Induction Hob Controller for Boiling State Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing induction hobs lack convenient and operator-controlled functions for efficiently heating water to specific boiling states, such as 'lightly boiling' and 'vigorous boiling', which are essential for various cooking tasks but often require manual power adjustments and lack automatic monitoring of temperature profiles.
Innovation Solution
An induction hob method that automatically detects the 'lightly boiling' state by monitoring the relative temperature profile of the cooking vessel base and adjusts power density to maintain this state for a predetermined time, offering operators a hold option to prevent excessive bubbling, while allowing for easy transition to 'vigorous boiling' when needed, using a controller to manage power settings and provide visual or acoustic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high power density is used to heat water quickly, then heating speed is improved, but excessive bubbling and vigorous boiling occurs which is undesirable for delicate foods
Solution Approach 1:
The system continuously monitors the temperature profile of the cooking vessel base and uses this feedback to automatically adjust the power density. When the temperature profile indicates that water is approaching boiling point (detected by characteristic temperature patterns), the controller automatically reduces power density to prevent excessive bubbling, thereby maintaining gentle heating suitable for delicate foods while initially providing fast heating.
Solution Approach 2:
The power density is made dynamically adjustable based on real-time temperature monitoring. The system transitions from high power density for rapid heating to lower power density when boiling is detected, allowing the heating process to adapt to the current state of the water and cooking vessel, thus preventing excessive bubbling while maintaining heating efficiency.
2Manufacturing precision
If manual power adjustment is required to control boiling state, then cooking precision is improved, but ease of operation deteriorates due to complex manual control
Solution Approach 1:
The system performs automatic monitoring and control of the heating process without requiring manual intervention. The controller continuously tracks the temperature profile and autonomously adjusts power density to maintain the desired boiling state, eliminating the need for users to manually adjust power settings while preserving precise control over the cooking process.
Solution Approach 2:
The system uses real-time temperature profile feedback to automatically regulate heating power, replacing manual power adjustment with an automated control loop that maintains precise control over the boiling state while simplifying user interaction to merely placing the cooking vessel on the hob.
3Extent of automation
If automatic temperature monitoring is implemented, then cooking control is improved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical temperature measurement devices with electronic sensing that utilizes existing operational parameters of the induction heating coil. By analyzing oscillation characteristics and electrical properties of the coil during heating, the system derives temperature information without requiring separate temperature sensors or complex measurement apparatus, thus achieving automatic monitoring with minimal additional complexity.
4Loss of energy
If power density is continuously adjusted to maintain boiling state, then energy efficiency is improved, but loss of time occurs during state transitions
Solution Approach 1:
The system detects early temperature profile changes that indicate approaching boiling point and proactively reduces power density before full boiling occurs. This preliminary action prevents the need for large power adjustments later, enabling smoother transitions between heating states and reducing both energy waste and transition time while maintaining efficient energy utilization throughout the heating process.
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
Enables precise control over boiling states, reducing energy consumption and preventing unwanted vigorous boiling, allowing for efficient cooking of delicate foods like potatoes and eggs while enabling quick escalation to full boil when required, thus enhancing user convenience and cooking flexibility.
Implementation Method 1
A controller (20) of the induction hob (11) drives the at least one induction heating coil (15) to inductively heat the cooking vessel (18)
Implementation Method 2
An oscillation response of the induction heating coil is advantageously used as an operating parameter. This operating parameter or these operating parameters is/are evaluated in order to detect or to monitor a relative temperature profile of the temperature of the cooking vessel base
Data Source
AI summary
In order to heat water in a cooking vessel which is placed above at least one induction heating coil of an induction hob, a controller drives the induction heating coil with a prespecified relatively high power density. During the heating, operating parameters of the induction heating coil are detected and evaluated by the controller in order to monitor a relative temperature profile of the temperature of a cooking vessel base. As soon as this relative temperature profile levels off to a considerable extent or a gradient of the relative temperature profile decreases, the controller identifies this and determines this as the situation of a “lightly boiling” state and of a temperature of a top side of the cooking vessel base which is 5° C. to 15° C. below the boiling point being reached. The power density is then automatically reduced for a predetermined hold time, wherein an operator can maintain this state or, after a certain time, heating up can be performed to a greater extent again automatically.