Abstract: An implantable pulse generator (106) provides electric stimulation pulses for nerve stimulation via a stimulation lead (100) having stimulation electrodes (102, 104). The electric stimulation pulses form a pulse train including (i) an initial selective-arrest phase for the large-diameter fibers in the vicinity of selected electrodes; (ii) followed by a charge-balanced phase where a charge-balanced alternating current (AC) is applied between the same or other selected electrodes; and (iii) a therapy phase where the charge-balanced alternating current (AC) is briefly unbalanced to deliver nerve stimulation therapy pulses, with the pulse train returning to the charge-balanced phase in between therapy pulses.

Abstract: The invention includes: charging/discharging devices including storage batteries and having a grid-connected function to perform charging/discharging operations on an electric power system and an islanded-operation function to supply the electric power system with a constant-voltage constant-frequency electric power; a monitor detects an electric power state of the charging/discharging device and to transmit detection output to the charging/discharging device; and a switching unit connects and disconnects commercial power source to and from electric power system. When a commercial power source is normal, the switching unit connects the commercial power source to the electric power system and charging/discharging devices establish a grid connection.

Abstract: Disclosed herein are methods and systems for monitoring and/or regulating energy storage devices. Examples of such monitoring and/or regulating include cell balancing, dynamic impedance control, breach detection and determination of state of charge of energy storage devices.

Abstract: A battery charger is disclosed for use with various batteries, such as automotive- and marine-type batteries. In accordance with an aspect of the invention, the charging current is alternated between non-zero DC charging current levels. By alternating the charging current between non-zero DC charging levels, the battery can be charged to a higher capacity (i.e., ampere hours) faster, thus reducing the charging time and at the same time allow the rating of the battery charger to be increased. In accordance with another important aspect of the invention, the technique for alternating the charging current can be implemented in both linear- and switched-mode battery chargers.

Abstract: A power loss protection integrated circuit includes a current switch circuit (eFuse), a VIN terminal, a VOUT terminal, a buck/boost controller, and a storage capacitor terminal STR. The controller is adapted to work: 1) as a boost to take a low voltage from the VOUT terminal and to output a larger charging voltage onto the STR terminal, or 2) as a buck to take a higher voltage from the STR terminal and to buck it down to a lower voltage required on the VOUT terminal. The current switch circuit outputs a digital undervoltage signal (UV) and a digital high current signal (HC). These signals are communicated on-chip to the controller. Asserting UV causes the converter to begin operating in the buck mode. Asserting HC prevents the converter from operating in the boost mode.

Abstract: An emergency lighting device for controlling a lighting means includes an energy store, such as a battery or an accumulator, a charging circuit for the energy store having connections for an AC voltage (alternating voltage), the charging circuit has a potential isolation element, a potentially isolated clocked converter supplied from the energy store and having a switch, preferably a flyback converter. The converter can be supplied only by the energy store, a control circuit for controlling the switch, and a supply path from the secondary side of the converter to connections for the lighting means.

Abstract: A system and method for controlling an on-board battery charger of an eco-friendly vehicle are provided. In the method, when instantaneous interruption of electric power occurs in an AC input power source, a DC-DC controller adjusts an output current instruction to be limited to the minimum charging power, and a power factor corrector (PFC) controller outputs a voltage instruction to a first capacitor (DC link capacitor) connected to an output terminal of the PFC controller to be updated to zero (0) or an actual value of the DC link capacitor. When the AC input power source is then restored, the PFC controller outputs the voltage instruction to the first capacitor to be increased to the existing voltage instruction with a predetermined slope, to smoothly perform the charging operation of the on-board battery charger without pause.

Abstract: A power source system for supplying DC (direct current) power to a load, including first and second power source apparatuses and a control apparatus. The first power source apparatus is connected to an alternating current (AC) power source, and configured to convert AC power received from the AC power source to first DC power. The second power source apparatus is connected to a battery, and configured to convert power of the battery to second DC power. The control apparatus is connected to the first and second power source apparatuses, and configured to so control the first and second power source apparatuses that the DC power supplied to the load is the first DC power in a normal mode, the second DC power in a back-up mode, and a combination of the first and second DC power in an assist mode.

