Abstract: A loss of a power source for a bus is detected. Responsive to detecting the loss of the power source, a voltage is generated on the bus using an uninterruptible power supply (UPS). A generator is transitioned to a desired output state concurrent with generating the voltage on the bus using the UPS. The generator is coupled to the bus responsive to the generator attaining the desired output state. The UPS may be used to provide power to a load connected to the bus while the generator is in transition. For example, detecting the loss of the power source may be preceded by operating a converter of the UPS coupled to the bus as a rectifier and generating the voltage on the bus using the UPS may include operating the converter of the UPS as an inverter.

Abstract: A power supply to provide multiple synchronous outputs includes a standby power system to receive input power and regulate to become standby power and a main power system to receive the input power and regulate to become main output power. The main power system has a rectification output unit to deliver the main output power. The power supply further has at least one delay trigger unit to receive the main output power and a voltage regulation output unit. The delay trigger unit sets a voltage judgment level and determines whether to output a trigger signal based on the main output power being greater or smaller than the voltage judgment level. The voltage regulation output unit can be activated by getting the standby power. According to the generation time series of the trigger signal, the time series to generate the secondary output power can be regulated.

Abstract: A lighting apparatus comprises a power unit, a fan unit, a charging unit, a light source unit and a control unit. The power unit receives power from an external power source. The fan unit is rotated using the power supplied from the power unit. The charging unit stores power generated from rotation of the fan unit. The light source unit generates light. The light source unit employs an LED as a light source. The control unit connects the light source unit to the charging unit when power level of the charging unit is greater than a specified level, and the control unit connects the light source unit to the power unit when the power level of the charging unit is lower than the specified level. Therefore, power consumed by the lighting apparatus is reduced and vibration resistance of the lighting apparatus is improved.

Abstract: A power emulating module within a powering system for a direct current air conditioner that utilizes solar cells array as a power source. The power emulating module enables to both convert the source signal from the solar cells array into the required voltage levels for the direct current motor of the air conditioner and further generate an alternating current control signal required for the motor control modules. In embodiments, the power emulating module is arranged to be retrofitted into an existing direct current air conditioner exhibiting a rectifying bridge, a motor power module and a motor control module, wherein the air conditioner is operable with an alternating current source. This is achieved by bypassing the rectifying bridge and routing the solar cells array via the power emulating module to the motor power module and further connecting power emulating module to the existing motor control module.

Abstract: A power supply device for powering equipment from at least one network supplying AC and at least one battery supplying DC, the power supply device comprising: a first branch that is connected to the main network and that comprises a transformation member for transforming the AC voltage into an equivalent DC voltage; a second branch that is connected to the battery and that comprises a voltage booster for raising the DC voltage supplied by the battery to an output voltage close to the DC voltage equivalent to the AC voltage; the first branch and the second branch being connected by a switch member to a converter arranged to transform the DC voltage equivalent to the AC voltage of the network into at least one DC voltage for powering the equipment.

Abstract: A power supply system includes an AC power line with an uninterruptible power supply (UPS) device coupled to receive power from the AC power line. The UPS includes control circuitry that couples power conversion circuitry of the UPS to the AC power line when the available AC power is acceptable. The power supply system also includes a second UPS device coupled to receive power from the AC power line. The second UPS includes a timer delay, such that the control circuitry is configured to couple power conversion circuitry to the AC power line when the available AC power is acceptable, and upon expiration of the timer.

Abstract: A control system is provided for controlling a load powered by an auxiliary power source during an interruption in the utility power source and/or during a power failure. The control system of the present invention provides power to essential loads in a dwelling as predetermined by a user and/or per the user's real-time instructions as the needs of the user may change. Additionally, the control system of the present invention automatically controls non-essential loads in order to maintain the auxiliary power load below the maximum threshold. Furthermore, the control system of the present invention allows the user to manually override all the controlled loads in an emergency or when the needs of the user change. Additionally, the control system of the present invention allows outside triggers to change the priority of the loads in real-time and can automatically change the priority due to predetermined tasks already running.

Abstract: A method in conjunction with an emergency light, and an emergency light with equipment comprising one or more LED light sources (52) for producing emergency lighting; a super capacitor (C1) arranged to supply one or more LED light sources (52), a charging apparatus (A) arranged to charge the super capacitor (C1) to a predetermined nominal voltage. The equipment of the emergency light further comprises means for deviating the charging voltage (U) produced by the charging apparatus; and means (C) for detecting the capacitor circuit voltage when the charging voltage is being deviated, the means (C) being arranged to detect a defect in the capacitor circuit in response to the voltage detection.

