Inductive Energy Transfer Coil for Conductive Object Recognition
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Solution Overview
Problem
Existing inductive energy transmission apparatuses face safety risks due to the heating of metal objects by induced eddy currents, which can lead to damage or fires, and current detection methods are either inaccurate or complex.
Innovation Solution
A component with an object recognition apparatus using a dual inductance system where the energy transmission coil generates both the transmission and measurement currents, allowing for efficient detection of conductive objects without additional coils, preventing energy transmission when objects are present to avoid heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single primary coil is used for both energy transmission and object detection, then device complexity is reduced, but measurement precision deteriorates due to interference from strong transmission currents
Solution Approach 1:
The patent divides the coil system into two separate coils: a primary coil for energy transmission and a secondary measuring coil for object detection. This segmentation allows each coil to be optimized for its specific function, with the measuring coil operating at low current to avoid interference from transmission currents, thereby resolving the contradiction between device simplicity and measurement accuracy.
Solution Approach 2:
The secondary measuring coil acts as an intermediary element that enables object detection without directly participating in energy transmission. By using this intermediate measuring coil with predetermined low measurement current, the system can detect objects accurately without the strong magnetic field from the primary transmission coil interfering with the measurement process.
2Measurement precision
If multiple separate measuring coils are used to improve detection accuracy, then measurement precision improves, but device complexity increases due to additional power electronics
Solution Approach 1:
The secondary measuring coil serves multiple functions: it detects the presence of objects, determines their position, and provides measurement data for safety control. By making this single measuring coil multi-functional, the patent avoids the need for multiple separate measuring coils and their associated power electronics, thus maintaining measurement precision while limiting device complexity.
3Object-generated harmful factors
If measurement current is kept low to avoid heating objects, then object-generated harmful factors are reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the parameter of current magnitude by using a predetermined measurement current that is significantly lower than the transmission current. This parameter change ensures that the measurement current is insufficient to cause harmful heating of metal objects while still generating a magnetic field strong enough for accurate object detection through the measuring coil.
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 enables precise and efficient detection of conductive objects, preventing heating and ensuring safety by using the same coil for both energy transmission and object recognition, reducing complexity and material usage while maintaining compliance with magnetic field standards.
Implementation Method 1
In the energy transmission coil, a magnetic transmission field is generated in one operating mode by a transmission current
Implementation Method 2
If a metal object, more precisely an electrically conductive object, is located between a coil or inductance of the stationary component and a coil or inductance of the mobile component, this represents a safety risk, since it may become strongly heated by the eddy currents induced by the magnetic field of the energy transmission
Implementation Method 3
The primary inductance is used as a measuring inductance or measuring coil for the detection, and a plurality of separate measuring inductances may also be used. Each measuring coil is acted upon with a measurement current of predetermined strength. An electrically conductive object is detected in that the measuring field of the measuring coil generates eddy currents in the object, whose magnetic retroactive effect on the particular measuring coil brings about a change in the impedance of this measuring coil
Data Source
AI summary
The invention relates to a component of an inductive energy transmission apparatus, wherein the component includes an object recognition apparatus having at least a first and a second electrical inductance, wherein the first electrical inductance is formed by an energy transmission coil of the component, which can be acted upon by a predetermined measurement current, and the component comprises a measurement apparatus, an energy transmission unit and an evaluation apparatus.