Abstract: In an uninterruptible power supply device for supplying DC power to a load, a control device is configured such that, when the load is performing power running operation, the control device turns on a second switch to supply DC power from a diode rectifier to the load, turns off a first switch, and controls a converter to suppress a harmonic current contained in an AC current flowing from an AC power supply to the diode rectifier, and when the load is performing regenerative operation, the control device turns off the second switch, turns on the first switch, and controls the converter to convert regenerative power generated by the load into AC power.

Abstract: Disclosed is a method of determining a magnetic resonant condition for a multi-device wireless power transfer system. A magnetic resonant condition determining method may determine a resonant condition based on a charge state, for example, a number of charging devices and a relative position between charging devices, for a multi-transmitter/receiver of a wireless power transfer system.

Abstract: An integrated circuit includes an integrated circuit interface, a wireless communications circuit, a selection circuit, and a control circuit. The integrated circuit interface includes a plurality of power supply input terminals, a plurality of power delivery terminals, and an energy harvest output terminal. The wireless communications circuit is configured to harvest energy received in a wireless communications signal and to provide harvested energy to the energy harvest output terminal. The selection circuit is coupled to the integrated circuit interface and is configured to selectively provide power to the plurality of power delivery terminals based on power received from the plurality of power supply input terminals in response to a control signal. The control circuit is configured to generate the control signal based on a first level of the harvested energy, any signals received on the plurality of power supply input terminals, and predetermined rules.

Abstract: The present disclosure describes techniques for detecting foreign objects by detecting changes in an electrical characteristic of an array of sense elements for detection objects based on a current measurement approach. In some aspects, an apparatus for measuring changes in current for detecting objects is provided. The apparatus includes a plurality of sense circuits each comprising a sense coil, the plurality of sense circuits each electrically connected to a common output node. The apparatus further includes a driver circuit electrically connected to the plurality of sense circuits and configured to operate as a voltage source and selectively apply a voltage signal at an operating frequency to each of the plurality of sense circuits. The apparatus further includes a current measurement circuit electrically connected to the common output node. The current measurement circuit is configured to provide a measurement output proportional to an electrical current at the common output node.

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: The present disclosure is directed to preventing serious injury or death by electrocution due to contact with a power source, such as an alternating current (AC) voltage source. Methods and apparatus consistent with the present disclosure may controllably provide an electrical voltage to an electrical conductor for a period of time and then remove that voltage from the electrical conductor before providing the electrical voltage to the electrical conductor a second time. By initially connecting the electrical voltage to the conductor, then removing that electrical voltage from the conductor before re-connecting that electrical voltage to the conductor, methods and apparatus consistent with the present disclosure allow a person to let go of the electrical conductor before the person is seriously injured or killed by an electrical shock in an instance where the body of the person is in physical contact with the electrical conductor.

Abstract: Inductive power transfer apparatus has a first magnetic coupling structure and a second magnetic coupling structure, the structures being adapted to generate and/or receive magnetic flux to thereby transfer power inductively, the first structure comprising a substantially circular coil, and the second magnetic structure comprising an arrangement of at least two coils associated with a magnetically permeable core.

Abstract: A power transmitting device transmits power to a power receiving device having a power receiving coil, in water. The power transmitting device includes one or more annular transmitting coils including a power transmitting coil configured to transmit the power to the power receiving coil via a magnetic field, a support member located in an inner space of the transmitting coil, which is formed by the annular transmitting coil, the support member including an outer periphery along an inner periphery of the annular transmitting coil, and supporting the transmitting coil from the inner space, a power transmitting unit configured to supply A/C power to the power transmitting coil, and a capacitor connected to the transmitting coil, and forming a resonance circuit resonating together with the transmitting coil.

Abstract: A system, an apparatus, and a method for wireless power transfer are provided. The system includes a plurality of wireless power transmitters and at least one receiver. The at least one receiver is configured to receive the power wirelessly transmitted at least one wireless power transmitter of the plurality of wireless power transmitters. The plurality of wireless transmitters is configured to wirelessly transmit power. Each wireless power transmitter is positioned at a different location and/or orientation. Each wireless power transmitter is an active power source or a passive relay power source. The one or more wireless power transmitters are identified for power transmission based on a plurality of factors including at least presence of obstacles in transmission paths.

Abstract: Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.

Abstract: An electronic device performs an emergency call operation using a secondary battery as a power source, and includes a temperature sensor which detects a temperature of the secondary battery, an intermittent emergency call processing unit which performs the emergency call operation intermittently when the temperature detected by the temperature sensor is in a low-temperature state lower than a predetermined value, and a continuous emergency call processing unit which performs the emergency call operation continuously when the temperature detected by the temperature sensor is higher than the predetermined value.