Abstract: A Fieldbus system comprising a plurality of segments each comprising a trunk with its own primary power supply, and a shared redundancy system comprising one or more auxiliary power supplies and monitoring and control means, in which the monitoring and control means is adapted to detect failures in any part of any of the plurality of segments, in which in the event of a failure being detected by the monitoring and control means in any one of the plurality of segments, the monitoring and control means isolates the trunk in that segment from its primary power supply and connects said trunk to one of the one or more auxiliary power supplies, and in which any one of the auxiliary power supplies is connectable to any two or more of the trunks.

Abstract: An alternative power source provides alternating current (AC) through a proper connector into a first outlet of a pre-existing electrical distribution system which is normally powered by an alternating current electrical power supply through main breakers and a breaker box. At least one of the breakers which controls power from the normal AC electrical power supply on the electrical distribution system is opened prior to connecting the alternative power supply. The alternative power supply provides electricity through the proper connector into the first outlet, or node, to provide alternating current to a selected portion of the electrical distribution system, and possibly to both halves of the pre-existing electrical distribution system if the proper connector is connected to a 240 volt outlet, or if two proper connectors are utilized and connected to first and second outlets with the first and second outlets on each of the two phase (power) wires of the pre-existing electrical distribution system.

Abstract: A plurality of power sources (26) supply power to a plurality of loads (24) via a distribution network (20, 22). Voltage is sensed at one or more points (28) in the network to provide a closed loop for regulating current or power supplied by the power sources, thereby allowing for voltage drops due to resistance of the distribution network. The loads may be low voltage integrated circuit devices on a printed circuit board (10), the distribution network may comprise power and ground planes of the board, and the power sources may be switch mode power converters on the board and providing regulated output currents.

Abstract: The present invention provides a system for selectively providing backup electrical power to a multi tenant facility like an apartment building or a multi-tenant cell phone tower. By placing a remote disconnect on each of the tenants meters the tenant can be selectively attached or disconnected from a backup power system as desired.

Abstract: A power supply system is provided that can operate with energy storage units of varying voltages and temperatures, that can correct voltage and temperature deviations, and that can continue to provide power when an energy storage unit is inoperable. A power supply system is also provided that can recondition an energy storage unit during vehicle operation.

Abstract: A power supply includes a rectifier that converts an alternating current input voltage to a first direct current voltage. An inverter that converts the first direct current voltage to an alternating current output voltage. A first set of output terminals that receives the alternating current output voltage. A second set of output terminals that receives the first direct current voltage. A charging circuit that charges a backup power source based on the first direct current voltage. The rectifier receives a second direct current voltage from the backup power source based on the power supply operating in a predetermined condition.

Abstract: According to one aspect of the invention, a UPS includes an input configured to be coupled to an AC power source, a DC power source, an output configured to receive power from at least one of the AC power source and the DC power source, a first switched receptacle outlet coupled to the output and configured to be coupled to a first electrical load and a second receptacle outlet coupled to the output and configured to be coupled to a second electrical load. According to some embodiments, the UPS also includes a control unit configurable to provide a first configuration associated with the first switched receptacle outlet, where the first configuration is employed by the control unit to control a connection of the first switched receptacle outlet to the output independent of the second receptacle outlet.

Abstract: In the case of an ignition system for a gas turbine engine, the power (P1, P2) intended for the two ignition units (1, 2) is supplied via a power supply bus (10, 14) each comprising a standard bus (11, 11?; 15, 15?) and an emergency bus (12, 12?; 16, 16?), and a relay (13, 17) connected to the respective power supply line to the corresponding ignition unit. In the event of failure of power supply in a supply line for power P1 or P2, the corresponding relay will automatically (mechanically) switch over to the respective other power supply line, thus ensuring that the function of the ignition unit is maintained, even if—for whatever reasons—power supply to one or the other ignition unit is interrupted.

Abstract: A system comprises a first power supply, a second power supply, and a load coupled to the first and second power supplies via separate power connectors. The load receives separate operating power from each of the first and second power supplies.

Abstract: A self-storage facility having a variety of differing facility components (that utilize electricity) can couple those components to an electric mains to provide operating power. Upon sensing a lack of electrical power to that electric mains, however, these teachings can provide for actuating a back-up generator to provide back-up electrical power for some or all of those components. These teachings will also accommodate, if desired, using a renewable electrical source to provide the aforementioned electrical power to a disparate grouping of facility components. These teachings will also further accommodate, as desired, providing a source of direct current electrical power (such as a 48 volt direct current electrical power source) and then coupling that source to this disparate grouping of facility components to provide their required electrical power.

