Elevator regenerative drive control referenced to DC bus

• US 9,296,589 B2
• Filed: 07/30/2010
• Issued: 03/29/2016
• Est. Priority Date: 07/30/2010
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Marvin, Daryl J.
• Primary Examiner(s): SALATA, ANTHONY J
• Application Number:
  US13/809,454
• Publication Number:
  US 20130112507A1
• Time in Patent Office: 2,069 Days
• Field of Search: 187/247, 187/277, 187/290, 187/293, 187/296, 187/297, 187/289, 187/391, 187/393, 318/376, 318801-815, 363/47, 363/50, 363/132
• US Class Current: 1/1
• CPC Class Codes: B66B 1/06 electric
• CPC Class Codes: B66B 1/302 for energy saving
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements

Abstract

An exemplary elevator drive includes a DC bus. At least some power components in a power section are electrically referenced to the DC bus. At least some control components in a control section including a drive controller and associated inputs are electrically referenced to the DC bus. This eliminates any requirement for isolating the components referenced to the DC bus from each other.

Claims

1. A regenerative elevator drive device, comprising:

a DC bus;

a power section having a plurality of power components electrically referenced to the DC bus; and

a control section having a plurality of control components including a drive controller and controller inputs electrically referenced to the DC bus,

wherein at least one of the controller inputs is coupled to a current sensing resistor in the power section so that the controller can determine a current of a corresponding component of the power section.

2. The device of claim 1, wherein the power components electrically referenced to the DC bus comprise a converter and an inverter and the control components electrically referenced to the DC bus comprise converter drivers and inverter drivers that are controlled by the drive controller, the converter drivers and inverter drivers providing control signals to the converter and the inverter, respectively.

3. The device of claim 2, wherein the converter and the inverter each comprise a plurality of control switches referenced to the DC bus.

4. The device of claim 2, wherein the control components that are referenced to the DC bus comprise converter gate drivers and inverter gate drivers.

5. The device of claim 1, wherein the controller inputs comprise a plurality of analog inputs and a plurality of discrete inputs.

6. The device of claim 1, wherein at least some of the controller inputs are from one of the components of the power section that is referenced to the DC bus.

7. The device of claim 1, wherein at least one of the controller inputs is coupled to a voltage sensing resistor associated with the DC bus so that the controller can determine a voltage of the DC bus.

8. The device of claim 1, wherein other components of the control section are electrically referenced to ground and comprising optical isolators between some of the control section components that are referenced to ground and some of the components of the control section that are referenced to the DC bus.

9. The device of claim 1, comprising a plurality of shunt resistors associated with selected ones of the components of the power section, the shunt resistors providing current information to at least one of the components of the control section.