Abstract: A method for restoring power based on forecasted loads is described. The method includes identifying at least one zone within a power distribution network and predicting an energy demand of the at least one zone. The method also includes identifying at least one alternate source of power for the at least one zone, identifying at least one switch within the power distribution network capable of supplying power from the at least one alternate source to the at least one zone, and generating a restoration plan for restoring power to the at least one zone.

Abstract: In embodiments of the present invention improved capabilities are described for providing intelligent power control in response to an external power interruption, causing a processor is in an electrical fixture to interrogate an external power control switch to gain an understanding of the switch's state, where prior to the external power interruption the electrical fixture may be powered by external power and where external power may be connected and disconnected by a user of the switch. In the event that the switch's state is determined to be such that it would normally pass power to the electrical fixture, the processor causes the electrical fixture to operate using a backup power supply. In the event that the switch's state is determined to be such that it would normally not pass power to the electrical fixture, the processor causes the electrical fixture to act as if the user of the switch has intentionally removed power.

Abstract: The invention relates to a modular LED lighting unit, comprising a first module (1) to which an AC supply voltage (9) can be supplied and which comprises: a second sub-module (B), at the output of which a DC supply voltage (5) is provided, which is galvanically isolated from the supply voltage, and a control unit (G), further comprising a second module (2), preferably a lamp management module, which comprises a further sub-module (C) supplied with the DC supply voltage (5) of the first module (1), preferably a constant current source, which is controlled by a control unit (E) of the second module (2), an LED module (F) which has at least one LED range (8) and is supplied by the further sub-module (C), and an emergency light operating circuit which is connected to a rechargeable energy store (ES); and takes over powering the modular LED lighting unit in the event of failure of the AC supply voltage (9).

Abstract: A power supply circuit for powering first and second groups of hard disk drives in a cabinet, includes a connector and first to third connection units. When there is only one server in the cabinet, the first node is connected to the first power terminal of the connector, the first connection unit is turned on, and the second connection unit is turned off. When there are two servers in the cabinet, the first and second nodes are respectively connected to the first and second power terminals of the connector, the first connection unit is turned on, and the second and third connection units are turned off.

Abstract: A power supply controlling circuit, includes: at least one switch configured to switch between on and off of a power supply to at least one apparatus; at least one switch controlling circuit configured to control on/off of the switch; at least one monitoring circuit configured to monitor whether or not the switch controlling circuit is operating properly; and a backup circuit configured to accumulate electric power and to control on/off of the switch by using the accumulated electric power, in a case in which the monitoring circuit determines that the switch controlling circuit is not operating properly.

Abstract: A hybrid alternating current (AC)/direct current (DC) distribution system for multiple-floor buildings includes per-floor rectifiers for converting supply side AC to DC. Each rectifier is configured to supply a plurality of DC loads associated with one floor of a multiple-floor building. The system further includes per-floor DC busses, each of the DC busses being configured to distribute the DC to the DC loads its respective floor. The system further includes at least one AC bus for supplying AC power to AC loads in the building.

Abstract: An output converter includes a DCDC conversion section, a secondary side voltage/current monitoring section detecting a power from the DCDC conversion section, a maximum operation point control section determining what voltage is to be set by the DCDC conversion section so that the power detected by the secondary side voltage/current monitoring section is maximum, a DCDC short-circuit switch via which a current from a module bypasses the DCDC conversion section to outside, a primary side voltage/current monitoring section measuring the current from the module, a module short-circuit switch switching between a state where a secondary side cathode and a secondary side anode are short-circuited and a state where they are not short-circuited, the maximum operation point control section causing the DCDC short-circuit switch and the module short-circuit switch to switch.

Abstract: The present invention is to provide a smart socket, which includes a timing unit for obtaining current time; a power receiving/output unit for receiving electricity from an external power supply or outputting electricity to a power storage device; an electricity quantity monitoring unit for detecting power value of electricity received from the power receiving/output unit; a home appliance power supply unit and an electricity selling power supply unit for transmitting electricity to an electronic device and an electricity purchaser circuit, respectively; a switching unit connected to the electricity quantity monitoring unit, home appliance power supply unit and electricity selling power supply unit, and being set with a home appliance mode, a power storage mode and an electricity selling mode; and a processing unit connected to the timing unit, electricity quantity monitoring unit and switching unit for switching mode of the switching unit according to the current time and power value.

