Patent ID: 8492928
Filing Date: 2013-07-23
Classification: H02J,H02M

Abstract:
1. In an uninterruptible power supply (UPS) system, a front-end converter comprising: a boost circuit having a single inductor coupled to the first input of the boost circuit; a first AC input and a neutral AC input together configured to receive alternating-current power; a battery having a negative port and a positive port; a first device coupled, disposed, and configured to selectively couple the single inductor to one of the first AC input or the positive port of the battery; a second device coupled, disposed, and configured to selectively couple the negative port of the battery to the second input of the boost circuit; a third device coupled to the anode of the first input diode and the cathode of the first input diode and configured to selectively bypass the first input diode; and a first controller coupled to the third device and configured to cause the third device to close to bypass the first input diode during an on-battery mode and to open during an online mode, wherein the single inductor is shared between the online mode of the converter and the on-battery mode of the converter and the battery is coupled through the single inductor to the first input of the boost circuit during the on-battery mode; and wherein the single inductor is an only inductor coupling the battery to the boost circuit.