Abstract: To allow multiple power line communication (PLC) devices to communicate with one another via power lines without being affected by the power supply state of an uninterruptible power supply unit coupled among the PLC devices. Multiple modem means 32 for transmitting or receiving a PLC signal are installed, each corresponding to a power receiving terminal 2 and one or more power supply terminals 3 in an uninterruptible power supply unit 1 in a one-to-one manner. Multiple low-pass filter circuit 7 and 18 for eliminating a PLC signal are installed to a power line between each of the multiple modem means 32 and a power supply circuit 10. Control means 40 and 41 transmit a PLC signal based on a PLC signal received by one of the multiple modem means 32 from at least one of the other modem means 32.

Abstract: An uninterruptible power supply and its load device are connected by a network, and the load device to which power is fed by the uninterruptible device properly executes shutdown processing. Communication means 49 of uninterruptible power supplies 2 and 3 communicate with a load device 4 to which they themselves feed power, via a network 5. UPS storage means 47 stores a waiting time until the load device 4 starts shutdown after it is notified of detection of power abnormality of an AC power supply 6. Notification means 48 causes the communication means 49 to provide notification of a remaining time until start of shutdown, in a time period until a time period corresponding to the waiting time (67) stored in the UPS storage means 47 elapses after power abnormality of the AC power source 6 is detected.

Abstract: There is provided an electric power supply system in which electric power is delivered from one electric power unit to load or the other electric power unit and can control and monitor the other electric power unit by one electric power unit. An electric source bus is built up by connecting an output line 5 of a DC-DC converter 2 to each of POL converters 6a, 6b, 6c. Loads 7a, 7b are connected to each of outputs of the POL converter 6a, 6b, 6c. An electric power unit 1 delivers electric power to the POL converters 6a, 6b, 6c by means of the DC-DC converter 2 and besides has functions to control and monitor statuses of the POL converters 6a, 6b, 6c. From a high-order system 10, a sequence program 20 and a monitoring program 21 can be rewritten which fulfill the functions of controlling and monitoring.

Abstract: A method and device for safety protection of a secondary battery capable of preventing smoking and ignition thereof. A lithium cell 1 as a chargeable and dischargeable secondary battery, a protection circuit 11 for shutting down charging power Pc at the time of overcurrent, overvoltage, etc., and an electric power restriction circuit 20 for limiting the charging power Pc input to the lithium cell 1 are incorporated into a battery pack 10. A battery charger 12, equipped with a stabilized electric source 13 and a charging circuit 14, inputting the charging power Pc to the lithium cell 1, is connected to a previous stage of the battery pack 10. The electric power restriction circuit 20 limits the charging power Pc within a boundary value Pmax of a safety operation region for safely using the lithium cell 1, thereby permitting the lithium cell 1 to operate safely under any conditions.

Abstract: A chargeable and dischargeable lithium cell and the filter unit capable of absorbing flammable materials are housed inside a casing. When an overvoltage is impressed from a battery charger to a battery pack and then internal gases inside the lithium cell are discharged out of an explosion-proof valve, the flammable materials included in internal gases are absorbed by the filter unit to change the internal gases into nonflammable gases. The internal gases purified by passing through the filter unit are exhausted from a gas-vent opening to the outside of the casing. By providing the filter unit inside the casing, the flammable materials discharged out of the lithium cell 1 can be prevented from leaking to the outside of the casing.

Abstract: The battery pack is made up by stacking vertically a plurality of electrically-series-connected flat-plate-like battery cells so as to attain a given voltage and a given capacity. Interlayer members are interposed between each battery cell stacked. The interlayer member functions as a surface pressure distributing member to thereby equalize surface pressures of the battery cells building up the battery pack, thus permitting the whole of the battery pack to lengthen in life span. Further, by employing, as the interlayer members, heat insulating members with heat insulating efficiency or heat dissipating members with excellent thermal conductivity, the battery cell located in a central position of the battery pack is prevented from shortening partially in life span, thus permitting the whole of the battery pack to lengthen in life span.

Abstract: Each of connection data 11, . . . , or 15, of the downstream side of a socket 1, . . . , or 5 or a panel board 6, 7, or 8 in a power supply direction, is generated in a tap 16, a UPS 25 and 35, or a terminal 24 or 34, and each of the connection data is transmitted to a electrical system wiring diagram generating terminal 36. Then, a wiring diagram is generated, based on connecting information 91 of the upstream side, which is registered in the generating terminal 36, and the plural connection data of the downstream sides.

Abstract: In a redundant configuration with multiple power sources connected in parallel to enhance reliability, a power source in which an overvoltage failure occurred has been difficult to identify and unable to be deactivated, which has impeded the improvement of reliability. However, it has become possible to deactivate selectively only the power source in which an overvoltage failure has occurred, by providing a independency-discrimination circuit that identifies the occurrence of the overvoltage failure by use of the state of a parallel operation control circuit, and connecting the independency-discrimination circuit, an overvoltage detection circuit, and a connection circuit.

Abstract: An Uninterrupted Power Supply (UPS) managing system is described for managing a plurality of small UPS devices, the small UPS device are connected to power supply routes between wall sockets and load devices. The UPS managing system comprises a plurality of lower controllers provided corresponding to each of small UPS devices or each of groups which is comprising at least two of said small UPS devices; a communication network for connecting a plurality of said lower controllers each other; and a higher controller connected to said communication network. In addition, each of said lower controllers generates connection information between each of its corresponding small UPS device(s) and each of load device(s) which is powered by said corresponding small UPS device(s), and transmits said connection information to said higher controller.

Abstract: An Uninterrupted Power Supply (UPS) managing system is described for managing a plurality of small UPS devices, the small UPS device are connected to power supply routes between wall sockets and load devices. The UPS managing system comprises a plurality of lower controllers provided corresponding to each of small UPS devices or each of groups which is comprising at least two of said small UPS devices; a communication network for connecting a plurality of said lower controllers each other; and a higher controller connected to said communication network. In addition, each of said lower controllers generates connection information between each of its corresponding small UPS device(s) and each of load device(s) which is powered by said corresponding small UPS device(s), and transmits said connection information to said higher controller.

Abstract: A resonant power converter includes a DC power source 1, a pair of MOS-PETs 1 and 2 which are connected in series to the DC power source, a transformer Tr1 which is arranged at the subsequent stage of the MOS-FETs 1 and 2 and includes a primary coil and a secondary coil, a capacitor C4 is arranged in parallel with the secondary coil of the transformer Tr1 so that series resonance occurs between the leakage inductance of the transformer Tr1 and the capacitor C4. A current doubler rectifier circuit may be arranged in the subsequent stage of the capacitor C4. Further, a pair of switching elements for synchronous rectification may be provided in the subsequent stage of the capacitor C4 so that these switching elements are driven by drive signals responsive to a voltage generated across the resonance capacitor C4.

Abstract: A resonant power converter includes a DC power source 1, a pair of MOS-FETs 1 and 2 which are connected in series to the DC power source, a transformer Tr1 which is arranged at the subsequent stage of the MOS-FETs 1 and 2 and includes a primary coil and a secondary coil, a capacitor C4 is arranged in parallel with the secondary coil of the transformer Tr1 so that series resonance occurs between the leakage inductance of the transformer Tr1 and the capacitor C4. A current doubler rectifier circuit may be arranged in the subsequent stage of the capacitor C4. Further, a pair of switching elements for synchronous rectification may be provided in the subsequent stage of the capacitor C4 so that these switching elements are driven by drive signals responsive to a voltage generated across the resonance capacitor C4.