Patent ID: 8362647

Claim:
An uninterruptible power supply (UPS) system, comprising: an AC input configured to be coupled to an AC power source; an AC output configured to be coupled to a load; a first power conversion circuit comprising a first converter circuit configured to receive power from a variably available power source, a second converter circuit coupled to the AC output, and a DC link coupling the first and second converter circuits; a second power conversion circuit comprising an AC/DC converter circuit coupled to the AC input, a DC/AC converter circuit coupled to the AC output and a DC link coupling the AC/DC converter circuit to the DC/AC converter circuit; a bypass circuit configured to selectively couple and decouple the AC input and the AC output; and a control circuit operatively associated with the first power conversion circuit, the second power conversion circuit and the bypass circuit and configured to cause concurrent transfer of power to a load at the AC output from the AC power source and the variably available power source via the bypass circuit and the first power conversion circuit, respectively.