Patent ID: 8410638
Filing Date: 2013-04-02
Classification: H02J,Y02B,Y02E,Y02P

Abstract:
1. An uninterruptible power supply (UPS) system, comprising: an AC input configured to be coupled to an AC power source; a multiphase AC output configured to be coupled to a load; a rectifier configured to receive power from the AC input; an inverter having an output coupled to the AC output; a DC link coupling an output of the rectifier to an input of the inverter; a bypass circuit configured to selectively couple and decouple the AC input and the AC output; and a control circuit configured to cause the inverter to load a first phase at the AC output and transfer power to a second phase at the AC output to compensate for phase imbalance of a load coupled to the AC output when the AC input is coupled to the AC input by the bypass circuit.