Induction Heating Vessel Detection via Waveform Pulse Counting
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Solution Overview
Problem
Conventional induction heating devices consume excessive power to determine whether a cooking vessel is suitable for induction heating, limiting their ability to accurately and quickly identify the type of vessel.
Innovation Solution
An induction heating device with a cooking vessel sensor that includes a sensing coil and a temperature sensor, where a controller applies a current to the sensing coil to generate a resonant signal, converts it into a square waveform, and determines the type of cooking vessel by comparing the number of pulses with a predetermined reference value, allowing for simultaneous temperature measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined amount of power is supplied to the working coil to determine whether eddy current occurs in the cooking vessel, then the type of cooking vessel can be determined, but excessive power (200 W or more) is consumed
Solution Approach 1:
The patent divides the detection function from the heating function by introducing a separate sensing coil that is distinct from the working coil. The sensing coil is dedicated solely to detecting cooking vessel presence and type, while the working coil is dedicated to heating. This segmentation allows detection to occur with minimal power consumption since the sensing coil operates independently at low power, resolving the contradiction between accurate measurement and energy efficiency
Solution Approach 2:
The patent introduces a sensing coil as an intermediary element between the user/cooking vessel and the working coil. This sensing coil acts as a mediator that provides detection information without requiring the working coil to operate at high power levels. The sensing coil generates a magnetic field that interacts with the cooking vessel to detect its presence and properties, enabling accurate vessel identification while consuming minimal power, thus resolving the energy consumption issue
2Productivity
If high-frequency power is applied to the working coil to generate eddy current for heating, then the cooking vessel is heated efficiently, but the device cannot quickly identify unsuitable vessels without consuming excessive power
Solution Approach 1:
The patent performs preliminary detection action before initiating full heating operation. The sensing coil continuously or preemptively detects the presence and type of cooking vessel before the working coil is activated at high power. This preliminary action allows the system to quickly identify whether a suitable vessel is present and determine the appropriate heating parameters in advance, eliminating the need to consume excessive power to test for vessel suitability and reducing the time required to prepare for efficient heating
Solution Approach 2:
The patent implements periodic detection using the sensing coil to monitor the cooking vessel status. The sensing coil can periodically check for vessel presence and type at low power intervals, allowing the system to quickly adapt when a vessel is placed or removed. This periodic action enables rapid identification of suitable vessels without requiring continuous high-power operation of the working coil, thus improving both response time and energy efficiency
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 accurate and rapid determination of a cooking vessel's inductive heating properties while consuming less power, eliminating the need for user input to select a heating region and allowing immediate heating operation.
Implementation Method 1
a high-frequency voltage of a predetermined magnitude is applied to a working coil. Accordingly, a magnetic field is generated around the working coil
Implementation Method 2
the controller applies a current to the sensing coil to generate a resonant signal
Implementation Method 3
a high-frequency power of a predetermined magnitude is applied to a working coil such that a magnetic field is generated around the working coil and an eddy current is generated in a cooking vessel made of a metal, such that the cooking vessel itself is heated
Implementation Method 4
an eddy current is generated in a cooking vessel made of a metal
Data Source
AI summary
An induction heating device and a method for sensing a cooking vessel on an induction heating device are provided. The induction heating device may include a controller that converts a resonance waveform generated as current is applied to a sensing coil into a square waveform. The controller may determine whether a cooking vessel placed on the induction heating device has an inductive heating property based on a number of pulses of the converted square waveform.