Abstract: A SiC substrate (1) has an off angle ?°. A SiC epitaxial layer (2) having a film thickness of Tm ?m is provided on the SiC substrate (1). Triangular defects (3) are formed on a surface of the SiC epitaxial layer (2). A density of triangular defects (3) having a length of Tm/Tan ?×0.9 or more in a substrate off direction is denoted by A. A density of triangular (3) defects having a length smaller than Tm/Tan ?×0.9 in the substrate off direction is denoted by B. B/A?0.5 is satisfied.

Abstract: A power system and a power method for a power system that includes a first power source operatively connected to an input of a first power device. The power system also includes a switch unit having a first input operatively connected to the output of the first power device. The power system further includes a second power source operatively connected to a second input of a second power device. A second output of the second power device connects to a second input of the switch unit, wherein a third output of the switch unit provides an output parameter responsive to at least one of the output of the first power device and the second output of the second power device.

Abstract: The invention relates to an apparatus and method for tracking energy consumption. An energy tracking system comprises at least one switching element, at least one inductor and a control block to keep the output voltage at a pre-selected level. The switching elements are configured to apply the source of energy to the inductors. The control block compares the output voltage of the energy tracking system to a reference value and controls the switching of the switched elements in order to transfer energy for the primary voltage into a secondary voltage at the output of the energy tracking system. The electronic device further comprises an ON-time and OFF-time generator and an accumulator wherein the control block is coupled to receive a signal from the ON-time and OFF-time generator and generates switching signals for the at least one switching element in the form of ON-time pulses with a constant width ON-time.

Abstract: A SiC substrate (1) has an off angle ?°. A SiC epitaxial layer (2) having a film thickness of Tm ?m is provided on the SiC substrate (1). Triangular defects (3) are formed on a surface of the SiC epitaxial layer (2). A density of triangular defects (3) having a length of Tm/Tan ?×0.9 or more in a substrate off direction is denoted by A. A density of triangular (3) defects having a length smaller than Tm/Tan ?×0.9 in the substrate off direction is denoted by B. B/A?0.5 is satisfied.

Abstract: A device for charging battery cells has conductive lines to be coupled to the battery cells, a charge control circuit coupled to the conductive lines to charge the battery cells, and to determine voltages of the battery cells, and switches to balance the voltages among the battery cells. In operation, the charge control circuit charges the battery cells while determining the voltages of the battery cells, and suspends from charging the battery cells before determining the voltages of the battery cells in a second stage.

Abstract: A vehicle power management system includes a backup battery and an isolation circuit. The isolation circuit has a switch in parallel with a diode. The isolation circuit is electrically connected to the backup battery. The isolation circuit electrically isolates the backup battery from a non-critical load when the switch is open.

Abstract: In one embodiment, a method for frequency control in a wireless power transmitter comprises detecting a resonant frequency of the wireless power transmitter, determining an optimized frequency that is at least approximately 1% greater than the detected resonant frequency, and operating the wireless power transmitter at the optimized frequency. In one embodiment, the optimized frequency is approximately 1% to 15% greater than the detected resonant frequency. In one embodiment, the optimized frequency is approximately 5% greater than the detected resonant frequency. In one embodiment, the method further comprises detecting an amount of change in the resonant frequency of the wireless power transmitter, adjusting the optimized operating frequency by the amount of change in the resonant frequency, and operating the wireless power transmitter at the adjusted optimized operating frequency.

Abstract: The present disclosure relates to a structure including a voltage selection circuit which includes a first device and a second device, the voltage selection circuit is configured to output a higher voltage of a first supply voltage and a second supply voltage through one of the first device and the second device, and a voltage difference between the first supply voltage and the second supply voltage is less than a threshold voltage.

Abstract: A method for regulating a converter to autonomously stabilize the frequency of a microgrid comprising a generating set, the method comprising: a determination of a power regulation variable from a power variation resulting from the initial power setpoint from which the estimated active power and the active damping value have been subtracted, a calculation of a second power variation at least from the difference between the power regulation variable and the estimated active power, and a determination of a frequency command value for commanding the converter from the second power variation, a reception of a frequency value characteristic of a load variation of said microgrid to which the converter is intended to be connected, and a determination of an active damping value from the received frequency value.

