Abstract: A two-stage power delivery network includes a voltage regulator and an interposer. The interposer includes a packaging substrate having an embedded inductor. The embedded inductor includes a set of traces and a set of through substrate vias at opposing ends of the traces. The interposer is coupled to the voltage regulator. The two-stage power delivery network also includes a semiconductor die supported by the packaging substrate. The two-stage power delivery network also includes a capacitor that is supported by the packaging substrate. The capacitor is operable to provide a decoupling capacitance associated with the semiconductor die and a capacitance to reduce a switching noise of the voltage regulator.

Abstract: Systems, methods and apparatus are disclosed for a dual mode wireless power receiver. In accordance with on aspect, an apparatus for receiving wireless power is provided. The apparatus includes a first coil configured to wirelessly receive power from a first transmitter configured to generate a first alternating magnetic field having a first frequency. The apparatus further includes a second coil configured to wirelessly receive power from a second transmitter configured to generate a second alternating magnetic field having a second frequency higher than the first frequency. The second coil is positioned to enclose the first coil. A first coupling factor between the first coil and a coil of the first transmitter is higher than a second coupling factor between the second coil and a coil of the second transmitter when the first and second coils are positioned within respective charging regions of the first and second transmitters.

Abstract: Certain aspects of the present disclosure provide a semiconductor capacitor. The semiconductor capacitor generally includes a first non-insulative region disposed above an insulative layer, an insulative region, and a second non-insulative region disposed adjacent to the insulative region, wherein the insulative layer is disposed above the second non-insulative region and the insulative region. In some cases, at least a portion of the insulative region is disposed above one or more portions of the second non-insulative region.

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 multi-level rectifier is presented that is suitable for use at high frequencies, including into MHz range such as in the 6.78 MHz band used for wireless power transfer. To maintain the proper timing or switching waveform when operating at high frequencies, a feedback loop is used. The rectification circuit includes a multi-level waveform generator circuit that generates a multi-level control waveform from the input waveform and an indication of its current. The multi-level control waveform is maintained in phase with the input waveform. A control signal generation circuit receives the multi-level control waveform and generates control signals corresponding to levels of the multi-level control waveform. A synchronous rectifier receives the input waveform and includes a plurality of switches to provide an output voltage generated from the input waveform. The switches are coupled to receive the control signals and the output voltage is a function of the multi-level control waveform.

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: Techniques for controlling a resonant network are disclosed. An example of an apparatus for varying capacitance in a resonant network includes a variable capacitor circuit configured to vary a capacitance in response to a control signal, at least one biasing component operably coupled to the variable capacitor circuit, and a control circuit configured to generate the control signal, such that the control signal includes a first tuning value corresponding to a first capacitance value, and output the control signal at the first tuning value to reduce an impedance of the at least one biasing component and vary the capacitance of the variable capacitor circuit, such that the impedance of the at least one biasing component subsequently increases when the first capacitance value is realized.

Abstract: Certain aspects of the present disclosure provide a semiconductor variable capacitor based on a buried oxide process. The semiconductor variable capacitor generally includes a first conductive pad coupled to a first non-insulative region and a second conductive pad coupled to a second non-insulative region. The second non-insulative region may be coupled to a semiconductor region. The capacitor may also include a first control region coupled to the first semiconductor region such that a capacitance between the first conductive pad and the second conductive pad is configured to be adjusted by varying a control voltage applied to the first control region. The capacitor also includes an insulator region disposed below the semiconductor region, wherein at least a portion of the first non-insulative region is separated from the second non-insulative region by the insulator region such that the first conductive pad is electrically isolated from the second conductive pad.

Abstract: Certain aspects of the present disclosure provide a semiconductor variable capacitor. The semiconductor variable capacitor generally includes a first non-insulative region disposed above a semiconductor region, and a second non-insulative region disposed adjacent to the semiconductor region. In certain aspects, the semiconductor variable capacitor also includes a first silicide layer disposed above the second non-insulative region, wherein the first silicide layer overlaps at least a portion of the semiconductor region. In certain aspects, a control region may be disposed adjacent to the semiconductor region such that a capacitance between the first non-insulative region and the second non-insulative region is configured to be adjusted by varying a control voltage applied to the control region.

Abstract: An apparatus and method for transmission of wireless power to a plurality of chargeable devices. The apparatus and method include and provide for a wireless power transmitter including a power transmitting element configured to use a current at a first level to wirelessly transmit power sufficient to provide power to one or more chargeable devices positioned within a charging region. The apparatus and method further include and provide for a controller to detect a subsequent chargeable device positioned within the charging region and to adjust the current from the first level to a default level prior to communication with the subsequent chargeable device.

