A signal analysis circuit for a supplying-end module includes a first voltage divider circuit, for attenuating a coil signal of a supplying-end coil; a first amplifier circuit, for obtaining parts of the attenuated coil signal higher than a reference voltage to output a half-wave signal; a first envelope detector, for performing envelope extraction on the half-wave signal to obtain a DC signal; a second voltage divider circuit, for attenuating the half-wave signal; a second amplifier circuit, for obtaining parts of the attenuated half-wave signal higher than the DC signal to output an amplified half-wave signal; a second envelope detector, for performing envelope extraction on the amplified half-wave signal to generate an envelope signal; a coupling capacitor, for filtering out the DC component of the envelope signal; a third voltage divider circuit, for combining the AC component of the envelope signal with a DC voltage to retrieve a trigger signal.

A wireless power transfer system includes a wireless power receiver having a rectifier. The rectifier includes switches. The wireless power receiver is operable to control the switches for ensuring a complex impedance at the input of the rectifier.

A power feeding apparatus is provided. The power feeding apparatus includes a power feeding unit configured to supply electric power to a power receiving apparatus through a magnetic field; a measuring unit configured to measure an electric characteristic value and to generate a measurement value; a power receiving unit configured to provide a set value; and a foreign substance detection unit configured to detect a foreign substance in the magnetic field based on the set value and the measurement value. A power receiving apparatus, a power feeding system, and a method of controlling power feeding are also provided.

A magnetic resonance electric power-transmitting apparatus in the magnetic resonance wireless electric power transmission system includes a resonance coil, an electric power-supplying unit which supplies electric power to the resonance coil to cause the resonance coil to generate a magnetic field, a magnetic material which varies a magnetic field generated by the resonance coil, and a position adjustment unit which adjusts a positional relationship between the resonance coil and the magnetic material.

The invention relates to contactless plug connectors and contactless plug connector systems for electromagnetically connecting a correspondrng mating plug connector. In order to allow for an electromagnetic connection, the invention suggest providing at least one antenna element arranged within the mating end of the contactless plug connector to transmit and/or to receive radio waves modulated with a predetennined carrier frequency, a transmitting/receiving circuit for modulating an inputted baseband input signal onto the predeteimined carrier frequency and transmitting the modulated baseband input signal and/or for demodulating a received radio wave into a baseband output signal. In particular, the contactless plug connector and contactless plug connector system include a securing element for securing the mating end of the contactless plug connector at close proximity to a corresponding mating end of the mating connector such that an electromagnetic connection can be established with the corresponding mating connector.

A wireless power transmitter in which an adjustment of the operating frequency is performed by selecting a signal from two or more signals having different frequencies as a carrier signal, the selected signal having a frequency corresponding to data included in the packet, the two or more signals has a resonant frequency for resonance coupling with the wireless power receiver and a frequency within a predetermined frequency from the resonant frequency, and the two or more signals at the resonant frequency and the frequency within the predetermined frequency range indicates a first data value and a second data value which is different from the first data value respectively.

Systems for tuning a wireless power transfer system are provided, which may include any number of features. In one embodiment, a TET system includes a receive resonator is adapted to be implanted in a human patient and is configured to receive wireless power from a transmit resonator. The system can include a controller configured to identify if a foreign object is interfering with the transmission of power or generating an induced voltage in the receive resonator. The controller can also be configured to control the transmit resonator to phase match with the foreign object. Methods of use are also provided.

A multi-source power converter is proposed to permit bidirectional DC to AC conversion from n (n≧2 and nε) DC voltage sources to an AC load with a reduced number of switches, and DC to DC conversion. Both single and three phases AC load are considered. The proposed topology consists in a single stage of conversion, and therefore a high efficiency can be expected for the system. Any type of DC sources can be used in the system (fuel-cell, battery, ultra-capacitor, photo-voltaic cells, DC bus, DC to DC or AC to DC converter, etc.). The AC load can be either single or three phases (single-phase AC grid/microgrid, three-phase electric machines, induction machine, synchronous machine, etc.). There is no requirement for the n DC voltage source values; they can be equal or different and they can be used individually or together by the converter to generate the AC output. If different DC voltage values are used, the converter can be controlled to generate a multi-level AC voltage. This permits to improve system's voltage and current power quality and to reduce electro-magnetic interferences (EMI). Therefore gains on both differential and EMI filters design can be expected.

The invention relates to a method, to a device, and to a system for determining a position of a vehicle. The method comprises the method steps: Measuring (S01) at least one first magnetic field strength of a magnetic field at one each first position (A-i) by means of a first magnetic field sensor (11) arranged on a vehicle (1); measuring (S02) at least one second magnetic field strength of the magnetic field at one each second position (B-i) by means of a second magnetic field sensor (12) arranged on the vehicle (1) at a distance from the first magnetic field sensor (11); determining (S03) position data of the vehicle (1) at least by comparing data, which are based on the measured first and second magnetic field strengths, to a predetermined magnetic field data of the magnetic field; and outputting (S04) a signal based on said position data.

A secondary battery system including plural batteries, extends the lifetime of each battery, and improves the charge/discharge (energy) efficiency of a whole system is provided. A secondary battery system includes plural batteries individually controllable for charging/discharging, plural PCSs each connected to the corresponding battery and performing charging/discharging to the connected battery, and a battery controller distributing a charge/discharge power value as a whole system to each of the PCSs at a fixed cycle or an arbitrary timing. The battery controller includes a preference order calculator setting a preference order to the plural batteries at each time point based on a deterioration characteristic of each battery related to each SOC thereof, and a distribution rate determining unit distributing the charge/discharge power value to the PCSs in accordance with the preference order.