Wireless induction heating cooker and wireless induction heating system including same

Solution Overview

Problem

Existing wireless induction heating cookers require additional components and increased production costs to detect whether the lid and main body are properly coupled, which can lead to safety issues like explosions or fires due to abnormal coupling.

Innovation Solution

A wireless induction heating cooker that determines the coupling state of the lid based on the power delivered during rotation coupling, using a magnetic field generated by a heating coil to induce currents in a power receiving coil, allowing for abnormality detection without additional physical components and efficiently using power for cooking operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional components (magnetic member and reed switch) are installed to detect lid coupling state, then safety is improved, but device complexity and production cost increase

Engineering Contradiction:

ImprovesafetyVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The heating coil serves dual purposes: it provides heating function and generates magnetic field for detecting lid coupling state through the power receiving coil. This multi-functionality eliminates the need for separate magnetic members and reed switches, resolving the contradiction between safety and device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses its own heating coil's magnetic field for detection purposes, making the system self-sufficient. The power receiving coil detects coupling state by sensing the magnetic field generated during normal heating operation, without requiring additional detection components

Inventive Principle:

Principle #25Self-service

2Reliability

If additional components (magnetic member and reed switch) are installed to detect lid coupling state, then safety is improved, but production cost increases

Engineering Contradiction:

ImprovesafetyVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The heating coil serves dual purposes: it provides heating function and generates magnetic field for detecting lid coupling state through the power receiving coil. This multi-functionality eliminates the need for separate magnetic members and reed switches, resolving the contradiction between safety and device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system uses its own heating coil's magnetic field for detection purposes, making the system self-sufficient. The power receiving coil detects coupling state by sensing the magnetic field generated during normal heating operation, without requiring additional detection components

Inventive Principle:

Principle #25Self-service

3Reliability

If additional wires are installed for electric connection between reed switch and controller, then lid coupling detection is achieved, but productivity decreases

Engineering Contradiction:

Improvelid coupling detectionVSAvoidproductivity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention extracts the detection function from a separate wired system (reed switch with electric connections) and integrates it into the wireless power transfer system. The power receiving coil in the lid detects coupling state wirelessly through magnetic field sensing, eliminating the need for additional wires and improving productivity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical/electrical wired detection system (reed switch with wires) with a wireless electromagnetic field-based detection system. The power receiving coil senses the magnetic field generated by the heating coil to determine coupling state, eliminating the need for physical wire connections

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Accurately detects normal or abnormal coupling states without increasing production costs, preventing explosions or fires by informing users of abnormal lid coupling and efficiently using power from the induction heating apparatus.

Implementation Method 1

using a magnetic field generated by a heating coil to induce currents in a power receiving coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP3700299B1Wireless induction heating cooker and wireless induction heating system including same

Publication Date: 2022.05.04 LG ELECTRONICS INC

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AI summary

Disclosed herein is a wireless induction heating cooker, the wireless induction heating cooker, including: a main body; a lid rotation-coupled to the main body; an internal pot stored in the main body; a first power receiving coil provided on a bottom surface of the main body; a power transmitting coil provided on one lateral surface of the main body and supplied with electric currents induced to the first power receiving coil; a second power receiving coil which is provided on one lateral surface of the lid and to which electric currents are induced by a magnetic field generated in the power transmitting coil; and a control module determining a coupling state of the lid on the basis of an amount of electric currents induced to the second power receiving coil.