About 37 results
https://drivepatents.com/patents/1013044 · 11 May 2011
The device (21) has switching units (UC1, UC2) for converting series of positive and negative alternating cut-off voltage (VA) into positive and negative direct voltage levels, respectively. The switching units are connected to a reference voltage line (5)...
https://drivepatents.com/patents/1015308 · 2 Mar 2011
A power-saving line interactive UPS has a power switch set (10), a low-frequency transformer (11), a full-bridge switching circuit (12), a main controller (13), a charge and discharge mode controller (14), a rechargeable battery (15) and a high-frequency c...
https://drivepatents.com/patents/1015634 · 23 Feb 2011
An uninterruptible power supply for providing power to a load, including a bypass input selectively coupled to the output to provide output power from a bypass power source, the uninterruptible power supply being arranged in a bypass mode of operation to c...
https://drivepatents.com/patents/1015980 · 9 Feb 2011
An uninterruptible power supply comprising an input, an output, a plurality of battery modules that provide backup power, a power circuit coupled to the input, the plurality of battery modules and the output to provide power derived from the input and/or t...
https://drivepatents.com/patents/1016317 · 26 Jan 2011
An uninterruptible power supply including a back-up power source, converter circuitry coupled to the output and to the backup power source to provide the output power from the input power and the backup power, a contactor having an open state and a closed ...
https://drivepatents.com/patents/1016502 · 19 Jan 2011
An uninterruptible power supply (UPS) system includes an AC power input configured to receive AC power from a single-phase AC power source or a multi-phase AC power source, a DC power source, an output circuit including a power output, a controllable switc...
https://drivepatents.com/patents/1071902 · 14 Dec 2005
Embodiments of the present invention are directed to an uninterruptible power supply for providing AC power to a load. In embodiments of the present invention, the uninterruptible power supply includes an input to receive AC power from an AC power source, ...
https://drivepatents.com/patents/1079648 · 2 Mar 2005
A power-converting apparatus, capable of holding an output AC voltage at a constant level when the variation in voltage input from an AC power-supply source remains within a predetermined range, comprises: a separating means (21) for electrically separatin...
https://drivepatents.com/patents/1082027 · 1 Dec 2004
The power supply has a DC power source (3) and parallel and serial converters (4,6) which are parallel connected between ends of an electrolytic capacitor (Cdc). The parallel and serial converters are actuated so that parallel converter current (Ipara) is ...
https://drivepatents.com/patents/1083427 · 6 Oct 2004
An uninterruptible power supply (UPS) system is provided which is adapted to prevent the output voltage from dropping due to an operation delay of a relay for isolating an AC power source side from the UPS system, and along with this, to avoid an unexpecte...