Induction Heating Coil Priority Detection
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Solution Overview
Problem
Induction heating cookers with multiple heating coils arranged in a matrix shape face challenges in efficiently detecting cooking vessels due to high power and time requirements, increased device size, heat generation issues, and relay durability problems, especially when applying high-frequency currents for simultaneous detection across all coils.
Innovation Solution
An induction heating device with a priority determination unit that selectively applies high-frequency currents to heating coils based on the likelihood of a cooking vessel's presence, reducing unnecessary power consumption and relay switching, and incorporating detection auxiliary units like temperature or electrostatic capacity detection to streamline the cooking vessel detection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency current is applied to all heating coils simultaneously for cooking vessel detection, then detection speed is improved, but power consumption increases and relay durability deteriorates
Solution Approach 1:
The patent applies periodic action by implementing sequential detection cycles where high-frequency current is applied to heating coils in turns rather than simultaneously. The detection unit performs detection operations for each heating coil at predetermined intervals, reducing overall power consumption while maintaining effective detection capability across all coils.
Solution Approach 2:
The patent segments the detection process by dividing the plurality of heating coils into groups that are detected sequentially. Instead of applying high-frequency current to all coils simultaneously, the system divides them and processes them in separate time intervals, reducing peak power consumption and relay switching burden.
2Measurement precision
If high-frequency current is applied to all heating coils for simultaneous detection, then detection completeness is improved, but device size increases due to additional circuits
Solution Approach 1:
The patent implements universality by making a single high-frequency current application unit serve multiple heating coils sequentially. The same detection circuit and high-frequency current source are reused for each coil in turn, eliminating the need for separate dedicated circuits for each coil while maintaining complete detection coverage.
3Measurement precision
If detection operation is performed for all heating coils, then detection accuracy is improved, but heat generation increases causing coil burn risk
Solution Approach 1:
The patent applies periodic action by performing detection operations at predetermined intervals rather than continuously for all coils. High-frequency current is applied to each heating coil only when its turn comes in the sequential detection cycle, reducing cumulative heat generation while maintaining detection accuracy through periodic monitoring.
4Adaptability or versatility
If relay switching is used to apply high-frequency current to different heating coils, then adaptability is improved, but relay durability deteriorates
Solution Approach 1:
The patent reduces relay durability issues by implementing periodic detection cycles with extended intervals between switching operations. The relay switches between coils only when needed for sequential detection rather than continuous switching, significantly reducing the number of switching cycles and improving relay lifespan while maintaining adaptability.
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
The solution enables quick and efficient cooking vessel detection with reduced power consumption, improved relay durability, and enhanced user experience by prioritizing detection operations based on the likelihood of vessel placement, thus optimizing the induction heating process.
Implementation Method 1
a plurality of heating coils 3 arranged closely to each other and generating a magnetic field for heating the cooking vessel 1
Implementation Method 2
an induction heating device inductively heating a cooking vessel such as a metal cooking pot placed on a top plate
Implementation Method 3
a method of applying a current to each of the heating coils at a frequency higher than that of heating so as to determine whether a load is placed thereon from a heating coil current value etc.
Data Source
AI summary
An induction heating device including: a top plate on which a cooking vessel heating a cooked object; a plurality of heating coils arranged closely to each other and generating a magnetic field for heating the cooking vessel; a heating control unit that controls a high-frequency current applied to each heating coil of the plurality of the heating coils to control a heating power of the cooking vessel; a cooking vessel detection unit that performs a detection operation of a cooking vessel for detecting whether the cooking vessel is placed over the heating coils; an operation unit that displays a detection result of the cooking vessel detection unit; and a priority determination unit that determines for each heating coil of the plurality of the heating coils a priority of a heating coil for which the cooking vessel detection unit detects whether the cooking vessel is placed thereon, wherein the cooking vessel detection unit that performs for each of the heating coils a detection operation of a cooking vessel in terms of whether the cooking vessel is placed thereon, based on the priority determined by the priority determination unit.