Induction Warmer Station with Load-Responsive Frequency Control
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Solution Overview
Problem
Conventional food warmer stations are energy inefficient and provide constant power levels regardless of the amount of food held, leading to inefficient heat transfer and potential overheating.
Innovation Solution
An induction warmer station with a controller that adjusts the frequency of the induction coil based on the surface area of the load material, using a feedback control loop to maintain a constant power-per-unit-surface-area, thereby optimizing heat delivery to food items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If conventional resistive heaters or heat lamps are used to maintain constant temperature, then the warmer operates continuously at constant power level, but energy efficiency deteriorates because only a small portion of heat is transferred to food items and power level does not adjust to food amount
Solution Approach 1:
The system uses a load sensor to detect the weight of food items on the cooktop and feeds this information back to the controller. The controller then adjusts the power level of the heating element accordingly, reducing power when food amount is small and increasing power when food amount is large, thereby optimizing energy efficiency while adapting to different food amounts
Solution Approach 2:
The heating system transitions from a static constant power operation to a dynamic power adjustment system. The controller continuously monitors the load sensor output and dynamically modifies the heating power level in real-time based on the detected food weight, enabling the system to adapt efficiently to varying food amounts
2Ease of operation
If constant power level is maintained regardless of food amount, then the heating system is simple to operate, but overheating occurs when small portions are heated at high power levels
Solution Approach 1:
The load sensor provides continuous feedback to the controller about the food weight. The controller uses this feedback to automatically adjust the power level, preventing overheating of small portions by reducing power when the detected load is small, while maintaining simple operation as the adjustment occurs automatically without user intervention
3Use of energy by moving object
If induction coil frequency is adjusted based on load material surface area, then targeted warmth proportional to food item size is achieved, but device complexity increases due to frequency control mechanisms
Solution Approach 1:
The system employs a feedback control loop where the load sensor detects food weight, the controller processes this information, and adjusts the induction coil frequency accordingly. This feedback mechanism enables targeted heat delivery proportional to food item size while managing complexity through automated control logic
Solution Approach 2:
The system changes the operating frequency parameter of the induction coil based on the detected load. By adjusting the frequency rather than using multiple heating zones or complex mechanical systems, the patent achieves efficient targeted heating while keeping the overall device structure relatively simple
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 induction warmer station efficiently provides targeted warmth proportional to the size of the food items, enhancing energy efficiency and preventing overheating, while maintaining consistent heating for various food sizes and types.
Implementation Method 1
an induction coil positioned in the housing adjacent the cooktop
Implementation Method 2
heating the load material at a ratio of power to the amount of load material
Implementation Method 3
heating the load material at a ratio of power to the amount of load material
Data Source
AI summary
An induction warmer station includes a housing, a cooktop coupled to the housing, an induction coil positioned in the housing adjacent the cooktop, and a controller configured to adjust the frequency of a current input to the induction coil based on an indication of a response of an output current from the induction coil to a change in surface area of load material placed on the cooktop.