Abstract: The power supply device of the present invention supplies power highly reliably by suppressing an increase in costs even when a multiplicity of load groups are present. When operating normally, each of the normal power supply units supplies power via a normal path to each of the load groups. One redundant power supply unit is provided for a plurality of normal power supply units. When any of the normal power supply units fail, the redundant power supply unit continues to supply power to the load group via the redundant path. A diode for connecting the redundant path to the normal path is provided in each normal power supply unit and the redundant paths that are routed through the respective normal power supply units are connected so as to intersect one another between the normal power supply units.

Abstract: The invention relates to an electrical emergency source device fitted on an aircraft, which comprises an energy source capable of outputting the power necessary for vital electrical loads (10) to operate correctly, wherein there are two types of these loads: first loads, that absorb a constant power with time, second loads, that absorb variable power with time. Wherein this device comprises: a power source (12) sized to output the average power absorbed by all loads, a power source (15) capable of supplying power peaks absorbed by the second loads, and wherein, since the power of several loads is reversible, the power of the said device is also reversible.

Abstract: There is provided a power supply for AC/DC and DC/DC conversion which receives the DC power supplied from airplanes, vehicles and vessels as well as normal AC power, and converts the power to DC power and supplies it to portable electronic products. The power supply for AC/DC and DC/DC conversion includes an AC input 10, a DC input 20, a switch 30 for selecting AC input power or DC input power, a DC output 40, and a circuit used for AC/DC and DC/DC conversion 100 which converts the power input from the AC input or the DC input to DC power having predetermined values of current and voltage, and a secondary side of a transformer (TL) for AC/DC conversion inside the circuit for conversion serves as an inductor for performing DC/DC conversion.

Abstract: An aircraft engine power distribution system for an aircraft engine controller, such as a FADEC, is provided where the power source is independent from the conventional airframe power system, without the need for a back-up battery. The aircraft engine power distribution system includes a magnetic generator operated by an aircraft engine. The aircraft engine power distribution system also includes a power distributor that rectifies the generator output and provides the rectified power to the engine controller as its primary source of power. In this configuration, as long as the aircraft engine is able to operate the magnetic generator, the engine controller receives power. Accordingly, the engine controller operates regardless of the operational status of the airframe power system.

Abstract: A power supply device for vehicles is disclosed, which device includes a backup unit to the power supply as an auxiliary power supply employing a capacitor unit formed of plural capacitors. The auxiliary power supply includes a power supply section allowing the capacitor unit to power an electronic controller, and a compulsory operating section for operating the power supply section. An operating status of the power supply section is monitored even when a battery operates normally, so that the power supply device for vehicles with higher reliability and improved safety is obtainable.

Abstract: The present disclosure provides a method and system using a power protector, such as an uninterruptible power supply (power protector) or a power line conditioner. An input of the power protector can be coupled to an output of one or more of circuit breakers using electrical buss bars for unique modularity and easy installation and replacement. Further, an input of a second set of circuit breakers can be coupled to an output of the power protector to backfeed the power through the second set of circuit breakers and out through the buss bar to one or more electrical loads. Additional power protectors can be used for capacity and/or redundancy. A stacked buss bar system can be used that consolidates the system into a compact assembly heretofore unknown in the industry. In at least some embodiments, the system can be compatible with standard panelboards having circuit breakers disposed therein.

Abstract: A system for powering and controlling electrical equipment of an aircraft engine or of its environment, includes at least one DC voltage power supply bus, a set of power supply modules associated with an electrical equipment group, each module including a voltage converter and a selector circuit inserted between the outputs from the modules of the set of modules and the pieces of equipment of the equipment group. The modules and the selector circuit are controlled to activate each piece of equipment of the equipment group by connecting it to at least one of the modules, with an emergency module being put into operation in the event of one of the other modules failing.

Abstract: A power over Ethernet controller supporting a plurality of powering modes, the power over Ethernet controller comprising: a pair of power sourcing equipments; and a control circuit; the control circuit being operative to control each of the pair of power sourcing equipment units in one of a first mode and a second mode, the first mode comprising operating the pair of power sourcing equipments as a single power sourcing equipment operable to power a single powered device over communication cabling, and the second mode comprising operating each of the power sourcing equipments of the pair independently so as to each be operable to power an associated powered device over communication cabling.