Abstract: A power control device comprising a communication system for communicating with at least one remote agent and/or remote user input device; wherein the power control device is configured to control power supplied to or from one or more power outlets responsive to the remote agent and/or remote user input device. In certain examples, the at least one remote agent monitors and/or runs on one or more monitored devices and the remote agent is configured to monitor usage of the one or more monitored devices and signal the power control device when the monitored device has not been used and/or not received user input for a threshold period. Preferably, the power control device comprises a plurality of operational groups, each operational group comprising at least one of the one or more power outlets and each operational group of power outlets is controlled by the power control device differently and/or according to a different power control scheme to the other operational groups.

Abstract: Techniques are described for determining whether power from a first power source is unavailable to a power supply module. In response to determining that power from the first power source is unavailable, the techniques de-couple the first power source from one or more components of an electronic device connected to an output of the power supply module with one or more de-coupling components of the power supply module that connect an automatic transfer switch (ATS) of the power supply module to an output of the power supply module. Subsequent to de-coupling the first power source from the one or more components of the electronic device, the techniques de-couple a power supply module from the first power source. The techniques couple the power supply module to a second power source for delivering power to the one or more components of the electronic device.

Abstract: A battery storage system includes: an energy converting unit configured to generate electrical power; a power converter including a control circuit, and a circuit that is controlled by the control circuit to generate electrical power to be supplied from an output of the energy converting unit to a load and electrical power to be supplied to the control circuit; a power supply source including a battery storage cell and a commercial power system; and a host control circuit configured to perform control such that electrical power is supplied from the power supply source to the control circuit when an output of the energy converting unit is between a first value and a second value larger than the first value.

Abstract: A system of monitoring and/or maintaining remotely located autonomously powered lights, security systems, parking meters, and the like is operable to receive data signals from a number of the devices, and provide a comparison with other similar devices in the same geographic region to detect a default condition of a particular device, and/or assess whether the defect is environmental or particular to the specific device itself. The system includes memory for storing operating parameters and data, and outputs modified control commands to the devices in response to sensed performance, past performance and/or self-learning algorithms. The system operates to provide for the monitoring and/or control of individual device operating parameters on an individual or regional basis, over preset periods.

Abstract: A method of controlling an electrical power supply to a load, wherein said load has an associated power threshold, is provided. The method comprises using a first electrical power source to generate a first amount of power for supply to the load, wherein said first electrical power source comprises a renewable source, and determining whether to supply a second amount of power to the load from a second, different electrical power source. If it is determined that the second electrical power source should be used to supply a second amount of power to the load, controlling an output of the second electrical power source so that a combined amount of power supplied to the load from the first and second electrical power sources meets the power threshold associated with the load.

Abstract: Disclosed is an apparatus and method for controlling charge and discharge of a secondary battery. The apparatus for controlling charge and discharge of the secondary battery includes the power control unit calculates an amount of discharging power of the secondary battery, and when voltage value of the secondary battery is less than a preset reference voltage value, outputs a compensation charge control signal to charge the secondary battery with an amount of charging power obtained by adding an amount of power compensation to the calculated amount of discharging power. According to the present disclosure, the problem of a charge amount of the secondary battery reducing gradually with increasing charge and discharge cycles of the secondary battery may be prevented by compensating for the charge amount of the secondary battery.

Abstract: Multi-level data center consolidated power is disclosed. One or more controllers communicate with one or more power supplies and sensors to adapt to dynamic load requirements and to distribute DC-power efficiently across multiple IT racks. The distributed DC-power includes one or more DC-voltages. Batteries can be temporarily switched into a power supply circuit to supplement the power supply during spikes in power load demand while a controller reconfigures power supplies to meet the new demand. In embodiments, one or more DC-to-AC converters handle legacy power loads. The DC-to-AC converters are modular and are paralleled for redundancy. The AC-power is synchronized for correct power flow control. The one or more controllers communicate with the one or more AC-power supplies to dynamically allocate AC-power from the DC-to-AC converters to the multiple IT racks.

Abstract: A power supply apparatus includes a master circuit part charging a battery initially, supplying energy to a load that is a light load, and charging the battery when discharged; and a slave circuit part having a common output terminal with the master circuit part and supplying energy to the load that is a heavy load along with the master circuit part by distributing the load among them, wherein the master circuit part includes a rechargeable battery therein. Energy is supplied to a load using a battery at a low load that is a half load or less in a power supply circuit, thereby increasing energy efficiency.

