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| Number | Title | Issue Date |
| 5381554 | Uninterrupted power supply (UPS) system interfacing with communications network There is a provided a system of one or more uninterrupted power supply (UPS) units, each UPS unit having distributed processing system and a network interface for interfacing with a local area network, the network providing a communication between the one... | 01/10/1995 |
| 5319571 | UPS system with improved network communications A system of one or more UPS units, each UPS unit having distributed processing apparatus and a network interface for interfacing with a local area network, the network providing a communication between the one or more UPS devices and also to loads powered... | 06/07/1994 |
| 5185536 | Uninterruptible power supply having improved battery charger An UPS apparatus with a back-up battery and successively coupled rectifier, inverter and output filter circuits, having an improved battery charging circuit. The charging circuit has a transformer with its primary winding being part of the output filter, ... | 02/09/1993 |
| 5117324 | UPS-computer system and method for initiating computer shutdown based on remaining battery time as determined from sensed battery voltage and discharge curves Method and apparatus for providing protected power to a computer. A computer monitors the terminal voltage and/or current of a battery supplying power to the computer and uses this information or data to determine when, in the event of failure of the AC u... | 05/26/1992 |
| 5057698 | Shunt circuit for reducing audible noise at low loading conditions of a power supply employing a high frequency resonant converter A power supply including a resonant converter is provided with current shunt. The current shunt automatically shunts a portion of current flowing in the resonant converter at light loading of the power supply such that output current flowing in an output ... | 10/15/1991 |
| 4980812 | Uninterrupted power supply system having improved power factor correction circuit An uninterrupted power supply (UPS) system is provided with a power factor correction circuit. The UPS system includes a rectifier having input terminals for connection to an AC utility power source and output terminals. The power factor correction circui... | 12/25/1990 |
| 4935861 | Uninterrupted power supply having no low frequency power magnetics An uninterrupted power supply (UPS) systems is provided comprising a rectifier circuit, an inverter circuit and a battery boost circuit. One of the input terminals of the rectifier circuit is for connection to the ungrounded conductor of an AC power sourc... | 06/19/1990 |
