SYSTEMS AND METHODS FOR IMPROVING EFFICIENCY OF A NEUTRAL-POINT-CLAMPED INVERTER

摘要

An uninterruptible power system described herein includes a first input and a second input and an AC output. The uninterruptible power system also includes power circuitry coupled to the first input, the second input, and the AC output, the power circuitry including an inverter having a first pair of switching elements including a first switching element and a second switching element and a second pair of switching elements including a third switching element and a fourth switching element, wherein the first switching element, the second switching element, the third switching element and the fourth switching element have an identical voltage rating; and a controller coupled to the second pair of switching elements and configured to control the third switching element and the fourth switching element to prevent occurrence of an overvoltage condition.

主权项

1. An uninterruptible power system comprising:
a first input configured to connect to a first power source; a second input configured to connect to a second power source; an AC output configured to provide output power derived from at least one of power at the first input and power at the second input, the AC output having a first output terminal and a second output terminal; power circuitry coupled to the first input, the second input, and the AC output, the power circuitry including an inverter having a first pair of switching elements including a first switching element and a second switching element, wherein the first switching element is coupled to a positive voltage rail and the second switching element is coupled to a negative voltage rail and a second pair of switching elements including a third switching element and a fourth switching element, wherein the third switching element is coupled to the first switching element and the fourth switching element is coupled to the second switching element, the third switching element and the fourth switching element also being coupled to the first output terminal, wherein the first switching element, the second switching element, the third switching element and the fourth switching element have an identical voltage rating; and a controller coupled to the second pair of switching elements and configured to control the third switching element and the fourth switching element to prevent occurrence of an overvoltage condition.