Abstract: A power supply device includes a first body and a second body. The first body has an opening and an adapter module which is electrically connected to the first electronic device. The opening is divided into a first port and a second port via a first axis, and the shape of the first portion is asymmetrical with second port of the second portions. The second body has an energy storage unit. The energy storage unit is electrically connected to the adapter module to supply power to the first electronic device, when the second body is detached from the first body, the energy storage unit is adapted to supply power to the second electronic device.

Abstract: A distribution board includes: a storage battery including one or more storage batteries and electrically connected to a predetermined load; a detector which detects a power outage state in which no electric power is being supplied from a power system; a first switch between the power system and the storage battery; and a controller which controls at least the first switch. When the detector detects the power outage state, the controller turns off the first switch to electrically disconnect the storage battery and the power system, and the storage battery causes the one or more storage batteries to discharge and supplies electric power to the controller and the predetermined load.

Abstract: An electronic device includes an auxiliary battery and an input device. The input device includes a pressing layer and a piezoelectric layer which is located below the pressing layer. The piezoelectric layer is connected to the auxiliary battery. The pressing layer can be pressed to be elastically deformed. The pressing layer and the piezoelectric layer are concurrently deformed to supply current to the auxiliary battery.

Abstract: Circuits and methods providing a electronic power supply applicable to any dual supply rail systems, which require a smooth and uninterrupted output supply and a replica power path and autonomous mode of operation from the system power supply are disclosed. In a preferred embodiment of the invention the power supply is applied to a real time clock. An Innovative Replica Power Path concept and circuit implementation ensures the smooth and uninterrupted transfer of power from one input source to the other. The circuit features a Latched Supply Comparator that guarantees the commutation to the Replica Power Path only happens after the voltage is settled. Zero power consumption from the back-up energy source is achieved in the presence of an alternative higher voltage source. The generated RTC supply voltage does not suffer from abrupt changes when the voltage level of the main system power source (battery or charger) is connected or disconnected.

Abstract: An auxiliary power supply device can include an auxiliary power source configured to provide auxiliary power. An auxiliary power state detection circuit electrically can be coupled to an input or an output of the auxiliary power source and an auxiliary power supply circuit that can be electrically coupled to the output of the auxiliary power source, where the auxiliary power supply circuit can be configured to provide the auxiliary power to a target system when power supplied to the target system by a main power source is abnormal. Related systems are also disclosed.

Abstract: A plurality of modules each including at least a pair of series connected power MOSFETs are configured between a plurality of DC voltage sources, and a plurality output terminals for connection to respective loads, are controlled for selectively applying power to the loads via time delay switching incorporating forward biased intrinsic diodes of the MOSFETs in a given current path during initial application of power to a load, whereby a predetermined period of time after turning on one of the series connected MOSFETs, the associated other MOSFET is turned on to shunt its intrinsic diode for reducing the resistance in the current path to maximize current flow. The configuration of the plurality of power MOSFETs is also controlled for selectively providing bi-directional current flow between said plurality of DC voltage sources.

Abstract: A power conversion device with multiple interfaces generally includes at least one multiple-in-one connector, at least one circuit board, and a power supply module. The multiple-in-one connector and the power supply module are electrically connected to the circuit board. The power supply module satisfies the standard of an electric main socket or an automobile socket. Further, the multiple-in-one connector can be of a multiple-in-one connector that has a single plugging port and includes a USB interface combined with a card type interface or a signal connector interface or alternatively simultaneously combined with a battery module, a storage module, and a wireless transmission module to achieve an advantage of having multiple interfaces.

Abstract: A system includes a rack, computing devices coupled to the rack, a rack PDU, and one or more input power cables. The rack PDU includes an enclosure, two or more power input receptacles on the enclosure, and two or more power output receptacles on the enclosure. The output power receptacles supply power to the computing devices. The input power cables are coupled in one or more of the power input receptacles. The input power cables supply electrical power from an electrical power system to the rack PDU.

