Abstract: A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

Abstract: A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

Abstract: A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

Abstract: A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

Abstract: A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

Abstract: The present disclosure describes techniques for estimating or measuring changes in peak magnetic flux levels based on the influence of a receive coil to the overall flux density over a transmit coil. The estimated or measured changes in peak magnetic flux levels are used to adjust currents in the coils to reduce the flux density while maintaining sufficient power transfer. In some aspects, an apparatus for controlling power transfer is provided. The apparatus includes a controller configured to receive or determine a measured or estimated magnetic flux level on or outside a housing configured to house a transmit coil. The controller is further configured to determine an electrical current level for at least one or both of the transmit coil or a receive coil that reduces a peak magnetic flux density level in proximity to the transmit coil based on the measured or estimated magnetic flux level.

Abstract: In certain aspects, methods and systems for converting DC power to AC power by a wireless power receiver are disclosed. Certain aspects provide a wireless power receiver including a resonant circuit. The wireless power receiver includes a first switching circuit coupled to the resonant circuit, the first switching circuit configured to act as an inverter and generate a first signal, based on an output from a battery, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency. The wireless power receiver includes a second switching circuit coupled to the resonant circuit that is configured to bias the second switching circuit at the resonant frequency in response to the first signal, wherein the second switching circuit is configured to act as a rectifier and is configured to extract the envelope to generate a second signal at half of the first frequency.

Abstract: In certain aspects, methods and systems for converting DC power to AC power by a wireless power receiver are disclosed. Certain aspects provide a wireless power receiver including a resonant circuit. The wireless power receiver includes a first switching circuit coupled to the resonant circuit, the first switching circuit configured to act as an inverter and generate a first signal, based on an output from a battery, at a resonant frequency of the resonant circuit, the first signal having an envelope at a first frequency. The wireless power receiver includes a second switching circuit coupled to the resonant circuit that is configured to bias the second switching circuit at the resonant frequency in response to the first signal, wherein the second switching circuit is configured to act as a rectifier and is configured to extract the envelope to generate a second signal at half of the first frequency.

Abstract: A wireless electric vehicle charging system comprises base-side equipment for generating a magnetic field and vehicle-side equipment for receiving energy via the magnetic field to supply power to a vehicle-driving battery. Monitoring circuitry monitors one or more of voltage, current, or phase associated with the base-side equipment and halts generation of the magnetic field in response to a change in the voltage, current, or phase associated with the operation of the base-side equipment that indicates a fault condition at the vehicle-side equipment, which may include a loss of power or disconnection of a battery. Based on detection of the change, the monitoring circuitry can halt generation of the magnetic field to prevent damage at the vehicle-side equipment.

Abstract: The present disclosure describes aspects of switched-capacitor power ramping for soft switching. In some aspects, a resonant circuit of a wireless power transmitter includes a portion of capacitance that is switchable. This portion of capacitance can be disconnected from the resonant circuit to detune the resonant circuit, which may affect voltage or current flow in the resonant circuit. For example, when ramping transmitted power up or down, detuning the resonant circuit may enable an inverter of the wireless power transmitter to continuously soft switch through the power ramping process. By so doing, hard switching of the inverter can be avoided and the inverter can be implemented with lower-power or less expensive components.

Abstract: The present disclosure describes techniques for estimating or measuring changes in peak magnetic flux levels based on the influence of a receive coil to the overall flux density over a transmit coil. The estimated or measured changes in peak magnetic flux levels are used to adjust currents in the coils to reduce the flux density while maintaining sufficient power transfer. In some aspects, an apparatus for controlling power transfer is provided. The apparatus includes a controller configured to receive or determine a measured or estimated magnetic flux level on or outside a housing configured to house a transmit coil. The controller is further configured to determine an electrical current level for at least one or both of the transmit coil or a receive coil that reduces a peak magnetic flux density level in proximity to the transmit coil based on the measured or estimated magnetic flux level.

Abstract: The present disclosure describes aspects of switched-capacitor power ramping for soft switching. In some aspects, a resonant circuit of a wireless power transmitter includes a portion of capacitance that is switchable. This portion of capacitance can be disconnected from the resonant circuit to detune the resonant circuit, which may affect voltage or current flow in the resonant circuit. For example, when ramping transmitted power up or down, detuning the resonant circuit may enable an inverter of the wireless power transmitter to continuously soft switch through the power ramping process. By so doing, hard switching of the inverter can be avoided and the inverter can be implemented with lower-power or less expensive components.

