Abstract: An apparatus and method of locating a wireless power transmitter in which a variable load coupled to a wireless power receiver configured to receive a wireless power signal from the wireless power transmitter is controllably varied to maintain a harvested voltage of the wireless power signal within a predetermined range. By doing so, power supplied to a wirelessly powered appliance coupled to the wireless power receiver is maintained within an operational envelope of the wirelessly powered appliance.

Abstract: A power supply system comprising: a first converter module comprising an AC/DC converter and being arranged to produce an intermediate voltage from an input voltage; a second converter module comprising a DC/DC converter and being controllable to use the intermediate voltage to produce selectively at least two distinct output voltage levels; and a control unit arranged to acquire a flight parameter representative of the flight phase and/or of the altitude, and to control the power supply system in such a manner that the second converter module delivers to each electrical system a power supply voltage that depends on the flight parameter and on said electrical system, and that is equal to one of the output voltage levels.

Abstract: A power system operable to implement a power balancing control scheme is provided. In one aspect, a power system includes multiple independent power supplies with independent batteries feeding onto a common power bus. The power supplies regulate the voltage on the common power bus at the same time. The power balancing control scheme, when implemented, causes the load on the common power bus to be shared among the individual power supplies with a specified load distribution. The specified load distribution can be set or determined to balance the State of Charge (SoC) of the batteries over time whilst taking into account the constraints or limits of the elements of the power system.

Abstract: A user-friendly construction machine system with shorter installation work time and wiring work time is provided. The construction machine system includes a rotary crusher unit and a feeding conveyor unit. The feeding conveyor unit is different from the rotary crusher unit. The feeding conveyor unit includes a third power reception device that receives power from the rotary crusher unit by a wireless power supply and a second motor that receives the power from the third power reception device via a wire.

Abstract: A device for DC-DC conversion includes a plurality of input ports to receive a set of DC voltage inputs, at least one DC voltage input being configured as a differential input, a plurality of input semiconductor switches, each input semiconductor switch being coupled to a respective input port of the plurality of input ports, an inductor coupled to each input semiconductor switch, a pair of output semiconductor switches coupled to the inductor, an output coupled to the inductor via the pair of output semiconductor switches, and a processor configured to generate input switch control signals for the plurality of input semiconductor switches to sequentially and selectively connect each DC voltage input to the inductor to charge the inductor and to generate an output switch control signal for the pair of output semiconductor switches to connect the inductor to the output to discharge the inductor via the output.

Abstract: A wireless power transmitter circuit includes: an inverter circuit including plural switches coupled to a resonant transmitter circuit; and a transmitter controller circuit for generating a PWM control signal, to control the plural switches, thus generating a wireless transmission power via the resonant transmitter circuit in a power supply procedure, so that a wireless power supply is accordingly provided to a wireless power receiver circuit. In a groping procedure, transmitter controller circuit controls the plural switches to generate a wireless test power via the resonant transmitter circuit based on an operation frequency. The groping procedure includes: measuring a peak of a transmission signal corresponding to the wireless test power; determining, according to the peak of the transmission signal, whether a foreign object exists and/or whether the wireless power receiver circuit is present.

Abstract: A wireless power transmitter circuit includes: a power stage circuit including plural switches coupled to a resonant transmitter circuit, wherein the resonant transmitter circuit includes a transmission coil and a resonant capacitor which are coupled to each other; and a transmission control circuit controlling the power stage circuit to convert an input power to a driving power according to a pulse width modulation (PWM) control signal when a corresponding wireless power receiver circuit is near by the resonant transmitter circuit. The driving power drives the resonant transmitter circuit to generate a wireless transmitting power, which is supplied to the corresponding wireless power receiver circuit. When a variation rate of a driving current of the driving power with respect to time exceeds a variation rate threshold, an operation parameter of the power stage circuit is adjusted to reduce a power level of the wireless transmitting power.

Abstract: A system includes a first sense circuit configured to provide a first output representative of sensed current provided by a first battery coupled to a first load. A second sense circuit is configured to provide a second output representative of sensed current provided by a second battery coupled to the first load. An input current controller is coupled to receive the respective first and second outputs and to couple between the second battery and the first load to control the current provided by the second battery.

Abstract: A first current detector detects an output current of a modular uninterruptible power supply apparatus. Each of a plurality of power conversion modules includes a resistive element and a second switch. The second switch connects the first current detector and the resistive element in parallel in an ON state. Each of first control circuits turns on the second switch when setting a corresponding power conversion module to an operating state, and turns off the second switch when setting the power conversion module to a stopped state. Each of the first control circuits detects a shared current of the corresponding power conversion module based on a current flowing through the resistive element when the second switch is in the ON state. Each of the first control circuits controls a power converter such that an output current of the power conversion module matches the shared current.

Abstract: A method of supplying power to an electrically isolated wind farm is provided including a plurality of wind turbines and a power generator. In a low wind condition, where a wind speed falls below a threshold value, active power and reactive power is supplied from the power generator to a first wind turbine and wind farm passive components. In a second operation mode after the first operation mode, active power is supplied from the power generator to the first wind turbine and a second wind turbine, and reactive power is supplied/consumed by the first wind turbine to the cables and transformers between it and the second wind turbine.