Abstract: The cogeneration system includes: a cogeneration apparatus which generates electric power using supplied fuel gas and supplies the electric power and heat; a heat accumulator which accumulates the heat supplied by the cogeneration apparatus; a controller which controls at least start and stop of the cogeneration apparatus; and a display unit that displays a remaining power generation duration which is a length of time for which the cogeneration apparatus can continue power generation. The controller further calculates the remaining power generation duration based on a remaining heat accumulation capacity which is a difference between (a) a maximum accumulable heat amount which is the amount of heat the heat accumulator is capable of accumulating and (b) a current accumulated heat amount that is the amount of heat currently accumulated in the heat accumulator, and causes the display unit to display the calculated remaining power generation duration.

Abstract: Systems and methods of controlling an uninterruptible power supply are provided. In one aspect, an uninterruptible power supply includes a first input configured to receive input power from a first power source, a second input configured to receive input power from a second power source, an output configured to provide output power to a load derived from power from at least one of the first power source and the second power source, a power conversion circuit coupled with the first input, the second input and the output, and a controller coupled with the power conversion circuit. The controller is configured to control the power conversion circuit to provide an output voltage of the output power at a first voltage level, and to control the power conversion circuit to provide an output voltage of the output power at substantially a second voltage level.

Abstract: An uninterruptible power supply (UPS) system includes an AC output, an inverter coupled to the AC output and configured to provide power at the AC output, and a switch configured to selectively couple a generator (e.g., an engine-generator set) to the AC output. The system further includes a control circuit configured to variably modulate the switch to gradually increase control power flow from the generator to the AC output while causing the inverter to concurrently provide power to the AC output. The switch may be a static switch that includes at least one silicon controlled rectifier (SCR), and the control circuit may be configured to control a conduction interval of the at least one SCR to control power flow from the generator to the AC output.

Abstract: In some implementations, power provided to a computing system, such as a rack system, may be interrupted. This interruption is detected, and in response, power from a battery backup system is directed to the computing system to replace the interrupted power source, which in some implementations may be a main AC power grid source. A signal is received indicating that a backup power source, for example a backup generator system, is online and prepared to deliver power to the computing system. For an initial period of time, this backup power source is prevented from providing power to the computing system. For example, the backup generator system may be providing power to a power supply unit of the computing system, but the power is not allowed to flow to the computing system.

Abstract: A system for performing computing operations in a data center includes one or more sets of computer systems, one or more primary power systems, and a reserve power system. The primary power systems include a downstream portion that supplies power to at least one of the sets of computer systems. The reserve power system includes switches that switch between supplying a primary power feed and a reserve power feed from the reserve power system through part of the primary power system. An input resiliency switch can switch between supplying primary power or reserve power to support power supplied to the sets of computer systems through the primary power system based upon a primary power feed fault. A power distribution switch can switch between supplying primary power and reserve power to part of the downstream portion of the primary power system to bypass an upstream portion of the primary power system.

Abstract: A switching power supply device of the present disclosure includes a device connection state detection circuit that detects a connection state in a load device connection terminal, in a power supply system having the load device connection terminal. The device connection state detection circuit includes a transformer, a switching element, a pulse generator, and a waveform detection circuit. The waveform detection circuit detects a voltage or a current generated at a connecting point between a primary winding wire of the transformer and the switching element in response to operation of a pulse signal. The waveform detection circuit compares the voltage or the current with a predetermined reference value, and outputs an output signal in response to a comparison result to an OFF terminal.

Abstract: An electrical power converting device includes: a converter circuit part that includes a switching circuit and a transformer and converts a voltage between a voltage on a high voltage power source side and a voltage on a low voltage power source side in an unidirectional or bidirectional manner; a filter circuit part that is connected to a low-voltage side of the converter circuit part and includes an inductor and a capacitor; a control circuit board on which a control part is mounted, the control part controlling the switching circuit; and a metal housing in which an interior space of the housing is divided into a first accommodation space and a second accommodation space by a partition wall including a cooling liquid flow path, wherein the converter circuit part is arranged in the first accommodation space, and the filter circuit and the control circuit board are arranged in the second accommodation space.

Abstract: Example implementations relate to powering a keyboard using power received via a secondary coil. For example, an apparatus includes a support member to support a part of a portable computing device in a tilted orientation. The support member includes a secondary coil to receive power from a primary coil in the portable computing device. The apparatus also includes a base member connected to the support member. The base member includes a first wireless module to receive a first portion of the power from the secondary coil and to communicate with a second wireless module in the portable computing device. The base member also includes a keyboard to receive a second portion of the power from the secondary coil and to generate signals to transmit to the portable computing device via the first wireless module.

