US 11,539,303 B2 · Uninterruptible power supply and method of operation

Abstract

An uninterruptible power supply (UPS) is provided that includes a split direct current (DC) link having a first capacitor coupled between a positive DC link terminal and a first node, and a second capacitor coupled between the first node and a negative DC link terminal. The UPS also includes a rectifier coupled to an input of the split DC link and a controller coupled to the rectifier. The rectifier includes first, second, and third legs, wherein each leg is configured to convert a first alternating current (AC) voltage received from an AC source into a DC voltage to be provided to the split DC link, and a fourth leg configured to balance DC link voltages of the first and second capacitors. The controller is configured to maintain functionality of the rectifier during at least one of a partial utility power outage, a full utility outage, and a failure of at least one of the first, second, third, and fourth legs.

Claims20

Dependent claims

An uninterruptible power supply (UPS) comprising:

a split direct current (DC) link comprising a first capacitor coupled between a positive DC link terminal and a first node, and a second capacitor coupled between the first node and a negative DC link terminal;
a rectifier coupled to an input of the split DC link, the rectifier comprising:
a first leg, a second leg, and a third leg, each leg of the first, second, and third legs configured to convert an input alternating current (AC) voltage received from an AC source into a DC voltage to be provided to the split DC link through a pair of antiparallel switches electrically coupling the respective leg to the input of the split DC link;
and
a fourth leg configured to balance DC link voltages of the first and second capacitors;
and
a controller coupled to the rectifier and configured to adjust at least one operating parameter of the rectifier to operate the rectifier to perform voltage balancing during a failure of the fourth leg, while utility power is present and while utility power is not present.

4 more elements

A method of operating an uninterruptible power supply (UPS), the method comprising:

converting an alternating current (AC) voltage received from an AC source into a direct current (DC) voltage to be provided to a split DC link, the AC voltage converted using at least one of a first leg, a second leg, and a third leg of a rectifier coupled to an input of the split DC link;
balancing DC link voltages of first and second capacitors of the split DC link using a fourth leg of the rectifier, wherein the first capacitor is coupled between a positive DC link terminal and a first node, and wherein the second capacitor is coupled between the first node and a negative DC link terminal;
adjusting, by a controller coupled to the rectifier, at least one operating parameter of the rectifier to perform voltage balancing, with the rectifier, during a failure of the fourth leg, while utility power is present and while utility power is not present;
and
adjusting, by the controller coupled to the rectifier, the at least one operating parameter of the rectifier to perform voltage balancing with two of the legs of the rectifier during a single phase power outage.

2 more elements

Dependencies are inferred from the claim text.

Uninterruptible power supply and method of operation

Life of this patent

Uninterruptible power supply and method of operation

Life of this patent

Abstract

Claims20