Induction Heating Coil Resonance Switching for WPT Cooking
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Solution Overview
Problem
Induction heat cooking apparatuses face limitations in efficiently heating diverse cooking materials and wirelessly transferring power, as they rely on fixed resonance frequencies and lack adaptive control mechanisms to differentiate between heating and power transfer modes.
Innovation Solution
The induction heat cooking apparatus incorporates a mode conversion switch that couples resonance capacitors with wireless power transfer capacitors in parallel, allowing the system to adjust resonance frequency based on the object's type and operation mode, enabling both efficient heating and wireless power transfer using the same heating coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed resonance frequency is used in the induction heat cooking apparatus, then the circuit design is simple, but the system cannot efficiently heat diverse cooking materials or transfer power wirelessly under varying load conditions
Solution Approach 1:
The patent implements dynamic switching between different capacitive units (first capacitive unit with resonance capacitor for heating mode, second capacitive unit with WPT capacitor for wireless power transfer mode) based on operation mode. The mode conversion switch dynamically reconfigures the resonant circuit parameters, allowing the system to adapt to different cooking materials and power transfer requirements while maintaining efficient resonance in each mode.
Solution Approach 2:
The heating coil is designed to serve dual functions: it acts as both a heating coil for induction heating and a transmitting coil for wireless power transfer. By sharing the same coil structure and using mode-specific capacitive units, the system achieves multi-functionality without requiring separate dedicated components for each operation mode.
2Reliability
If separate heating coil and transmitting coil are used, then heating efficiency and power transfer efficiency are both optimized, but device complexity and cost increase
Solution Approach 1:
The heating coil is designed with multi-functionality to serve as both the heating coil for induction heating and the transmitting coil for wireless power transfer. The same coil structure is used in both modes, reducing component count and complexity while maintaining efficient performance through mode-specific capacitive tuning.
Solution Approach 2:
The system optimizes performance by changing resonant circuit parameters (capacitance values) rather than changing the physical coil structure. Different capacitive units are switched in and out based on operation mode, allowing the same coil to operate efficiently at different frequencies and for different purposes without structural modifications.
3Adaptability or versatility
If the system operates in both heating mode and wireless power transfer mode, then versatility is improved, but control complexity increases
Solution Approach 1:
The mode conversion switch provides dynamic reconfiguration of the resonant circuit based on the detected operation mode. When heating mode is detected, the first capacitive unit is connected; when wireless power transfer mode is detected, the second capacitive unit is connected. This dynamic switching enables versatile operation while keeping control logic relatively simple through clear mode differentiation.
Solution Approach 2:
The control unit detects the operation mode (heating or wireless power transfer) and uses this feedback information to appropriately switch between different capacitive units. This feedback mechanism ensures the resonant circuit is properly configured for the current operation mode, enabling versatile functionality with manageable control complexity.
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 allows for adaptive operation, efficiently heating cooking devices and wirelessly transferring power with high efficiency and stability, regardless of the load's variability, by dynamically adjusting resonance frequencies and switching between heating and power transfer modes.
Implementation Method 1
high frequency current flows through a working coil or a heating coil, which is provided in the induction heat cooling apparatus. 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.
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
a first capacitive unit that includes one or more resonance capacitors and that is coupled between the output nodes; a second capacitive unit that includes one or more wireless power transfer (WPT) capacitors and that is configured to be coupled between the output nodes
Data Source
AI summary
An induction heat cooking apparatus that includes: a rectifier that is configured to convert alternating current (AC) voltage supplied from an external power source into direct current (DC) voltage; an inverter that is configured to generate current based on DC voltage received from the rectifier and provide the current to output nodes; heating coils that are configured to, based on the current generated by the inverter, generate magnetic fields for providing heat; a first capacitive unit that includes one or more resonance capacitors and that is coupled between the output nodes; a second capacitive unit that includes one or more wireless power transfer (WPT) capacitors and that is configured to be coupled between the output nodes; and a mode conversion switch that is configured to couple the second capacitive unit to the first capacitive unit in parallel is disclosed.