Inductive Charging Station Ferritic Object Detection
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Solution Overview
Problem
Existing inductive charging systems for electric vehicles face challenges in detecting ferritic objects between the primary and secondary coils, which can cause damage or fires due to heating and power dissipation, and current methods are costly and inefficient.
Innovation Solution
A measuring device is used to evaluate the voltage amplitude of the resonant circuit by interrupting and short-circuiting the excitation, allowing for reliable detection of ferritic objects by analyzing the decaying oscillation's time function and damping rate, with reference values stored for comparison to enable or disable charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inductive charging is performed with high currents and frequencies, then charging efficiency is improved, but the risk of heating ferritic objects and causing damage or fires increases
Solution Approach 1:
The system performs a preliminary detection phase before charging by interrupting the excitation of the primary resonant circuit and measuring the damping rate of the resulting oscillation. This preliminary measurement of the time function of voltage amplitude allows the system to identify ferritic objects in advance, preventing harmful heating during the actual charging process.
Solution Approach 2:
The system continuously monitors the damping rate of the resonant circuit oscillation during charging and compares it against reference values. When ferritic objects are detected through changes in damping characteristics, the system provides feedback to adjust or terminate the charging process, preventing overheating and damage.
2Reliability
If existing detection methods for ferritic objects are used, then safety is improved, but device complexity and cost increase
Solution Approach 1:
The measuring device utilizes the existing primary resonant circuit components (capacitor and coil) for dual purposes: both for energy transfer during charging and for detecting ferritic objects. By measuring the damping rate of the resonant circuit itself, the system eliminates the need for separate detection sensors, reducing device complexity while maintaining detection reliability.
Solution Approach 2:
The primary resonant circuit serves itself by providing its own oscillation characteristics as the measurement basis for detecting ferritic objects. The system measures the time function of the voltage amplitude of the primary resonant circuit after interrupting excitation, using the circuit's inherent behavior rather than requiring external detection mechanisms.
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 approach allows for reliable and cost-effective detection of ferritic objects, preventing damage and ensuring safe inductive charging by evaluating the voltage amplitude and damping rate, thereby minimizing expenses and risks.
Implementation Method 1
a primary resonant circuit with a primary capacitor and a primary coil for generating an electrical oscillation
Implementation Method 2
the strong alternating magnetic field will produce either iron losses in ferritic materials or eddy currents in conductive objects
Implementation Method 3
may heat them significantly on account of the intense power dissipation
Implementation Method 4
a primary resonant circuit with a primary capacitor and a primary coil for generating an electrical oscillation
Implementation Method 5
evaluate the time function of the voltage amplitude of the primary resonant circuit after the interruption of the excitation
Data Source
AI summary
A charging station for the inductive charging of a battery of a motor vehicle. A primary resonant circuit for generating an electrical oscillation, the primary resonant circuit has a primary capacitor and a primary coil. The charging station includes a measuring device designed to excite the primary resonant circuit up to a predefinable voltage amplitude, then to interrupt the excitation of the primary resonant circuit and to evaluate the time function of the voltage amplitude of the primary resonant circuit after the interruption of the excitation of the primary resonant circuit.