ONLINE INTERACTIVE UNINTERRUPTIBLE POWER SUPPLY AND CONTROL METHOD THEREFOR

摘要

An online interactive uninterruptible power supply comprises: an alternating current input end (20), an alternating current output end (30), a chargeable/dischargeable device (19), a DC/AC inverter (1), a rectifier circuit (14), a full-bridge inverter (5), a capacitor (C), a switching device (S), a charger (2), a boost circuit (16) and a rectifier buck circuit (15). The output end of the boost circuit is connected to the input end of the full-bridge inverter. The rectifier buck circuit is controlled to provide rectified output or rectified voltage-reduced output. The input end of the rectifier buck circuit is connected to the alternating current input end. The rectifier buck circuit is operable to provide a pulsating direct current to the boost circuit or the full-bridge inverter. The online interactive uninterruptible power supply can provide a stable alternating current to the alternating current output end and has small volume and low cost.