Abstract: A power supply system includes: a power transmission circuit provided on the ground side; a high frequency generation circuit that supplies high-frequency electric power to the power transmission circuit; a measurement unit that measures a physical quantity corresponding to the degree of coupling between the power transmission circuit and a power reception circuit provided in a vehicle; and a control unit. When the degree of coupling is determined, based on the measured physical quantity, to be lower than a predetermined degree, the control unit sets the impedance of the power transmission circuit to a first impedance and thereby sets the power transmission circuit to a non-resonant state. In contrast, when the degree of coupling is determined to be not lower than the predetermined degree, the control unit sets the impedance of the power transmission circuit to a second impedance and thereby sets the power transmission circuit to a resonant state.

Abstract: A power transmitter (101) comprises a driver (201) generating a drive signal for a transmitter coil to generate a power transfer signal during a power transfer time interval and an electromagnetic test signal during a measurement time interval. A set of balanced detection coils (207, 209) comprise two detection coils arranged such that signals induced in the two detection coils by an electromagnetic field generated by the transmitter coil compensate each other. An estimation circuit (205) determines a position/coupling factor estimate for the power receiver (105) in response to signals from the plurality of sets of balanced detection coils (207, 209) during the at least one measurement time interval.

Abstract: A primary resonant coil (22) and a secondary resonant coil (23) are different in the proposed improved coreless power transformer design, wherein the differences between the two resonant coils are achieved in two ways: (1) in the first difference, the two resonant coil windings are made to be different; for example, to have different number of turns, turn spacing and/or different wire sizes, and (2) the second difference is with the capacitance values of the two parallel capacitors each used to resonate their respective coils.

Abstract: A portable power supply including an internal power source, an AC output, a DC output, and an input unit configured to receive power from a first external source. The portable power supply further includes a first power conversion unit configured to convert the power received from the first external source to a first DC power used for charging the internal power source, an AC power conversion unit configured to convert power output by the internal power source to an AC power used for powering a first peripheral device connected to the AC output, and a DC power conversion unit configured to convert power output by the internal power source to a second DC power used for powering a second peripheral device connected to the DC output.

Abstract: A hydraulic shovel is provided with a lower travelling body and an upper revolving body revolvably disposed on the lower travelling body. The hydraulic shovel is also provided with a motor disposed on the upper revolving body for driving the hydraulic shovel, a first battery unit disposed on the upper revolving body, a second battery unit disposed on the lower travelling body, and a power supplier that supplies external power to the first battery unit and the second battery unit.

Abstract: Acoustic resonator devices and filters are disclosed. An acoustic resonator includes a substrate having a surface. A back surface of a single-crystal piezoelectric plate is attached to the surface of the substrate except for a portion of the piezoelectric plate forming a diaphragm spanning a cavity in the substrate. An interdigital transducer (IDT) is formed on a front surface of the piezoelectric plate with interleaved IDT fingers of the IDT disposed on the diaphragm. Back-side fingers are formed the back surface of the diaphragm.

Abstract: A hybrid energy system is configured to carry a power load for a generator configured to output a first AC signal. The hybrid energy system includes a battery bank, a DC/DC converter, an AC/DC converter, and a DC/AC converter. The battery bank includes a plurality of batteries and outputs a first DC signal. The DC/DC converter, operating in a first mode, receives and converts the first DC signal into a second DC signal, which is output to a DC bus. The AC/DC converter receives and converts the first AC signal into a third DC signal. The second DC signal and the third DC signal are tied together on the DC bus. The DC/AC converter receives and converts the second DC signal from the DC bus into a plurality of second AC signals, which are output to an AC outlet interface.

Abstract: The backup power supply apparatus is an apparatus that supplies power to a power-supply target apparatus operating by power supply from an external power source when a power supply state of the external power source is emergency. The backup power supply apparatus includes: a power storage section; a series regulator that is located on a line connecting the power storage section and the power-supply target apparatus; and control circuitry that changes an output voltage of the series regulator in multiple stages in accordance with a change in the power supply state of the external power source and a change in a voltage of the power storage section.

Abstract: A wireless power transmitter is configured to (i) send, to an external power supply, a request that the external power supply change a configurable voltage level of a supply voltage signal for the wireless power transmitter from a first voltage level to a second voltage level, (ii) after detecting that the external power supply has changed the configurable voltage level of the supply voltage signal from the first voltage level to the second voltage level, causing a configurable frequency of a drive signal for the wireless power transmitter to be changed from a first frequency to a second frequency, (iii) produce a wireless power signal for receipt by a wireless power receiver in accordance with an alternating current signal that (a) has the second frequency and the supply voltage signal having the second voltage level and (b) is produced by a power conditioning system of the wireless power transmitter.

Abstract: A system power supply structure comprising: a power supply source; a plurality of systems each requiring a predetermined functional safety; and a plurality of relays inserted between the power supply source and the plurality of systems, wherein a system requiring the same functional safety among the plurality of systems is connected in parallel to the same relay among the plurality of relays.