Abstract: A method of manufacturing a semiconductor laser element including: preparing a wafer; forming first grooves on at least one of an upper surface and a lower surface of the wafer, each of the first grooves being spaced apart from the optical waveguide formed in the wafer and extending in a direction intersecting the optical waveguide in a plan view; forming second grooves on the one of the upper surface and the lower surface of the wafer, each of the second grooves extending in a direction intersecting a straight line extended from each of the first grooves, and each of the second grooves having a smooth surface compared with the first grooves; dividing the wafer along the first grooves to obtain a plurality of laser bars; and dividing the laser bars in a direction intersecting an extending direction of the first grooves to obtain the semiconductor laser elements.

Abstract: A method of manufacturing a frequency tunable terahertz transceiver including two separate distributed feedback lasers manufactured in one substrate, includes forming a lower clad layer on the substrate, forming an active layer on the lower clad layer, forming an upper clad layer on the active layer. And interposing first and second diffraction grating layers between the upper clad layers. A diffraction grating is manufactured by etching the first and second diffraction grating layers. The active layer is integrated into a passive waveguide. An electrode is formed on the upper clad layer.

Abstract: A frequency tuneable or chirped laser device is described that includes a laser cavity formed from a plurality of optical components. The optical components include a laser source for generating a beam of light, a spectral tuning element and one or more further optical components for directing the beam of light on to the spectral tuning element. At least one of the plurality of optical components is moveable in a first degree of freedom; such movement simultaneously altering the effective optical path length of the laser cavity and the tuning frequency of the spectral tuning element. The effective optical path length and the tuning frequency of the device are substantially insensitive to any movement of said at least one moveable optical component in degrees of freedom other than the first degree of freedom. This provides frequency tuning in which mode hopping is suppressed.

Abstract: A spark plug (20) for being threaded into a cylinder head (28) includes a shell (24) with threads (26) disposed at a predetermined angled relative to the ground electrode (34). The position of the threads (26) relative to the ground electrode (34) places the ground electrode (34) in a predetermined position in the combustion chamber (22) and relative to components of the engine, thus allowing the ground electrode (34) to provide a robust and reliable ignition. The threads (26) are formed by a thread forming apparatus (102) that includes an orientation tool (38) to position the ground electrode (34) relative to a thread forming apparatus (102), allowing the thread forming apparatus (102) to form the threads (26) at the desired angle (?).

Abstract: A plasma ignition plug for an internal combustion engine has a thorium alloyed tungsten anode separated from a vanadium- or beryllium-alloyed copper cathode by a boron nitride ceramic powder insulator. A generally semi-spherical titanium emitter is electrically coupled to the anode and disposed within an end of the insulator so as to form an annular gap with a torus on the end of the cathode. The surface of the emitter protrudes slightly beyond the rim of the torus on the cathode. High amplitude pulses driven into the anode arc across the annular gap to the cathode at more than twenty-four spots simultaneously, generating a plasma ignition front.

Abstract: A ground electrode comprised of a noble metal tip having an outer circumferential surface, a holder having an inner circumferential surface defining a through hole for the noble metal tip thereon, and a body to which the holder is joined. At least one of a) the inner circumferential surface of the holder which forms the through hole, and b) the outer circumferential surface of the noble metal tip which is disposed in the through hole, continuously reduces in diameter toward the forward side. A forward end surface of the noble metal tip is located on a forward side with respect to a forward end surface of the holder.

Abstract: An ignition plug having a center electrode, a grounding electrode, an insulator, and a metal shell. The center electrode is held by the insulator, and the insulator is held by metal shell. A cavity is formed between the grounding electrode and the center electrode. The grounding electrode is joined to the inner wall surface of the metal shell via a melting portion. In the melting portion, in a predetermined cutting surface MS including a melting deepest point DP and a central axis CX, a percentage ratio MDD of a melting depth MD of the melting portion with respect to a thickness of the grounding electrode is 5% or more, and an area Sm of a portion included in an outer circumferential side of the metal shell is 10% or more of the entire area S.

