Patent ID: 6753622
Filing Date: 2004-06-22
Classification: H02J,H02M

Abstract:
An uninterruptible power supply (UPS) system, comprising:an AC input port configured to be connected to an AC power source; a DC input port configured to be connected to a DC power source; an output port configured to be directly connected to an AC load; a rectifier circuit coupled to the AC input port; and a power transfer control circuit coupled to the rectifier circuit, the DC input port and the output port, the power transfer control circuit operative to produce a DC voltage at the output port from a rectified voltage produced by the rectifier circuit in a first mode of operation and to produce a DC voltage at the output port from a DC voltage at the DC input port in a second mode of operation, the power transfer control circuit including: a current control circuit configured to be coupled between the output port and at least one of the rectifier circuit and the DC input port and operative to control a current from the at least one of the rectifier circuit and the DC input port responsive to a control input; and a switching circuit operative to couple and decouple the DC input port to and from the output port.