Wireless Induction Mini Oven Coil Layout With EM Shielding
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Solution Overview
Problem
Mini ovens with electric heating sources face challenges in portability due to power cables, increased volume and weight when wireless power reception is considered, and efficiency issues due to coil cooling limitations.
Innovation Solution
A mini oven design featuring an induction heating system with a working coil, a receiver coil for wireless power reception, and an electromagnetic shielding plate to minimize electromagnetic interference and facilitate efficient cooling, allowing for compact and portable operation without a power cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power cable is used to supply power to the mini oven, then the oven can operate with stable power supply, but the portability and ease of repositioning are reduced due to cable constraints
Solution Approach 1:
The patent replaces the mechanical power cable connection system with an electromagnetic wireless power transmission system. The receiver coil receives electromagnetic energy from a transmitter coil, enabling power supply without physical cable connection, thus achieving both portability and reliable power supply simultaneously
2Ease of operation
If a receiver coil is added for wireless power reception, then the power cable can be eliminated, but the volume and weight of the mini oven increase
Solution Approach 1:
The patent employs thin-film flexible coil structures and compact electromagnetic components that minimize the volume and weight addition. The receiver coil is designed as a compact planar structure integrated into the oven housing, reducing the overall size increase while maintaining wireless power reception capability
3Volume of moving object
If the receiver coil is disposed compactly to reduce volume, then the portability is maintained, but the coil cooling efficiency is reduced
Solution Approach 1:
The patent introduces a vertically stacked three-dimensional arrangement where the electromagnetic shielding plate is positioned between the receiver coil and working coil. This spatial configuration provides thermal management pathways in the vertical dimension while maintaining compact horizontal footprint, allowing effective cooling without increasing overall volume
4Object-affected harmful factors
If an electromagnetic shielding plate is added between the working coil and receiver coil, then electromagnetic interference is reduced, but the device complexity increases
Solution Approach 1:
The electromagnetic shielding plate serves multiple functions simultaneously: it shields electromagnetic interference between coils, provides structural support as part of the housing assembly, and facilitates thermal management by acting as a heat dissipation pathway. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity
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 design enables a compact, portable, and efficiently cooled mini oven that maintains high heating efficiency while eliminating the need for a power cable, ensuring easy repositioning and minimizing volume and weight increases.
Implementation Method 1
a receiver coil installed adjacent to the base and configured to wirelessly receive power for operating the cooking appliance
Implementation Method 2
a working coil for inductively heating an object in the cooking compartment installed adjacent to the bottom part
Implementation Method 3
an electromagnetic shielding plate provided between the working coil and the receiver coil and configured to shield electromagnetic waves
Data Source
AI summary
Disclosed herein is a cooking appliance. A working coil is provided at a lower portion of the cooking appliance. The working coil heats a tray disposed in a cooking compartment in an IH mode. A receiver coil wirelessly receiving external power is stacked below the working coil. An electromagnetic shielding plate is installed between the working coil and the receiver coil to partition a space in which the two coils are installed. The electromagnetic shielding plate shields an electromagnetic field or electromagnetic waves such that the electromagnetic field or electromagnetic waves in one of the two partitioned spaces does not leak to the other space located across the electromagnetic shielding plate.