Power reception device, control method, non-contact power supply system, and control program

The power receiving device controls semiconductor switching elements in supply and protection modes to manage peak current, ensuring safe operation and reducing the risk of circuit element failure.

WO2026116077A1PCT designated stage Publication Date: 2026-06-04DENSO CORP
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
DENSO CORP
Filing Date
2025-11-11
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing non-contact power supply systems face the risk of peak current flow through the circuit when a transistor is turned on to protect circuit elements during abnormalities, potentially exceeding rated current and voltage limits.

Method used

The power receiving device employs a control circuit that operates in both supply and protection modes, controlling the transition time of semiconductor switching elements to suppress peak current by setting the transition time of the first signal to be longer than that of the second signal, especially in protection mode, forming a current path to divert excess current.

Benefits of technology

This configuration effectively suppresses peak current generation, protecting circuit elements and preventing voltage and current overload, thus avoiding increased manufacturing costs and noise generation.

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Abstract

A power reception device (80) comprises: a first semiconductor switching element (SWp) capable of electrically connecting a first transmission path (TLa) connected to one end (L2a) of a power reception coil and a second transmission path (TLb) connected to the other end (L2b) of the power reception coil; and a second semiconductor switching element (QIH). A first time required to transition to a first on-voltage for turning on the first semiconductor switching element in a protection mode is set longer than a second time required to transition to a second on-voltage for turning on the second semiconductor switching element in a supply mode.
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