Method for operating a heating element
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Solution Overview
Problem
Conventional heating control systems in food processors struggle to reliably maintain temperature, leading to potential hotspots and burning of inhomogeneous media due to the reliance on separate temperature sensors.
Innovation Solution
A method that uses the electrical resistance of the heating element as a basis for temperature control, eliminating the need for additional sensors by evaluating resistance values to regulate heating operations, allowing for precise temperature management through the use of an electronic controller and varying switching frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate temperature sensors are used for heating control, then temperature measurement capability is provided, but device complexity and cost increase
Solution Approach 1:
The heating element is designed to serve dual functions: as a heating source and as a temperature sensor. The resistance of the heating element changes with temperature, allowing it to provide temperature measurement capability without requiring separate temperature sensors, thus reducing device complexity while maintaining measurement functionality
Solution Approach 2:
The heating element is made multi-functional by utilizing its inherent temperature-dependent resistance property. It simultaneously performs heating and temperature sensing functions, eliminating the need for dedicated temperature sensors and simplifying the overall system structure
2Ease of operation
If conventional heating control is used, then heating operation is simple, but temperature reliability deteriorates due to hotspots
Solution Approach 1:
The system implements feedback control by continuously monitoring the resistance of the heating element, which reflects its temperature. Based on this feedback, the control unit adjusts the heating power to maintain uniform temperature distribution and prevent hotspot formation, thereby improving temperature reliability while keeping the operation simple
3Measurement precision
If additional temperature sensors are installed, then temperature monitoring capability is improved, but cost increases
Solution Approach 1:
The heating element monitors its own temperature through its resistance changes, eliminating the need for external temperature sensors. This self-service approach provides temperature monitoring capability without incurring additional sensor costs, reducing manufacturing expenses while maintaining monitoring precision
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 enables reliable and cost-effective temperature control, reducing the risk of hotspots and burning by using the inherent temperature-dependent resistance of the heating element, allowing for precise temperature setting and monitoring without additional sensors.
Implementation Method 1
detecting an electrical resistance of the heating element, so that at least one resistance value is determined... and in particular a temperature of the Heating element is determined based on the at least one determined resistance value
Implementation Method 2
an energy source, such as an AC voltage source, can be used to transfer energy to the heating element to cause an electrical current to flow through the heating element (to generate heat and heat the medium)
Data Source
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AI summary
The invention relates to a method for operating a heating element (210), in particular in a food processor (1) for at least partially automatic food preparation, wherein the following steps are carried out: a) Detecting an electrical resistance of the heating element (210) so that at least one resistance value is determined, b) Performing a heating operation on the heating element (210) based on the at least one determined resistance value in order to carry out the heating operation as a function of a temperature of the heating element (210).