Inductive Power Supply Metal Detection via Feedback Amplitude
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Solution Overview
Problem
Inductive power transmission systems face challenges in simultaneously processing power transmission and metal detection, as high-power electromagnetic energy can interfere with wireless signal transmission and existing detection methods are prone to errors due to variations in power consumption and hardware changes, making it difficult to accurately detect intruding metals.
Innovation Solution
An inductive power supply system that includes an input power module, storage module, processing module, driving module, inductive coil, and feedback module, which generates a control signal based on initial and adjusted look-up tables to determine the presence of intruding metals by analyzing sinusoidal amplitude changes during power transmission, allowing for safe operation by adjusting power transmission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power electromagnetic energy is used for inductive power transmission, then power transmission efficiency is improved, but intruding metals are heated dangerously
Solution Approach 1:
The system performs metal detection before initiating high-power electromagnetic transmission by analyzing the initial state of the inductive coil. This preliminary detection prevents dangerous heating by identifying intruding metals before they are exposed to high-power energy
Solution Approach 2:
The system continuously monitors changes in the inductive coil's characteristics during power transmission and uses this feedback to detect intruding metals. When changes exceed predetermined thresholds, the system adjusts or stops power transmission to prevent harmful heating
2Difficulty of detecting and measuring
If power consumption analysis is used for metal detection, then detection capability is improved, but detection accuracy deteriorates due to power consumption variations
Solution Approach 1:
The system extracts specific characteristic parameters (inductance, resistance, quality factor) from the inductive coil that are directly affected by metal presence, rather than relying on overall power consumption analysis. This extraction of key parameters improves detection accuracy by focusing on metal-specific effects
Solution Approach 2:
The system monitors changes in electrical parameters (inductance, resistance, quality factor) of the inductive coil when metals are introduced. By detecting parameter changes rather than absolute values, the system achieves accurate metal detection despite variations in power consumption
3Adaptability or versatility
If additional wireless transmission modules are installed for signal transmission, then communication capability is improved, but production cost increases
Solution Approach 1:
The inductive coil serves dual functions: transmitting electromagnetic energy for power transfer and detecting metal objects through monitoring its electrical characteristics. This multi-functionality eliminates the need for separate wireless transmission modules, reducing production costs while maintaining communication capability
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
Effectively detects intruding metals by comparing sinusoidal amplitude differences, preventing dangerous heating and reducing the need for additional wireless transmission modules, thus enhancing safety and efficiency in inductive power transmission systems.
Implementation Method 1
an inductive coil coupled to the driving module for electrically transmitting the driving voltage to a receipt power device
Implementation Method 2
a feedback module coupled to the inductive coil for generating the feedback signal according to the driving voltage received by the inductive coil
Data Source
AI summary
The inductive power supply system comprises an input power module for receiving a stable voltage source, a storage module for storing a predetermined information, a processing module for generating a control signal according to the predetermined information and a feedback signal, a driving module for transforming the stable voltage source into a driving voltage according to the control signal, an inductive coil for electrically transmitting the driving voltage to process an inductive power transmission operation, and a feedback module for generating the feedback signal according to the driving voltage received by the inductive coil, where the predetermined information represents an initial state of the inductive power supply system comprising a sinusoidal amplitude corresponding to the driving voltage, and an intruding metal can affect another sinusoidal amplitude of the feedback signal to make the processing module correspondingly generate the control signal during the inductive power transmission operation.