Elevator system with regulated input power
First Claim
Patent Images
1. A device for managing power source variations in an elevator system, the device comprising:
- a transformer including a primary and a secondary, wherein power from a power source is received by the primary, and wherein an input of the elevator system is connected to the secondary;
a plurality of tap switches connected between the power source and the primary of the transformer, wherein each tap switch is connected to one of a plurality of tap points on the primary of the transformer; and
a controller that operates the tap switches based on a sensed voltage from the power source to provide power on the secondary within a tolerance band of the elevator system so that the elevator system continues operation during voltage sag or brownout conditions of the power source.
1 Assignment
0 Petitions
Accused Products
Abstract
A device (22) manages power source variations in an elevator system. The device includes a transformer (60) having a primary (62) and a secondary (64). An input of the elevator system is connected to the secondary (64). Tap switches (66a, 66b, 66c, 66d) are connected to the transformer (60) such that each tap switch is connected to a tap point (68a, 68b, 68c, 68d) on the transformer (60). A controller (54) operates the tap switches (66a, 66b, 66c, 66d) based on a sensed power source output to provide power on the secondary (64) within a tolerance band of the elevator system.
45 Citations
18 Claims
-
1. A device for managing power source variations in an elevator system, the device comprising:
-
a transformer including a primary and a secondary, wherein power from a power source is received by the primary, and wherein an input of the elevator system is connected to the secondary; a plurality of tap switches connected between the power source and the primary of the transformer, wherein each tap switch is connected to one of a plurality of tap points on the primary of the transformer; and a controller that operates the tap switches based on a sensed voltage from the power source to provide power on the secondary within a tolerance band of the elevator system so that the elevator system continues operation during voltage sag or brownout conditions of the power source. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for managing power source variations to provide regulated power to an elevator system, the method comprising:
-
monitoring a power source voltage received from a power utility; determining whether the power source voltage is within a tolerance band of the elevator system; and regulating the voltage provided to the elevator system in response to variations of the power source voltage from the tolerance band to maintain the voltage provided to the elevator system within the tolerance band and thereby allow continued operation of the elevator system using the power received from the power utility during periods when the power source voltage is below the tolerance band; wherein the power source is connected through a plurality of tap switches to a transformer primary winding and the elevator system is connected to a transformer secondary winding; wherein each tap switch is connected to one of a plurality of tap points on the transformer primary winding; and wherein regulating the voltage provided to the elevator system includes controlling the plurality of tap switches to adjust a connection of the power source to the transformer primary winding such that an output voltage provided on the secondary winding is within the tolerance band. - View Dependent Claims (9, 10, 11)
-
-
12. An elevator power system comprising:
-
a power source input for receiving power from a power utility; a transformer including a primary connected to the power source input and a secondary for supplying power to a load; a plurality of tap switches connected between the power source input and the primary of the transformer, wherein each tap switch is connected to one of a plurality of tap points on the primary of the transformer; and a controller that operates the tap switches based on a sensed voltage at the power source input to provide power from the secondary within a tolerance band of the load, so that the load continues operation during periods when the sensed voltage is below the tolerance band of the load. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
Specification