Abstract: A vault apparatus for wireless power transfer includes a vault comprising an opening for a wireless power transfer (“WPT”) pad. The opening is located on a top of the vault. The vault apparatus includes a junction box formed into the vault. The junction box includes an opening oriented toward the top of the vault. The vault apparatus includes a sealing ring that maintains a WPT pad fixed in the vault where a portion of the sealing ring covers the junction box.

Abstract: A wireless power transfer (“WPT”) pad includes a plurality of capacitors and a winding shaped for wireless power transfer. The winding is divided into a plurality of winding sections. The plurality of winding sections are connected in series with one or more capacitors of the plurality of capacitors connected in series between winding sections.

Abstract: A wireless power transfer (“WPT”) pad with a pyramid-shaped ferrite chimney is disclosed. The WPT pad includes a winding comprising a conductor where the conductor is wound in a planar configuration. The winding includes a center point about which the winding is wound. The WPT pad includes a ferrite structure that includes a parallel section located on a side of the winding with at least a portion in parallel with the winding and a chimney section in magnetic contact with the parallel section and located at the center point of the winding. The chimney section extends perpendicular to the parallel section.

Abstract: A wireless power transfer (“WPT”) pad with a ferrite chimney is disclosed. The WPT pad includes a winding with a conductor where the conductor is wound in a planar configuration. The winding includes a center section about which the winding is wound. The WPT pad includes a ferrite structure with a parallel section located on a side of the winding with at least a portion in parallel with the winding, and a chimney section in magnetic contact with the parallel section and located in the center section of the winding, the chimney section extending perpendicular to the parallel section.

Abstract: A wireless power transfer (“WPT”) pad apparatus includes a ferrite structure and four windings adjacent to the ferrite structure. A horizontal surface of the ferrite structure is adjacent to each of the four windings and each of the four windings are wound in a horizontal pattern that is planar to the horizontal surface. The four windings are arranged in a two-by-two square pattern in a north-south-north-south polarity arrangement.

Abstract: An apparatus for multi-pad wireless charging is disclosed. The apparatus includes a plurality of primary pad apparatuses. Each primary pad apparatus is positioned to transmit power to a secondary pad apparatus of a vehicle. The primary transmitter pad apparatuses are spaced apart sufficient for each of a plurality of vehicles to be positioned over one primary pad apparatus of the plurality of primary pad apparatuses. The apparatus includes a power converter apparatus connected to each of the plurality of primary pad apparatuses, a power feed that provides power to the power converter apparatus and a sharing controller that selectively controls which of the plurality of primary pad apparatuses transmits power to a secondary pad apparatus and/or controls power sharing between the primary pad apparatuses.

Abstract: A transmission cable to reduce radiated electromagnetic radiation includes a first conductor with current flowing in a positive direction, a second conductor with a current flowing in a negative direction, where the negative direction is opposite the positive direction and the current in the first conductor equal to the current in the second conductor, a third conductor with current flowing in the positive direction and a fourth conductor with a current flowing in the negative direction. The current in the third conductor is equal to the current in the fourth conductor. The first conductor, the second conductor, the third conductor, and the fourth conductor are arranged in a symmetrical square pattern and the conductors are each on a corner of the square pattern. The first conductor is opposite the third conductor and adjacent to the second conductor and the fourth conductor.

Abstract: A first apparatus for passive magnetic field attenuation comprises a wireless power transfer (“WPT”) pad comprising one or more windings and a ferrite structure adjacent to the one or more windings, and a passive magnetic flux cancellation (“PMFC”) structure located adjacent to the WPT pad. The PMFC structure includes one or more vertical shields oriented substantially perpendicular to the WPT pad, where each of the one or more vertical shields attenuates an electromagnetic field, and a vertical shield retention structure that retains each of the one or more vertical shields in position with respect to the WPT pad.

Abstract: An apparatus includes a first charging coil with one or more conductors arranged in a first winding pattern, a second charging coil with one or more conductors arranged in a second winding pattern, and a ferrite structure with a main section with a top side, a first side section and a second side section. A portion of the top side of the main section is adjacent to a portion of the bottom side of the first side section and the second side section. A portion of the first and second charging coils are positioned adjacent to the top side of the main section interior in between the first and second side sections. A portion of the first charging coil is adjacent to the bottom of the first side section. A portion of the second charging coil is adjacent to the bottom of the second side section.

