Induction Heating Coil Frequency Control for Noise Elimination
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Solution Overview
Problem
Conventional induction cooking devices that simultaneously heat multiple foodstuff containers generate undesirable noise due to frequency differences between induction coils, leading to user discomfort and potential misinterpretation of device malfunctions, resulting in unnecessary maintenance costs and time.
Innovation Solution
A heating device with multiple induction coils and a controlling unit that adjusts power frequencies between coils, ensuring frequency differences fall outside the human hearing range during specific intervals to eliminate noise while allowing for precise control of heating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple induction coils are used to heat multiple foodstuff containers simultaneously, then heating capacity and productivity are improved, but frequency difference between coils generates noise within human hearing range causing user discomfort
Solution Approach 1:
The patent changes the operating frequency parameter of the induction coils. Specifically, it sets the frequency difference between multiple induction coils to be either greater than 15 kHz or smaller than 1 kHz, which are thresholds outside the human hearing range. This parameter adjustment eliminates the noise issue while maintaining the ability to heat multiple containers simultaneously, thus resolving the contradiction between productivity improvement and noise generation.
2Object-affected harmful factors
If frequency difference between induction coils is adjusted to eliminate noise, then user comfort is improved, but control complexity and device complexity increase
Solution Approach 1:
The patent incorporates a controlling unit that monitors and adjusts the operating frequencies of multiple induction coils to maintain the frequency difference within the specified ranges (>15 kHz or <1 kHz). This feedback mechanism automatically ensures noise elimination without requiring manual intervention, thus managing the control complexity through automated frequency regulation.
Solution Approach 2:
The patent implements dynamic frequency adjustment capability, allowing the induction coils to change their operating frequencies based on the cooking state and requirements. The controlling unit dynamically modifies frequency parameters to maintain optimal frequency differences, enabling the system to adaptively eliminate noise while maintaining heating effectiveness.
3Object-affected harmful factors
If frequency difference is constrained to specific ranges, then noise is eliminated, but heating temperature control flexibility is reduced
Solution Approach 1:
The patent employs periodic switching between different induction coils, where each coil operates at its optimal frequency within the noise-free range. By alternately activating coils and adjusting their duty cycles, the system can maintain precise temperature control while ensuring that whenever multiple coils operate simultaneously, their frequency difference remains outside the human hearing range.
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 solution effectively eliminates noise and allows for adjustable heat quality and temperature control, reducing maintenance costs and improving user experience by ensuring accurate heating operations without noise interference.
Implementation Method 1
When a current flows through the induction coil of the induction cooking stove, electromagnetic induction is performed to produce eddy current, thereby heating a foodstuff container
Implementation Method 2
electromagnetic induction is performed to produce eddy current, thereby heating a foodstuff container
Data Source
AI summary
A heating device includes a first induction coil, a second induction coil, a control panel, a power supply unit and a controlling unit. The control panel issues an adjusting signal. The power supply unit provides a first power and a second power to the first induction coil and the second induction coil, respectively. The controlling unit generates a control signal to the power supply unit according to the adjusting signal, thereby controlling the first power and the second power. Electrical energy is transmitted to the first induction coil and the second induction coil and the frequency difference between the first power and the second power is greater than 15 kHz or smaller than 1 kHz during a first time interval under control of the controlling unit. No electrical energy is transmitted to one of the first induction coil and the second induction coil during a second time interval under control of the controlling unit.