Repositionable Electrode for RF Defrosting Volume Control
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Solution Overview
Problem
Conventional capacitive food defrosting systems face inefficiencies due to variations in food load size, leading to uneven defrosting results, as the electric field generated during RF defrosting operations may not effectively extend across the large interior height of heating compartments, resulting in low defrosting efficiency or incomplete defrosting.
Innovation Solution
The introduction of a repositionable electrode that divides the cavity into upper and lower volumes, concentrating the electric field and enhancing defrosting efficiency by allowing the repositionable shelf to be placed at different heights, accommodating loads of varying sizes, and using a balanced or unbalanced RF signal configuration to optimize power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If large planar electrodes are used in conventional capacitive defrosting systems, then the heating compartment can accommodate large food loads, but the electric field cannot effectively extend across the large interior height resulting in low defrosting efficiency
Solution Approach 1:
The patent divides the single large heating compartment into two separate heating zones by introducing a repositionable electrode that creates an upper heating zone and a lower heating zone. This segmentation allows the electric field to be concentrated in smaller, more effective regions while still accommodating large food loads in the overall compartment volume.
Solution Approach 2:
The patent introduces a vertical dimension to the electric field distribution by positioning electrodes at different heights (upper and lower electrodes) rather than relying on a single horizontal plane. This dimensional change enables the electric field to effectively penetrate through the vertical height of the compartment, solving the problem of insufficient field extension across large interior heights.
2Device complexity
If the electrode position is fixed in conventional systems, then the system structure is simple, but variations in food load size result in inefficient defrosting
Solution Approach 1:
The patent implements a repositionable electrode that can be dynamically adjusted to different heights within the heating compartment. This dynamic positioning capability allows the system to adapt to varying food load sizes and shapes, optimizing the electric field distribution for different defrosting scenarios while maintaining relatively simple system structure.
Solution Approach 2:
The repositionable electrode serves multiple functions: it acts as a lower electrode for the upper heating zone, provides structural support for shelf positioning, and enables the system to handle various food load configurations. This multi-functionality increases adaptability without proportionally increasing system 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
This approach ensures efficient and even defrosting by concentrating the RF energy, improving power absorption and defrosting speed, and accommodating different load sizes, thereby enhancing the overall defrosting process.
Implementation Method 1
low power electromagnetic energy is supplied to the electrodes to provide gentle warming of the food load
Implementation Method 2
concentrating the RF energy, improving power absorption and defrosting speed
Data Source
AI summary
A thermal increase system may be coupled to a containment structure for containing a load. The system includes a plurality of shelf support structures disposed within a cavity. The plurality of shelf support structures is configured to support a repositionable electrode at a plurality of positions within the cavity. The system includes a first electrode disposed at a first surface of the containment structure, wherein the repositionable electrode is disposed within the containment structure so as to divide the cavity into separate volumes. The system includes a radio frequency signal source electrically connected to one or both of the first electrode and the repositionable electrode. The radio frequency signal source is configured to provide radio frequency energy to either or both of the first electrode and the repositionable electrode.