Abstract: An apparatus includes a ping detection module that detects a ping signal transmitted from a secondary pad to a primary pad. The secondary pad is located on a mobile device and the primary pad located on a stationary WPT device, where the stationary WPT device transmits power through the primary pad to the secondary pad of the mobile device during a wireless power transfer operation. The ping signal includes a mobile device ID and the mobile device ID is unique to the mobile device. The apparatus includes an ID detection module that detects the mobile device ID from the ping signal received at the primary pad and a pairing module that pairs the stationary WPT device with the mobile device in response to detecting the mobile device ID of the mobile device.

Abstract: A method for litz wire termination includes placing a ferrule over exposed conductors on an end of litz wire. The exposed conductors include a portion of the litz wire without an external insulation layer, and a portion at the end of the litz wire protrude past the ferrule. The method includes crimping the ferrule to the litz wire and placing the end of the litz wire with the ferrule in molten solder past the end of the ferrule. The method includes maintaining the litz wire in the molten solder until insulation on conductors of the litz wire is removed from the conductors in the molten solder and solder bonds to the conductors that are within in the molten solder. The method includes removing the litz wire from the molten solder and allowing the litz wire to cool until molten solder bonded to the conductors transitions to a solid state.

Abstract: An approach module determines that a wireless power transfer (WPT) secondary pad on a vehicle approaching a WPT primary pad is within an approach distance threshold from the WPT primary pad. A pulse module generates an electrical alignment pulse in the WPT primary pad or WPT secondary pad in response to determining that the WPT secondary pad is within the approach distance. A measurement module determines an amount of magnetic coupling between the WPT primary pad and the WPT secondary pad, and a feedback module that provides an alignment signal to a driver of the vehicle. The alignment signal represents magnetic coupling. The pulse module continues to provide electrical alignment pulses, the measurement module continues to determine an amount of magnetic coupling in response to the electrical alignment pulses, and the feedback module continues to provide alignment signals indicative of an amount of magnetic coupling as the vehicle moves in relation to the WPT primary pad.

Abstract: An apparatus for a removable inductive power pad is disclosed. The apparatus includes a frame with an opening in a top surface of the frame, and includes a removable pad with an inductive power transfer (“IPT”) pad embedded therein. The IPT pad is shaped to transmit power to a receiver pad positioned above the removable pad. The removable pad is sized to conform to the opening, where the opening of the frame is shaped to support the removable pad and the removable pad and the opening are sized so that a top surface of the removable pad is substantially level with the top surface of the frame. When the frame is located in a roadway, the frame and removable pad mounted in the opening of the frame are rated for vehicular traffic to drive over the frame and/or the removable pad without damaging the frame or the removable pad.

Abstract: A resonant AC-to-DC converter apparatus includes an inductance circuit comprising an inductor with a first and connected in series with each phase of an AC power source comprising a fundamental frequency, and a capacitance circuit that includes a capacitance for each phase. Each capacitance is connected between a second end of the inductor of a phase and a neutral connection, and the capacitance and the inductor of the connected phase form a resonant frequency. The apparatus includes a rectification circuit with an input and an output, the input connected, for each phase, in series with the second end of the inductor of the phase. The resonant frequency is related to the fundamental frequency to provide a gain at the fundamental frequency, the gain boosting a voltage of the input to the rectification circuit at the fundamental frequency above an output voltage of the AC source.

Abstract: An apparatus for wireless power charging includes a first charging coil with a first conductor arranged in a winding pattern with a first winding around a center point and each successive winding of the first charging coil is further away from the center point than the first winding and any previous windings. A second charging coil includes a second conductor wound with respect to the first charging coil where each coil of the second charging coil is arranged between each winding of the first charging coil. The first charging coil and second charging coil are connected in parallel. A ferrite structure is positioned adjacent to the first charging coil and the second charging coil.

Abstract: An apparatus includes a ping detection module that detects a ping signal transmitted from a secondary pad to a primary pad. The secondary pad is located on a mobile device and the primary pad is located on a stationary wireless power transfer (“WPT”) device. The stationary WPT device transmits power through the primary pad to the secondary pad of the mobile device during a wireless power transfer operation. The apparatus includes a signal strength module that determines a signal strength of the ping signal received at the primary pad, and an alignment module that determines an amount of alignment of the secondary pad with respect to the primary pad based on the determined signal strength of the received ping signal.

Abstract: An apparatus for charge management for an electric vehicle is disclosed. A system and method also perform the functions of the apparatus. The apparatus includes a battery status module that displays a battery charge status indicator on an electronic display of an electric device. The battery charge status indicator is for a battery providing power to the electric device. The apparatus includes a charging target module that displays a charging target on the electronic display. The charging target is related to the battery charge status indicator and indicates a desired charge level for the battery. The apparatus includes a target adjustment module that adjusts the charging target based on a predicted next battery charging and battery usage, wherein the battery charging and usage are based on a schedule and/or a planned route.