Abstract: An industrial control panel is provided that comprises a zone enclosure unit and an equipment segregation unit. The zone enclosure unit has a back panel, a plurality of side panels, a top panel, a bottom panel, and a door to access the interior of the zone enclosure unit. The zone enclosure unit is adapted to contain a first set of electrical equipment. The equipment segregation unit may be mounted to the zone enclosure unit. The equipment segregation unit has a back panel, a plurality of side panels, a bottom panel, and a door to access the interior of the equipment segregation unit. The equipment segregation unit is adapted to contain a second set of electrical equipment. The first set of electrical equipment is capable of being electrically connected to the second set of electrical equipment.

Abstract: An unwelded explosion-proof drain cable gland assembly includes: a gland nut that is disposed on an outer circumference of a flexible tube and has a seat protruding inward; a gland having a cylindrical compression pin part that is formed at an upper portion thereof, an annular flange that is formed integrally with the compression pin part and protruding in a radial outward direction, and a binding part that is integrally formed under the flange and is inserted into and bound to the flexible tube; a gland washer that is installed in front of the gland and comes into surface contact with an upper surface of the compression pin part; a rubber packing that is disposed in front of the gland washer and has a hollow interior; and a coupling into which the rubber packing is fitted and whose outer surface is threaded to be coupled with the gland nut.

Abstract: A cable rail assembly including a first cable rail having a base, a cover, and a closing member, a second cable rail having a base, a cover, and a closing member, and wherein the first and second cable rails are engageable with each other along a longitudinal axis of the first and second cable rails.

Abstract: A high voltage conductive wire includes a first conductor, configured to perform as one of a plus pole and a minus pole, a first insulator, provided outside of the first conductor, a second conductor, configured to perform as the other of the plus pole and the minus pole, provided outside of the first insulator, and formed by a metallic pipe, and a second insulator, provided outside of the second conductor so as to cover an outer face of the second conductor. A cross sectional area of the second conductor is set corresponding to a cross sectional area of the first conductor. The second conductor is configured to hold a shape itself so as to be arranged along an arrangement pathway.

Abstract: A condulet coupler is provided for attachment to a condulet. The condulet coupler can facilitate tapping into an existing conduit system and reclosing the condulet opening to introduce new conduit runs beginning midstream in an in-place conduit and to introduce splices in an existing run. Other functional changes, such as rerouting select wiring, can also be served by the condulet coupler.

Abstract: A wall plate including a plate having a front surface and a rear surface, rear walls extending from and away from the rear surface to form a cavity, and a gasket positioned wholly within the cavity. The gasket may be positioned adjacent the rear walls or adjacent at least one aperture within the plate.

Abstract: A cover assembly for a floor box includes a base with a central opening and a cover pivotally connected to the base by a hinge member. The hinge member has a hinge body with a first end pivotally connected to the base for pivoting with respect to the base and second end pivotally connected to the cover for pivoting with respect to the cover. A tab extends from the second end of the hinge body to contact a bottom surface of the cover to limit pivoting movement of the cover with respect to the hinge body. A slide surface is provided on the base that contacts an end of the cover during pivoting movement of the cover to prevent wear on a gasket with the opening of the base.

Abstract: The busbar unit includes a first busbar having a substrate section provided with first fusible portions, and a first plate section that extends from the substrate section; a second busbar having a substrate section provided with a second fusible portion, and a second plate section overlapped with the first plate section; and an insulating housing section that accommodates the plate sections in a state in which the plate sections are overlapped with each other. The first plate section is provided with a retainer that fixes the first and second plate sections so that the first and second plate sections are not displaced in either a direction in which the first and second plate sections approach each other, or a direction in which the first and second plate sections are overlapped with each other.

Abstract: The present invention provides a hydroelectric turbine system comprising an array of turbines in series and a cabling system for use in connecting together adjacent turbines in the array, the cabling system being designed to allow the majority of the cabling connecting adjacent turbines to be laid substantially in line with the direction of tidal flow in order to reduce stress on the cabling system when the turbines are deployed on the seabed at sites of high tidal flow.

Abstract: The present invention includes a method for providing ground fault protection to a generator. The method includes determining the existing state of the generator and second, determining the updated alarm or trip conditions of a relay connected to the generator in view of the existing state of the generator. This includes estimating a ratio of the magnitude of the 3rd harmonic neutral voltage to the magnitude of the 3rd harmonic terminal voltage of a generator, along with calculating the residual 3rd harmonic voltage from the estimated 3rd harmonic ratio. From this, a comparison is made between the energy of the residual voltage with a fractional energy of the 3rd harmonic neutral voltage. Based on this comparison, an alarm or trip condition is signaled when the energy of the residual voltage is greater than the fractional energy of the 3rd harmonic neutral voltage.

