Koninklijke Philips Corporation N.v.

]koninklije Philips N.v.

Pascal Leonard Maria Theodoor Lebens

Wilhelmus Gerardus Maria Ettes

Klaas Jacob Lulofs

Andries Van Wageningen

Johannes Wilhelmus Draak

Friso Rietstra

Aleksei Agafonov

Henricus Antonius Gerardus Van Vugt

Klaas Jakob Lulofs

Johannes Hubertus Gerardus Op Het Veld

A power transmitter () comprises a driver () generating a drive signal for a transmitter coil to generate a power transfer signal during a power transfer time interval and an electromagnetic test signal during a foreign object detection time interval. A set of balanced detection coils () comprise two detection coils arranged such that signals induced in the two detection coils by an electromagnetic field generated by the transmitter coil compensate each other. A foreign object detector () is coupled to the detection coils and performs foreign object detection during the foreign object detection time interval. The foreign object detector () is arranged to detect a foreign object in response to a property of a signal from the detection coils meeting a foreign object detection criterion. A transformer () has a primary winding and a secondary winding coupled in series with the set of balanced detection coils A compensation circuit () is coupled to the primary winding and arranged to generate a compensation drive signal for the primary winding which offsets a combined voltage of the set of detection coils.

Wireless power transfer and communication

A wireless power transmitter () an output circuit () comprises a transmitter coil () for which generates the power transfer signal a drive signal generated by a driver circuit () is applied. A power loop controller () implements a power control loop for controlling the drive signal to adjust a power level of the power transfer signal in response to power control error messages received from the power receiver (). A mode store () stores a plurality of power level modes for the power receiver where each power level mode is associated with a reference power level for the power transfer signal. A mode circuit () adapts the drive signal to set the power level of the power transfer signal to a first reference value in response to receiving a mode request message where the first reference value corresponds to a reference power level for a first power level mode indicated in the mode request message.

Wireless power transfer

A power transmitter () provides wireless power transfer to a power receiver () via a wireless inductive power transfer signal. The power transmitter () comprises transmitter coil () for generating the power transfer signal and a driver () generating a drive signal for this. A communicator () communicates with the power receiver () via a communication channel that does not use the power transfer signal as a communication carrier. A power loop controller () implements a power control loop by adapting a power level of the power transfer signal in response to power control error messages received from the power receiver (). A generator () introduces a power level variation sequence to the power transfer signal and a validity detector () detects data received by the communicator () to be invalid data for the power transfer in response to a comparison of the power level variation sequence and power change requests of the power control error messages.

Power transmitter, system and method therefor

A power transmitter () comprises a driver () generating a drive signal for a transmitter coil to generate a power transfer signal during a power transfer time interval and an electromagnetic test signal during a measurement time interval. A set of balanced detection coils () comprise two detection coils arranged such that signals induced in the two detection coils by an electromagnetic field generated by the transmitter coil compensate each other. An estimation circuit () determines a position/coupling factor estimate for the power receiver () in response to signals from the plurality of sets of balanced detection coils () during the at least one measurement time interval.

Wireless power transmitter and method of operation therefor

There is provided a wireless power transfer system comprising a power transmitter for providing power to a power receiver via an inductive power signal which comprises a power transmitter which in turn comprises a transmitter resonant circuit comprising a power transmitting inductor having a transmission resonance at a first frequency and arranged for generating the power transfer signal, the power transmitting inductor being arranged to be magnetically couplable to a power receiver inductor in the power receiver, a power transmitter driver, operably coupled to the power transmitter resonant circuit and arranged to generate a drive signal for the power transmitting inductor, a transmitter communication resonant circuit, different from the transmitter resonant circuit and directly or capacitively coupled to the power transmitting inductor, being arranged to establish a transmitter communication resonance at a second frequency, different from the first frequency, for communications, wherein the power transmitting inductor participates in both transmission and transmitter communication resonances and wherein the transmitter and transmitter communication resonant circuits are arranged to be able to exhibit both first and second resonances simultaneously.

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Eindhoven, Netherlands

Pascal Leonard Maria Theodoor Lebens