Abstract: An automatic transfer switch for a power system receiving multiple alternating current sources and delivering multiple alternating current output is described. A transfer switch control circuit can sense a power loss in one or both AC sources. Each power supply can deliver current to drive a load but, if one of the power supplies fails, the other can supply power to drive both loads.

Abstract: A method and apparatus for restoring power to loads connected to a feeder powered by a power source. The feeder is provided with a plurality of switching devices and a master electronic device which is in operative communication with the switching devices and has a plurality of power restoration plans stored therein. Upon occurrence of a fault in a zone of the feeder, the identity of the switching device which is closest to and upstream from the faulted zone relative to the power source is used in order to select a power restoration plan and restore power to some or all the loads connected to non-faulted zones of the feeder from one or more additional feeders.

Abstract: A power switching module provides power to a line amplifier in a broadband telecommunications network. The switch includes a first input port for connection to a first power source, a second input port for connection to a second power source, an input/output port for connection to a cable connecting the line amplifier with a remote amplifier, and an output port for connection to the line amplifier. A controller controls selection of the power source and provides power to the line amplifier from one the input ports and can provide power to, or receive power from, a power supply associated with the remote amplifier via the input/output port. A switch allows selection of a primary mode of operation or a secondary mode of operation. Another switch allows selection of a first operating voltage range or a second voltage operating range. A monitoring circuit communicates status information about the switching module to a remote location.

Abstract: The power supply device of the present invention supplies power individually to a plurality of disk drives by rendering a plurality of DC/DC converters redundant. One redundant power supply substrate is assigned to a plurality of normal power supply substrates. One redundant power supply substrate supports the outputs of a plurality of normal power supply substrates. The main DC/DC converters in the normal power supply substrate correspond with the subgroups on a one-for-one basis. The secondary DC/DC converters in the redundant power supply substrate each correspond with all of the respective subgroups and are able to supply power to a predetermined single disk drive among the respective disk drives in the subgroups for each of the subgroups.

Abstract: A power feeding system which includes an apparatus including a plurality of movable sections supplied with direct current power for operation; and a commercial power source and an auxiliary power source device for supplying electric power to the apparatus. The auxiliary power source device includes an AC/DC converter for converting alternating current power of the commercial power source into direct current power; a storage section for storing the direct current power outputted from the AC/DC converter; a power storage control section for discharging the direct current power stored in the storage means; and a power-feeding control section for supplying, to the movable sections, the direct current power outputted from the AC/DC converter or discharged from the storage section.

Abstract: An improved method and system for facilitating no-break power transfer between an APU and a main engine includes determining a required APU speed for conducting power transfer based on various APU operating parameters, such as engine speed, fuel, environmental temperature, etc. The APU controller then adjusts the APU speed up or down to the required APU speed. Communication between an aircraft computer and the APU controller may also be provided so that operational data can be exchanged to adjust the electrical load of the aircraft below a maximum load threshold set by the APU, avoiding overloading of the APU during power transfer. By exchanging operational data between the APU controller and the aircraft computer, both the APU and the electrical load can be adjusted to optimize no-break power transfer despite varying APU operating conditions and main engine generator frequencies.

Abstract: The invention relates to a system and a method for supplying power to an aircraft comprising several generators supplying alternating current to several different primary electrical master boxes (10, 11, 12 and 13), the various aircraft loads being connected to each of these master boxes. This system comprises conventional master boxes (10, 11, 12 and 13) which supply power loads and at least one master box (40, 41) devoted to actuator loads, this at least one devoted master box being connected to conventional master boxes.

Abstract: A power distribution device of a power storage apparatus comprises a power source and an uninterruptible power supply (UPS) system, wherein the UPS system has a built-in power output selector. An input terminal of the UPS system is connected to the power source. An output terminal of the UPS system is connected to several electric appliances via the built-in power output selector. As a result, no matter whether the power source supplies or not supplies the electric power, the built-in power output selector of the UPS system is able to supply the electric power to designated electric appliances according to the predetermined priority sequence and timing.

Abstract: A method and apparatuses are used for power conversion. The apparatus according to one embodiment comprises a plurality of power conversion modules (130—1, . . . 130—n), the plurality of power conversion modules (130—1, . . . , 130—n) being optionally controllable to function independently of each other to supply a plurality of systems (200—1, . . . , 200—n), function in an inter-relational mode in which at least one power conversion module from the plurality of power conversion modules (130—1, . . . , 130—n) drives a system and, upon a failure of the at least one power conversion module, at least another power conversion module from the plurality of power conversion modules (130—1, . . . , 130—n) will drive the system, and function in a scalable mode in which at least two power conversion modules of the plurality of power conversion modules (130—1, . . . , 130—n) are connected to provide an additive output.

