Three-level t-type npc power converter
AssigneeOtis Elevator Company
InventorsIsmail Agirman, Steven M. Millett, Daryl J. Marvin, Shashank Krishnamurthy
Life of this patent
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Abstract
A three-level converter includes a first converter leg having first switches connected across a positive DC node and a negative DC node, a second converter leg having second switches connected across the positive DC node and the negative DC node, and a third converter leg having third switches connected across the positive DC node the negative DC node. The converter includes a battery connected between the positive DC node and the negative DC node, and center-connected to a ground node having a ground potential. Each of the first, second, and third converter legs is connected to the ground node.
Claims20
A three-level converter, comprising:
- a first converter leg having first switches connected across a positive DC node and a negative DC node;
- a second converter leg having second switches connected across the positive DC node and the negative DC node;
- a third converter leg having third switches connected across the positive DC node and the negative DC node;
- and
- a battery connected between the positive DC node and the negative DC node, and center-connected to a ground node having a ground potential, each of the first, second, and third converter legs connected to the ground node.
A power conversion system, comprising:
- an AC power device configured to perform one of receiving AC power to operate the AC power device or generating AC power;
- and
- a three-level converter connected to the AC power device, the three-level converter comprising:
- a first converter leg having first switches connected across a positive DC node and a negative DC node;
- a second converter leg having second switches connected across the positive DC node and the negative DC node;
- a third converter leg having third switches connected across the positive DC node and the negative DC node, the first, second, and third converter legs connected to the AC power device to perform one of providing AC power to the AC power device and receiving AC power from the AC power device;
- and
- a battery connected between the positive DC node and the negative DC node, and center-connected to a ground node having a ground potential, each of the first, second, and third converter legs connected to the ground node.
An elevator system, comprising:
- an elevator car;
- a motor configured to move the elevator car;
- a battery for supplying power to the motor;
- and
- a three-level converter electrically connected between the battery and the motor to convert DC power from the battery into AC power to run the motor, the three-level converter comprising:
- a first converter leg having first switches connected across a positive DC node and a negative DC node;
- a second converter leg having third switches connected across the positive DC node and the negative DC node;
- a third converter leg having third switches connected across the positive DC node and the negative DC node,
- wherein the battery is connected between the positive DC node and the negative DC node, and center-connected to a ground node having a ground potential, each of the first, second, and third converter legs connected to the ground node.
Dependencies are inferred from the claim text.