Abstract: An apparatus and method alternately transmit power from a first active power factor corrector (22, 122, 222), receiving power from a first alternating current (AC) source (27), and a second active power factor corrector (24, 124, 224), receiving power from a second AC source (28) having at least one line or neutral in common with the first AC power source (27) and in parallel with the first active power factor corrector (22, 122, 222), to a load (30). Current circulation from the first active power factor corrector (22, 122, 222) to the second active power factor corrector (24, 124, 224) and from the second active power factor corrector (24, 124, 224) to the first active power factor corrector (22, 122, 222) is inhibited.

Abstract: A battery monitoring and control integrated circuit is connected to a cell group having a plurality of series-connected single cells for monitoring and controlling the single cells, and includes: a first start input terminal for connecting to a DC signal generation circuit which generates a DC signal based on an AC start signal input from the outside; a start detection unit which detects the DC signal and activates the battery monitoring and control integrated circuit; and a start output unit which outputs the AC start signal to the outside after the activation of the battery monitoring and control integrated circuit.

Abstract: A power distribution system includes a bidirectional power converter, a battery, and a controller. The bidirectional power converter is operable to (i) convert AC power received at AC terminals to DC power at DC terminals and (ii) convert DC power received at the DC terminals to AC power at the AC terminals. The bidirectional power converter is disposed within a converter stack formed by a plurality of power converters having DC terminals that are coupled to each other in series. The battery is arranged to be selectively couplable to the DC terminals of the bidirectional power converter. The controller is configured to (i) determine that the DC voltage across the DC terminals of the bidirectional power converter is below a threshold voltage and (ii) couple the battery to the DC terminals of the bidirectional power converter based on the determination that the DC voltage is below the threshold voltage.

Abstract: An automatic switching interface box for generators in residential dwellings and small commercial applications provides a breaker box transfer switch for generators powering one or more electrical loads. In power blackout situations, the breaker box transfer switch uses a power control relay to keep the load power on, which eliminates the need for a hot generator plug, because the plug in box is not powered. The generator power output cord is plugged onto the male plug of the interface box, or hard wired thereto. If the auxiliary generator had been started and is at rated voltage, the load is immediately and automatically switched from the utility connection to the generator as electrical source. The relay keeps the prongs of the male plug safely unpowered until the generator is attached since the relay coil is powered by the generator output and the plug is connected to the normally open contacts.

Abstract: Embodiments of the present invention provide improved techniques and devices for reducing transformer commutation distortion caused by large load currents. Traditional power supplies which have two or more phases typically commutate a transformer during the end of each phase. When the load current is large, energy stored in the transformer's leakage inductance can cause undesirable effects during commutation. Embodiments of the present invention reduce these effects by lowering the voltage across the primary side of the transformer prior to commutation. In one embodiment, a capacitor is added to the primary side of the transformer. A switch directs current through the capacitor prior to commutation, allowing the capacitor to absorb the transformer's leakage inductance energy and lower the primary side voltage. Other suitable components, such as resistors, diodes, transistors, or additional transformer windings, may also be used to reduce the primary-side voltage prior to commutation.

Abstract: A multiple uninterruptible power supply system includes at least two uninterruptible power supply modules. Each uninterruptible power supply module has a control unit with the control unit coupled to a synchronization bus. The uninterruptible power supply module are synchronized to each other with one of the uninterruptible power supply modules being operated as a sync master UPS and its control unit sending synchronization signals on the synchronization bus that are received on the synchronization bus by control units of each of the other uninterruptible power supply module which are each operated as a slave UPS synchronized to the sync master UPS. When a bypass power source for the uninterruptible power supply module that is being operated as the sync master becomes unqualified, another one of the UPS modules is operated as the sync master and its control unit then sends out the synchronization signals.

Abstract: A voltage converter includes a voltage conversion circuit, a pulse width modulation (PWM) signal generating module, a feedback controlling module, and a subtractor. The voltage conversion circuit is configured to convert an input voltage to an output voltage according to a PWM signal. The PWM signal generating module is configured to generate the PWM signal according to a control signal. The feedback controlling module is configured to generate the control signal according to a feedback signal. The subtractor is configured to subtract a first reference voltage by the output voltage, to generate the feedback signal. The phase of an AC component of the first reference voltage is substantially opposite to the phase of the input voltage.

Abstract: An infusion pump assembly includes a reservoir assembly configured to contain an infusible fluid. A motor assembly is configured to act upon the reservoir assembly and dispense at least a portion of the infusible fluid contained within the reservoir assembly. Processing logic is configured to control the motor assembly. A primary power supply is configured to provide primary electrical energy to at least a portion of the processing logic. A backup power supply is configured to provide backup electrical energy to the at least a portion of the processing logic in the event that the primary power supply fails to provide the primary electrical energy to the at least a portion of the processing logic.