Abstract: Aspects of the present disclosure involve systems, methods, and the like, for an energy interface system for interfacing alternative energy sources with a utility power source on a premises. The energy interface system provides flexibility in the use and distribution of utility energy sources and alternative energy sources based on several measurements and criteria of the interface system. For example, the energy interface system may allow for the energy consumption to adapt to changing parameters, such as utility rate schedules, cost of alternative fuels and utility premiums for consumption or generation of energy at particular times. The energy interface system also allows for deferment of charging or other high-energy loads to be recognized by the system at otherwise low-energy times. In addition, the energy interface system allows for monitoring and communication with the system for ease of configuring the system based on one or more criteria or measurements.

Abstract: An electronic device comprising a first power switch connectable or connected between a first voltage source and a load is proposed. The first power switch assumes a conductive state in response to a power-on request and a non-conductive state in response to a power-off request, for energizing and deenergizing the load, so that a voltage across the first power switch tends to a positive high level when the first power switch is in the non-conductive state and to a positive low level when the first power switch is in the conductive state. The device further comprises a second power switch connectable or connected between a second voltage source and the load. The second power switch assumes a conductive state in response to the power-on request and a non-conductive state when the voltage across the first power switch is below a defined switch-off threshold lower than the high level. The second voltage source thus assists the first voltage source in powering up the load.

Abstract: In one embodiment, a power supply controller may be formed including configuring the power supply controller to use an error signal and a ramp signal to control a duty cycle of a switching control signal that is configured to control first and second switches to charge a battery, and configuring the power supply controller to selectively offset a dc value of the ramp signal responsively to detecting the adapter current is greater than a first value wherein offsetting the dc value of the ramp signal changes the duty cycle of the switching control signal to supply current from the battery to a load.

Abstract: A symmetric-type UPS power system based on a nine-phase phase-shifting autotransformer includes a three-phase AC power input terminal, a three-phase AC power output terminal, a nine-phase phase-shift autotransformer, a synchronized control device for controlling output of a three-phase inverter, a power-frequency isolation transformer and three circuits of output devices; wherein the three-phase AC input terminal of the nine-phase phase-shifting autotransformer is connected to the three-phase AC power input terminal, each circuit of the output devices includes a zero-sequence suppression commutating inductor, a three-phase six-pulse rectifier, a three-phase inverter and a filter inductor which are connected with each other in sequence, each circuit of the zero-sequence suppression commutating inductor is connected to the three-phase AC output terminal of the phase-shifting autotransformer, each circuit of the filter inductor is connected to the input terminal of the power-frequency isolation transformer.

Abstract: In a data center having multiple resource zones, each of the zones has an uninterruptable power supply (UPS) and associated power storage elements such as batteries. A power bus may be provided between the resource zones to connect the outputs of the power storage elements of the resource zones. The power storage elements may thereby be shared between the UPS's so that an individual resource zone may be operated for a longer duration under anomalous conditions.

Abstract: A system includes a solar power subsystem that receives power from one or more solar power arrays. A storage control subsystem is coupled to the solar power subsystem to charge a battery from the power received by the solar power subsystem. A grid power control subsystem having an AC to DC converter receives power from a power grid and provides DC voltage to the storage control subsystem. A balance of system control system controls the amount of power received from the power grid as a function of a load, battery charge and received power by the solar power subsystem. The solar array and battery may be sized to provide sufficient power under normal operating conditions, with power being drawn from the grid during abnormal operation conditions.

Abstract: A heat pump including a fluid circuit and a control arrangement. The fluid circuit includes a first heat exchanger, a second heat exchanger, a third heat exchanger and a driver for driving fluid about the fluid circuit. The control arrangement has one or more modes of operation. The first heat exchanger is arranged to exchange heat between the fluid of the fluid circuit and further fluid. The control arrangement is configured to in at least one of the modes of operation control a flow control mechanism to control a flow rate of the further fluid of the first heat exchanger.

Abstract: An uninterruptible power supply includes a first power converter, a second power converter, and a DC-to-AC converter coupled to the first power converter and the second power converter. The first power converter includes a first AC-to-DC converter and a transformer having a primary winding coupled to the input and the output, and a secondary winding coupled to the first AC-to-DC converter. The first power converter is configured, during a first mode of operation of the UPS, to provide a first portion of the AC input power as the AC output power via the primary winding and convert a second portion of the AC input power into DC power via the first AC-to-DC converter. The second power converter includes a second AC-to-DC converter and is configured to convert the AC input power into DC power via the second AC-to-DC converter during a second mode of operation of the UPS.