Abstract: A wireless power transmitter system includes: a power delivery structure comprising power transmitting elements (power transmitting elements), each of which is configured to induce a field, and configured to adapt to an exterior shape of an entity that contains a receiver; a power circuit configured to provide power to the power transmitting elements selectively; and a controller configured to: determine an electrical characteristic, other than power transfer to the receiver, associated with actuating at least one of the power transmitting elements; determine at least one power transmitting element subset, based on the electrical characteristic, containing less than all, and at least one, of the power transmitting elements; select, based on power transferred to the receiver, one or more charging power transmitting elements to use to charge the receiver wirelessly; and cause the power circuit to provide power to the one or more charging power transmitting elements.

Abstract: Exemplary embodiments of the present disclosure are related to a wireless power resonator and method that includes a wireless power transmit element. The wireless power transmit element may include a substantially planar transmit antenna configured to generate a magnetic field and formed from a conductive trace including a plurality of distributed inductive elements along the conductive trace. The transmit element may further include a filter formed from selected ones of the plurality of distributed inductive elements of the planar transmit antenna and configured to generate at least one frequency response.

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 wireless power transmitter configured detect a change in at least one parameter at the transmitter. The transmitter may further be configured to determine whether at least one valid chargeable device is positioned within a charging region of the transmitter upon detecting the change in the at least one parameter.

Abstract: Devices and methods for distributing power are disclosed. For example, one device includes multiple assemblable elements, each assemblable element is configured to permit interlocking between one or more of the multiple assemblable elements. The multiple assemblable elements each include a portion of a coil. The portions of the coil are electrically interconnected and configured to provide wireless power to a receiving device.

Abstract: The present disclosure describes aspects of injected conductive tattoos for powering implants. In some aspects, a system comprises a conductive tattoo used to efficiently transfer power wirelessly received from a transmitter outside a body to an electronic device in the body. The conductive tattoo is formed from a conductive material injected into an outermost permanent layer of the body. The conductive tattoo is configured to wirelessly receive and relay the power from the transmitter to the electronic device. In particular, the conductive tattoo may transfer the power to the electronic device over a coupling between the conductive tattoo and the electronic device.

Abstract: A uniform magnetic field may provide better performance in wireless power transmitters due to smaller impedance variations in an output of a power amplifier of a wireless power transmitter and also allow for wireless power transmitter pads to be thinner. One aspect of the disclosure provides a device for wireless power transfer. The device comprises a substantially planar transmit antenna that is configured to generate a magnetic field. The device also comprises a pad having a charging surface. At least a portion of the transmit antenna is disposed in the pad. The device also comprises a ferromagnetic material having a shape and a position relative to the transmit antenna. At least one of the shape or position of the ferromagnetic material, or a combination thereof, is selected to modify a distribution of the magnetic field at the charging surface.

Abstract: A multi-level rectifier is presented that is suitable for use at high frequencies, including into MHz range such as in the 6.78 MHz band used for wireless power transfer. To maintain the proper timing or switching waveform when operating at high frequencies, a feedback loop is used. The rectification circuit includes a multi-level waveform generator circuit that generates a multi-level control waveform from the input waveform and an indication of its current. The multi-level control waveform is maintained in phase with the input waveform. A control signal generation circuit receives the multi-level control waveform and generates control signals corresponding to levels of the multi-level control waveform. A synchronous rectifier receives the input waveform and includes a plurality of switches to provide an output voltage generated from the input waveform. The switches are coupled to receive the control signals and the output voltage is a function of the multi-level control waveform.

Abstract: Methods and circuitry are disclosed to produce a first signal representative of the AC voltage signal and a second signal representative of an AC current signal. The first and second signals may be combined with a clock signal to produce a third signal. A phase angle between the AC voltage signal and the AC current signal may be determined based on a pulse count indicative of how many pulses occur in the third signal over a predetermined period of time.

Abstract: Disclosed is an electronic device having a band to secure the electronic device to a user. The electronic device may include a first power receiving element arranged with the band, configured to couple to an externally generated magnetic field to wirelessly receive power. The electronic device may include a second power receiving element arranged along a portion of the band spaced apart from the first power receiving element, configured to couple to the externally generated magnetic field to wirelessly receive power.

Abstract: An apparatus may include an electrically conductive body 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 in the electrically conductive body, and configured to magnetically couple to a second magnetic field.