Induction Cooktop Vessel Sensor With Battery-Free Coil Identification
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Solution Overview
Problem
Induction cooktops pose challenges in controlling heating intensity due to invisible electric currents, and existing temperature detection devices risk battery explosion and fail to identify the correct coil for multiple-coil cooktops.
Innovation Solution
An electronic device with a magnetic harvester circuit generates electric energy from the induction cooktop's magnetic field, powering a temperature sensor and communication circuit to transmit temperature data to the cooktop, eliminating the need for a battery and enabling coil identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery is used to power the temperature sensor, then the temperature detection function can be maintained, but there is a danger of battery explosion due to increased temperature around the electronic device during cooking
Solution Approach 1:
The patent removes the battery component from the electronic device attached to the cooking vessel. Instead of using a battery to power the temperature sensor, the device utilizes the magnetic field generated by the induction cooktop's coil to induce current in a coil within the electronic device, thereby eliminating the harmful battery component while maintaining power supply for temperature detection
Solution Approach 2:
The patent introduces an intermediate energy transfer mechanism using electromagnetic induction. The magnetic field from the induction coil serves as an intermediary to transfer energy to the electronic device's coil, which then generates current to power the temperature sensor, avoiding direct battery contact with the high-temperature environment
2Adaptability or versatility
If multiple coils are used on the induction cooktop, then cooking versatility is improved, but it becomes difficult to identify which coil corresponds to the detected temperature
Solution Approach 1:
The patent implements a feedback mechanism where the electronic device transmits not only temperature data but also identification information about which cooking vessel it is attached to. The control circuit receives this feedback and uses it to determine which coil corresponds to the detected temperature, enabling proper coil selection for control
Solution Approach 2:
The communication interface in the electronic device is designed to transmit multiple types of information universally - both temperature data and vessel identification data - through the same communication channel, allowing the system to handle multiple coils without requiring separate identification mechanisms
3Measurement precision
If the electronic device is placed close to the cooking vessel for accurate temperature detection, then measurement precision is improved, but the risk of battery exposure to high temperature increases
Solution Approach 1:
By removing the battery from the electronic device, the patent eliminates the component most vulnerable to high temperature damage, allowing the device to be placed closer to the cooking vessel for accurate temperature detection without risking battery safety
Solution Approach 2:
The electronic device uses the magnetic field from the induction cooktop itself to generate the current needed to power its temperature sensor, rather than relying on an external battery. This self-powered approach eliminates the need for battery protection while enabling close proximity operation for accurate measurement
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 allows for safe, efficient temperature control and accurate coil identification, ensuring proper heating intensity and preventing battery explosions, while maintaining a safe distance from the induction coils.
Implementation Method 1
a magnetic harvester circuit configured to generate electric energy based on a magnetic field generated from the induction cooktop
Implementation Method 2
can apply an electric current to the coil to generate a magnetic field around the coil, whereby a cooking vessel can be heated by an eddy current caused by a change in the magnetic field
Data Source
AI summary
According to various embodiments, an electronic device attachable to and detachable from a side of a cooking vessel that is heated based on a magnetic field generated from an induction cooktop includes: a magnetic harvester circuit configured to generate electric energy based on the magnetic field generated from the induction cooktop based on the electronic device being attached to the side of the cooking vessel; a temperature sensor configured to be driven based on the electric energy and configured to detect a temperature; and a communication circuit configured to transmit the temperature to the induction cooktop.