Uninterruptible power supply, arc quenching device, electrical appliance and method for reducing an arc energy

An online, double-conversion uninterruptible power supply (UPS) 113 is disclosed, which comprises a UPS input 2 and a UPS output 5, a rectifier 3 and an inverter 4 in-between and a bypass switch 6 bypassing the rectifier 3 and the inverter 4. Furthermore, the UPS 113 comprises a control unit 7 for closing the bypass switch 6 in case of excessive output current and/or excessive voltage drop and/orexcessive power demand at the UPS output 5 and an override input 14 to inhibit closing the bypass switch 6. Optionally, when a fault arc A is detected, a signal may be sent from a fault arc detectiondevice 15a, 15b to the UPS 1b causing the bypass switch 6 to be held open. A combined power supply and arc quenching device and an electrical appliance 9b with such a UPS lb and a fault arc detectiondevice 15a, 15b is disclosed. 公开了一种在线双变换不间断电源(1b)，其包括UPS输入端(2)和UPS输出端(5)、位于两者之间的整流器(3)和逆变器(4)以及跨过整流器(3)和逆变器(4)的旁路开关(6)。进一步，UPS(1b)包括控制单元(7)，用于在UPS输出端(5)处的输出电流过大和/或电压降过大和/或功率需求过大的情况下闭合旁路开关(6)，和超控输入端(14)，以禁止闭合旁路开关(6)。当检测到故障电弧(A)时