Abstract: A system for wirelessly communicating with aircraft galley inserts is disclosed. In one or more embodiments, a galley insert includes a communication interface configured to establish connectivity with an on-board WiFi router. The galley insert may further include a controller communicatively coupled to the communication interface. The controller may be configured to communicate with at least one device (e.g., a portable electronic device, another galley insert, etc.) in the aircraft cabin via the on-board WiFi router. In some embodiments, the communication interface may additionally or alternatively be configured to establish connectivity with at least one device in the aircraft cabin via at least one short-range wireless communication protocol (e.g., Bluetooth, Near Field Communication (NFC), or the like). In this regard, the controller may additionally or alternatively be configured to communicate with at least one device via the short-range wireless communication protocol.

Abstract: An isolated switched-mode power converter converts power from an input source into power for an output load. A digital controller senses a secondary-side voltage, such as a rectified voltage, of the power converter. The secondary-side voltage is divided down using a high-impedance voltage divider. The resultant divided-down voltage is provided to a voltage sensor within the digital controller. The voltage sensor level shifts the provided voltage, and buffers the resulting level-shifted voltage. The buffered, level-shifted voltage is provided to a tracking analog-to-digital converter (ADC) for digitization. The buffered signal provided to the tracking ADC has a high current capability, such that the voltage input to the tracking ADC may quickly converge before the tracking ADC outputs a digital value for the sensed secondary-side voltage.

Abstract: The light device has USB charger has AC outlet power source and has AC-to-DC circuit to change one of Alternative current to 1st voltage DC and the 1st voltage DC though the circuit-inside or IC or DC-to-DC circuit to get 2nd voltage or though more DC-to-DC devices to get more voltage DC current. The light device has at least one of 5 Volt DC to supply to USB Charger Charging-port output-end and one of desire voltage DC to supply to DC light source. Or/The 1st AC to AC light source and has one of DC selected from 1st, 2nd, or more voltage DC current to USB Charger charging-port's output end so the said light device has (1) illumination function by DC or/and AC light source and (2) USB charger function by supply desired 1st or 2nd or more other voltage DC current to USB charging-port at 5 Volt DC. The light device optional has outlet-ports to get 1st AC directly though conductive parts to outlet-ports to supply AC to other device.

Abstract: A UPS includes a first bridge circuit module, a second bridge circuit module, and a control circuit configured to operate the first bridge circuit module as an inverter and to selectively operate the second bridge circuit module as a bypass switch and a rectifier. The control circuit may be configured to operate the second bridge circuit module as bypass switch in a standby UPS mode and to operate the second bridge circuit module as a rectifier in an on-line UPS mode.

Abstract: Systems and methods for local and master management units in a photovoltaic energy system. In one embodiment, a method implemented in a computer system includes sending a first identification code from a local management unit to a master management unit. The first identification code is associated with the first local management unit, and the local management unit controls a solar module. An authentication of the first identification code is received from the master management unit. In response to receiving the authentication, active operation of the local management unit is continued (e.g., for a set time period).

Abstract: An integral inverter, usable with a solar cell module comprising a solar cell panel, can include a terminal for inputting a DC power from the solar cell panel; a bypass diode electrically connected to the terminal; an inverter member including a direct current (DC)-alternating current (AC) inverter electrically connected to the bypass diode; a case to integrate at least one of the terminal and the bypass diode with the DC-AC inverter located therein, and attached to a back surface of the solar cell panel using an adhesive; and an AC cable for outputting AC power from the case.

Abstract: A power distribution system for a vehicle includes a switching circuit configured to selectively enable power flow between a first bus and a second bus operable within a common voltage range. The power distribution system further includes a controller programmed to, in response to power flow being inactive and a current flowing through the first bus exceeding a current threshold, operate the switching circuit to enable power flow from the second bus to the first bus.

Abstract: An apparatus comprises multiple power supply switches each including a respective power Metal Oxide Semiconductor Field Effect Transistor (MOSFET) to receive a respective one of multiple power voltages ranked incrementally from a lowest priority to a highest priority, and multiple control modules each coupled to, and configured to control, a respective one of the power MOSFETs, each control module to receive all of the power voltages having higher priorities than the power voltage received at the respective power MOSFET controlled by that control module, each control module to control the respective power MOSFET so as to turn off the respective power MOSFET if any of the higher priority power voltages are present, or permit the respective power MOSFET to turn on responsive to the respective power voltage if all of the higher priority power voltages are absent.

