Cooking Appliance Integrating RF and Induction Heating
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Solution Overview
Problem
Existing cooking appliances that combine multiple heating methods, such as microwave and induction heating, face challenges in achieving uniform heating and maximizing heating efficiency due to complex structures and limitations in accommodating both methods simultaneously, leading to poor performance and increased space occupation.
Innovation Solution
A cooking appliance that integrates electrode-type RF heating and induction heating methods, featuring a housing with a cavity, RF generator, RF matcher, working coil, and dual plates that function as electrodes for RF heating and intermediate heaters for induction, allowing for adjustable plate heights and convection heat supply, to optimize heating efficiency and simplify the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple heating methods (microwave and induction) are combined in a cooking appliance, then heating efficiency and versatility are improved, but device complexity and structural requirements increase
Solution Approach 1:
The patent combines microwave heating and induction heating systems into a single cooking appliance. The microwave generator and induction coil are integrated within the same housing, allowing both heating methods to operate simultaneously or independently. This merging of functions improves heating efficiency and versatility while managing device complexity through shared structural components.
Solution Approach 2:
The cooking appliance is designed to perform multiple heating functions using different methods. The same cavity and heating chamber serve both microwave and induction heating operations, making the device universal. Users can select different heating modes (microwave only, induction only, or combined) based on cooking requirements, maximizing the utility of a single appliance.
2Reliability
If microwave shielding structures are added to accommodate both microwave and induction heating, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent extracts and separates the electromagnetic shielding function into specific localized areas where interference occurs. Rather than implementing comprehensive shielding throughout the entire device, shielding structures are strategically placed only where microwave and induction fields interact, reducing unnecessary complexity while maintaining reliability.
Solution Approach 2:
The patent introduces electromagnetic shielding structures as intermediary elements between the microwave generator and induction coil. These shielding components act as mediators that control electromagnetic field interaction, preventing interference while allowing both heating methods to function effectively in the same appliance.
3Speed
If high frequency microwaves are used for heating, then heating speed is improved, but heating uniformity deteriorates due to short wavelength penetration
Solution Approach 1:
The patent merges microwave heating and induction heating to compensate for the limitations of each method. Microwave provides rapid heating through dielectric heating of water molecules, while induction heating provides uniform heat distribution through eddy currents in the cookware. The combination allows fast heating while maintaining uniformity across the entire cooking surface.
Solution Approach 2:
The patent changes the heating parameters by using different frequency ranges and power levels for microwave and induction heating. Microwave operates at higher frequencies for rapid energy absorption, while induction uses lower frequencies that penetrate deeper into the cookware, creating complementary heating patterns that improve overall uniformity.
4Manufacturing precision
If a turntable is introduced to improve heating uniformity, then heating distribution is improved, but induction heating capability is reduced due to placement limitations
Solution Approach 1:
The patent segments the heating system into separate functional zones: a rotating turntable area optimized for microwave heating and a stationary induction coil area optimized for induction heating. This segmentation allows the turntable to rotate food items for uniform microwave exposure without interfering with the induction coil's ability to generate magnetic fields for induction heating of compatible cookware.
Solution Approach 2:
The patent adds rotational motion as an additional dimension to microwave heating through the turntable, while keeping the induction heating zone stationary. This dimensional addition improves microwave heating uniformity without compromising induction heating capability, as the two systems operate in different spatial and operational dimensions within the same appliance.
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 appliance achieves uniform heating by combining RF and induction methods, reducing cooking time and energy consumption while simplifying the structure, allowing for efficient heating of food without the need for complex electromagnetic shielding and frequency adjustments.
Implementation Method 1
The microwave oven is a high frequency heating-type cooking appliance, uses a molecule (e.g., H2O) that vibrates violently and generates heat in a high frequency electric field
Implementation Method 2
the induction heating-type cooktop can use magnetic fields generated around a coil when high-frequency power having a predetermined intensity is applied to the coil to generate eddy current in the object to be heated
Implementation Method 3
generate eddy current in the object to be heated, which is made of a metal, thereby heating a container containing food itself
Implementation Method 4
a convection module configured to supply convection heat to the cavity through one surface of the cavity
Data Source
AI summary
A cooking appliance can include a housing including a cavity; a door connected to the housing and configured to open and close the cavity; a radio frequency (RF) generator configured to generate RF power for generating electric fields in the cavity; an RF matcher configured to match an impedance of the RF power with a load of the cavity. Also, the cooking appliance can further include a working coil configured to emit magnetic fields toward the cavity.