Abstract: Provided is a current mode step-down switching regulator which is capable of enhancing over-current limiting characteristics even when an over-current limiting function operates to reduce an output voltage. The current mode step-down switching regulator includes a pulse adjusting circuit. When an over-current is detected, a switching output signal is thinned out by the pulse adjusting circuit to be outputted in order to reduce an apparent oscillation frequency, thereby reducing an influence by response delay in an over-current detecting comparator.

Abstract: A circuit protection system for a power panel is disclosed. The circuit protection system includes a transistor connected in a channel of a power panel, the transistor connected between return connections of a load and a return path, and the power panel including a plurality of channels connected to the load. The circuit protection system also includes control circuitry electrically connected in parallel with the transistor, the control circuitry configured to selectively activate the transistor to allow current to pass through the transistor based on an observed voltage across the transistor.

Abstract: Anti-arcing circuits are described herein that are configured to prevent or substantially mitigate arcing when a power adapter is connected/disconnected from a client device. The anti-arcing circuit restricts power supplied when a connection of a connector of a power adapter to the adapter interface is not fully established. The anti-arcing circuit is further configured to detect when a connection is made and remove the restriction to supply power for operations of the client device. In one approach, the anti-arcing circuit includes two different paths and components associated with a detection mode and operational mode respectively. In the detection mode, power supply is suppressed and a current pulse may be sent to determine if a connection is established. If current is detected, a switch is made to operational mode and power for normal device operations is supplied.

Abstract: An integrated circuit generating a driving signal to a load according to an input voltage and including an impedance switching unit, a first protection unit, a first detection unit and a control unit is disclosed. The impedance switching unit takes the input voltage as the driving signal according to a control signal. The first protection unit generates a first detection signal when a current passing through the impedance switching unit is higher than a predetermined current. The first detection unit detects a voltage of the impedance switching unit to generate a detection result. The control unit controls the control signal according to the first detection signal.

Abstract: The disclosure describes a method for limiting a switch-on current in an electrical system which is supplied with power by a battery. During a switch-on process, an electrical load is connected to the electrical system and precharged by means of a precharging resistor. A monitoring unit regularly records operating data of at least one variable which influences a temperature of the precharging resistor and estimates the temperature of the precharging resistor on the basis of said operating data. The disclosure also describes an apparatus and a battery which are designed to execute the method according to the disclosure.

Abstract: Provided is a voltage regulator capable of suppressing an overshoot with low current consumption. A comparator of an overshoot detection circuit is activated only when a power supply fluctuation occurs, and the comparator outputs a signal for reducing an overshoot occurring in an output voltage. In a steady state, the comparator of the overshoot detection circuit is turned off to prevent the current from being consumed.

Abstract: A semiconductor device is disclosed that includes a first well of a first conductivity type, a second well of a second conductivity type, a plurality of first regions, a second region and a plurality of electrodes. The first regions are of the first conductivity type and are formed in the second well. The second region is of the second conductivity type and is formed in the first well. Each of the electrodes is formed upon the second well and between adjacent two first regions of the first regions.

Abstract: The invention provides a method of forming an electric field gap device, such as a lateral field emission ESD protection structure, in which a cathode layer is formed between dielectric layers. Anode channels are formed and they are lined with a sacrificial dielectric layer. Conductive anode pillars are formed in the anode channels, and then the sacrificial dielectric layer is etched away in the vicinity of the anode pillars. The etching leaves a suspended portion of the cathode layer which defines a lateral gap to an adjacent anode pillar. This portion has a sharp end face defined by the corners of the cathode layer and the lateral gap can be defined accurately as it corresponds to the thickness of the sacrificial dielectric layer.

Abstract: Disclosed is a distributed battery management system of managing a plurality of battery modules, including: slave controllers have a daisy chain structure in which the slave controllers are connected from a bottom-level slave controller up to a top-level slave controller in series, sequentially transfer control information received from the outside from the top-level slave controller up to the bottom-level slave controller, sense information on the battery modules in response to the transferred control information, sequentially transfer the sensed sensing information from the bottom-level slave controller up to the top-level slave controller, and transmit the sensing information transferred to the top-level slave controller to the outside; and a master controller which transmits the control information to the top-level slave controller among the slave controllers and manages the battery modules by using the sensing information received from the top-level slave controller.

