Radiant Hob Heating Control Using Safety Limiter Switch-On Time
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Solution Overview
Problem
Existing safety temperature limiters in cooking devices cannot adjust the activation state of radiant heating devices based on processes in cooking vessels, leading to potential overheating and safety risks, such as grease fires or damage to cookware.
Innovation Solution
Integrating a safety temperature limiter as a prefabricated structural unit with the radiant heating device, which monitors the first switch-on time and compares it to a predefined limit, reducing power or deactivating the heating device if it exceeds a predetermined time, and providing optical and acoustic indicators to alert operators of potential dangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety temperature limiter is used to protect against overheating, then reliability is improved, but the heating device cannot adapt to cooking processes in real-time
Solution Approach 1:
The control device continuously monitors the temperature via the safety temperature limiter and adjusts the heating power dynamically. When the temperature approaches the switch-off temperature, the control device reduces power in steps before full switch-off, creating a feedback loop that adapts heating to real-time cooking conditions while maintaining safety protection.
Solution Approach 2:
The heating device transitions from static temperature protection to dynamic power adjustment. The control device modulates heating power based on real-time temperature measurements, enabling continuous adaptation to cooking processes while maintaining the safety threshold established by the temperature limiter.
2Reliability
If the safety temperature limiter directly switches off the heating device at switch-off temperature, then protection effectiveness is improved, but cooking processes cannot be optimized
Solution Approach 1:
The control device performs preliminary power reduction in defined steps before the safety temperature limiter triggers full switch-off. This progressive power adjustment prevents abrupt termination of cooking processes and allows optimization of cooking conditions while maintaining safety margins below the switch-off temperature.
Solution Approach 2:
Instead of immediate full switch-off, the control device applies partial power reduction in graduated steps. This partial action approach maintains sufficient heating power for effective cooking while staying within safe temperature margins, optimizing both safety and cooking efficiency.
3Productivity
If the radiant heating device operates at high power continuously, then productivity is improved, but risk of harmful effects increases
Solution Approach 1:
The system continuously monitors temperature and provides feedback to the control device, which adjusts heating power accordingly. This feedback mechanism maintains high productivity when temperatures are safe while automatically reducing power when approaching dangerous thresholds, preventing grease fires and cookware damage.
Solution Approach 2:
The control device takes preliminary protective action by reducing power in steps before the temperature reaches dangerous levels. This preemptive power adjustment prevents harmful effects such as grease fires and cookware damage while maintaining efficient cooking during safe temperature ranges.
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 solution ensures safer operation by preventing overheating and reducing the risk of fires or cookware damage by adjusting power levels based on the contents of the cooking vessel, while allowing operators to react to potential hazards.
Implementation Method 1
it can run, at least by way of an elongate temperature detecting element or a temperature detecting device, between the radiant heating device or its heating conductors and the hob plate
Implementation Method 2
a radiant heating device as the heating device... The active region of the radiant heating device or its heating conductors upward through the hob plate into a cooking vessel
Implementation Method 3
The safety temperature limiter is designed as a thermomechanical functional device in order to deactivate the radiant heating device when an excessively high temperature or a switch-off temperature is reached
Data Source
AI summary
A hob plate above a radiant heating device and a safety temperature limiter between said radiant heating device and hob plate, which safety temperature limiter is designed to deactivate the radiant heating device when a switch-off temperature is reached. To actuate the radiant heating device, a cooking vessel is first placed on the hob plate above the radiant heating device and then the radiant heating device is activated and at the same time detection of a first switch-on time starts. When a switch-off temperature is reached at the safety temperature limiter, the radiant heating device is deactivated by said safety temperature limiter. The first switch-on time that has elapsed up to that point between activation and deactivation of the radiant heating device is detected and compared with a predefined limit switch-on time. If the first switch-on time lies below the limit switch-on time the radiant heating device is switched off.