Abstract: An ECU includes a boosting circuit that boosts an input power supply voltage, a backup capacitor that charges a backup power supply in accordance with a boosted voltage boosted by the boosting circuit, an airbag ignition circuit that drives an airbag with the backup power supply charged by the backup capacitor as a driving power supply, and a bidirectional current limiting unit that limits a charging current flowing from the boosting circuit to the backup capacitor and limits a backflow current flowing from the backup capacitor to the boosting circuit.

Abstract: A lighting device includes a secondary LED lamp assembly, a secondary power source, a first switch connecting the secondary LED lamp assembly and the secondary power source upon an absence of power from an AC mains supply, and a secondary power source return circuit from the secondary LED lamp assembly through a pre-existing second switch connected to the AC mains supply and used to control the lighting device. A method of operating a lighting device includes connecting a secondary LED lamp assembly and a secondary power source upon an absence of power from an AC mains supply, and providing a secondary power source return circuit from the secondary LED lamp assembly through a pre-existing second switch connected to the AC mains supply and used to control the lighting device.

Abstract: An uninterruptible power supply (UPS) and methods of operation are provided. The UPS includes a transformer configured to receive power from a utility. The transformer includes a primary winding, a secondary winding, and a tertiary winding. The UPS also includes a rectifier coupled to the secondary winding and an inverter coupled to an output of the rectifier, wherein a connection between the rectifier and the inverter defines a DC link. The inverter is configured to output a first regulated voltage configured to be provided to a load. The UPS further includes a voltage-boost converter coupled to the tertiary winding and is configured to output a second regulated voltage to be combined with the first regulated voltage.

Abstract: An energy storage module for the reversible storage of electric energy is provided that comprises several flywheel energy storage units that are electrically connected in parallel via a shared DC link. A first regulation system is connected to the DC link and that, during normal operation (NO), connects the DC link to one or more external power networks in order to absorb (En) energy from or release (Ep) energy into the external power network(s). A second regulation system includes an input side and an output side, whereby the input side is connected to at least the DC link while the output side is connected to an internal supply network for purposes of supplying one or more electrically powered operating aggregates that are needed to operate the flywheel energy storage units.

Abstract: A power conditioner system includes a power-generation power conditioner 30 for connecting a power generation equipment 11 to a grid 12 and a power-storage power conditioner 50 for connecting a power storage equipment 13 to the grid 12, wherein the power conditioner 30 includes an independent-power-generation output unit 34 for outputting, separately from power supply to the grid 12, power based on power of the power generation equipment 11, and the power conditioner 50 includes an independent-power-storage output unit 54 for outputting, separately from power supply to the grid 12, power based on power in the power storage equipment 13. The power conditioner 50 supplies at least one of AC power based on the output of the independent-power-generation output unit 34, AC power based on the output of the independent-power-storage output unit 54, and system power of the grid 12, to an independent output system 62 having a predetermined load.

Abstract: There is provided a power supply switching circuit including a first control signal output unit that outputs a signal exceeding a predetermined potential using a main power supply as a first control signal when a power supply voltage of the main power supply exceeds a predetermined reference voltage, a second control signal output unit that outputs the signal exceeding the predetermined potential using a standby power supply from a battery as a second control signal when a potential of the first control signal does not exceed the predetermined potential, and a power supply output unit that outputs the main power supply when the first control signal exceeds the predetermined potential and outputs the standby power supply when the second control signal exceeds the predetermined potential.

Abstract: An uninterruptible power supply for providing an output power signal to a load has a ferroresonant transformer, a resonant capacitor operatively connected to the ferroresonant transformer, and an inverter operatively connected to the ferroresonant transformer. The inverter is configured to generate the output power signal based on at least one inverter control signal such that the output power signal is a quasi square wave having a first change of phase, an upper limit, and a second change of phase. The at least one inverter control signal is pulse-width modulated between the first change of phase and the upper limit, pulse-width modulated between the upper limit and the second change of phase, and held in an ON state when the output power signal is at the upper limit.

Abstract: A capacitive-based system that provides an electrical backup power source to an electric actuator for fail-safe actuation. The capacitive-based system includes an input power supply, a plurality of supercapacitors, and an output power supply. The input power supply converts an AC or DC primary power to a regulated DC output. The plurality of supercapacitors are connected in series to form a bank of supercapacitors. The bank of supercapacitors are operatively connected to the input power supply, are charged to a bank voltage set by the regulated DC output of the input power supply, and are used to store the electrical backup power source. The output power supply is operatively connected to the bank of supercapacitors, and boosts the bank voltage of the bank of supercapacitors to a higher DC output voltage, i.e., the electrical backup power source, that supplies the electric actuator.

