Abstract: Techniques of magnetic field distribution are described herein. The techniques may include forming a wireless charging component including a driving coil to receive a driven current generating a magnetic field. An outer turn of a parasitic coil may be formed, wherein the outer turn is adjacent to the driving coil. An inner turn of the parasitic coil may be formed, wherein an inductive coupling between the driving coil and the parasitic coil generates a redistribution of a portion of the magnetic field at the inner turn.

Abstract: This disclosure provides systems, methods and apparatus for tuning a transmit antenna for operation in a plurality of frequency bands. In one aspect, a transmitting antenna system is provided. The transmitting antenna system includes an active transmit antenna and a tunable passive antenna. The active antenna is configured to transmit a field over a plurality of operating frequencies. The passive antenna is configured to transmit a field over at least two frequencies of the plurality of operating frequencies. In one aspect, the tunable passive antenna includes a network of a plurality of reactive elements. In another aspect, the plurality of operating frequencies is selected from a set including a charging frequency, an NFC frequency, and a communication frequency.

Abstract: Techniques of forming a transmitter coil are described herein. The techniques may include forming turns of the transmitter coil, wherein a non-uniform spacing between the turns of the transmitter coil is to reduce a magnetic field variation associated with the transmitter coil.

Abstract: Techniques for voltage regulation in a system, method, and apparatus are described herein. An apparatus for voltage regulation in a wireless power receiver may include a rectifier having an output voltage. The apparatus may also include voltage compensation logic including at least one capacitor to reduce voltage variation of the output voltage from the rectifier.

Abstract: This disclosure provides systems, methods, and apparatus for filtering of a rectifier in a wireless power receiver. In one aspect a wireless power receiver is provided. The wireless power receiver includes a rectifier circuit configured to provide direct-current (DC) based at least in part on a time-varying voltage generated via a wireless field provided from a wireless power transmitter. The wireless power receiver further includes a band-stop filter circuit configured to filter an output of the rectifier circuit and electrically isolate a capacitor from the rectifier circuit at an operating frequency.

Abstract: The disclosure relates to a method, apparatus and system to wirelessly charge a device. In one embodiment, the disclosure relates to a wireless charging station having a detector to identify presence of a device at or near the charging station that would otherwise be damaged by the magnetic field of the wireless charging station. The detector detects a response signal emitted from the device under charge and determines whether to generate the desired magnetic field to charge the device or to cease the magnetic field to preserve the device from potential damage caused by the magnetic field.

Abstract: Techniques of wireless power transmission are described herein. An example wireless power transmitting apparatus may include a coil and control circuitry. The control circuitry is configured to apply a first signal to the coil and measure a change in a current in the coil to discover presence of an object. The control circuitry is also configured to provide a second signal to the coil, subsequent to discovering presence of the object. The control circuitry is also configured to detect whether the object is a Power Receiver based on whether a load modulated signal is received from the object subsequent to providing the second signal. The control circuitry is also configured to perform power transfer to the object subsequent to detection that the object is a Power Receiver.

Abstract: Aspects of a protection circuit and method are disclosed. A transmit circuit generates a power transmit signal for powering the transmit antenna to generate a wireless field sufficient for wirelessly charging a device. A detection circuit senses a strength of an electromagnetic field received by the transmit antenna and further configured to generate an sense signal indicating the strength of the electromagnetic field received by the transmit antenna. A power control circuit controls a switch based at least partly on the sense signal. The power control circuit can attenuate an electrical coupling between the transmit antenna and the transmit circuit such that the received electromagnetic field is inhibited from damaging the transmit antenna or the transmit circuit.

Abstract: Techniques for wireless charging in a system, method, and apparatus are described herein. For example, the apparatus includes a first wireless power receiving coil configured to receive power from a first wireless power transmitting coil of a wireless charger. The apparatus also includes a second wireless power transmitting coil coupled to the first wireless power receiving coil, wherein the second wireless power transmitting coil is configured to propagate current resulting in a magnetic field.

