A wireless power system capable of transmitting power through the skin over distances ranging from a few inches to several feet includes an external transmitting coil assembly and a receiving coil assembly. A transmitting resonant coil and a receiving resonant coil are constructed as to have closely matched or identical resonant frequencies so that the magnetic field produced by the transmitting resonant coil is able to cause the receiving resonant coil to resonate strongly also, even when the distance between the two resonant coils greatly exceeds the largest dimension of either coil. The receiving resonant coil then creates its own local time varying magnetic field, which inductively produces a voltage to provide power to an active implantable medical device or implantable rechargeable battery.

According to one embodiment, a storage system includes storage devices configured to execute communication by using an identifier, a converter configured to convert the identifier of the storage devices, a controller configured to execute communication with the storage devices via the converter by using the identifier converted by the converter, convert a DC power output from the storage devices into a DC power of a predetermined magnitude and output the DC power, and charge the storage devices with the DC power of the predetermined magnitude, an AC/DC converter configured to convert the DC power output from the controller into an AC power, convert an AC power supplied from a distribution system into a DC power and supply the DC power to the controller, and a controller configured to control the controller and the AC/DC converter.

According to one embodiment, a storage system includes storage devices configured to execute communication by using an identifier, a converter configured to convert the identifier of the storage devices, a controller configured to execute communication with the storage devices via the converter by using the identifier converted by the converter, convert a DC power output from the storage devices into a DC power of a predetermined magnitude and output the DC power, and charge the storage devices with the DC power of the predetermined magnitude, an AC/DC converter configured to convert the DC power output from the controller into an AC power, convert an AC power supplied from a distribution system into a DC power and supply the DC power to the controller, and a controller configured to control the controller and the AC/DC converter.

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.

Disclosed are a wireless power transfer apparatus, and a method of changing a frequency in the wireless power transfer apparatus, in which the magnetic field intensity in a specific frequency band is decreased by periodically changing the frequency of a wireless power signal, so that it is possible to spread a frequency spectrum. To this end, a wireless power transfer apparatus includes a power transmission unit and a control unit. The power transmission unit generates a wireless power signal for transferring wireless power based on a carrier signal. The control unit determines a sweep frequency range and sweep period for the carrier signal and controls the power transmission unit to periodically change the frequency of the wireless power signal by periodically changing the frequency of the carrier signal based on the determined sweep frequency range and sweep period.

A rectifier circuit rectifies a current that flows through a reception coil. A smoothing capacitor is connected to the output of the rectifier circuit. A judgment unit generates a notification signal that corresponds to a comparison result obtained by comparing the voltage V.sub.RECT across the smoothing capacitor with a predetermined threshold voltage at a judgment timing. The judgment timing is positioned after the start of reception of a signal from a power supply apparatus.

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 device for testing a wireless power network is disclosed. The network includes at least one power source, at least one load, and multiple resonators configured to couple wireless power from the at least one power source to the at least one load. The device includes: a user interface for receiving input from a user and providing information to the user; a measurement module for measuring, whether directly or indirectly, at least one operational characteristic of the wireless power network and information about the geometric arrangement of the multiple resonators in the wireless power network; a memory for storing design specifications about the wireless power network; and an electronic processor configured to calculate information about a performance of the wireless power network based on the measured operational characteristic, the information about the geometric arrangement of the multiple resonators, and the stored design specifications, and further configured to provide the performance information to the user through the user interface.

A metal object detection device includes a plurality of detection coils, a capacitor configuring a resonant circuit in cooperation with each of at least two of the detection coils, a first series connection body, a second series connection body, a voltage applying unit, and a processing unit. The voltage applying unit applies an AC voltage to both ends of each of the first series connection body and the second series connection body. The processing unit performs a process for detecting the metal object on the basis of a potential difference between a connection point included in the first series connection body and a connection point included in the second series connection body.

The present disclosure relates to a wireless power transmitter, a wireless power receiver and a wireless charging system in a wireless power transfer field. A wireless power transmitter disclosed herein includes a first coil configured to transfer a wireless power signal to a wireless power receiver, a second coil having a wire wound to transfer power to the wireless power receiver in a wireless manner, and a controller configured to control operations of the first and second coils, wherein the first coil is provided with a wire wound along an edge of a shape of the second coil.