Patent ID: 7649281
Filing Date: 2010-01-19
Classification: H02J,H02M,Y02B,Y04S

Abstract:
1. An uninterruptible power supply, comprising an input circuit connected to a voltage input terminal for receiving an input AC voltage and including a boost inductor configured to be charged by an AC current from the voltage input terminal so as to provide a boosted AC voltage; a battery; a rectifier circuit connected to an output terminal of the input circuit for converting the boosted AC voltage or a DC voltage outputted from the battery into an intermediate DC voltage, wherein the rectifier circuit comprises a transistor switch, the boost inductor of the input circuit is charged and discharged by repetitive switching operations of the transistor switch so as to provide the boosted AC voltage, and the rectifier circuit further comprises a choke coil to limit the change rate of the output current of the battery and a battery monitor which is implemented by a Hall effect current sensor connected in series between the choke coil and the battery for detecting a change on an output current of the battery; and an inverter circuit connected to an output terminal of the rectifier circuit for converting the intermediate DC voltage into an output AC voltage.