Wireless power transfer system, program, control method for wireless power transfer system, power receiver, and power transmitter

By encoding the requested power in a bit sequence with a smaller value dominant and larger value recessive, the system ensures that power supplied to the receiving antenna matches the requested power, addressing the issue of excessive power supply due to interference from nearby vehicles.

WO2026115841A1PCT designated stage Publication Date: 2026-06-04DENSO CORP +2
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
DENSO CORP
Filing Date
2025-09-03
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

The existing wireless power transfer systems face issues where the power supplied to a power receiving antenna exceeds the requested power due to interference from nearby vehicles, leading to potential overcharging or excessive power supply.

Method used

The system encodes the requested power into a bit sequence with a relatively smaller value being dominant and a larger value recessive, and includes this encoding in a specific signal, which is decoded to ensure that the power supplied matches the requested power, even in the presence of interference from nearby vehicles.

Benefits of technology

This approach effectively suppresses the occurrence of excessive power supply to the receiving antenna, ensuring that the power supplied remains within the requested limits, preventing overcharging.

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Abstract

A power-receiver control unit (230) encodes a requested power into a bit sequence such that a relatively smaller value is dominant and a relatively larger value is recessive in each value of the bit sequence, and includes the encoded requested power in a specific signal. The power-receiver control unit supplies the specific signal including a power supply request signal and the requested power to a power-receiver communication coil (170). A power-transmitter control unit (70) determines whether there is a power supply request based on an output signal of a power-transmitter communication coil (40), and decodes the encoded requested power. On condition that the power-transmitter control unit determines that there is a power supply request, the power-transmitter control unit energizes a power transmitter coil (22) so that power supplied from the power transmitter coil to a power receiver coil (102) becomes the decoded requested power.
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