Abstract: The embodiments described herein comprise a distributed wireless power transmission system including a plurality of wireless power transmission systems (WPTSs) coordinating transmissions to create a virtual WPTS. The plurality of WPTS coordinate amongst each other to compensate for local phase shift differences between respective clock sources so that transmissions from the WPTSs constructively interfere at a wireless power receiver client (WPRC).

Abstract: A power transmitter for wireless power transfer includes a control and communications unit, an inverter circuit, a coil, and a shielding. The control and communications unit is configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver, provide a power request to an external power supply, determine if a power signal at the coil is compliant with the power request, and, if the power signal at the coil is compliant with the power request, continue to operate for wireless power transmission. The coil is configured to transmit the power signal to a power receiver. The shielding comprises a ferrite core.

Abstract: A contactless device includes an impedance matching and filter circuit connected to an antenna and being on the one hand operable for contactlessly communicating with a second device via the antenna, and on the other hand operable for contactlessly charging a rechargeable power supply of a third device via the antenna. A method of control includes modifying the impedance matching and filter circuit of the contactless device depending on whether the contactless device carries out the contactless communication or carries out the contactless charging.

Abstract: A wireless power transmitter may receive a request from a wireless power receiver to perform recalibration for a first type of foreign object detection (FOD) in response to the wireless power receiver attempting to change an electromagnetic parameter supplied by the wireless power transmitter. In response to receiving the request, the wireless power transmitter may perform a second type of FOD to produce a FOD result. When the FOD result indicates a foreign object is present or likely present, the wireless power transmitter may discontinue or limit wireless power transfer, and/or communicate the FOD result to the wireless power receiver. When the FOD result indicates a foreign object is not present or likely not present, the wireless power transmitter may communicate the FOD result to the wireless power receiver, perform the recalibration and continue with wireless power transfer.

Abstract: A self-powered wireless keyboard by modifying the structure of a traditional membrane keyboard having a volcanic crater structure. Not damaging the original membrane keyboard structure, a micro magnet core is installed inside a cylindrical protrusion block under the key cap as a mover of the induction power generation device, and an induction coil is wound in a key slot of the keyboard base as the stator of the induction power generation device. In this way, when each key is pressed, it will produce induction current. A layer of flexible solar cell can be laid on the upper surface of the key, which can generate electricity by collecting the light energy in the surrounding environment during the time of daily illumination.

Abstract: A method is provided for operating a device for wireless transfer of energy in the direction of an electrical consumer via inductive coupling. The method involves sequentially carrying out a power transfer, a data exchange, a measurement of setup parameters, and a measurement of a resonance frequency, wherein during the power transfer, an electrical actual power emitted by an inverter is regulated to a predetermined electrical setpoint value, wherein during the data exchange, data are exchanged between the device and the electrical consumer via a communication unit, wherein during the measurement of the setup parameters, objects possibly arranged over a power coil are detected, wherein during the measurement of the resonance frequency, a resonance frequency of a resonant circuit having the power coil is ascertained, and wherein the measurement of the resonance frequency is executed immediately before or immediately after the measurement of the setup parameters or the data exchange.

Abstract: A power transmitter for wireless power transfer includes a verification load, a control and communications unit, an inverter circuit, a coil, and a shielding. The control and communications unit is configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver, provide a power request to an external power supply, determine if a power signal at the verification load is compliant with the power request, and, if the power signal at the verification load is compliant with the power request, continue to operate for wireless power transmission. The coil is configured to transmit the power signal to a power receiver. The shielding comprises a ferrite core.

Abstract: A wireless power supply power supply including first tuning circuitry coupled directly to a transmitter, the first tuning circuitry including an LCC configuration. The wireless power supply may include second tuning circuitry coupled directly to switching circuitry (e.g., an inverter) of the power supply, where the second tuning circuitry may be operable to direct power from the switching circuitry to the first tuning circuitry for supply to the transmitter, and where the second tuning circuitry includes a reactance operable to establish inductive operation of the switching circuitry at the switching frequency of the switching circuitry.

Abstract: A power supply circuit includes a charge system circuit and a discharge system circuit. The charge system circuit charges a battery based on power received by a power receiving unit. The discharge system circuit supplies power to a power supply target device based on a battery voltage from the battery. The discharge system circuit includes a power supply circuit and a power-off setting circuit. The power supply circuit supplies power to the power supply target device based on the battery voltage. The power-off setting circuit sets the power supply circuit to a power-off state when it is detected that a non-input state of the battery voltage to the discharge system circuit is changed to an input state of the battery voltage to the discharge system circuit, and releases the power-off state after the power receiving unit starts receiving power.

Abstract: A contactless power feeding system includes: a power converter which converts DC power from a DC power supply, to AC power; a power transmission electrode to which AC power converted by the power converter is applied; a power reception device having a power reception electrode, receiving power through capacitive coupling between the power transmission and reception electrodes, and feeding power to a load; a voltage detection unit which detects voltage of the power transmission electrode; and a control unit which controls the DC power supply or the power converter using voltage detected by the voltage detection unit. The voltage detection unit has a voltage detection electrode and detects voltage of the power transmission electrode through capacitive coupling between the power transmission electrode and the voltage detection electrode.

