain a correct phasing of the output sine waves.

5. The back-up power system as defined in claim 1 wherein the source of DC input power is selected from the group consisting of:

battery, super capacitor, or a combination thereof.

6. The back-up power system as defined in claim 1 wherein the back-up power continues until one of the following conditions is recognized:

a fault occurs, normal power returns, completion of a rescue sequence as indicated by the elevator controller.