Multiple input converter and an uninterruptible power supply including the same

A power converter comprising:

• a bridge arm unit and a bidirectional direct current (DC)-DC conversion unit, the bridge arm unit comprising an upper bridge arm and a lower bridge arm, an AC switch group, and a first DC switch group,
• wherein the bidirectional DC-DC conversion unit comprises a second DC switch group, wherein input ends of the bridge arm unit are selectably connected to an alternating current (AC) power by means of the AC switch group or to a rechargeable battery by means of the first DC switch group, an end of the bidirectional DC-DC conversion unit is connected to the rechargeable battery by means of the second DC switch group, and another end of the bidirectional DC-DC conversion unit and output ends of the bridge arm unit are connected in parallel to positive and negative DC buses;
• wherein the power converter is configured such that in a battery mode, the AC switch group is turned off and the first DC switch group is turned on, the input ends of the bridge arm unit are connected to the rechargeable battery, and the bridge arm unit converts and outputs a voltage across positive and negative electrodes of the rechargeable battery to the positive and negative DC buses;
• wherein when the second DC switch group is controlled to electrically connect the bidirectional DC-DC conversion unit to the rechargeable battery, the rechargeable battery discharges power via the bidirectional DC-DC conversion unit;
• and
• wherein when the second DC switch group is controlled to electrically isolate the bidirectional DC-DC conversion unit from the rechargeable battery, the bidirectional DC-DC conversion unit performs a bus voltage balancing process.