Abstract: The inventive technology, in certain embodiments, may be generally described as a solar power generation system with a converter, which may potentially include two or more sub-converters, established intermediately of one or more strings of solar panels. Particular embodiments may involve sweet spot operation in order to achieve improvements in efficiency, and bucking of open circuit voltages by the converter in order that more panels may be placed on an individual string or substring, reducing the number of strings required for a given design, and achieving overall system and array manufacture savings.

Abstract: The present invention relates to a method for the current control of a pulse width modulated power converter for an electric machine, in particular a pulse width modulated inverter connected to the electric machine. The machine and the inverter thereby comprise a plurality of phases, and the current control is carried out by means of a control loop comprising a modulator for the calculation of switching times for a pulse generator for producing a pulse width modulated control voltage for each phase. Furthermore, the present invention relates to a corresponding device for current control of an inverter connected to an electric machine.

Abstract: A power conversion device includes: a first smoothing circuit connected to a first electric device; a second smoothing circuit connected to a second electric device; a first bridge circuit connected to the first smoothing circuit; a transformer having a primary side connected to a third electric device and a secondary side connected to the first bridge circuit and the second smoothing circuit; and a controller, wherein the controller varies a duty ratio of the first bridge circuit at a frequency higher than cutoff frequencies of the first and second smoothing circuits, controls a constant component of the duty ratio to control power exchange between the first and second electric devices, and controls a phase of a varying component of the duty ratio to control power exchange to and from the third electric device.

Abstract: Examples herein disclose receiving a communication indicating a number of loads supported by multiple nodes and determining an amount of power available at a backup power source. Based on the determination of the amount of power, the examples disclose delivering power to the multiple nodes from the backup power source.

Abstract: The present technique discloses a buck-boost converter. According to a detailed example of the present invention, a number of switching elements of a buck-boost converter is reduced compared with a conventional buck-boost converter, and thereby a buck mode and a boost mode are performed with reduced overall conduction loss and switching loss. In addition, a buck-boost converter that is capable of stepping up and down an input voltage over a wide range using a single control device, that has a simple structure, that has inexpensive manufacturing costs, and that has a high circuit integration density can be realized by configuring the buck-boost converter to connect a two-phase interleaving boost converter unit to a single-phase buck converter unit.

Abstract: Techniques, systems, and articles of manufacture for reducing conversion losses and minimizing load via appliance level distributed storage. A method includes identifying an alternating current power source associated with a direct current-powered device, determining a storage scheme for storing direct current power, converted from alternating current power input from the identified alternating current power source, in a local storage component associated with the direct current-powered device, and managing output of direct current power to the direct current-powered device based on the storage scheme and the identified alternating current power source.

Abstract: According to aspects, embodiments herein provide a power system comprising a first Uninterruptible Power Supply (UPS) configured to operate in parallel with a plurality of UPSs, the first UPS including an input configured to receive input power, an output configured to provide output power to a load, a bypass circuit interposed between the input and output and including a bypass switch, the bypass switch positioned to couple the input and the output in a bypass mode and decouple the input and the output in an on-line mode, and a controller coupled to the first UPS and configured to monitor an input current through the bypass circuit, and control the bypass switch of the first UPS to interrupt the input current through the bypass circuit of the first UPS for a delay during the bypass mode such that each UPS provides a balanced output current to the load.

Abstract: A battery pack may include a battery cell, a cradle, a board and a housing. The cradle may be coupled with the battery cell and may include one or more guide members extending from and integrally formed with a surface of the cradle. The board may be mounted to the cradle and may include a plurality of terminal contacts electrically connected with the battery cell. The one or more guide members may be adapted to guide a device into engagement with the terminal contacts. The housing may at least partially enclose the cradle and the battery cell and may include one or more guide apertures and a plurality of terminal apertures. The one or more guide members may protrude through the one or more guide apertures. Each of the terminal apertures may be aligned with a corresponding one of the plurality of contacts.

Abstract: The disclosed apparatus may include (1) a power distribution module that (A) distributes power to a network device that forwards traffic within a network and (B) includes a series of interlock blocks keyed to (I) enable power supply modules whose electrical ratings satisfy a certain threshold to be installed to the network device and (II) prevent other power supply modules whose electrical ratings do not satisfy the certain threshold from being installed to the network device and (2) at least one power supply module that (A) has an electrical rating that satisfies the certain threshold, (B) includes a flange that is keyed to fit between the interlock blocks of the power distribution module, and when installed to the network device by way of the power distribution module, (C) provides power to the network device that forwards traffic within the network. Various other apparatuses, systems, and methods are also disclosed.

