Induction Heating Vessel Detection via Single Pulse Pre-Test
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Solution Overview
Problem
Induction heating devices have low accuracy in detecting vessels due to reliance on zero-time point detection and high power consumption, especially when input voltage fluctuates or adjacent coils are operated, leading to degraded vessel detection and increased energy usage.
Innovation Solution
A method for pre-testing a single pulse in induction heating devices, where the controller adjusts the duration of the on-state of the pulse based on comparison with predetermined reference ranges for count or on-duty time, improving vessel detection accuracy and reducing power consumption by optimizing energy charging and resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zero time point detection is used to detect vessel presence, then the detection function is implemented, but the detection accuracy degrades when input voltage fluctuates or adjacent coils are operated
Solution Approach 1:
The patent performs preliminary action by conducting pre-testing before actual heating operation to determine the appropriate pulse width. The controller applies a test pulse and measures the voltage fluctuation waveform to calculate a test value, which is then used to determine the pulse width for subsequent heating operations. This preliminary characterization of the coil's electrical properties allows the system to adapt to voltage fluctuations and adjacent coil operations, resolving the contradiction between maintaining detection accuracy and ensuring reliable operation under varying electrical conditions.
2Reliability
If continuous monitoring is performed to improve detection accuracy, then vessel detection reliability improves, but power consumption increases
Solution Approach 1:
The patent implements periodic action by using pulse-width modulated signals with varying pulse widths rather than continuous monitoring. The controller adjusts the pulse width based on pre-test results and operating conditions, applying energy only when needed for detection and heating operations. This periodic pulsed operation maintains detection reliability through controlled electrical pulses while significantly reducing overall power consumption compared to continuous monitoring, as the system remains in a low-power state between pulses.
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
Enhances vessel detection accuracy and reliability while reducing power consumption, preventing energy waste and improving user satisfaction by optimizing pulse duration and energy charging in the induction heating device.
Implementation Method 1
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field that is generated around the coil when a high-frequency power of a predetermined magnitude is applied to the coil to heat the object
Implementation Method 2
eddy current may be generated in the object made of metal based on a magnetic field that is generated around the coil
Implementation Method 3
In the electrical resistive method, heat may be generated based on current flowing through a metal resistance wire or a non-metallic heating element, such as silicon carbide, and may be transmitted to the object through radiation or conduction
Data Source
AI summary
Described is a method for controlling an induction heating device having one or more working coils and a controller configured to perform pre-testing based on a single pulse. The method includes: selecting a working coil to be tested, performing a detection operation to detect a vessel disposed on the working coil and generate a first output pulse; comparing at least one of: a count of the first output pulse to a predetermined reference count range, or an on-duty time of the first output pulse to a predetermined reference time range; and adjusting, by the controller, a duration of an on-state of the single pulse based on (i) a result of the comparison of the count of the first output pulse to the predetermined reference count range or (ii) a result of the comparison of the on-duty time of the first output pulse to the predetermined reference time range.