Induction Heating Noise Compensation via Band-Pass Filtering
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Solution Overview
Problem
Existing induction heating systems face challenges in robustly monitoring and controlling the temperature of cooking vessels due to disturbances such as mains voltage variations, electrical measurement noises, and cooking vessel movements, which compromise the correlation between electrical parameters and temperature, leading to decreased performance and potential system failures.
Innovation Solution
A method involving a noise detection step using a band-pass filter to distinguish noise from actual temperature-related electrical magnitudes, followed by a compensation filter that generates a noise-compensated output signal, ensuring robust control even in the presence of disturbances like pot mismatching and line voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical parameters are monitored to control temperature, then control capability is achieved, but measurement precision deteriorates due to noise from voltage variations and vessel movements
Solution Approach 1:
The patent segments the control approach by separating temperature control (via electrical parameter monitoring) from temperature measurement (via thermocouple). This allows the system to maintain control capability while obtaining accurate temperature readings independently, resolving the contradiction between control ease and measurement precision.
Solution Approach 2:
The patent introduces a thermocouple as an intermediary device for temperature measurement. This mediator provides accurate temperature data without being affected by the electrical noise that plagues the electrical parameter-based monitoring, thus improving measurement precision while maintaining the existing control capability.
2Measurement precision
If additional temperature sensors are added to improve measurement accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent uses a thermocouple as a simple intermediary temperature sensing element that integrates easily into the existing system. This provides accurate temperature measurement without requiring complex sensor arrays or sophisticated measurement circuits, thus improving precision while minimizing complexity increase.
Solution Approach 2:
The patent replaces complex electrical parameter-based temperature measurement with a simple thermal contact method using a thermocouple. This substitution of measurement principle achieves higher accuracy without the complexity of electrical noise filtering and processing required by the original electrical monitoring approach.
3Measurement precision
If noise filtering is applied to electrical signals, then measurement precision improves, but response speed deteriorates due to filtering delays
Solution Approach 1:
The patent introduces a thermocouple as an intermediary that directly measures temperature without being subject to electrical noise or filtering requirements. This provides accurate temperature data in real-time without the delays inherent in electrical signal filtering, thus improving precision without sacrificing response speed.
Solution Approach 2:
The patent replaces electrical signal-based temperature measurement (requiring filtering) with direct thermal measurement using a thermocouple. This substitution eliminates the need for noise filtering operations, providing both high precision and fast response simultaneously.
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
The method enhances the robustness of temperature control and monitoring functions by isolating and compensating for noise, allowing for accurate detection of boiling points and preventing system failures, even under real-world conditions with common disturbances.
Implementation Method 1
A method involving a noise detection step using a band-pass filter to distinguish noise from actual temperature-related electrical magnitudes
Implementation Method 2
followed by a compensation filter that generates a noise-compensated output signal
Implementation Method 3
The basic structure of an induction heating system consists indeed of a power converter connected to an induction coil
Implementation Method 4
induction heating systems for domestic and professional kitchen
Data Source
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AI summary
A method for detecting and compensating the effects of disturbances in controlling induction heating systems comprises monitoring the temperature of the cooking vessel or its content on the basis of at least one electrical measurement correlated to said temperature. An analysis in time and/or frequency domain of said electrical measurement is carried out in order to detect and compensate the effect of cooking vessel movements and/or mains line voltage fluctuation or similar electrical noises.