Abstract: A battery device is provided with cooling bodies for contacting the outer surfaces of a plurality of battery cells arranged inside a battery case, and spacers provided adjacent to the cooling bodies. The cooling bodies absorb or are impregnated with a cooling fluid inside the battery case. Cooling medium vapor flow channels in which cooling medium vapor circulates are formed on the surfaces of the spacers facing the cooling bodies, the cooling medium vapor being generated by the evaporation of the cooling fluid of the cooling bodies.

Abstract: In accordance with presently disclosed embodiments, uninterruptable power supplies and a method for detecting power failures for a UPS are provided. In one embodiment, the method comprises: detecting at least a portion of a waveform of a primary power input of an uninterruptable power supply; calculating at least one of a detected voltage value and a detected current value, based, at least in part, on the detected waveform by calculating at least one of a root mean square, an average, or a summation of the detected waveform; and transferring the uninterruptable power supply to a secondary power input in response to at least one of the following conditions: the detected voltage value is lower than a minimum threshold voltage value, the detected voltage value is higher than a maximum threshold voltage, or the detected current value is higher than an over current value.

Abstract: The disclosed apparatus and method is a closed loop system that obtains, stores and transfers motive energy. Preferably, the majority of the electricity generated is utilized to service a load or supplied to the grid. A portion of the electric power produced is used to recharge the batteries for subsequent use of the electric motor. The system controls and manages the battery power by controlling the charging and discharging of the battery reservoir via a series of electrical and mechanical innovations controlled by electronic instruction using a series of devices to analyze, optimize and perform power production and charging functions in sequence to achieve its purpose.

Abstract: Devices and methods for protecting against a surge in a luminaire are provided. For example, a controller for use with a luminaire is provided. The controller can include a first circuit configured to sense a surge in voltage or current. The controller can further include a second circuit configured to switch a relay in response to the first circuit having sensed the surge in voltage or current.

Abstract: Systems and methods for providing power to a refrigeration unit or an air conditioner used on a hybrid vehicle. The system includes an accumulation choke, a PWM rectifier, and a frequency inverter. The accumulation choke is configured to receive a first AC power, a second AC power, and a DC power. The accumulation choke and PWM rectifier convert the received power into an intermediate DC power having a peak voltage. The PWM rectifier provides the intermediate DC power to the frequency inverter. The frequency inverter converts the intermediate DC power to an output AC power. The frequency inverter provides the output AC power to the refrigeration unit.

Abstract: Desk top items has LED include USB-unit(s) or USB-module(s) has 2007 released specification of quickly USB Charging-port(s) has minimum 1.0 Amp to 5 Amp charging capacity to quickly charge DC current into energy-storage unit or assembly inside the other electric or digital device(s) and, optionally, additional outlet-units, to supply AC current to other electric or digital devices including smart phone, computer, communication, consumer electric products. The USB-unit(s) or USB-Module(s) or Outlet-unit(s) fit within or install on anywhere of the item's housing including anywhere of the base, pole, bar, stand, step, contour, edge, walls. The said USB charger only has charging function no any data transmit and only have one input power source not more than one and charging capacity minimum 1.0 Amp up for quickly charge from USB-Charging-ports by 2 male USB-plugs' USB-wire to the device's female USB-ports.

Abstract: A keyless entry device and method for powering the keyless entry system, such as a key fob, are disclosed. The keyless entry device has a charging battery, a rechargeable battery, at least one long range function button for a long range function, and at least one short range function button for a short range function. The method includes charging the rechargeable battery using the charging battery, wherein the rechargeable battery has a larger burst current delivery capacity than the charging battery. The method further includes sending a short range transmission from the keyless entry device using at least one of: the charging battery, and the rechargeable battery, when the at least one short range function button is actuated. The method further includes sending a long range transmission from the keyless entry device at least one of: the charging battery, and the rechargeable battery, when the at least one long range function button is actuated.

Abstract: Examples herein disclose a first power supply comprising a controller to detect a condition associated with a device. The First power supply includes a converter to modify behavior of the first power supply in response to the detected condition associated with the device.

