Induction heating device including sensor for detecting position of object to be heated

The induction heating device uses a sensor coil with a capacitance element and oscillation circuit to overcome noise interference from heating coils, enabling precise and cost-effective position detection of workpieces without disrupting heating operations.

WO2026117093A1PCT designated stage Publication Date: 2026-06-04SAMSUNG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Filing Date
2025-11-28
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Induction heating devices face challenges in high-precision position detection of a workpiece due to strong voltage noise interference from heating coils, which disrupts the operation of position detection sensors and increase manufacturing costs.

Method used

The induction heating device employs a sensor coil with a capacitance element and an oscillation circuit, coupled with an inverting amplifier and frequency detection circuit, allowing for precise position detection without interrupting the heating coil's power supply, thereby reducing noise interference and manufacturing costs.

Benefits of technology

Enables stable and continuous position detection of a workpiece on the induction heating device's top plate, maintaining heating operations while minimizing noise interference and component protection circuit requirements, thus reducing overall costs.

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Abstract

Provided is an induction heating device for reducing noise. An induction heating device according to one embodiment disclosed herein may comprise: a sensor coil for detecting an object to be heated; an oscillation circuit including a first capacitive element connected to a first terminal of the sensor coil, a second capacitive element connected to a second terminal of the sensor coil, an input terminal connected to the second terminal of the sensor coil, and an inverting amplification circuit having an output terminal connected to the first terminal of the sensor coil through the first capacitive element; and a frequency detection circuit for detecting the frequency of a signal output by the oscillation circuit.
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Citation Information

Patent Citations

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