Inductive Charging Coil Alignment Using Positioning Field Ratios
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Solution Overview
Problem
Existing methods for detecting the relative position of stationary and mobile induction charging devices in inductive energy transfer systems lack precision and robustness, often requiring calibration and are inefficient due to variations in vertical distance.
Innovation Solution
Generate at least two distinguishable magnetic positioning fields fixed relative to one power coil, which are received by the other power coil, determining the relative position based on the ratio between these fields, eliminating the need for calibration by using predefined ratio ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional position detection methods are used, then the system can detect relative position, but the detection precision is insufficient and requires repeated calibration
Solution Approach 1:
The detection system is segmented into multiple independent detector coil elements arranged in pairs. Each pair detects magnetic field components in different directions, allowing independent measurement of position in different axes. This segmentation enables more precise relative position detection without requiring system-wide recalibration.
Solution Approach 2:
The system changes the measurement parameter from absolute magnetic field strength to the ratio of magnetic field components detected by paired coil elements. This parameter transformation makes the detection independent of vertical distance variations and eliminates the need for repeated calibration while improving precision and robustness.
2Measurement precision
If calibration procedures are implemented to improve detection accuracy, then measurement precision improves, but device complexity and operation time increase
Solution Approach 1:
The detector coil pairs automatically perform self-calibration by comparing magnetic field components in different directions. The ratio calculation method inherently compensates for variations in vertical distance and field strength, eliminating the need for external calibration procedures or complex calibration systems.
3Measurement precision
If multiple detector coil elements are used to improve detection precision, then measurement precision improves, but device complexity increases
Solution Approach 1:
Multiple detector coil elements are merged into paired configurations where each pair handles a specific directional component. The paired structure combines the functionality of multiple sensors while using ratio calculation to simplify the overall detection process, achieving high precision without proportional increases in system complexity.
4Device complexity
If traditional single-field detection is used, then device complexity is low, but detection precision and robustness are insufficient
Solution Approach 1:
The system transitions from single-field strength detection to multi-dimensional field component detection using paired coil elements. By measuring both magnitude and directional components of the magnetic field, the system achieves higher precision in relative position detection while maintaining manageable complexity through ratio-based processing.
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
Ensures precise and robust detection of the relative position of power coils, allowing efficient energy transfer without repeated calibration, even at different heights or depths, and enabling reliable operation across various vehicle types.
Implementation Method 1
one of the power coils generates an alternating magnetic field that induces a voltage in the other power coil for energy transmission
Implementation Method 2
at least two fields are generated in one of the induction charging devices... The positioning fields are received at least one position fixed to the power coil of the other induction charging device
Data Source
AI summary
A method for detecting the relative position of a stationary induction charging device to a mobile induction charging device may include providing, in a first induction charging device, at least two distinguishable positioning fields. The method may further include receiving the at least two positioning fields in a second induction charging device, determining a ratio between the at least two positioning fields, and recognizing that a first power coil of the first induction charging device and a second power coil of the second induction charging device are arranged in a virtual frame volume and overlap transversely to a vertical direction when the determined ratio lies in a predetermined ratio range. The virtual frame volume may be bounded by at least two intensity maximums of the at least two positioning fields and may extend in the vertical direction.