Abstract: A single-phase five-level active clamping converter unit and a converter. The single-phase five-level active clamping converter unit has three input ends and one output end, and also comprises: a suspension capacitor and a topological control portion. The topological control portion is connected to the suspension capacitor and the three input ends and one output end of the single-phase five-level active clamping converter unit, is connected to a plurality of control ends, and is suitable for the supply of at least eight operating modes under the control of a control signal accessing the control ends. In the single-phase five-level active clamping converter unit, a topological structure is easy to design, and is simple and convenient to control.

Abstract: A power device includes an input configured to receive input power from a power source, power circuitry, a power output, a network module, and a controller. The controller is configured to operate the power circuitry to provide output power to the power output derived from the input power and to communicate with at least one primary server via the network module. In response to a determination that communication with the primary server has failed, the controller is configured to attempt communication with a domain name server. In response to a determination that communication with the domain name server has failed, the controller is configured to identify that the network has failed.

Abstract: A method protects an electrical generator or power station unit connected to a power distribution network or to a power transmission line. A short circuit near the generator in the power distribution network or on the power transmission line is detected, and a short-circuit detection signal is generated, when a set of predetermined trigger conditions is satisfied. The electrical generator is disconnected from the network or line if, after generation of the short-circuit detection signal, the trigger conditions are satisfied at the instant when a predetermined delay time elapses, and have remained satisfied until the predetermined delay time elapses. The delay time is a variable duration which is reestablished regularly or irregularly before it elapses, as a function of the operating profile after the short-circuit occurrence, and the generator is disconnected if the trigger conditions are satisfied at the instant when the delay time elapses.

Abstract: Channel switchover power multiplexer circuits, and methods of operating the same are disclosed. An example power multiplexer a first transistor coupled to a first input, a second transistor coupled to the first transistor to couple a first voltage at the first input to an output, a third transistor coupled to a second input, a fourth transistor coupled to the third transistor to couple a second voltage at the second input to the output, a diode amplifier to provide a third voltage to a gate of the first transistor to block a reverse current, and a soft-start amplifier to provide a fourth voltage to a gate of the fourth transistor to turn on (with adjustable VOUT ramp rate) the fourth transistor with a constant ramp rate.

Abstract: A method of supplying power to multiple electronic devices that are grouped within a specific space that uses a multiport power supply to manipulate the voltage and amperage that goes to each electronic device. The method will use a multiport power supply that comprises of and AC/DC power supply, a distribution board that attached to the AC/DC power supply, at least one power adjustment circuit and wherein the power adjustment circuit comprises a voltage regulator, a voltage selector, and at least on DC output port.

Abstract: Various embodiments include a hybrid energy system that includes a combined cycle gas-turbine (CCGT) generator system configured to provide a up to a full-load power output and an energy storage device configured to store energy, and methods of operating such hybrid energy systems. A hybrid energy system includes a CCGT generator system configured to provide up to a full-load power output and a storage device for storing electric energy. The hybrid energy system includes a generator step-up transformer, in which the turbine generator, steam turbine generator and the storage device are electrically co-located on a low side of the step-up transformer. Methods of operation include controlling power output from the storage device and/or the CCGT system so that total power output by the CCGT system exhibits responses to up-power and down-power demand transients as if the system were a gas turbine-only power system.

Abstract: A method of synchronization comprises receiving, at a first generator set, data indicating a characteristic for a component of a voltage for a source, and receiving, at a second generator set, the data indicating the characteristic for the component of the voltage for the source. The method also includes calculating, by each of the first and second generator sets, a speed offset parameter and a voltage offset parameter based on the received data. The first and second generator sets are configured to receive the same data indicating the component and independently calculate the same speed offset parameter and voltage offset parameter. The method further includes controlling operation of the first and second generator sets based on the calculated speed offset and voltage offset parameters.

Abstract: Various embodiments include a hybrid energy system that includes a combined cycle gas-turbine (CCGT) generator system configured to provide a up to a full-load power output and an energy storage device configured to store energy, and methods of operating such hybrid energy systems. A hybrid energy system includes a combined cycle gas turbine generator system configured to provide up to a full-load power output and a storage device for storing electric energy. The hybrid energy system includes a generator step-up transformer, in which the turbine generator, steam turbine generator and the storage device are electrically co-located on a low side of the step-up transformer. Methods of operation include controlling power output from the storage device and/or the CCGT to function as a spinning reserve during scheduled and unscheduled grid power demands to achieve economic and environmental performance advantages, and maintaining a charge state in the storage device.

