A system for wirelessly supplying electric energy to a rotating device includes a flange disk, a disk-shaped ring, an annular plastic filling, a receiving coil which is embedded in the annular plastic filling, a U-shaped ferrite core having a short section, the end face of which is directed to the plastic filling, a long section which is oriented parallel to the short section and which extends parallel along the outer surface of the annular plastic filling, with the sections connected to one another via a section, a coil system and a receiving coil made of revolving wire windings. A distance of the end face of the long section from the rotation axis of the flange disk is smaller than a distance of the receiving coil from the rotation axis of the flange disk.

A power transmitter includes a transmitter antenna includes at least one coil configured to transmit the power signal to the power receiver, the at least one coil and a shielding comprising a ferrite core and defining a cavity, the cavity configured such that the ferrite core substantially surrounds all but the top face of the at least one coil. The power transmitter includes a housing configured for housing, at least, the transmitter antenna. The housing defines an airflow opening configured to provide an airflow to a first airflow channel and to a second airflow channel. The first and second airflow channels configured to provide the airflow to one or more of a top face of a mobile device thereon and a bottom face of the mobile device.

A power transmitter includes a transmitter antenna includes at least one coil configured to transmit the power signal to the power receiver, the at least one coil and a shielding comprising a ferrite core and defining a cavity, the cavity configured such that the ferrite core substantially surrounds all but the top face of the at least one coil. The power transmitter includes a housing configured for housing, at least, the transmitter antenna. The housing defines an airflow opening configured to provide an airflow to a first airflow channel and to a second airflow channel. The first and second airflow channels configured to provide the airflow to one or more of a top face of a mobile device thereon and a bottom face of the mobile device.

The present invention relates to a magnetic resonance charging system comprising a voltage source (1) and an inverter (2), said inverter (2) comprising a parallel LC inverter resonant circuit (3) and at least one charging plate (4), characterized in that said inverter resonant circuit (3) comprises a capacitor (32) connected in parallel to a primary winding (33) of said at least one charging plate (4) and in that said inverter (2) further comprises: a measuring means (5) for measuring the instantaneous voltage across said inverter resonant circuit (3), a phase shifter (6) connected to said measuring means (5) an excitation means (7) connected to the phase shifter (6), able to inject energy from said voltage source (1) into the inverter resonant circuit (3) during each cycle observed by the measuring means (5), with a phase shift indicated by the phase shifter (6).

The present invention also relates to a method of operating a charging system according to the invention.

The present invention relates to a magnetic resonance charging system comprising a voltage source (1) and an inverter (2), said inverter (2) comprising a parallel LC inverter resonant circuit (3) and at least one charging plate (4), characterized in that said inverter resonant circuit (3) comprises a capacitor (32) connected in parallel to a primary winding (33) of said at least one charging plate (4) and in that said inverter (2) further comprises: a measuring means (5) for measuring the instantaneous voltage across said inverter resonant circuit (3), a phase shifter (6) connected to said measuring means (5) an excitation means (7) connected to the phase shifter (6), able to inject energy from said voltage source (1) into the inverter resonant circuit (3) during each cycle observed by the measuring means (5), with a phase shift indicated by the phase shifter (6).

The present invention also relates to a method of operating a charging system according to the invention.

An inverter and power transmission coils are connected such that currents flow in opposite directions to each other when selection switches of respective power transmission coils adjacent to each other, out of a plurality of power transmission coils disposed in the movement direction of a mobile body, are caused to be conductive. The difference in currents flowing in the opposite directions is measured, and compared with a threshold, whereby whether or not a power reception coil mounted to the mobile body is present above the power transmission coil can be determined.

A wireless power transfer system comprises a power transmission device and a power reception device. The power reception device includes a power reception coil that wirelessly magnetically couples with a power transmission coil included in the power transmission device. The power transmission device includes a switching circuit in which switch elements perform switching operations, an input voltage adjustment circuit that is electrically connected to the switching circuit and adjusts an input voltage, and an MPU. The MPU is configured to recognize a power requirement presented by the power reception device, control the input voltage adjustment circuit and control intermittent oscillation of the switching circuit, and adjust the input voltage to prevent an oscillation stop period of the intermittent oscillation from exceeding a predetermined stop period.

A wireless power transfer system comprises a power transmission device and a power reception device. The power reception device includes a power reception coil that wirelessly magnetically couples with a power transmission coil included in the power transmission device. The power transmission device includes a switching circuit in which switch elements perform switching operations, an input voltage adjustment circuit that is electrically connected to the switching circuit and adjusts an input voltage, and an MPU. The MPU is configured to recognize a power requirement presented by the power reception device, control the input voltage adjustment circuit and control intermittent oscillation of the switching circuit, and adjust the input voltage to prevent an oscillation stop period of the intermittent oscillation from exceeding a predetermined stop period.

A power transmitter (101) for a wireless power transfer system comprises a transmitter coil (103) and a driver (201) generates a drive signal) for the transmitter coil (103) employing a repeating time frame with a power transfer time interval and a reduced power time interval during which a power level of the power transfer signal is reduced. A driver (201) generates a drive signal for the transmitter coil (103) to generate the power transfer signal. A communicator (205) receives messages from the power receiver (105) and an adapter (213) adapts a timing property of the reduced power time interval in response to at least a first message received from the power receiver (105). A synchronizer (206) for synchronizing a foreign object detection and the generation of a test signal to occur during the reduced power time interval. The operation may typically be a foreign object detection or communication, and the timing property may e.g. be a duration of the reduced power time interval.

A power transmitter (101) for a wireless power transfer system comprises a transmitter coil (103) and a driver (201) generates a drive signal) for the transmitter coil (103) employing a repeating time frame with a power transfer time interval and a reduced power time interval during which a power level of the power transfer signal is reduced. A driver (201) generates a drive signal for the transmitter coil (103) to generate the power transfer signal. A communicator (205) receives messages from the power receiver (105) and an adapter (213) adapts a timing property of the reduced power time interval in response to at least a first message received from the power receiver (105). A synchronizer (206) for synchronizing a foreign object detection and the generation of a test signal to occur during the reduced power time interval. The operation may typically be a foreign object detection or communication, and the timing property may e.g. be a duration of the reduced power time interval.