Electronic temperature safety control for a heating element
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Solution Overview
Problem
Existing control systems for household appliances with heating elements fail to adequately prevent overheating due to component failures, posing risks of injury or property damage, as they lack effective redundant safety mechanisms.
Innovation Solution
A dual safety component system comprising a first safety component that shuts down the heating function at a threshold temperature and a second component that takes over if the first fails, utilizing electric switches or fuses connected in series to ensure continuous safety, integrated with digital temperature control circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single safety component is used to stop the heating function at a threshold temperature, then the device can prevent overheating, but the safety mechanism becomes unreliable if the component fails
Solution Approach 1:
The patent implements a second safety component that serves as a backup protection mechanism, anticipating the possibility of the first safety component failing. This redundant safety layer is built in advance to cushion against the harmful effects of component failure, ensuring that even if the primary safety mechanism fails, the heating element will still be protected from dangerous overheating conditions.
Solution Approach 2:
The patent applies different temperature thresholds to different safety components - the first safety component operates at a lower threshold temperature while the second operates at a higher threshold temperature. This local differentiation in operational parameters allows the system to provide layered protection, with each component optimized for its specific protective function at different stages of temperature escalation.
2Reliability
If redundant safety mechanisms are implemented, then safety reliability improves, but the device complexity increases
Solution Approach 1:
The safety control system is segmented into distinct functional components: a digital temperature control system with a processor, a first safety component (such as a thermostat or thermal cutoff), and a second safety component (such as a thermal fuse). Each segment operates independently with its own triggering mechanism, allowing the system to achieve redundancy without requiring complex interconnections between safety components. This modular segmentation maintains reliability while controlling overall system complexity.
Data Source
AI summary
A temperature control system for appliances, such as an electric grill, air fryer, vacuum blender, convection oven, induction cooker (e.g., wok), coffeemaker, etc. The control system comprises digital circuitry for controlling temperature of the appliance, and includes a first safety component in the circuitry for stopping the heating function at a threshold parameter, such as a maximum temperature, and a second safety component in the circuitry for stopping the heating function at a second threshold temperature if the first safety component fails at the first threshold temperature. The first and second safety components, preferably switches or fuses, are connected in series to establish a redundant safety mechanism.