Abstract: A method is provided, repeated over successive time slots, for controlling the distribution of power from a time varying renewable power source between a battery and a power grid. The method comprises comparing the maximum input power of a battery with the power output of the time varying power source and determining a ratio for distributing the power between the battery and the power grid based on the comparison. Wherein distributing the output power to the energy storage device as a priority when the output power of the power source is below the maximum input power of the energy storage device; and increasing the ratio for the grid and decreasing the ratio for the energy storage device as the output power of the power source increases above the maximum input power of the energy storage device. The surplus power produced by the power source, above the maximum input power of the energy storage device, is discarded when the output power is distributed to the energy storage device.

Abstract: The present invention relates to a station auxiliary power source apparatus that converts power supplied from an overhead cable to generate power to be supplied to a load in a station. The station auxiliary power source apparatus includes a first average calculation unit that calculates the average value of the overhead cable voltage for every predetermined time period; a second average calculation unit that calculates, two or more times, an average value of the overhead cable voltage that is larger than a first average value of the average value among the overhead cable voltages; a third average calculation unit that calculates an average value of the overhead cable voltage per day; and a comparator that selects any one of a second average value of the average value and a third average value of the average value and sets the selected value as the threshold value.

Abstract: A power supply system includes an energy storage device electrically connected to a power grid, a power distribution assembly electrically connected to a load, and a power generation device electrically connected to the power distribution assembly. The energy storage device and the power grid are configured to supply electric power having a first voltage range to the power distribution assembly, which in turn, is configured to supply electric power having a second voltage range less than the first voltage range to the load. The energy storage device and the power generation device each are configured to at least temporarily supply a flow of electric power to the power distribution assembly when electric power from the power grid is interrupted such that a substantially uninterrupted flow of electric power is supplied to the load.

Abstract: A hydraulic system includes a hydraulic circuit with a hydraulic component. A sensor is provided for sensing a characteristic of the hydraulic component. An energy harvester is configured to harvest energy from the hydraulic circuit. An energy combiner receives power outputs from the energy harvester and a battery, and is configured to selectively power the sensor from at least one of the battery and the energy harvester in response to a predetermined condition.

Abstract: A power converting device converts any of DC voltages outputted from at least two DC power supplies and outputs a converted voltage. A control unit of the power converting device determines whether a first contact and a second contact of a switch are melted and joined together based on a detection signal, before a second DC power supply outputs a second DC voltage.

Abstract: A power conditioner (12) includes a detector (15) and a controller (19). The detector (15) detects electrical output of each of a plurality of photovoltaic cell modules (11). The controller (19) compares a change over time in the electrical output detected by the detector (15) with a threshold. When the change over time exceeds the threshold for a plurality of photovoltaic cell modules (11) and the photovoltaic cell modules (11) are in a predetermined positional relationship, the controller (19) causes the photovoltaic cell modules (11) to perform a maximum power point search.

Abstract: An electronic device includes a power switch configured to receive a voltage on a first terminal. The first terminal is coupled to a voltage regulator. The power switch is also configured to provide the voltage to a second terminal. The second terminal is coupled to a VBUS terminal of a Universal Serial Bus Type-C (USB-C) connector. The electronic device also includes a protection circuit comprising a comparison component coupled to the first terminal and the second terminal. The comparison component is configured to detect a first voltage at the first terminal detect a second voltage at the second terminal. The protection circuit is configured to determine whether the second voltage is within a threshold voltage of the first voltage and adjust operation of the power switch in response to determining that the second voltage is within the threshold voltage of the first voltage.

Abstract: An power supply apparatus includes a first power supply unit configured to wirelessly supply power based on a first power supply method, a second power supply unit configured to wirelessly supply power based on a second power supply method different from the first power supply method, a communication unit configured to communicate with an electronic device, a selection unit configured to select one of the first and second power supply units based on a communication with the electronic device, and a control unit configured to perform a process to wirelessly supply power to the electronic device using the selected power supply unit, wherein the control unit controls the selection unit to select one of the first power supply unit and the second power supply unit depending on a state of the electronic device.