Induction Heating Coil Resonance Switching for WPT Mode Sharing
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Solution Overview
Problem
Induction heat cooking apparatuses face limitations in efficiently switching between cooking device heating and wireless power transfer modes, with existing systems often requiring separate coils and frequency adjustments, which can lead to inefficiencies and compatibility issues with variable loads.
Innovation Solution
The induction heat cooking apparatus incorporates a WPT capacitor connected in parallel to the resonance capacitor, controlled by mode conversion switches, allowing the same heating coil to operate in both cooking device heating and wireless power transfer modes, with a PFC power converter ensuring stable output to variable loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate coils are used for heating and wireless power transfer, then the reliability of each function is improved, but the device complexity increases
Solution Approach 1:
The patent implements a universal heating coil that can operate in both induction heating mode and wireless power transfer mode by changing the capacitance configuration. The same coil structure serves dual purposes, eliminating the need for separate coils while maintaining functional reliability through mode-specific capacitance tuning.
Solution Approach 2:
The patent merges the heating function and wireless power transfer function into a single integrated system using one coil. By combining these functions and using a mode conversion switch to adjust capacitance, the system achieves both heating and WPT capabilities without requiring separate hardware components.
2Adaptability or versatility
If frequency adjustments are made for wireless power transfer mode, then the adaptability to different loads is improved, but the loss of time for mode switching increases
Solution Approach 1:
The patent changes the capacitance parameter of the resonant circuit to switch between heating mode and wireless power transfer mode. By using a mode conversion switch that reconfigures the capacitance connection (parallel or series), the system achieves frequency adjustment for different modes without complex frequency sweeping, reducing mode switching time while maintaining adaptability to different loads.
3Device complexity
If the same heating coil is used for both heating and wireless power transfer, then the device complexity is reduced, but the reliability of mode switching deteriorates
Solution Approach 1:
The patent introduces a mode conversion switch as an intermediary component that reliably controls the connection configuration of the capacitance. This switch acts as a mediator between the single coil and the two operating modes, ensuring reliable mode switching by providing clear on/off states for capacitance connection, thereby maintaining functional reliability while using a unified coil structure.
4Adaptability or versatility
If capacitance is adjusted for wireless power transfer mode, then the adaptability to variable loads is improved, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic capacitance configuration system where the capacitance value can be changed based on the operating mode. The mode conversion switch dynamically reconfigures the capacitance connection (parallel for heating mode, series for WPT mode), allowing the system to adapt to variable loads in wireless power transfer mode while maintaining simple structure through a single switching mechanism.
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
This solution enables efficient switching between heating and wireless power transfer modes, improving energy efficiency and compatibility with variable loads, while maintaining high power factor and efficiency across both operations.
Implementation Method 1
When the high frequency current flows through the working coil or the heating coil, lines of strong magnetic force are generated. The lines of the magnetic force generated in the working coil or the heating coil generate eddy current when passing through a cooking device. Thus, since the eddy current flows through the cooking device, heat is generated to heat a container itself.
Implementation Method 2
The lines of the magnetic force generated in the working coil or the heating coil generate eddy current when passing through a cooking device. Thus, since the eddy current flows through the cooking device, heat is generated to heat a container itself.
Implementation Method 3
since the eddy current flows through the cooking device, heat is generated to heat a container itself
Implementation Method 4
a WPT capacitor, which is not connected to a resonance capacitor or is connected in parallel to the resonance capacitor as the induction heat cooking apparatus operates in a cooking device heating mode or a wireless power transfer mode
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
Provided is an induction heat cooking apparatus. The induction heat cooking apparatus includes a rectifier configured to convert an AC voltage supplied from an external power source into a DC voltage, an inverter configured to receive the voltage from the rectifier to supply current to heating coils, the heating coils configured to generate magnetic fields when the current flows through the inverter, a resonance capacitor including both DC terminals through which the voltage is outputted from rectifier and a plurality of capacitors connected in series to each other between the heating coils, a wireless power transfer (WPT) capacitor connected in parallel to the resonance capacitor, and a mode conversion switch configured to determine whether to connect the resonance capacitor to the WPT capacitor in parallel.