Abstract: A power supply system that supplies electric power to a load includes a first power storage device, a second power storage device, a power line for transmitting electric power input and output to and from the load, a converter for executing bidirectional DC voltage conversion between the first power storage device and the power line, and a switch connected between the second power storage device and the power line. When the switch is OFF, the control device performs voltage control of the converter so that a voltage value of the power line becomes a voltage command value, and when the switch is ON, the control device performs current control of the converter so that a current value of the first power storage device becomes a current command value.

Abstract: A method is described herein for adjusting energy consumption of a pre-programmed device operating at a first energy level. The method includes receiving a first signal from a first utility signal that includes first instructions to adjust the energy consumption of the pre-programmed device to a second energy level. The pre-programmed device is programmed during manufacturing to operate at the first energy level and the second energy level. The method further includes processing the first signal to retrieve the instructions. The method also includes adjusting an energy source from the first energy level to the second energy level based on the first instructions. The method also includes sending a first notification to the first utility confirming that the pre-programmed device is operating at the second energy level.

Abstract: Disclosed is a control system for use with one or more building power circuits, the control system including a control device delimited by a control device housing, the control device being configured to receive power from the building power circuits and provide power to at least one power output, and a receiver configured to receive radio frequency signals, the receiver being disposed remote of the control device housing and configured for removable wired connection with the control device.

Abstract: An apparatus provides electrical power to a ship in port. A first interface interconnects the apparatus with a power grid of the port receiving an input power signal. A second interface interconnects the apparatus with an electrical power grid of the ship to provide an output power signal. Power conversion circuitry receives the input power signal at a first voltage level and generates the output power signal at a selected voltage level and at a selected frequency level responsive to the input power signal. Power control circuitry configures the operation of the power conversion circuitry to generate the output power signal at the selected voltage level and the selected frequency level.

Abstract: An apparatus for removing harmonic noise from a power transmission line transmitting electricity at a primary frequency includes a filter and a controller coupled to the sensor and to an actuator-generator. The filter separates electricity at a harmonic of a primary frequency from the electrical signal transmitted by the power transmission line. The controller is configured to modulate consumption of electricity from the power transmission line. The consumption is controlled by electrical actuation of the actuator-generator, such that the electrical actuation of the actuator-generator causes consumption of electricity from the power transmission line at a harmonic of the primary frequency. The actuator-generator is coupled to an elastically deformable component, such that electrical actuation of the actuator-generator generates tension in the elastically deformable component.

Abstract: A power management system includes a plurality of electrical instruments and a power management apparatus. Each of the plurality of electrical instruments has at least one characteristic function and an arbitration function which is discriminated from the characteristic function and requires power arbitration. Each electrical instrument includes a plurality of operation algorithms having at least one characteristic function, operation levels respectively corresponding to the plurality of operation algorithms, power information for the respective operation levels, and power information of the arbitration function. The power management apparatus receives power rate information from a power provider, determines the operation levels of the plurality of electrical instruments and controls the electrical instruments to be driven at the determined operation levels.

Abstract: The present invention relates to a method for controlling a reactive power source in a wind power plant, the method comprising the steps of providing a wind turbine reactive power control signal and providing an active power reference signal, said active power reference signal being a measure of an active power production of the wind power plant. A control signal for the reactive power source is generated by combining the wind turbine reactive power control signal and the active power reference signal in such a way that the control signal for the reactive power source becomes a weighted signal of the wind turbine reactive power control signal. Moreover, the present invention relates to control units and wind power plants suitable for carrying out the present invention.

Abstract: An apparatus for voltage balancing parallel arranged direct current (DC) voltage source strings in a power generation system includes a string voltage balancing circuit having reverse blocking switches to control a current flow and an output voltage of the DC voltage source strings. Capacitors are connected to a corresponding reverse blocking switch and in series with a corresponding one of the plurality of DC voltage source strings to construct a voltage difference for a corresponding one of the plurality DC voltage source strings. The string voltage balancing circuit adjusts an output voltage of the DC voltage source strings by controlling a current flowing in the plurality of DC voltage source strings to adjust a voltage constructed across corresponding ones of the capacitors to balance the output voltage for the DC voltage source strings to be substantially the same output voltage. Current balancing using differential power processing is also provided.

