Power receiving device, contactless power supply system, method for searching for resonant frequency

The power receiving device autonomously identifies its resonance frequency using an internal search voltage mechanism, addressing the challenge of manufacturing errors in coils and capacitors, enabling quick and efficient power supply.

JP2026105710APending Publication Date: 2026-06-26OMRON CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
OMRON CORP
Filing Date
2024-12-16
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing power receiving devices face challenges in accurately determining their resonance frequency due to manufacturing errors in coils and capacitors, requiring time-consuming power transmission to identify the resonance frequency, and are unable to do so independently without external power.

Method used

The power receiving device includes a resonant circuit with an application circuit to change the search voltage frequency, a measurement unit to measure impedance changes, and a determination unit to identify the resonant frequency without external power transmission, allowing it to store and communicate the frequency for quick power supply initiation.

Benefits of technology

Enables the power receiving device to determine its own resonant frequency autonomously, facilitating rapid and efficient power transmission by the power transmission device at the appropriate frequency, reducing power supply losses and preventing overvoltage.

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  • Figure 2026105710000001_ABST
    Figure 2026105710000001_ABST
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Abstract

To realize a power receiving device that can determine its own resonant frequency without a power transmission device. [Solution] The power receiving device (3) includes a resonant circuit (31), an application unit (52) that applies a search voltage to the resonant circuit from inside the power receiving device and changes the frequency of the search voltage, a measurement unit (53) that measures the change in impedance of the resonant circuit in accordance with the change in frequency of the search voltage without power transmission from the power transmitting device, and a determination unit (54) that determines the resonant frequency of the resonant circuit based on the change in impedance.
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