Resonant Coil Selection for Wireless Power Object Detection
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Solution Overview
Problem
Existing energy supply devices face challenges in accurately detecting and distinguishing between objects to be energized and foreign substances using induction heating or wireless power transmission, particularly in the presence of metal objects.
Innovation Solution
An energy supply device employing a plurality of coils, a resonant condenser, and an inverter circuit, controlled by a processor to selectively determine transmission and reception coils, transmitting detection signals, and analyzing induced signals to detect and differentiate between objects and foreign substances based on induction signal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If induction heating or wireless power transmission is used to supply energy without contact, then energy supply efficiency is improved, but the ability to accurately detect and distinguish between objects to be energized and foreign substances deteriorates
Solution Approach 1:
The system segments the coil array into multiple independently controllable coils, allowing selective activation of transmission coils and reception coils. This segmentation enables the detection system to distinguish between objects to be energized and foreign substances by analyzing induction signals from specific coil pairs, thereby improving measurement precision without sacrificing energy supply efficiency.
Solution Approach 2:
The patent introduces reception coils as intermediary elements between the transmission coils and the objects/foreign substances. These reception coils detect induction signals generated by detection signals, providing an indirect measurement mechanism that enhances the ability to distinguish between different types of objects while maintaining the efficiency of direct energy transmission through separate transmission coils.
2Productivity
If a plurality of coils are used for energy supply, then energy supply capability is improved, but device complexity increases
Solution Approach 1:
Each coil in the array is designed to serve multiple functions: it can act as a transmission coil for energy supply, a reception coil for detection, or both simultaneously depending on the operational mode. This multi-functionality reduces the need for separate dedicated components, thereby managing device complexity while enhancing energy supply capability through the use of multiple coils.
Solution Approach 2:
The system dynamically configures the roles of individual coils based on real-time operational requirements. The controller selectively determines which coils function as transmission coils and which function as reception coils, allowing the system to adapt its complexity to the specific energy supply task at hand, thus optimizing the balance between capability and complexity.
3Measurement precision
If detection signals are transmitted through transmission coils to detect objects, then detection accuracy is improved, but energy loss increases
Solution Approach 1:
The system applies partial action by transmitting detection signals through only selected transmission coils rather than all coils simultaneously. The controller identifies and activates only those coils necessary for the current detection task, reducing overall energy consumption while maintaining sufficient detection accuracy through targeted signal transmission and reception.
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
Enables precise detection and differentiation of objects to be energized from foreign substances, optimizing energy supply operations and ensuring safe and efficient energy transfer.
Implementation Method 1
controlling an induction signal induced in the second coil by the detection signal to be obtained through a reception circuit connected to the second coil
Data Source
AI summary
An energy supply device that supplies energy to an object. In an embodiment, the energy supply device may include at least one processor, and a plurality of coils connected to a resonant condenser for energy supply and an inverter circuit. In an embodiment, the at least one processor may determine a first coil from among a plurality of coils as a transmission coil and determine a second coil from among the plurality of coils as a reception coil. Further, the at least one processor may transmit a detection signal to the first coil, obtain an induction signal induced in the second coil through a reception circuit connected to the second coil, and detect the object on the energy supply device based on the obtained induction signal.