Abstract: A power interchange system for interchanging electric energy between a battery and an electric grid is provided The power interchange system includes a rectifier unit for converting alternating current of the electric grid into direct current for charging the battery; a grid measurement device for measuring an electric parameter of the electric grid, and a controller unit for adjusting the direct current for the charging the battery as a function of the electric parameter of the electric grid. Moreover a method for interchanging electric energy between a battery and an electric grid is provided.

Abstract: A Plug and Play adaptor for adding a PSU to a first PSU in a computer system. An ATX connector and a relay are contained in the adaptor. A second PSU can be added via the ATX connector in a plug-and-play manner, and the relay is energized and closes its circuit when it is powered by the first PSU and therefore turns on the second PSU through the ATX connector.

Abstract: An uninterruptible power supply (UPS) system includes an AC input configured to be coupled to an AC power source, an AC output configured to be coupled to a load and a power converter circuit coupled to the AC input and the AC output and configured to selectively provide power to the load from the AC power source and an auxiliary power source. The UPS system further includes a control circuit operatively coupled to the power converter circuit and configured to generate at least one galvanically isolated neutral reference from the AC power source and/or from the AC output and to control the power converter circuit responsive to the generated at least one neutral reference. In particular, the control circuit may be configured to generate the neutral reference from a three-wire AC connection.