Abstract: An apparatus, a system and a method for wireless power transfer are disclosed. A method of forming a physical core of a wireless power transfer device includes positioning two or more electromagnetically permeable members adjacent to one another and applying longitudinal pressure to an end of the electromagnetically permeable members, the electromagnetically permeable members at least partially encapsulated in retaining compound. A wireless power transfer device includes a casing in which is housed an induction coil, a plurality of electromagnetically permeable members arranged in a line and a retaining compound.

Abstract: Invention described herein relates to wireless power transfer systems and methods that efficiently and safely transfer power to electronic devices. In an aspect of the invention, an apparatus for wirelessly receiving power is provided. The apparatus comprises a receiver circuit comprising a receiver coil configured to receive wireless power from a wireless power transmitter via a magnetic field sufficient to charge or power a load of the apparatus. The receiver circuit further comprises a ferrite material having a first side coupled to the receiver coil. The apparatus further comprises a first heat exchanger coupled to a second side of the ferrite material.

Abstract: Systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote systems such as electric vehicles are disclosed. In one aspect an induction coil is provided comprising a plurality of substantially co-planar coils formed from one or more lengths of conducting material, each length of conducting material being electrically connectable at each end to a power source or battery, and wherein at least one of the lengths of conducting material is continuously wound around two or more of the coils. In another aspect, a method is provided for forming such an induction coil. In yet another aspect, a switching device is operable to alter the configuration of the coils, for example in response to a detected characteristic of another induction coil or device coupled thereto.

Abstract: This disclosure provides systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote system such as electric vehicles. In one aspect a circuit for wireless power transfer is provided. The circuit comprises an inductive element for receiving wireless power from a magnetic field associated with a wireless power transfer transmitter device. The circuit further comprises an output configured to be connected to a load. The circuit further comprises a voltage detector configured to detect the voltage across the load. The circuit further comprises at least one switching element between the inductive element and the output. The circuit further comprises a controller configured to maintain a current in the inductive element substantially constant as the voltage detected across the load varies.

Abstract: This disclosure provides systems, methods and apparatus for wireless power transfer and particularly wireless power transfer to remote system such as electric vehicles. In one aspect an apparatus for use with a wireless power transfer transmitter device comprising a first inductive element for generating a magnetic field, is provided. The apparatus comprises a direct current (DC) power source having an adjustable output voltage. The apparatus also comprises an inverter configured to convert the adjustable output voltage of the DC power source to alternating current. The apparatus also comprises at least one controller configured to receive an indication of current in the first inductive element and control the output voltage of the DC power source in response to the indication of current in the first inductive element. The apparatus reduces distortion signals in the alternating current output of the inverter while maintaining current in the inductive element substantially constant.

Abstract: The invention described herein relates to wireless power transfer systems and methods that efficiently and safely transfer power to electronic devices. In an aspect of the disclosure, an apparatus for wirelessly receiving power is provided. The apparatus may comprise a receiver circuit comprising a receiver coil configured to receive wireless power from a wireless power transmitter via a magnetic field sufficient to charge or power a load of the apparatus. The receiver circuit further comprises a ferrite material having a first side coupled to the receiver coil. The apparatus further comprises a first heat exchanger coupled to a second side of the ferrite material.

Abstract: Systems, methods and apparatus for a wireless power transfer are disclosed. In one aspect a wireless power transfer apparatus is provided. The apparatus includes a casing. The apparatus further includes an electrical component housed within the casing. The apparatus further includes a sheath housed within the casing. The apparatus further includes a conductive filament housed within the sheath. The electrical component is electrically connected with the conductive filament. The casing is filled with a settable fluid bound with the sheath to form a structural matrix.

Abstract: Systems, methods and apparatus for a wireless power transfer are disclosed. In one aspect a wireless power transfer apparatus is provided. The apparatus includes a casing. The apparatus further includes an electrical component housed within the casing. The apparatus further includes a sheath housed within the casing. The apparatus further includes a conductive filament housed within the sheath. The electrical component is electrically connected with the conductive filament. The casing is filled with a settable fluid bound with the sheath to form a structural matrix.