In an aspect of the disclosure, an apparatus for wirelessly transmitting power is provided. The apparatus includes a communication circuit configured to communicate with a first wireless power transmitter and a second wireless power transmitter. The apparatus further includes a controller circuit configured to identify a first phase of a first current provided to the first wireless power transmitter, the first current generating a first magnetic field. The controller circuit further determines a time to provide a second current to the second wireless power transmitter. The controller circuit further provides the second current at the determined time with a second phase having a phase difference between the first phase configured to reduce a magnitude of a combined magnetic field of the first and second magnetic fields in a region between the first and second wireless power transmitters.

A vehicle is paired to a selected wireless charging station of a plurality of wireless charging stations by joining the vehicle to a first wireless network provided by a central access point, assigning a channel to use for pairing the vehicle to the selected wireless charging station by a network manager, transmitting a channel identifier to the vehicle over the first wireless network, and transmitting the channel identifier to the plurality of wireless charging stations. The vehicle then configures a beacon device coupled to the vehicle to use the assigned channel and moves into proximity of the selected wireless charging station. The selected wireless charging station detects a beacon signal of the beacon device, confirms that the beacon signal is using the identified channel, and transmits information identifying a second wireless network to the vehicle. The vehicle can then join the second wireless network using the transmitted information.

A vehicle is paired to a selected wireless charging station of a plurality of wireless charging stations by joining the vehicle to a first wireless network provided by a central access point, assigning a channel to use for pairing the vehicle to the selected wireless charging station by a network manager, transmitting a channel identifier to the vehicle over the first wireless network, and transmitting the channel identifier to the plurality of wireless charging stations. The vehicle then configures a beacon device coupled to the vehicle to use the assigned channel and moves into proximity of the selected wireless charging station. The selected wireless charging station detects a beacon signal of the beacon device, confirms that the beacon signal is using the identified channel, and transmits information identifying a second wireless network to the vehicle. The vehicle can then join the second wireless network using the transmitted information.

An inductive charge system may include an inductive charging circuit having a switchgear configured to swap between a step-up converter and a step-down converter. The inductive vehicle charge station or system may include a controller configured to operate the switchgear to switch between the step-up converter and the step-down converter based on presence or absence of a load. The step-up converter may be a boost converter. The step-down converter may be a buck converter. The buck converter may have a maximum power output of 100 W. An output of the step-down converter may include a forward-biased diode to prevent backfeeding. The controller may be further configured to ramp an output voltage of the step-down converter from a coupling voltage to a charging voltage to prevent hard switching between the step-up converter and the step-down converter.

Systems, methods, and other embodiments described herein relate to charging a battery of an electric vehicle while the electric vehicle is hovering. In one embodiment, a method includes, responsive to determining that an electric vehicle does not include a receiver pad, inserting the receiver pad into the electric vehicle that is hovering in the air at a charging station. The method includes determining a space above a transmitter pad for the electric vehicle to hover based, at least in part, on a location and a size of the transmitter pad. The method includes charging a battery to a threshold value through the receiver pad.

Apparatus for inductively transmitting power, which apparatus comprises a primary unit with a primary coil and a secondary unit with a secondary coil, and in which the primary coil induces a magnetic transmission field in a transmission area between the primary unit and the secondary unit, and which has an even number of detector coil elements which are wound in opposite directions in pairs and form a detector pair.

An exemplary inductive power transfer system having a transmitter coil and a receiver coil. A transmitter-side power converter having a mains rectifier stage powering a transmitter-side dc-bus and controlling a transmitter-side dc-bus voltage U.sub.1,dc. A transmitter-side inverter stage with a switching frequency f.sub.sw supplies the transmitter coil with an alternating current. A receiver-side power converter having a receiver-side rectifier stage that rectifies a voltage induced in the receiver coil and powering a receiver-side dc-bus and a receiver-side charging converter controlling a receiver-side dc-bus voltage U.sub.2,dc. Power controllers that determine from a power transfer efficiency of the power transfer, reference values U.sub.1,dc*, U.sub.2,dc* for the transmitter and receiver side dc-bus voltages. An inverter stage switching controller controls the switching frequency f.sub.sw to reduce losses in the transmitter-side inverter stage.

A power supply device supplies power from a power transmission coil to a power reception coil of a vehicle in a non-contact manner. The power supply device has a communication unit that receives a startup signal for activating the power supply device. A notification unit notifies a state of the power supply device. A controller controls the notification unit based on a detection result of a detection unit. The detection unit detects a non-contact power supply possible state, in which power can be supplied from the power transmission coil in a non-contact manner. The controller sets a notification state of the notification unit to a first notification state, when the non-contact power supply possible state is detected, and sets the notification state of the notification unit to a state that is different from the first notification state, when the non-contact power supply possible state is not detected.

A method for checking a test secondary unit of an inductive test charging system for charging an electrical energy store, wherein the test charging system comprises the test secondary unit having a test secondary coil and a reference primary unit having a reference primary coil, includes recording a plurality of actual primary unit impedance values of the test charging system at the reference primary coil for a corresponding plurality of test combinations of values of operating parameters of the test charging system. The method also includes comparing the plurality of actual primary unit impedance values with a reference value range for a primary unit impedance.

A method for checking a test secondary unit of an inductive test charging system for charging an electrical energy store, wherein the test charging system comprises the test secondary unit having a test secondary coil and a reference primary unit having a reference primary coil, includes recording a plurality of actual primary unit impedance values of the test charging system at the reference primary coil for a corresponding plurality of test combinations of values of operating parameters of the test charging system. The method also includes comparing the plurality of actual primary unit impedance values with a reference value range for a primary unit impedance.