Abstract: An isolated dual power source system for isolating a first power source of a vehicle, connected to an engine starter, from a second power source of the vehicle which has an electrical circuit for distributing electrical power among the consumers, includes first and second switches for selectively connecting the first and second power sources to the electrical circuit, respectively. The system may include a controller that independently and operatively connects to the first and second switches to control operation thereof for selective and respective isolation from the electrical circuit. A third switch connecting the second power source to the starter may be used to selectively provide power thereto and bypass the first power source to start the engine.

Abstract: A circuit arrangement, to which the vehicle electric system supply voltage is applied and which for briefly maintaining at least one internal normal d.c. voltage in the event of failure of the vehicle electric system supply voltage, includes a reserve energy accumulator, to which a charging voltage higher than the at least one internal normal d.c. voltage is applied in regular operation, and which, in the event of failure of the vehicle electric system supply voltage, delivers a reserve voltage with which operation of at least some electronic circuits may be maintained for a limited period of time, and it includes at least one step-down regulator which steps down the applied input direct voltage to the at least one internal normal d.c. voltage.

Abstract: A household self-contained power supply combined with, what a civil residence has equipped, a panel board, a mains power supply line, and a plurality of sockets. The panel board includes a plurality of breakers. The household self-contained power supply is composed of a power line network module, a battery unit, a control unit, an automatic changeover switch, and a plurality of adaptors. Each of the adaptors includes a sub-plug, at least one sub-socket, an electrically-controlled switch, and a sub-power-line network module. The mains power supply line is connected with the power line network module, such that the electrically-controlled switch can be controlled by the control unit to control the conduction status between the sub-plugs and the sub-sockets. Therefore, it provides a self-contained power source and self-management thereof.

Abstract: An Ethernet card (CL) is dedicated to the connection of a communication terminal (UE) to a local network via an Ethernet connection (CX). The terminal (UE) can be powered electrically by first power means (MAP), and includes a first internal bus (PCI1). The card (CL) includes i) second power means (MAA) capable of being powered remotely, via the Ethernet connection (CX), by power control means (PPP) on the local network, ii) a second bus (PCI2) coupled to the first internal bus (PCI1), iii) coupling means (MCP) coupled to the second bus (PCI2), and iv) control means (MCC) connected logically to the first (MAP) and second (MAA) power means and tasked, in the event of detection of remote powering of the card (CL) and the absence of electrical powering of the terminal (UE) by its first power means (MAP), to command the coupling means to electrically decouple the card from the first internal bus (PCI1), in order to allow its operation independently of the terminal (UE).

Abstract: A transfer switch is provided for transferring the supply of electrical power to a load between a utility source and a generator that generates electrical power when started. The transfer switch includes a transfer relay that selectively connects the load to one of the utility source and the generator in response to the application of electrical power on the coil of the transfer relay by the generator. A generator relay having a coil operatively connected to the utility source is also provided. The generator relay provides a signal to the generator to start in response to the absence of electrical power on the coil of the generator relay by the utility source.

Abstract: A power management device (200) and a method for use in a power distribution network (100) receives electrical energy and first determines if the power is a primary or secondary power source. When a secondary power source, the power management device (200) waits in standby mode, but when the power is primary power source the power management device (200) configures itself to route power to another node in the power distribution network (100). Power levels and faults within the network can be monitored and controlled by a central controller. Likewise loads (218, 220) may then be powered on as determined by a central controller to reduce LdI/dt voltage spikes and other undesirable side effects.

Abstract: A programmable uninterruptible power supply for coupling battery powered systems associated with a mobile site, such as a vehicle, to the primary electrical system of the mobile site operates to selectively couple the battery powered systems to the electrical system of the mobile site and to a secondary, or back-up battery separate from the primary battery associated with the electrical system of the mobile site. Various system control functions are performed, including reverse battery protection, over voltage and under voltage protection, battery drain protection, battery charging detection, reverse current detection and uninterruptible power switching. For detected adverse operating conditions, the load is disconnected from the electrical system of the mobile site and the back-up battery is used to operate the battery powered systems which are to be protected from such adverse operating conditions.

