Abstract: An electronic apparatus may include an electrically conductive body configured to magnetically couple to a first magnetic field. A first tuning element may be connected to the electrically conductive body. An electrically conductive coil may be wound about an opening defined by the electrically conductive body, and configured to magnetically couple to a second magnetic field.

Abstract: Exemplary embodiments are directed to a power controller. A method may include comparing a summation voltage comprising a sum of an amplified error voltage and a reference voltage with an estimated voltage to generate a comparator output signal. The method may also include generating a gate drive signal from the comparator output signal and filtering a signal coupled to a power stage to generate the estimated voltage.

Abstract: Systems and methods for converting voltages between different voltage levels in a receiver are disclosed. In an aspect, a wireless power receiver apparatus for charging a chargeable device is provided. The apparatus includes a plurality of receive antennas disposed on a cover of the chargeable device, wherein at least one of the plurality of receive antennas is configured to wirelessly receive power according to a wireless charging protocol different from at least one other of the plurality of receive antennas. The apparatus includes a switching circuit disposed on the cover and configured to receive the wireless power from at least one of the plurality of receive antennas and selectively provide a respective voltage from a corresponding one of the plurality of receive antennas across an output configured to be connected to an input of the chargeable device.

Abstract: An apparatus for wirelessly receiving power via a wireless field generated by a transmitter includes a resonator configured to generate electrical current to power or charge a load based on a voltage induced in the resonator in response to the wireless field, at least one variable capacitor electrically coupled to the resonator and configured to adjust a first capacitance of the at least one variable capacitor responsive to a first control signal, and a control circuit configured to adjust and apply the first control signal to the at least one variable capacitor to simultaneously adjust a resonant frequency of the resonator and a current output to the load based on an electrical characteristic indicative of a level of power output to the load.

Abstract: Disclosed is an electronic device comprising a plurality of power receiving elements. Each power receiving element may be configured to electromagnetically couple to an externally generated magnetic field to receive power wirelessly. A plurality of switches may be connected to the plurality of power receiving elements. An output circuit may provide wirelessly received power to the electronic device. The plurality of switches may be configured to selectively short circuit at least one of the plurality of power receiving elements.

Abstract: An apparatus for wirelessly receiving power via a wireless field generated by a transmitter includes a resonator configured to generate electrical current to power or charge a load based on a voltage induced in the resonator in response to the wireless field, a first variable capacitor electrically coupled to the resonator and configured to adjust a first capacitance of the first variable capacitor responsive to a first control signal, a second variable capacitor electrically coupled to the resonator and configured to adjust a second capacitance of the second variable capacitor responsive to a second control signal, and a control circuit configured to adjust and apply the first control signal and the second control signal to the first variable capacitor and the second variable capacitor, respectively, to adjust a resonant frequency of the resonator and a voltage output to the load based on an electrical characteristic indicative of a level of power output to the load.

Abstract: A current sensor may include a sense element disposed proximate a conductor. The current sensor may be configured to couple to a first magnetic field generated at the conductor when current flows in the conductor. An output electrically connected to the sense element can produce a signal that is representative of the flow of current in the conductor. The sense element may be oriented in a plane parallel to magnetic field lines of a second magnetic field generated by a load connected to the conductor.

Abstract: In one aspect, an apparatus for wirelessly coupling with other devices is provided. The apparatus includes a metallic cover having a removed portion. The apparatus comprises a first coil substantially wound around the removed portion of the metallic cover and configured to communicate with at least one other device via a communications protocol. The metallic cover comprises a second coil substantially wound around the removed portion of the metallic cover and configured to wirelessly and inductively receive charging power sufficient to charge or power the apparatus from at least one wireless charging power transmitter.

Abstract: An apparatus for receiving wireless power is provided. The apparatus comprises a coupler configured to receive a first amount of wireless power via a wireless field generated by a wireless power transmitter. The apparatus comprises a sensor circuit configured to measure the first amount of wireless power. The apparatus comprises a controller configured to instruct a feedback circuit to provide an indication to a user based on a comparison of the first amount of wireless power measured by the sensor circuit to a power threshold.

Abstract: An apparatus and method for lost power detection are described. In one implementation, an apparatus for wirelessly transferring power includes an antenna configured to provide wireless power to a chargeable device sufficient to charge or power the chargeable device positioned within a charging region of the antenna. The apparatus further includes a receiver configured to receive from the chargeable device a measurement of a first amount of energy received by the chargeable device over a first period of time. The apparatus further includes a processor configured to measure a second amount of energy provided by the antenna over a second period of time, compare the first amount of energy to the second amount of energy, and determine whether another object is absorbing power provided via the antenna based at least in part on comparing the first amount and the second amount of energy.