Abstract: An adaptive power system includes an energy source, a bidirectional current source electrically connected between the energy source, and a power distribution bus of a power distribution system. The bidirectional current source delivers and absorbs power from the power distribution system to buffer a dynamic load profile of a dynamic load. The adaptive power system also includes a control loop and signal filter to control the bidirectional current source and regulate energy stored in the energy source.

Abstract: A computing device is associated with a circuit for sharing and distributing backup power. During normal operating conditions, a main bus bar provides power to each computing device in a rack via a main power bus of the corresponding circuit. In the event of an AC power outage, the main power bus is deactivated and a backup power path of the circuit is activated. Backup power is provided to the device from a battery of the circuit via the backup power path. A shared power path is also activated in the circuit such that backup power may be provided from the battery to the main bus bar. By providing backup power to the main bus bar, the other computing devices in the rack that do not have sufficient backup power may receive backup power from the main bus bar until AC power is restored.

Abstract: An uninterruptible power supply (UPS) includes a frame, at least one AC input supported by the frame and configured to be coupled to at least one external power source and at least one AC output supported by the frame and configured to be coupled to at least one external load. The UPS also includes a power conversion circuit supported by the frame and having an output coupled to the at least one AC output, the power conversion circuit configured to selectively provide power from first and second power sources. The UPS further includes first and second static switches supported by the frame and configured to couple and decouple the at least one AC input to and from the at least one AC output and a control circuit supported by the frame and configured to cooperatively control the power conversion circuit and the first and second static switches.

Abstract: A converter comprises a first switch, a second switch, a first blocking device and a second blocking device connected in series between two terminals of an output capacitor, an inductor coupled between a dc input source and a common node of the second switch and the first blocking device and a capacitor coupled between a common node of the first switch and the second switch, and a common node of the first blocking device and the second blocking device, wherein a voltage across the capacitor is configured to be adjustable through adjusting duty cycles of the first switch and the second switch.

Abstract: Disclosed herein are methods for detecting and correcting a fault induced delayed voltage recovery event in an electric power transmission and distribution system. In some embodiments, a fault detection subsystem may receive an indication of a fault in the electric power transmission and distribution system. The system may also include a load analysis subsystem to analyze a plurality of loads supplied by the electric power system and to generate an estimated response of the loads. A fault analysis subsystem may analyze a plurality of factors relating to the fault and to determine a probability of the fault generating a fault induced delayed voltage recovery event. A control system may then implement a control strategy within a control window following the fault based on the probability of the fault generating a fault induced delayed voltage recovery event and the estimated response of the at least one load.

Abstract: A robot includes a first power supply that outputs first voltage, a first circuit that operates with the first voltage, a second power supply that outputs second voltage, a second circuit that operates with the second voltage, and a first protection section that causes the first circuit to operate based on the second voltage when the first power supply stops outputting the first voltage.

Abstract: A controller is employed in conjunction with an electrical power distribution system (EPDS). The controller includes at least a first input for receiving DC power from a DC power bus and a power supply circuit connected to the first input to provide operational power to the controller. The controller further includes a power interrupt bridge circuit that monitors the voltage provided of the first input. In response to the monitored voltage being less than a threshold value, the power interrupt bridge circuit supplies power to the power supply circuit from a DC emergency source for a defined time period.

Abstract: A hot-pluggable uninterruptible power supply module includes at least one first power supply device, each first power supply device having an end electrically connected with an electronic system and another end electrically connected with an external AC power source; at least one hot-swapping uninterruptible power supply module, each hot-swapping uninterruptible power supply module including a control module, a second power supply device, and a battery that is electrically connected with the second power supply device. The second power supply device is electrically connected with the control module. The control module of each hot-swapping uninterruptible power supply module is electrically connected with each first power supply device. The second power supply device of each hot-swapping uninterruptible power supply module is electrically connected with the electronic system and an end of each first power supply device.