Abstract: A power distribution system which may be provided in an aircraft for example is described, the power distribution system comprising: a power distribution bus and a plurality of localized voltage converters each supplied by the power distribution bus. By providing a plurality of localized voltage converters, the power distribution system may use fewer, or just a single power distribution bus at a particular voltage and convert to the desired voltage at or near to each of a plurality of pieces of electrical equipment being supplied.

Abstract: A control for a vehicle including a battery, an auxiliary load, an electric power controller controlling electric power exchanged between the battery and the auxiliary load and a charger charging the battery using a power supply outside the vehicle includes: during vehicle drive control, controlling the electric power controller so that an SOC falls within a predetermined range; when the power supply is connected to the vehicle, controlling the electric power controller and the charger so as to carry out extended charging in which a variation in the SOC during the external charging is larger than a width of the predetermined range that is a control range from a control lower limit value to a control upper limit value during drive control; and calculating the full charge capacity by multiplying a ratio of a maximum value of the SOC to a variation in the SOC during the extended charging by an accumulated value of current flowing into the battery during the extended charging.

Abstract: A battery control device is provided that uses a discharge to adjust the capacitance of cells that form a bipolar battery and calculates the voltage increase value of the remaining cells that do not discharge to adjust capacitance if one or more cells, among all of the cells that form the bipolar battery, are discharged to adjust capacitance in a battery control device that controls voltage dispersion or volume dispersion between cells that form the bipolar battery; and setting the general discharge value when there is a discharge to adjust capacitance on the basis of the result of the voltage increase value calculation.

Abstract: Provided is an electronic device capable of supplying desired electric power to a load so as to operate the load even in a case where charged power is minute and a voltage increase rate of a capacitor, which increases by charge, is low. The electronic device includes: a power source which has supply power less than consumption power of the load; a capacitor to be charged with the supply power; and a charge/discharge control circuit which controls charging of the capacitor and consumption of charged power of the capacitor by the load, and the charge/discharge control circuit includes: a first node to which the supply power of the power source is supplied; and a circuit which charges the capacitor with the supply power from the first node.

Abstract: An apparatus and method for charging a battery with an improved charging performance and a reduced degradation of the battery. A battery charging profile is configured to achieve a minimal degradation of a selected battery possible for a given charge time. A minimization is achieved using battery degradation modeling data indicative of a battery degradation level of a selected battery, and voltage and temperature response modeling data indicative of a predicted battery voltage and a predicted battery temperature of the selected battery as a function of time and charging current.

Abstract: System and methods for balancing a vehicle battery system are presented. In certain embodiments, a method for balancing a vehicle battery system including a plurality of sections may include calculating a plurality of quanta of energy required for each of the plurality of sections to reaching a balancing point. Based at least in part on the calculated plural of quanta of energy, it may be determined that the plurality of sections of the battery system are unbalanced. To balance the battery system, a balancing system may be selectively actuated to change the amounts of energy stored in one or more of the plurality of cells such that the plurality of quanta of energy are within a particular range.

Abstract: An intelligent robot system comprising an intelligent robot (100) and a charging base (200). The intelligent robot (100) comprises a docking electrode (102), a walking mechanism (106) and a control unit (105). The docking electrode (102), the walking mechanism (106) and the control unit (105) are disposed in the body (101) of the intelligent robot (100). The charging base (200) comprises a charging electrode (201) disposed on the body (101) of the charging base (200). The intelligent robot (100) further comprises a gripping mechanism (107). When the docking electrode (102) and the charging electrode (201) dock successfully, the control unit (105) controls the e gripping mechanism (107) to lock the walking mechanism (106) to enable the intelligent robot (100) to maintain a successful docking state in the charging base (200), preventing the charging electrode (201) of the charging base (200) from being separated from the docking electrode (102) due to the improper movement of the walking mechanism (106).

Abstract: A portable solar energy generation system has a solar energy receiver having a plurality of solar cells for converting solar energy into a DC voltage. A solar tracking mechanism enables the solar energy receiver to track a position of the sun with respect to the solar cells and to position the solar cells responsive thereto. Power circuitry generates at least one output voltage to power an electronic device responsive to the DC voltage. A housing contains each of the solar energy receiver, the solar tracking mechanism and the power circuitry in a portable configuration.