Abstract: The present invention is directed to an electrical system and method for providing power to a truck's cab while the truck's engine is turned off. An already available primary power supply of the truck and a secondary power supply generally located on a trailer being hauled by the truck, are used to charge auxiliary power storage units. The secondary power supply is further used to maintain charge of the auxiliary power storage units while the truck's engine is off. The system may provide power to electrical devices within the truck as DC, or as AC by means of an inverter. The system may further include thermostatic controls to protect the secondary power supply when high-voltage electrical devices such as space heaters are being used. Separate operating circuits are employed that include switching means to enable an operator to, or to automatically, control operation of the system.

Abstract: An uninterruptible power supply apparatus is equipped with a power supply input section a 2 and a power supply input section b 3 that receive two systems of power supply, respectively; a power supply output section a 4 and a power supply output section b 5 that output the power supply inputted in the power supply input section a 2 and the power supply input section b 3, respectively; and a control section 7 that detects a power failure state of the power supply that is inputted in at least of the power supply input section a 2 and the power supply input section b 3, and outputs a backup power supply from at least one of the power supply output section a 4 and the power supply output section b 5 based on a detection result obtained by the control section 7.

Abstract: The present invention is directed to a precise power system which utilizes two separate inverters fed by a rectifying power supply from a generator set. During normal operation, the first or critical inverter would feed the critical load(s) and the second or non-critical inverter would assist the electric utility in feeding the non-critical load(s). During utility grid failure, the second inverter is disconnected from the power supply so that the entire output of the generator set is available to the critical load. During generator set failure, the utility grid powers the second inverter to supply power to the first inverter for the critical load(s).

Abstract: A dual battery system includes a starter battery and a battery of the vehicle electric system, a starter and electric consumers that are divided up into start-relevant consumers and consumers of the vehicle electric system. At least one starter switch is interposed between the starter and the starter battery. A first, electronically fully locking switch element is interposed between the starter battery and the start-relevant consumers and a second electrically fully locking switch element is interposed between the battery of the vehicle electric system and the start-relevant consumers. An element is interposed between the starter battery and the battery of the vehicle electric system that prevents the flow of current from the starter battery to the battery of the vehicle electric system and the consumers of the vehicle electric system.

Abstract: The present invention provides an uninterruptible switching power supply device and a method for uninterruptibly switching from AC input power to DC power, in which a high voltage circuit connected with the primary winding of the main transformer and a lower voltage circuit connected with a tap from the secondary are controlled by a PWM to operate synchronically. When the AC input is normal, the AC input power is transformed the main transformer to power a load. When the voltage of the AC input is lower than the predetermined value, the battery begins to discharge for compensating the power of the AC input. When the AC input is interrupted, the discharge of battery is transformed by the transformer in a self-coupling mode to power the load. The voltage transformation efficiency is improved with the device and method of the invention.

Abstract: A system and method for distributing electrical power to an automated robotic device for transporting media cartridges in a data storage library. A power distributor includes multiple sections having first and second electrical conductors. A first power supply powers the first and second conductors of each section of the power distributor, and is connected to the first and second conductors of at least two section of the power distributor. A second power supply powers the first and second conductors of each section of the power distributor, and is connected to the first and second conductors of at least two sections of the power distributor. Power to each section of the power distributor is maintained in the event of a failure of one of the power supplies, and in the event of an electrical discontinuity in the power distributor.

Abstract: The present invention is a battery transfer circuit connected to a load, a power supply for powering the load with at least a minimum supply voltage during normal operating conditions, and a source of battery voltage for powering the load during a power fail condition when the power supply is unable to power said load at the minimum supply voltage. The battery transfer circuit comprises a first circuit for applying at least the minimum supply voltage to the load during normal operating conditions and a second circuit for charging the battery to an optimal voltage greater than the minimum supply voltage and for down-regulating the optimal charge voltage to a predetermined voltage and for applying the predetermined voltage to the load during the power fail condition, wherein the predetermined voltage is less than the minimum supply voltage.

Abstract: A switchgear system, as well as a method of controlling a switching status of two switches in a switchgear system, are disclosed. The switchgear system includes a first switch capable of electrically coupling a first power source and a load, and a second switch capable of electrically coupling a second power source and the load. The switchgear system further includes a control unit coupled to both the first and second switches. The control unit includes a memory that stores software, and the control unit is capable of operating in at least two modes and controlling opening and closing of the first and second switches in accordance with those modes based upon the software. The switchgear system additionally includes an operator interface coupled to the control unit. The operator interface is capable of receiving additional information that enables the operation of the control unit in at least one of the at least two modes.