Abstract: A voltage supply apparatus includes: a primary cell; and a constant voltage supply unit. The constant voltage supply unit has set therein a voltage drop determination value, which is a threshold that is higher than a positional-data loss level and is lower than a second output voltage, which is a constant voltage at a steady voltage level that the constant voltage supply unit outputs when in a steady state. The constant voltage supply unit converts a first output voltage of the primary cell to the second output voltage and supplies it to the absolute-position detection apparatus until the first output voltage falls below the threshold. When the first output voltage falls below the threshold, the constant voltage supply unit converts the first output voltage to a third output voltage which is a voltage at the same level as the threshold, and supplies it to the absolute-position detection apparatus.

Abstract: A charging device includes a plurality of DC charging ports, a detecting circuit and a current output unit. The DC charging ports includes at least one first charging port and at least one second charging port. The output currents provided by the first charging port and the second charging port are lower than or equal to a first current limit and a second current limit, respectively. The detecting circuit is coupled to the DC charging ports to detect the output currents from the DC charging ports. When the current required by the first charging port is lower than the first current limit, the current output unit correspondingly supplies a requested current to the first charging port and distributes a surplus current to the second charging port. A total current limit of the DC charging ports is higher than a supply current limit.

Abstract: It is described a switching device comprising a semiconductor switching unit; a contactor electrically coupled in series with the semiconductor switching unit; and a controller being configured for activating an electrically isolating state of the switching device and/or activating an electrically conducting state of the switching device based on a command signal or based on a comparison of a measured value and predetermined activation condition.

Abstract: Novel system and methodology for adjusting a current limit threshold in a Power over Ethernet (PoE) system in accordance with requirements of a Powered Device (PD). A system for supplying power to a PD over a communications link has a requirement determining circuit for determining a PD's requirement, and a control circuit for setting a parameter restricting an output signal of the PSE in accordance with the determined PD's requirement. The control circuit may set a current limit threshold of the PSE and/or the PD in accordance with the determined PD's requirement, such as a power requirement.

Abstract: A load driving device including a converter, an output circuit and a timer circuit is provided. The converter receives a communication frame including a data signal through a serial communication and performs parallel conversion on the data signal to output an instruction signal instructing the output circuit to transition to a first state when the data signal includes first serial data and output an instruction signal instructing the output circuit to transition to a second state when the data signal includes second serial data. A timer circuit measures a duration time during which the converter receives the first serial data. When the measuring duration time arrives at an abnormality determination time, the timer circuit forces the output circuit to transition to the second state when the measuring duration time arrives at an abnormality determination time.

Abstract: A multi-port energy storage system includes a bi-directional power conversion circuit, a DC-AC inverter circuit, an electric energy storage facility, a first AC port, a second AC port and an AC switch. The multi-port energy storage system controllably provides various classifications of power supply quality via the first AC port and the second AC port.

Abstract: An electrocautery surgical device comprising a battery source and radio-frequency signal generating circuitry electrically coupled to the battery source and operable to deliver power.

Abstract: A method of adding a power feed to electrical systems includes coupling a set of input lines to a power source such that the input lines are connected to at least one phase of AC power from the power source, and coupling a set of backfeed lines to an output receptacle in a power distribution unit. The output receptacle may be connected in parallel with at least one other output receptacle that is supplying primary power to systems in the data center. The set of backfeed lines and the set of input lines may be tested to determine a match between a pair of lines in the set of backfeed lines and a pair of lines in the set of input lines. Determining the match may include matching the phase of the pair of backfeed lines with the phase of the pair of input lines.

Abstract: Various embodiments of the present technology provide methods for determining a status of power supplies to a server system and dynamically managing an uninterruptible power system (UPS) of the server system between an off-line mode and an on-line mode based upon the status of the power supplies. The UPS requires a minimum standby power during the off-line mode while requires no switch time to continuously supply power to loads of the server system during the on-line mode. Some embodiments determine a status of an AC input power to a server system and, in response to detecting an abnormal condition associated with the AC input power, generate a power warning signal. The power warning signal can cause an UPS of the server system to be switched from an off-line mode to an on-line mode.

Abstract: A system for providing a first voltage generated by a main supply and a second voltage generated by a battery to an integrated circuit (IC) includes supply-selection, control logic and switching circuits. The supply-selection circuit includes first, second, and third transistors. The switching circuit includes fourth and fifth transistors that supply the first and second voltages to the IC when switched on. The supply-selection circuit selects and provides the higher of the first and second voltages to body terminals of the fourth and fifth transistors for maintaining required body-bias voltage conditions. The control logic circuit generates a first control signal as long as the first voltage is within a predetermined range for keeping the fourth transistor switched on and a second control signal when the first voltage is not within the predetermined range for switching on the fifth transistor to supply the second voltage.