Abstract: Exemplary embodiments are directed to an apparatus for controlling magnetic field distribution including a wireless transmit antenna configured to generate a magnetic field for wirelessly transferring power to a charge-receiving device with the wireless transmit antenna, a parasitic antenna located near the wireless transmit antenna, and a switch configured to selectively enable the parasitic antenna to modify the magnetic field in response to an antenna parameter that indicates the presence of the charge-receiving device relative to the parasitic antenna.

Abstract: Systems and methods for converting voltages between different voltage levels in a receiver are disclosed. In an aspect, a wireless power receiver apparatus for charging a chargeable device is provided. The apparatus includes a plurality of receive antennas disposed on a cover of the chargeable device, wherein at least one of the plurality of receive antennas is configured to wirelessly receive power according to a wireless charging protocol different from at least one other of the plurality of receive antennas. The apparatus includes a switching circuit disposed on the cover and configured to receive the wireless power from at least one of the plurality of receive antennas and selectively provide a respective voltage from a corresponding one of the plurality of receive antennas across an output configured to be connected to an input of the chargeable device.

Abstract: Exemplary embodiments are directed to detection and validation of wirelessly chargeable devices positioned within a charging region of a wireless power transmitter. A device may include a detection circuit comprising an oscillator, the detection circuit configured to detect a change in a frequency of the oscillator. The device may also include a wireless power transmitter configured to determine whether a chargeable device is positioned within a charging region of the transmitter upon the detection circuit detecting the change in the frequency of the oscillator, wherein the transmitter further configured to be selectively electrically isolated from the detection circuit.

Abstract: Disclosed is a current sensor that senses current flow in a conductor by coupling a first magnetic field generated by the conductor to a sense element. The current sensor includes a shield including a first material that sandwiches the sense element to define a stack and a second material that sandwiches the stack. The shield is configured to generate a second magnetic field, responsive to a third magnetic field external to the current sensor that opposes the third magnetic field. The shield is further configured to prevent production of a magnetic field that opposes the first magnetic field generated by the flow of current in the conductor.

Abstract: Systems and methods for converting voltages between different voltage levels in a receiver are disclosed. In an aspect, a wireless power receiver apparatus for charging a chargeable device is provided. The wireless power receiver apparatus for charging a chargeable device can include a receive antenna configured to wirelessly receive power at a level sufficient for charging the chargeable device. The wireless power receiver apparatus can also include converter circuitry. The converter circuitry can be coupled to the receive antenna. The converter circuitry can be configured to receive an input voltage derived from the wirelessly received power. The converter circuitry can also be configured to produce an output voltage that is scaled to a value relative to the input voltage based on a relationship between the input voltage and a first voltage level threshold.

Abstract: On embodiment of a device with a noise adaptive power supply includes a noise adaptation unit configured to receive a noise adaptation signal. The noise adaptation unit can provide processing, such as digital filter processing to reduce the effect of power supply noise. In one embodiment, a feedback signal is used to adjust the output voltage of the power supply. The noise adaptation signal can be similar to the feedback signal. The noise adaptation unit can provide the processing in response to the noise adaptation signal.

Abstract: A wireless power transmitter may generate a magnetic field via a transmit antenna to induce voltage in a receive antenna of a wireless power receiver to power the unit and/or charge the receiver's battery. An apparatus for measuring wireless power transfer at an operating frequency between the transmitter and the receiver is provided. The apparatus comprises a first clock configured to generate a first clock signal at a first clock frequency that is higher than the operating frequency of the wireless power transfer. The apparatus further comprises a controller configured to operate based on a second clock signal, the first clock frequency higher than a second clock frequency of the second clock signal. The controller is further configured to measure an amount of wireless power transfer based on the first clock signal.

Abstract: A wireless power transfer system may include a primary resonator and one or more secondary resonators. At least one of the secondary resonators lie in overlapping relation to the primary resonator. An electromagnetic (EM) field generated by the primary resonator can couple to the secondary resonators, thus inducing current flow in the secondary resonators. EM fields generated by the secondary resonators interact with the EM field from the primary resonator to produce a resultant EM field.

Abstract: An apparatus and method for lost power detection are described. In one implementation, an apparatus for wirelessly transferring power includes an antenna configured to provide wireless power to a chargeable device sufficient to charge or power the chargeable device positioned within a charging region of the antenna. The apparatus further includes a receiver configured to receive from the chargeable device a measurement of a first amount of energy received by the chargeable device over a first period of time. The apparatus further includes a processor configured to measure a second amount of energy provided by the antenna over a second period of time, compare the first amount of energy to the second amount of energy, and determine whether another object is absorbing power provided via the antenna based at least in part on comparing the first amount and the second amount of energy.

Abstract: Exemplary embodiments are directed to variable power wireless power transmission. A method may include conveying wireless power to a device at a first power level during a time period. The method may further include conveying wireless power to one or more other devices at a second, different power level during another time period.