Power transmitter device, wireless power transfer system, power supply program, and control method for power transmitter device

The power transmitter device controls wireless power transfer by determining the positional relationship between antennas and adjusting thresholds based on vehicle speed to prevent power supply in misaligned conditions, addressing issues of leakage magnetic fields and efficiency during parking or stopping.

WO2026115878A1PCT 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
2025-09-16
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

When the relative positional relationship between the power transmitter antenna and the power receiver antenna is deviated from an appropriate alignment, there is a risk of increased leakage magnetic fields and reduced power supply efficiency during wireless power transfer, especially when the vehicle is parked or stopped.

Method used

The power transmitter device includes a control unit that determines the appropriateness of the positional relationship by comparing the current magnitude through the power transmitter antenna with a threshold and stops energization when the relationship is not appropriate, adjusting the threshold based on the vehicle's traveling speed to prevent power supply in misaligned conditions.

Benefits of technology

This configuration effectively prevents power supply in misaligned positions, reducing leakage magnetic fields and maintaining power efficiency by stopping power transfer when the positional relationship is inappropriate, particularly when the vehicle is likely to be parked or stopped.

✦ Generated by Eureka AI based on patent content.

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Abstract

A power-transmitter controller (70) of a power transmitter device (20) compares a magnitude of a current flowing through a power transmitter antenna (22) or its correlation value with a threshold, energizes a power transmitter antenna when determining that there is a power supply request based on a power supply request signal received by a power-transmitter communication antenna (40), determines whether the relative positional relationship between the power transmitter antenna and the power receiver antenna (102) is appropriate, and stops the power supply to the power transmitter antenna when determining that the relative positional relationship is not appropriate. On the other hand, the power-transmitter control unit changes, based on a traveling speed signal received by the power-transmitter communication antenna, the threshold to narrow a range of the relative positional relationship that is determined to be appropriate when the traveling speed is lower than a predetermined speed, compared with a case where the traveling speed is not lower than the predetermined speed.
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