Shared Working Coil Control for Wireless Power and Induction Heating
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Solution Overview
Problem
Existing wireless power transmission systems struggle to selectively perform or terminate induction heating or wireless power transmission based on the type of small home appliance, and they require separate detection circuits and coils, which are costly and inefficient in terms of space utilization.
Innovation Solution
A wireless power transmission apparatus with a working coil that can change operation modes, an inverter for outputting current at specific frequencies, and a controller that detects target objects and determines whether they are devices with or without reception coils, allowing for selective operation in wireless power transmission or induction heating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate detection circuit and detection coil are added to detect target objects, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the detection function into the existing working coil by using the working coil to generate detection signals and detect target objects. The controller uses the working coil to apply detection signals at different frequencies and measure impedance changes to identify device types, eliminating the need for separate detection circuits and coils.
Solution Approach 2:
The working coil is designed to serve multiple functions: it acts as both the detection coil for identifying device types and the heating coil for induction heating. The same coil structure and controller are used for both detection and heating operations, reducing overall system complexity.
2Measurement precision
If a separate detection circuit and detection coil are added to detect target objects, then detection accuracy is improved, but space utilization deteriorates
Solution Approach 1:
The detection function is merged into the existing working coil structure, eliminating the need for additional detection coils and circuits that would occupy extra space. The same physical coil serves both detection and heating purposes.
Solution Approach 2:
The working coil performs dual functions as both detection and heating elements, maximizing space utilization by avoiding redundant components.
3Use of energy by moving object
If the working coil operates in wireless power transmission mode, then power transmission efficiency is improved, but induction heating capability deteriorates
Solution Approach 1:
The system dynamically switches between wireless power transmission mode and induction heating mode based on the detected device type. The controller adjusts the operating parameters of the working coil according to the load characteristics, enabling the same coil to efficiently perform different functions.
Solution Approach 2:
The controller changes the operating frequency and power parameters of the working coil based on the detected device type. For devices with reception coils, wireless power transmission parameters are used; for devices without reception coils, induction heating parameters are applied.
4Use of energy by moving object
If the working coil operates in induction heating mode, then heating efficiency is improved, but wireless power transmission capability deteriorates
Solution Approach 1:
The system dynamically switches between induction heating mode and wireless power transmission mode based on the detected device type. The controller adjusts the operating parameters of the working coil according to the load characteristics, enabling the same coil to efficiently perform different functions.
Solution Approach 2:
The controller changes the operating frequency and power parameters of the working coil based on the detected device type. For devices without reception coils, induction heating parameters are used; for devices with reception coils, wireless power transmission parameters are applied.
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 apparatus enables safe and efficient operation by determining the appropriate mode for different types of small home appliances without the need for separate detection circuits, reducing costs and improving space utilization.
Implementation Method 1
a general electron induction heating device allows high-frequency current to flow in a working coil or heating coil installed therein. When the high-frequency current flows in the working coil or the heating coil, a strong line of magnetic force is generated. The line of magnetic force generated in the working coil or the heating coil forms eddy current while being transmitted through a cooking tool.
Implementation Method 2
The line of magnetic force generated in the working coil or the heating coil forms eddy current while being transmitted through a cooking tool. Thus, as eddy current flows in a cooking tool, heat is generated to heat a container itself
Implementation Method 3
when alternating current (AC) flows into a transmission coil, a battery is charged by forming a magnetic field around the transmission coil, allowing AC to flow in a reception coil due to influence of the magnetic field
Data Source
AI summary
A wireless power transmission apparatus for induction heating includes: a working coil that is configured to change operation based on selection of a mode of operation from among a plurality of operating modes, the plurality of operating modes including a wireless power transmission mode configured to wirelessly transmit power and a heating mode configured to heat one or more objects, an inverter that is configured to output, to the working coil, current at an operation frequency, and a controller. The controller is configured to detect a target object, and determine, in the wireless power transmission mode, whether the target object is (i) a device from among a first group of devices including a device with a reception coil or (ii) an induction heating device.