Abstract: An apparatus according to various embodiments may detect the state of an external switch. An apparatus according to various embodiments may activate or deactivate an appliance based on the state of the external switch. An apparatus according to various embodiments may activate or deactivate an appliance based on the state of the external switch, even in the absence of grid power.

Abstract: Disclosed herein are the energy storage system of an Uninterruptible Power Supply (UPS) equipped with the battery and a method of driving the same. The energy storage system includes a commercial power source unit configured to supply a first power source to a load, and the battery configured to supply a second power source to the load. And the system monitors a power failure state in the commercial power source unit, determines a charging state of the battery, and controls the commercial power source unit and the battery in response to output of monitoring or determination, so that the first power source or the second power source is supplied to the load. A power reservation ratio for the use of power can be increased by reducing power used during daytime.

Abstract: An electrical power system and a method of managing electrical power. Some embodiments provide improved fault isolation and service continuity circuitry. In some embodiments, a first source breaker is connected in series with a first load breaker. The load breaker can include a shunt trip, and the source breaker can include an associated lockout relay. The lockout relay can be in controlling communication with the shunt trip. Each source breaker can be in power-receiving connection with a power source. A controller can close and open the breakers according to which power source can provide power.

Abstract: A power supply system for supplying a load with electric energy from an electrical network can include at least one power supply module. The power supply module can include a DC link to be supplied from the electrical network; and an inverter connected to the DC link and configured to convert a DC voltage from the DC link into an AC voltage to be supplied to the load. An electric energy storage can be charged by the DC link and for supplying the DC link with electric energy, when the electrical network has a power failure, the electric energy storage connected with one input to a neutral point of the power supply module. The power supply module can include a bidirectional buck/boost converter connected to a positive potential or negative potential of the DC link, to the neutral point and to another input of the electric energy storage.

Abstract: A hybrid power architecture for lighting system that physically separates the conversion of AC-DC constant voltage power from the conversion of DC-DC constant current needed to drive the LEDs. The hybrid power architecture comprises a power converter to generate DC volt power, a battery backup unit for providing backup in the event of power failure and control architecture for controlling the intensity of the lighting system.

Abstract: One or more outdoor lights may operate independently with sensing and control processes mainly on-pole, or may communicate as a networked array of poles, wherein a master/coordinating pole/node transmits signals from the networked array to a control station, and receive signals from the control station for the networked array, via call phone and/or satellite. Independent poles and/or the networked array of poles may be adapted for energy-saving processes; cooperation with the grid; renewable power production and storage by means of solar panels and associated batteries; and/or to provide Wi-Fi hot-spots, public safety alarms, information or data-analysis to the public or customers. An energy-saving active control system controls charging of the batteries and distribution of energy from the solar panel and/or the batteries, so that the batteries remain undamaged, and the light(s) remain operation even during the winter or other long periods of clouds and diffuse light.

Abstract: Disclosed is a battery cell system, which provides regulation service to the grid, as well as the battery being used as part of an uninterruptible power supply (UPS). Part of the capacity of the storage batteries may be used for regulation service, while maintaining a reserve of battery capacity to provide the UPS supply if required. An advantage is that the battery installation can be more effectively monitored as it is more regularly being charged and discharged.

Abstract: A DC uninterruptible power supply system includes plural uninterruptible power supply devices, each of which includes a power cord, a battery module, a voltage detecting circuit, a current detecting circuit, and a control unit. When the voltage detecting circuit detects that a voltage at the power cord is lower than a first preset value, the control unit controls the battery module to output electrical power to the power cord. When the current detecting circuit detects that current of another uninterruptible power supply device is smaller than a second preset value, the control unit controls a switch to permit current flow to the another uninterruptible power supply device.

Abstract: Provided are a system and a method for controlling a frequency. The system for controlling the frequency includes: at least one power supplying unit generating power; at least one systematic unit consuming the power generated from the power supplying unit; at least one standby power unit storing the power generated from the power supplying unit and including at least one storage device; and at least one grid unit connecting the power supplying unit, the systematic unit, and the standby power unit to one another and controlling a frequency of the systematic unit.

Abstract: An electronic device includes a case; a power source unit including a heat generation unit, the power source unit being configured to be inserted in the case and slidable between a stored state in which the power source unit is stored in the case and an exposed state in which at least the heat generation unit is exposed from the case; a detection unit configured to detect the stored state or the exposed state of the power source unit; and a control unit configured to control a load with respect to the power source unit, according to the stored state or the exposed state detected by the detection unit.

