Induction Coil Timing Control for Vessel Eccentricity Detection
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Solution Overview
Problem
Existing induction heating devices with multiple working coils face issues in determining vessel eccentricity, leading to impossible eccentricity determination and unstable power supply when overlapping eccentricity determination periods occur, particularly when one coil is duty-driven.
Innovation Solution
A method to control the induction heating device by setting distinct driving start times and eccentricity determination periods for each working coil based on their driving schemes and duty cycles, ensuring non-overlapping times for accurate eccentricity determination and stable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If eccentricity determination periods are set for multiple working coils, then vessel eccentricity can be detected, but overlapping determination periods cause impossible eccentricity determination
Solution Approach 1:
The patent applies periodic action by setting distinct, non-overlapping eccentricity determination periods for each working coil. The control circuit is configured to determine eccentricity of a vessel on a first working coil during a first determination period, and determine eccentricity of a vessel on a second working coil during a second determination period that does not overlap with the first period. This periodic, staggered approach allows accurate eccentricity measurement for each coil without interference from simultaneous determination operations on multiple coils.
2Productivity
If working coils are driven simultaneously, then heating efficiency is improved, but current imbalance occurs when vessels are in eccentricity
Solution Approach 1:
The patent implements feedback control by continuously monitoring the current supplied to each working coil and comparing it with reference values to detect vessel eccentricity. When eccentricity is detected during a determination period, the system adjusts the driving current for that specific coil to compensate for the imbalance. This feedback mechanism allows simultaneous operation of multiple coils for efficient heating while maintaining power supply stability through real-time current regulation based on detected eccentricity conditions.
3Power
If more current is supplied to compensate for eccentricity, then power delivery to vessel is maintained, but internal circuitry may be damaged
Solution Approach 1:
The patent applies segmentation by dividing the multiple working coils into separate control groups with independent determination and driving periods. When a vessel is detected to be in eccentricity on one coil, only that specific coil's determination period is adjusted or suspended, while other coils continue normal operation. This segmented approach prevents the need to increase current on the eccentric coil by isolating the problem to a single coil, thereby maintaining power delivery to properly positioned vessels without exposing circuitry to damaging current levels.
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
Prevents impossible eccentricity determination and maintains stable power supply by coordinating the driving and eccentricity determination periods of multiple working coils, thereby ensuring consistent heating performance.
Implementation Method 1
When electrical energy is supplied to the working coils, magnetic fields are produced around the working coils. The magnetic fields allow eddy currents to flow through the vessels on the working coils, thereby heating the vessels.
Implementation Method 2
The magnetic fields allow eddy currents to flow through the vessels on the working coils, thereby heating the vessels.
Implementation Method 3
An induction heating device is a device including one or more working coils to heat food vessels via induction heating.
Data Source
AI summary
The disclosure relates to an induction heating device and a method of controlling the induction heating device. The induction heating device includes a first working coil and a second working coil. According to an embodiment of the disclosure, a driving start time of the first working coil and a driving start time of the second working coil are determined based on a driving scheme of the first working coil, a driving scheme of the second working coil, and a predetermined driving period. According to an embodiment of the disclosure, an eccentricity determination period of the first working coil and an eccentricity determination period of the second working coil are determined based on the driving scheme of the first working coil, the driving scheme of the second working coil, the driving period, a duty cycle of the first working coil, and a duty cycle of the second working coil.