Patent ID: 8723364
Filing Date: 2014-05-13
Classification: H02J

Abstract:
1. An uninterruptible power supply for receiving an input voltage and outputting an uninterruptible DC output voltage, said uninterruptible power supply comprising: an AC-to-DC converting circuit connected to a power supply output terminal and a common terminal for receiving said input voltage; an energy storage unit for storing electric energy; a first path-switching circuit connected to said power supply output terminal and said energy storage unit; a second path-switching circuit connected to said energy storage unit and said power supply output terminal; an integrated charge/discharge circuit having an input terminal and an output terminal respectively connected to said first path-switching circuit and said second path-switching circuit, thereby controlling a charging process or a discharging process of said energy storage unit; and an operating control unit, wherein if said input voltage is abnormal, said first path-switching circuit and said second path-switching circuit are controlled by said operating control unit to allow said input terminal and said output terminal of said integrated charge/discharge circuit to be respectively connected to said energy storage unit and said power supply output terminal, so that electric energy stored in said energy storage unit is transmitted to said power supply output terminal through said integrated charge/discharge circuit; and wherein if said input voltage is normal, said first path-switching circuit and said second path-switching circuit are controlled by said operating control unit to allow said input terminal and said output terminal of said integrated charge/discharge circuit to be respectively connected to said power supply output terminal and said energy storage unit, so that said energy storage unit is charged by said integrated charge/discharge circuit.