Induction heat cooking apparatus to implement WPT and PFC power converter
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Solution Overview
Problem
Induction heat cooking apparatuses face limitations in efficiently heating diverse cooking vessels and transferring wireless power, as they require specific resonance frequencies and capacitive configurations, which can be inflexible and inefficient when switching between heating and wireless power transfer modes.
Innovation Solution
The induction heat cooking apparatus incorporates a mode conversion switch that couples and decouples capacitive units to adjust resonance frequency based on the object's type and operation mode, using a combination of resonance capacitors and wireless power transfer capacitors to generate magnetic fields for heating or power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed capacitive configuration is used in induction heat cooking apparatus, then the circuit operates at a specific resonance frequency, but it cannot efficiently switch between heating mode and wireless power transfer mode which require different resonance frequencies
Solution Approach 1:
The patent applies the dynamics principle by making the capacitive configuration adjustable rather than fixed. A mode conversion switch dynamically reconfigures the connection of capacitors between series and parallel arrangements, allowing the resonance frequency to be adjusted according to the operating mode (heating or wireless power transfer). This dynamic reconfiguration enables the system to adapt to different frequency requirements without requiring multiple fixed circuits.
Solution Approach 2:
The patent implements universality by designing a single induction heat cooking apparatus that can perform multiple functions: both traditional induction heating and wireless power transfer. By incorporating a mode conversion switch that can reconfigure the capacitive network, the same hardware platform supports both heating mode (requiring one resonance frequency) and wireless power transfer mode (requiring a different resonance frequency), eliminating the need for separate dedicated circuits for each function.
2Reliability
If separate circuits are designed for heating mode and wireless power transfer mode, then each mode can operate at its optimal resonance frequency, but the device complexity and component count increase
Solution Approach 1:
The patent applies the merging principle by combining the heating circuit and wireless power transfer circuit into a single unified circuit structure. Instead of having completely separate circuits for each mode, the patent uses a shared circuit with a mode conversion switch that reconfigures the same components (capacitors, inductors, switching elements) to serve both functions. This merging reduces component count and device complexity while maintaining the ability to operate at optimal frequencies for each mode through dynamic reconfiguration.
3Use of energy by moving object
If the resonance frequency is fixed for heating operation, then the heating efficiency is optimized, but the apparatus cannot efficiently transfer wireless power which requires a different resonance frequency
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the resonance frequency parameter based on the operating mode. Through the mode conversion switch, the capacitive configuration is changed (series or parallel connection), which directly alters the resonance frequency of the circuit. This parameter adjustment enables the system to maintain high energy efficiency in both heating mode (at heating-optimized frequency) and wireless power transfer mode (at WPT-optimized frequency), rather than being constrained to a single fixed frequency.
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 efficient heating of cooking vessels and wireless power transfer by dynamically adjusting resonance frequencies, enhancing energy efficiency and adaptability across different operation modes.
Implementation Method 1
a rectifier that is configured to convert alternating current (AC) voltage supplied from an external power source into direct current (DC) voltage
Implementation Method 2
an inverter that is configured to generate current based on DC voltage received from the rectifier and provide the current to output nodes
Implementation Method 3
heating coils that are configured to, based on the current generated by the inverter, generate magnetic fields for providing heat
Implementation Method 4
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 5
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
Implementation Method 6
a mode conversion switch that is configured to couple the second capacitive unit to the first capacitive unit in parallel
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.