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US 2026/0312433 A1Published application
Wireless power transfer
AssigneeKoninklijke Philips N.V.
InventorsAleksei Agafonov, Antonius Adriaan Maria Staring
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Abstract
A power receiver (105) communicates to a power transmitter (101) using load modulation data symbols modulated by a chip sequence being a combination of two binary sequences. The power transmitter (101) comprises a data receiver (207) which includes a chip determiner (903) determining a received chip sequence and two correlators (905, 907) which correlates this sequence with the two binary sequences. The two correlation results are combined into a single correlation value by a combiner (905). A detector (917) detects a received data symbol value in response to the combined correlation value. The approach may provide improved detection of data symbols and improved communication from the power receiver (105) to the power transmitter (101).
Claims24
A power transmitter comprising:
- an output circuit comprising a transmitter coil, wherein the transmitter coil is arranged to generate a power transfer signal in response to a drive signal applied to the output circuit;
- a driver circuit, wherein the driver circuit is arranged to generate the drive signal;
- and
- a data receiver circuit,
- wherein the data receiver circuit is arranged to receive a plurality of load modulation data symbols modulated by at least one modulation chip sequence,
- wherein at least a first modulation chip sequence of the at least one modulation chip sequences is a combination of a first binary chip sequence and a second binary chip sequence;
- wherein the data receiver circuit, comprises:
- a load measurer circuit, wherein the load measurer circuit is arranged to measure loading of the power transfer signal so as to generate measured load values;
- a chip determiner circuit, wherein the chip determiner circuit is arranged to determine a received chip sequence from the measured load values;
- a first correlator circuit, wherein the first correlator circuit is arranged to correlate the received chip sequence with the first binary chip sequence so as to generate a first correlation value;
- a second correlator circuit, wherein the second correlator circuit is arranged to correlate the received chip sequence with the second binary chip sequence so as to generate a second correlation value;
- a detector circuit, wherein the detector circuit is arranged to detect a received data symbol value in response to the first correlation value and the second correlation value.
9 more elements
A power receiver comprising:
- an input circuit comprising a receiver coil, wherein the receiver coil is arranged to extract power from a power transfer signal;
- a data transmitter circuit, wherein the data transmitter circuit is arranged to transmit a plurality of data symbols to the power transmitter by load modulating the power transfer signal,
- wherein each data symbol of the plurality of data symbols is modulated by a sequence of modulation load values corresponding to a chip sequence of a plurality of modulation chip sequences,
- wherein at least one chip sequences of the plurality of chip sequences is linked to a different data symbol value;
- wherein at least one modulation chip sequence of the plurality of modulation chip sequences is a combination of a first binary chip sequence and a second binary chip sequence,
- wherein the least one modulation chip sequence has at least three different chip values.
3 more elements
A method comprising:
- generating a power transfer signal in response to a drive signal;
- receiving a plurality of load modulation data symbols modulated by at least one modulation chip sequence, wherein at least a first modulation chip sequence of the at least one modulation chip sequences is a combination of a first binary chip sequence and a second binary chip sequence;
- measuring loading of the power transfer signal so as to generate measured load values;
- determining a received chip sequence from the measured load values;
- correlating the received chip sequence with the first binary chip sequence so as to generate a first correlation value;
- correlating the received chip sequence with the second binary chip sequence so as to generate a second correlation value;
- and
- detecting a received data symbol value in response to the first correlation value and the second correlation value.
5 more elements
A method comprising:
- extracting power from the power transfer signal;
- transmitting a plurality of data symbols to the power transmitter by load modulating the power transfer signal,
- wherein each data symbol of the plurality of data symbols is modulated by a sequence of modulation load values corresponding to a chip sequence of a plurality of modulation chip sequences,
- wherein at least one chip sequences of the plurality of chip sequences is linked to a different data symbol value;
- wherein at least one modulation chip sequence of plurality of modulation chip sequences is a combination of a first binary chip sequence and a second binary chip sequence,
- wherein the least one modulation chip sequence has at least three different chip values.
3 more elements
Dependencies are inferred from the claim text.