Abstract: A remote-controlled switch cover assembly is described for converting an existing rocker switch into a remote-controlled switch. The remote-controlled switch cover assembly receives a wireless signal to actuate the existing rocker switch and, in response, activates an electric motor that causes a gear train to turn in a first direction. This causes a wiper to engage an under-surface of a tilt plate located above the existing rocker switch and, in response, an opposing end of the tit plate depresses the existing rocker switch.

Abstract: A method for controlling an electric load is described herein. In accordance with one embodiment the method includes collecting ambient energy using an energy harvesting circuit and using the collected ambient energy to charge a buffer capacitor. The method further includes alternatingly connecting and disconnecting an electrical load and the buffer capacitor, wherein a capacitor voltage provided by the buffer capacitor is applied to the electrical load in a discharging phase, in which the electrical load is connected to the buffer capacitor and the capacitor voltage decreases, and wherein the buffer capacitor is recharged in a charging phase, in which the electrical load is disconnected from the buffer capacitor in a charging phase in which the capacitor voltage again increases. The durations of the charging phase and the discharging phase are designed such that the capacitor voltage stays above a minimum supply voltage of the electrical load.

Abstract: Disclosed herein are methods and systems for controlling an active rectifier of a wireless power receiver. The exemplary methods can include determining a reference value of a current into the rectifier, the reference value being based on a load requirement; determining a required value change in a present input current into the rectifier based on the reference value; transmitting, to a wireless power transmitter, a signal representative of the required value change in the present input current; determining a new value of the present input current after transmitting the signal; and, when the new value is within a predetermined range of the required value change, driving at least one transistor in the rectifier with a PWM signal based on the new value.

Abstract: The present disclosure provides wireless power transfer systems and methods. One such system includes a transmitter comprising a transmitter coil coupled to a power source and a transmitter metasurface slab positioned on a front side of the transmitter coil that is configured to amplify and focus a magnetic field generated by the transmitter coil towards a receiver in a non-contact manner. In such a system, the receiver comprises a receiver coil coupled to a load and a receiver metasurface slab positioned on a front side of the receiver coil configured to amplify and focus a magnetic field generated by the transmitter coil towards the receiver coil in a non-contact manner. Other systems and methods are also provided.

Abstract: A power management apparatus 20 comprises: a plurality of energy harvesting input channels 21-24; a first energy storage element connection for connecting to an energy storage element 32; an inductor connection 27; and a switching circuit 28. A controller 30 operates the switching circuit to transfer energy between the energy harvesting input channels 21-24 and the first energy storage element connection 25 by a sequence of energy transfer cycles. Each energy harvesting input channel 21-24 is allocated a plurality of the energy transfer cycles. The controller 30 determines operating parameters for operating the switching circuit 28 which transfer a maximum power from the electrical energy harvesting source connected to the energy harvesting input channel and a maximum power inductor utilisation factor. The controller 30 determines a set of adjusted operating parameters for sharing use of the inductor between the plurality of energy harvesting input channels 21-24.

Abstract: An apparatus in which electric power is generated for an electrical load from differentials in electric field strengths within a vicinity of powerlines includes: a plurality of electrodes separated and electrically insulated from one another for enabling differentials in voltage resulting from differentials in electric field strength experienced there at; and electrical components electrically connected therewith and configurable to establish one or more electric circuits whereby voltage differentials cause a current to flow through the established electric circuit for powering the electrical load.

Abstract: Provided is a back-data transmission circuit generating a sensing signal using an arbitrary sensor, generating an input signal by digitally converting the sensing signal, generating a modulation signal by performing a modulation operation when there is a change in the input signal, inducing the modulation signal and transmitting the modulation signal to the transmitting terminal, measuring an induction signal induced from a receiving terminal to the transmitting terminal, and generating an output signal by calculating a slope of a voltage change represented by the induction signal.

Abstract: A wireless charging device includes a casing, a circuit board and at least one wireless charging module. The casing includes a bottom plate and a plurality of mounting pillars protruding from the bottom plate. The circuit board includes a substrate and at least one support assembly, and the substrate is stacked on the plurality of mounting pillars. The support assembly includes a plurality of support pillars protruding from the substrate. The wireless charging module includes a mounting frame and a charging coil. The mounting frame has a plurality of first assembling parts. The plurality of first assembling parts are respectively mounted on the plurality of support pillars. The charging coil is disposed on the mounting frame. Projections of the plurality of mounting pillars on the bottom plate at least partially overlap projections of the plurality of support pillars on the bottom plate.

Abstract: A converter and a circuit device including the converter are disclosed. The converter includes an inductor including a first end and a second end, and a switching circuit connected to the inductor. The switching circuit includes a first switch to control a connection between the first end and a battery connected to the converter, a second switch to control a connection between the second end and a current output end configured to output a current generated through the inductor from the battery, a third switch to control a connection between the second end and a voltage output end configured to output a voltage generated from the battery, and a fourth switch to control a connection between the second end and a voltage input end configured to receive a voltage to charge the battery.

Abstract: A power transmission apparatus includes a first switching element having a first and a second terminal, a first capacitor connected between the first terminal and the second terminal of the first switching element, and a power transmission inductor connected to the first switching element on a direct-current (DC) basis and configured to wirelessly transmit alternating-current (AC) power.