Abstract: Low leakage current power supply methods, systems, and apparatus are described. In one example, a medical system includes a plurality of medical devices and a power supply configured to provide alternating current (AC) power to the plurality of medical devices. The power supply includes an input configured to receive AC power from an AC power source, an isolated switching power converter coupled to the input to receive the AC power and output AC power, a controller coupled to the isolated switching power converter and configured to control operation of the isolated switching power converter, and an output coupled to the isolated switching power converter to provide the AC power output.

Abstract: A combined system incorporating one or more DC/AC inverter systems or sub-systems, and one or more constant current sources and/or constant current sinks is disclosed. Various embodiments of this invention simultaneously deliver AC electrical power, as well as source or sink constant current to or from one or more electrical loads. Powered by one or more DC power sources, this invention combines into a single standalone multi-function unit the capability to deliver AC electrical power and also constant source or sink currents for LED lighting for general illumination or signaling, and optionally, also for charging or discharging one or more batteries. Examples of constant current loads driven by this invention include, but are not limited to, visible, infrared or ultra-violet LEDs, laser diodes and batteries of arbitrary composition, construction and voltage/current ratings in controlled charge or discharge mode.

Abstract: An electrical power system includes a standby electrical generator configured to convert mechanical energy to electrical energy for electrically powering one more loads, at least one thermostat coupled to an air handling system, and a communication device for network communication to at least one remote user interface. The standby electrical generator and the at least one thermostat are configured to provide information relating to the operational characteristics of the standby electrical generator and the at least one thermostat to the at least one remote user interface via the communication device.

Abstract: The invention is an electrical power system for powering quasi-remote loads wherein local electric utility power is stepped up in voltage and transmitted to a remote battery bank via a low cost, two-conductor, direct burial cable. The system is configured such that current in is this cable is relatively low and constant. The battery bank is used to buffer the low power feed from the electric utility source and the high power, high crest factor remote loads. An inverter, like the type used with off-grid solar power systems, converts the DC battery power to AC power to supply the remote loads.

Abstract: A power transformation system for powering a device indirectly through an electrical load connected to a power source. The transfer of energy from the power source via the load may go undetected. The system may store energy from the load in an ultra or super capacitor. This energy may be used to power Wi-Fi and various thermostat applications, among other things, associated with HVAC and building automation and management systems. Energy from the load may be supplemented or substituted with energy from a battery and/or a buck converter.

Abstract: A charge system includes a main body and a wireless keyboard removably mounted on the main body. The wireless keyboard includes a connecting module, a battery charge module, a detecting module and a solar charge module. When the wireless keyboard is mounted on the main body, the main body charges the wireless keyboard, and the battery charge module is charged by the main body. When the wireless keyboard is removed from the main body, the detecting module detects an energy dump of the battery charge module. When the energy dump is not lower than a preset energy, the wireless keyboard is powered by the battery charge module. When the dump energy is lower than the preset energy, the solar charge module powers the wireless keyboard. The patent further discloses a charge method.

Abstract: For reducing the current consumption from a battery in order to lengthen a battery remaining time when an interruption in a mains supply voltage occurs and battery backup operation follows, a controller initiates shutdown operation of selected devices.—Some of the selected devices experience a shutdown delay of, for example, 1-4 minutes, referred to as a transitional shutdown delay interval, from a time immediately following the interruption to a time when shutdown is fully completed. During the transitional shutdown delay interval, battery remaining time is calculated by using a value that is indicative of anticipatory current consumption, instead of by using the actural real time current measurements. Thus, fluctuation of the current consumption, during the transitional shutdown delay interval, will have no effect on a signal containing the battery remaining time, during the transitional shutdown delay interval.

Abstract: A system with two-stage output voltage includes an external power source unit, a dying gasp control circuit unit, and a power source storage unit. The dying gasp control circuit unit is connected to the external power source unit via signals to monitor whether an output power outputted from the external power source unit is interrupted or not. The power source storage unit is connected to the external power source unit and the dying gasp control circuit unit via signals. The output power outputted from the external power source unit is initially stored in the power source storage unit, and an output voltage outputted from the power source storage unit is controlled by the dying gasp control circuit unit. When the output voltage is changed to a predetermined voltage, the system is notified to execute a dying gasp operation.