Heating Element Resistance Control for Sensorless Temperature Regulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heating control systems in food processors struggle to reliably maintain temperature, especially with inhomogeneous media, leading to potential hotspots and burning issues due to the reliance on separate temperature sensors.
Innovation Solution
A method utilizing the electrical resistance of the heating element as a basis for temperature control, where the resistance value is determined and used to evaluate and adjust the heating operation, eliminating the need for additional temperature sensors and allowing for precise temperature management through varying switching frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate temperature sensors are used for heating control, then temperature measurement is available, but the system complexity increases and temperature cannot be reliably maintained due to hotspots
Solution Approach 1:
The heating element serves dual functions: it both heats the medium and acts as the temperature sensor through its own resistance measurements. The control unit determines the temperature of the heating element by evaluating its electrical resistance, eliminating the need for separate temperature sensors and achieving reliable temperature control without hotspots.
2Measurement precision
If separate temperature sensors are used, then temperature monitoring is possible, but additional sensors and sensor technology are required
Solution Approach 1:
The heating element is designed to perform multiple functions: it serves as both the heating source and the temperature sensing element. By measuring the electrical resistance of the heating element itself, the system obtains accurate temperature information without requiring additional dedicated temperature sensors or complex sensor technology.
Solution Approach 2:
The patent combines the heating function and temperature sensing function into a single component - the heating element. The electrical resistance of the heating element, which naturally varies with temperature, is utilized as the sensing mechanism, merging what were previously separate functions into one integrated system.
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 resistance properties of the heating element, allowing for precise temperature setting and monitoring without additional sensors.
Implementation Method 1
Detection of an electrical resistance of the heating element so that at least one resistance value is determined
Implementation Method 2
the at least one determined resistance value is evaluated by an evaluation device, and in particular a temperature of the heating element is determined using the at least one determined resistance value
Data Source
AI summary
The invention relates to a method for operating a heating element (210), in particular in a food processor (1) for the at least partially automatic preparation of foodstuffs, wherein the following steps are performed: a) detecting an electrical resistance of the heating element (210) such 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 to perform the heating operation depending on a temperature of the heating element (210).