Abstract: A large-scale photovoltaic direct current (DC) series boost grid-connected system with a power balancer, including N photovoltaic DC converters and N?1 power balancers, wherein N?2. The output ends of the photovoltaic DC converters are connected successively in series and then connected to the DC grid, and the input ends of the photovoltaic DC converters are respectively connected to the output ends of the photovoltaic power generation unit. Among the photovoltaic DC converters, which are arranged successively in series, a power balancer is disposed between the input ends of two photovoltaic DC converters adjacent to each other. The N?1 power balancers are arranged corresponding to the set N?1 photovoltaic DC converters respectively to balance the input power of the corresponding photovoltaic DC converter, thereby eliminating a difference between the output voltages of the photovoltaic DC converters.

Abstract: A power transfer device comprises a power transfer coil; a case that has a surface extending along a direction perpendicular to an axial direction of the power transfer coil and stores the power transfer coil; a rotating shaft rotatable about the shaft that extends in the axial direction of the power transfer coil at a central portion in a radial direction of the power transfer coil and has an end penetrating the surface and protruding outward through the surface; a foreign object remover that projects outwardly from the end of the rotating shaft in a radial direction of the rotating shaft and moves on the surface; a driving source that provides the rotating shaft with power; and a processor that determines whether or not a vehicle is present. The driving source is driven if the processor determines that the vehicle is present.

Abstract: A surface with various layers that provide wireless charging may include at least one of a top surface layer, a second layer, comprising a plurality of lights and a power grid, disposed under the top surface layer, a charging pad disposed on a portion of the power grid, and a third layer, comprising a power supply which provides power to the plurality of lights and the power grid, disposed under the second layer.

Abstract: A medium and high voltage energy conversion system is provided. An input terminal of each of high-voltage isolated DC/DC converters in a phase circuit of the system is connected to a common DC bus. Each of the high-voltage isolated DC/DC converters converts, based on an open-loop control strategy or a closed-loop control strategy, a DC input voltage of a cascade module connected to the high-voltage isolated DC/DC converter into an instruction value related to a voltage of the common DC bus. A system controller of the system calculates, based on at least a voltage-current double loop control strategy, a three-phase modulation instruction to be sent to the cascade modules in three phases according to a parameter related to the voltage of the common DC bus, to implement grid-connected control on three phase circuits.

Abstract: An electronic device and method for wirelessly receiving power are provided. The electronic device includes a wired power interface; a power receiving circuit; and a control circuit configured to control the power receiving circuit to wirelessly receive power from a wireless power transmitting device; and provide the received power to an external electronic device through the wired power interface.

Abstract: A wireless power receiving apparatus includes a receiving resonator configured to wirelessly receive energy; a resonant converter configured to transfer, to an output end of the wireless power receiving apparatus, energy of an energy storage device connected among a plurality of energy storage devices; and a controller configured to accumulate, alternatingly in the energy storage devices, the energy received, and select the energy storage device to be connected to the resonant converter from the energy storage devices.

Abstract: In one or more particular implementations, a plurality of energy harvesting cells are provided, wherein each cell comprising a substrate supporting a least one electrical energy generating device, at least one control circuit for controlling at least the operation of the electrical energy generating device, wherein the energy harvesting cell is encased in a polymer Wherein the substrate has two opposing first sides each having a length L, a second side orthogonal to both first sides having a length equal to 2L, a third side opposed from the second side having a length of 4L, wherein the width of the substrate between the two opposing first sides is 8L.

Abstract: Provided is an electronic control unit, which includes a printed wiring board on which a semiconductor element is mounted, including a power supply pattern and a ground pattern which are formed on the printed wiring board and connected to the semiconductor element, at least one capacitance adjustment pattern which is formed on the printed wiring board, and a connection portion which is provided for each capacitance adjustment pattern and able to switch electrical connection between either the power supply pattern or the ground pattern and the capacitance adjustment pattern.

Abstract: An energy supply device to supply electrical energy for a motor vehicle, having a power grid connector for connection of the energy supply device to an alternating current power grid, having at least one first connecting device for producing a cabled electrical connection between the power grid connector and the motor vehicle, and having at least one second connecting device for producing a cableless electrical connection between the power grid connector and the motor vehicle. The first connecting device and the second connecting device are connected to the power grid connector via a common rectifier device.