Abstract: Systems and methods of operating uninterruptible power supplies in parallel in a power distribution system to provide power to a load are provided. At least one uninterruptible power supply inverter provides power to the load. A communication interface provides a measured value of at least one of inverter output current of a first uninterruptible power supply and a measured value of the load current to a second uninterruptible power supply, and receives a measured value of at least one of inverter output current of the second uninterruptible power supply and the load current. A controller controls the uninterruptible power supplies to operate in one of a master state and a slave state.

Abstract: A switch circuit and method for converting a hard switch into a soft switch. In one example, the circuit includes a first switch having a first node and a second node, and a switch control circuit coupled in parallel with the first switch between the first and second nodes. The switch control circuit includes a series resonant circuit including a capacitor and an inductor coupled together in series, a second switch coupled in parallel with the series resonant circuit, a third switch coupled in series between the first node and the series resonant circuit, and a first diode coupled between the series resonant circuit and the second node, an negative terminal of the first diode being coupled to the second node.

Abstract: Systems and methods of operating uninterruptible power supplies in parallel in a power distribution system to provide power to a load are provided. At least one uninterruptible power supply inverter provides power to the load. A communication interface provides a measured value of at least one of inverter output current of a first uninterruptible power supply and a measured value of the load current to a second uninterruptible power supply, and receives a measured value of at least one of inverter output current of the second uninterruptible power supply and the load current. A controller controls the uninterruptible power supplies to operate in one of a master state and a slave state.

Abstract: A switch circuit and method for converting a hard switch into a soft switch. In one example, the circuit includes a first switch having a first node and a second node, and a switch control circuit coupled in parallel with the first switch between the first and second nodes. The switch control circuit includes a series resonant circuit including a capacitor and an inductor coupled together in series, a second switch coupled in parallel with the series resonant circuit, a third switch coupled in series between the first node and the series resonant circuit, and a first diode coupled between the series resonant circuit and the second node, an negative terminal of the first diode being coupled to the second node.