Abstract: Disclosed is battery charging circuit having a first detection circuit and a second detection circuit for detecting when to terminate an activated voltage collapse protection operation. The first detection circuit may be an analog design and the second detection circuit may include digital circuitry.

Abstract: A power source device includes an assembled battery having a plurality of secondary battery cells connected in series, and a plurality of discharge circuits connected in parallel with the secondary battery cells, respectively. A charge control circuit performs constant current charging to the assembled battery, and when voltages of one or a plurality of the secondary battery cells out of the plurality of secondary battery cells have reached a prescribed first voltage, drives the discharge circuits connected to the secondary battery cells whose voltage have reached the first voltage to discharge, and performs constant voltage charging to the relevant assemble battery.

Abstract: A battery module is provided. The battery module includes a battery set, a voltage measurement unit, a temperature measurement unit, a matrix calculation unit and a mix algorithm unit. The voltage measurement unit measures a voltage matrix of the battery set. The temperature measurement unit measures a temperature of the battery set. The matrix calculation unit calculates a norm of the voltage matrix. The mix algorithm unit reduces a remaining capacity of the battery module by a first predetermined rate if the change of the norm is larger than a predetermined value and the rise of temperature is larger than a predetermined difference for a predetermined time, and reduces the remaining capacity of the battery module by a second predetermined rate if the change of the norm is larger than the predetermined value and the rise of temperature is not larger than the predetermined difference.

Abstract: A charging system is provided for charging a chargeable battery. The charging system includes a phase-shifting transformer and a converting unit. The phase-shifting transformer includes a three-phase primary winding assembly and plural three-phase secondary winding assemblies. After a three-phase AC input voltage is received by the three-phase primary winding assembly, the three-phase AC input voltage is decreased, so that plural three-phase AC output voltages are outputted from respective three-phase secondary winding assemblies. The converting unit is electrically connected with the phase-shifting transformer, and includes plural three-phase rectifying circuits and a DC-DC converting circuit. The plural three-phase AC output voltages are rectified by the three-phase rectifying circuits, and the rectified voltage is converted into a DC charging voltage to charge the chargeable battery.

Abstract: An apparatus for wireless charging using radio frequency (RF) energy includes a first charger portion having first and second charging areas. The first and second charging areas are located in a common plane, each having at least one coil for wirelessly charging a charge-receiving device placed in proximity thereto. The coils include respective windings, which are wound in opposing directions, each coil being connected in series, each coil configured to charge at least one charge-receiving device. A second charger portion has a third charging area having at least one coil including a winding for wirelessly charging a charge-receiving device placed in proximity to the third charging area, the coil in the third charging area being connected in series with the coils in the first and second charging areas, the third charging area located in a plane that is orthogonal to the plane of the first and second charging areas.

Abstract: Adaptive multi-pathway wireless charging is described. In one aspect, embodiments enable one or more wireless charging pathways to be established concurrently in a wireless charging environment. The wireless charging pathways use same or different frequencies, powers, wireless power transfer (WPT) standards, and WPT configurations. Embodiments for adaptively configuring wireless charging based on detected events or changes in WPT characteristics are also provided.

Abstract: A system and a method to provide alignment between a source resonator and a capture resonator. The system and method may be used to align a vehicle having a capture resonator to the source resonator of a wireless inductive battery charging system for an electric vehicle. The system includes a display device, a sensor to determine a location of the source resonator relative to the capture resonator, and a controller in communication with the source resonator, the capture resonator, the sensor, and the display device. The controller is programmed to determine a relative distance and a relative direction between the source resonator and the capture resonator, determine a transfer efficiency of electrical power between the source resonator and the capture resonator. The display device is configured to indicate the relative distance and the relative direction between the source resonator and the capture resonator and indicate the transfer efficiency.

Abstract: There is provided a charging apparatus and a wireless charging apparatus that facilitate display of a fully charged state using a monochromatic display device. The charging apparatus and the wireless charging apparatus include a power supply unit supplying a charging power, a charging unit supplying the charging power to an external charging target device, a charging control unit controlling a charging state of the charging unit, a display unit that displays the charging state under the control of the charging control unit and, when the charging target device is in a fully charged state, stops an operation of displaying the charging state, and a delay unit that delays stopping the operation of the display unit that displays the charging state, for a previously set period of time, when the charging target device in the fully charged state is recharged.