A DC bus balancer for use with four-level DC power including first, second, third, and fourth voltages (V+, V+/3, V-/3, V-), the circuit comprising: first, second, third, and fourth nodes (1310, 1311, 1313, 1314) configured to receive the four-level DC pow...

Aspects of the invention are directed to power distribution systems and methods for distributing power from a primary power source and a backup power source to a load. In one particular aspect, a power distribution system includes a first input to receive ...

Systems and methods for monitoring power in power distribution systems are provided. In one aspect, a system for monitoring power includes a power monitoring device that measures a value of at least one characteristic of power provided to a branch of a pow...

An uninterruptible power supply for providing power to a load, including a bypass input selectively coupled to the output to provide output power from a bypass power source, the uninterruptible power supply being arranged in a bypass mode of operation to c...

An uninterruptible power supply comprising an input, an output, a plurality of battery modules that provide backup power, a power circuit coupled to the input, the plurality of battery modules and the output to provide power derived from the input and/or t...

An uninterruptible power supply including a back-up power source, converter circuitry coupled to the output and to the backup power source to provide the output power from the input power and the backup power, a contactor having an open state and a closed ...

An uninterruptible power supply (UPS) system includes an AC power input configured to receive AC power from a single-phase AC power source or a multi-phase AC power source, a DC power source, an output circuit including a power output, a controllable switc...

Embodiments of the present invention are directed to an uninterruptible power supply for providing AC power to a load. In embodiments of the present invention, the uninterruptible power supply includes an input to receive AC power from an AC power source, ...