Koninklijke Philips Corporation N.v.

Other

Irdeto B.v.

Koninklijke Phillips Electronics N.v.

Irdeto Eindhoven B.v.

Philips Intellectual Property & Standards Gmbh

Antonius Adriaan Maria Staring

Andries Van Wageningen

Johan Cornelis Talstra

Wilhelmus Gerardus Maria Ettes

Maurice Jerome Justin Jean-Baptiste Maes

Boris Skoric

Eddy Gerrit Veltman

Menno Anne Treffers

Johannes Gerardus Fredericus Kablau

Aleksei Agafonov

Johannes Arnoldus Cornelis Bernsen

Antonius Adrianus Cornelis Maria Kalker

Johan Paul Marie Gerard Linnartz

Klaas Jacob Lulofs

Franciscus Lucas Antonius Johannes Kamperman

Robert Jochemsen

Pieter Bas Ijdens

Richard Henricus Maria Theelen

Achim Hilgers

Eberhard Waffenschmidt

Alphons Antonius Maria Lambertus Bruekers

Derk Reefman

Willem Marie Julia Marcel Coene

Jaap Andre Haitsma

Willem Potze

Aditya Mehendale

Alexandre Georgievich Sinitsyn

Emmanuel David Lucas Michael Frimout

Jacobus Petrus Josephus Heemskerk

Ronald Marcel Tol

Willem Charles Mallon

Petrus Carolus Maria Frissen

Bartholomeus Johannes Van Rijnsoever

Gijsbrecht C Wirtz

Joachim Artur Trescher

Laurens Henricus Swaans

Wilhelmus Fransiscus Johannes Fontijn

Arnold Karel Jansen Van Doorn

Paulus Mathias Hubertus Mechtildus Antonius Gorissen

Dries Van Wageningen

Charles Leonardus Corenlius Maria Knibbeler

Johan Paul Marie Gerald Linnartz

Lennaert Quirijn Bronts

A power receiver () communicates to a power transmitter () using load modulation data symbols modulated by a chip sequence with a chip sequence being divided into load time intervals with different modulation loads. The power transmitter () comprises a receiver () which includes a load measurer () determining measured load values of the power transfer signal for load time intervals. A chip determiner circuit () determines a received chip sequence from the measured load values where the received chip sequence comprises a sequence of chip values. Each chip value is determined in response to a difference between measured load values for at least two modulation load time intervals of the chip. A store () stores a set of chip sequences with each chip sequence linked to a data symbol. A detector () detects a received data symbol value in response to a correlation between the received chip sequence and chip sequences of the set of chip sequences.

Wireless power transfer

A power transmitter () provides power to a power receiver () via an inductive power transfer signal which is also used by the power receiver () for communication by load modulation. The power receiver () comprises a transmitter () arranged to transmit symbols in accordance with a first or second communication mode where the first mode modulates data symbols by a chip sequence from a set of sequences and the second communication mode does not. The power receiver () may transmit data symbols requesting a power transfer signal variation using a chip sequence from the set. A detector () may detect if the variation occurs, and if so a selector () selects the first communication mode and otherwise it selects the second communication mode. The approach may allow selection of an appropriate communication mode without requiring data to be transmitted from the power transmitter. The approach may provide improved backwards compatibility.

A power transfer system comprises a power transmitter () wirelessly providing power to a power receiver () via an inductive power transfer signal. Communication from power receiver () to the power transmitter () is by load modulation using the power transfer signal. The communication uses load modulation where each symbol is represented by a chip sequence being a sequence of modulation load values. The power transmitter () comprises a first communicator () which correlates a chip sequence received from the power receiver with a set of reference chip sequences being linked to data symbol values and determines the data symbol as the data symbol linked to a reference chip sequence for which the highest correlation with the first chip sequence is determined.

Communication in a wireless power transfer system

A power transmitter () of a wireless power transfer system comprises a resonance including a transmitter coil () for generating a power transfer signal for wirelessly transferring power to a power receiver (). Further, a driver () generates a drive signal for the resonance circuit () and a message receiver () is arranged to receive messages from the power receiver (). A power loop controller () implements a power control loop by adapting the power of the drive signal in response to power control messages received from the power receiver (). However, the regulation is subject to a constraint of at least one of a current or voltage of the resonance circuit and a power of the drive signal being below a maximum limit. Further, the power transmitter () comprises an adapter () which adapts the maximum limit in response to a load indication indicative of a loading of the power transfer signal by the power receiver ().