Abstract: Techniques of load modulation are described herein. A wireless power transmitting unit may include a resonator to periodically transmit a short beacon having a first time period. The wireless power transmitting unit also includes circuitry coupled to the resonator. The circuitry is configured to detect a load change in the resonator when transmitting the short beacon and cause the resonator to transmit a long beacon subsequent to said transmitting the short beacon if said load change is detected. The long beacon has a second time period longer than the first time period.

Abstract: Systems and methods for low loss wireless power transmission are described herein. In one aspect, a transmission coil for transmitting wireless power comprises a first and second spiral coil. Each spiral coil comprises a plurality of turns. A center of the first spiral coil to an outermost turn of the first spiral coil defines a first cross section, and a center of the second spiral coil to an outermost turn of the second spiral coil defines a second cross section. Portions of the first spiral coil along the first cross section and the second spiral coil along the second cross section have a mutual inductance with respect to a receive coil greater than 65% of a maximum mutual inductance along the first and second cross sections. The second spiral coil is counter-wound relative to the first spiral coil.

Abstract: Exemplary embodiments are directed to wireless power devices. A device may include a transmit antenna and a metallic structure spaced from and configured for detuning the transmit antenna. The device may further include a circuit for tuning the transmit antenna.

Abstract: Exemplary embodiments are directed to wireless power transfer to an electronic circuit including a wireless charging receive antenna comprising a first loop of an energy receiving conductor and at least another loop of said energy receiving conductor electrically coupled to the first loop. The loops form a multi-turn loop antenna to resonate at a wireless charging frequency and provide wirelessly received power to the electronic device. The multi-turn loop antenna is configured for affixing to a housing of the wireless device.

Abstract: Systems and methods may provide for a wireless charging device having a concave-shaped charging platform defining a charging area. The wireless charging device may include a three-dimensional transmitter coil, and at least one additional transmitter coil having a non-uniform spacing within the concave-shaped charging platform to reduce magnetic field variations associated with the three-dimensional transmitter coil.

Abstract: Techniques of capacitive coupling in a wireless power system are described herein. The techniques may include forming a transmitting coil to be inductively coupled to a receiving coil of a device under charge (DUC). The techniques may include forming a capacitive element of the transmitting coil to be capacitively coupled to a conductive component of the DUC.

Abstract: Wireless charging communication examples are described. Various techniques for establishing a communication link between a power transmit unit and a power receive unit through a low energy wireless communication interface to enable the power receive unit to receive power are described.

Abstract: Techniques of magnetic field distribution are described herein. The techniques may include forming a wireless charging component including a driving coil to receive a driven current generating a magnetic field. An outer turn of a parasitic coil may be formed, wherein the outer turn is adjacent to the driving coil. An inner turn of the parasitic coil may be formed, wherein an inductive coupling between the driving coil and the parasitic coil generates a redistribution of a portion of the magnetic field at the inner turn.

Abstract: Techniques of load modulation are described herein. A wireless power receiving unit may include a receiving coil to receive a short beacon having a first time period, and a long beacon having a second time period longer than the first time period. A controller of the wireless power receiving unit is to initiate load modulation at the receiving coil during the long beacon. The controller is configured to continue to perform the load modulation during the long beacon until sufficient power is received at the wireless power receiving unit to initiate a wireless data transmission during the long beacon.

Abstract: This disclosure provides systems, methods and apparatus for tuning a wireless power transmitter. In one aspect an apparatus configured to wirelessly provide power to a load is provided. The apparatus includes a transmit circuit including a transmit coil. The transmit circuit is configured to wirelessly provide power to the load. The transmit coil is configured to resonate at a resonant frequency. The transmit circuit has a reactance. The apparatus further includes a detection circuit configured to detect a change in the resonant frequency while providing power to the load. The apparatus further includes a tuning circuit configured to adjust the reactance based on the change.

Abstract: Techniques of forming a transmitter coil are described herein. The techniques may include forming turns of the transmitter coil, wherein a non-uniform spacing between the turns of the transmitter coil is to reduce a magnetic field variation associated with the transmitter coil.