Wireless inductive power transfer

A power transmitter () comprises a transmitter coil () for generating the power transfer signal during a power transfer phase. A driver () generates a drive signal for the transmitter coil () to generate the power transfer signal during the power transfer phase. A communicator () receives messages from the power receiver () and a controller () is arranged to, during the power transfer phase, generate a reduced power time interval during which a power level of the power transfer signal is reduced where the reduced power time interval is generated in response to the communicator () receiving a reduced power time interval request message from the power receiver (). The power receiver () may generate a request message when e.g. a change in operating mode occurs. The power receiver () may ensure that a request message, and thus a reduced power time interval, is only generated when the power receiver can handle a power interruption for the power transfer signal.

A power transmitter () provides power to a power receiver () via an electromagnetic power transfer signal. The power transmitter () comprises an output circuit () with a transmitter coil () generating the power transfer signal in response to a drive signal generated by a driver (). A configuration controller () switches between power transfer configurations having different maximum power limits and voltage amplitudes for the drive signal. A transmitter () transmits a power configuration message to the power receiver () comprising data indicative of a voltage amplitude for a first power transfer configuration a receiver () receives a power transfer configuration change request message from the power receiver (). The configuration controller () switches the power transmitter () to the first power transfer configuration in response to the power transfer configuration change request message. The approach allows a power transmitter and receiver to collaborate to change power transfer configurations providing different maximum power limits.

The invention proposes a method of encoding data packet by encoding type information and size information of said data packet into the same field. The invention also proposes a method of processing data packets received. The data packet comprises a header part and a message part. The header part comprises at least one bit for indicating the type of said data packet, said method comprising a stepof obtaining the size information of said data packet based on said at least one bit.

Method and device for processing data packets

A wireless power transfer system comprises at least one power receiver () for receiving a power transfer from the power transmitter () via a wireless inductive power transfer signal. Configurers () of the power transmitter and receiver may perform a configuration process to determine a set of power transfer parameter values which are used in a first power transfer. The power transfer parameter values and a first identity for the first power receiver () are stored. After a detection of an absence of the power receiver by a first controller (), a detector () may detect a presence of a candidate power receiver. If the candidate power receiver is detected within a given duration and has an identity matching the first identity, an initialization processor () initializes a second power transfer using the set of stored parameter values. Otherwise it discards the set of stored parameter values.

A wireless power transfer system comprises a power transmitter () wirelessly providing power to a power receiver () via an electromagnetic power transfer signal. The power transmitter () comprises a transmitter coil () generating the power transfer signal and a driver () generating a drive signal for the transmitter coil () to generate the power transfer signal. A foreign object detector () executes a foreign object detection operation arranged to detect a presence of a foreign object in response to a property of the drive signal. A communicator () receives a power operating point indication from the power receiver () which represents a load power for a load of the power receiver (). An adapter () adapts the foreign object detection operation in response to the operating point indication being indicative of a change in the load power meeting a criterion.

A wireless power transfer system includes a power receiver () receiving a power transfer from a power transmitter () via a wireless inductive power transfer signal. The power transmitter () comprises a transmit power coil () generating the power transfer signal. A test signal coil () coupled to a test signal generator () generates a magnetic test signal. A plurality of spatially distributed detection coils () is coupled to measurement unit () generating a set of measurement values reflecting signals induced in the detection coils () by the magnetic test signal. A processor () determines a measurement spatial distribution of the measurement value where the spatial distribution reflects positions of the detection coils (). A foreign object detector () detects a presence of a foreign object in response to a comparison of the measurement spatial distribution to a reference spatial distribution. The foreign object detector () is arranged to determine the reference spatial distribution in response to data received from the power receiving device ().

Foreign object detection in a wireless power transfer system

A power transmitter () for a wireless power transfer system comprises a transmitter coil () and a driver () generates a drive signal for the transmitter coil () employing a repeating time frame with a power transfer time interval and a foreign object detection time interval. A test generator () generates a test drive signal for a test coil () during the foreign object detection time interval. A foreign object detector () performs a foreign object detection test based on a measured parameter for the test drive signal. Prior to entering a power transfer phase, an adapter () controls the power transmitter () to operate in a foreign object detection initialization mode in which a preferred value of a signal parameter for the test drive signal is determined in response to at least a first message received from the power receiver (). During the foreign object detection time interval the signal parameter of is set to the preferred value.

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Eindhoven, Netherlands

Antonius Adriaan Maria Staring