Transmitting Coil Characteristic Detection Using Opposing Measurement Coils
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Solution Overview
Problem
The efficiency of inductive charging systems is affected by the placement and orientation of the transmitting coil relative to the receiving coil, which current technologies fail to accurately determine and optimize.
Innovation Solution
A system utilizing two measurement coils wound in opposite directions, with a processor to measure voltages at specific frequencies and determine characteristics such as the direction and angle of the transmitting coil, based on voltage ratios, to optimize energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the transmitting coil placement and orientation are not accurately determined, then the system complexity remains low, but the energy transfer efficiency deteriorates
Solution Approach 1:
The patent introduces measurement coils as intermediary elements that indirectly detect the transmitting coil's characteristics. Instead of directly measuring the transmitting coil's position and orientation, the system uses measurement coils placed in known positions to sense the magnetic field, which then provides information about the transmitting coil's state. This intermediary approach enables efficient energy transfer optimization without requiring complex direct measurement systems.
Solution Approach 2:
The patent replaces complex mechanical positioning and orientation measurement systems with electromagnetic field-based detection. By using measurement coils to detect magnetic field characteristics (voltage ratios, phase differences), the system determines transmitting coil orientation and position without mechanical sensors or complex actuation mechanisms, thereby maintaining low system complexity while improving energy transfer efficiency.
2Measurement precision
If voltage measurements are taken at multiple frequencies, then the measurement precision improves, but the measurement time increases
Solution Approach 1:
The patent applies partial action by selecting specific predetermined frequencies for measurement rather than continuously measuring across all possible frequencies. The system identifies characteristic frequencies where the measurement coils exhibit maximum sensitivity to the transmitting coil's orientation and position, performing measurements only at these critical frequencies. This approach achieves sufficient measurement precision for determining coil characteristics without the time penalty of exhaustive multi-frequency scanning.
Solution Approach 2:
The patent changes the frequency parameter to specific predetermined values that optimize the measurement process. By tuning the measurement frequency to match resonant frequencies or characteristic frequencies of the measurement coils, the system maximizes the voltage response and measurement sensitivity. This frequency parameter optimization enables accurate characteristic determination with minimal measurement time, as measurements are taken at frequencies where the signal-to-noise ratio is maximized.
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 precise determination of the transmitting coil's characteristics, enhancing the efficiency of energy transfer and improving charging performance in inductive charging systems.
Implementation Method 1
Inductive charging is a form of wireless power transfer that utilizes electromagnetic induction to provide electricity from a transmitting coil to an electronic device that has a receiving coil. Inductive charging occurs when an alternating current passes through a transmitting coil and creates a magnetic field. The magnetic field emitted from the transmitting coil fluctuates in strength as the alternating current is continually changing velocity. This magnetic field emitted from the transmitting coil causes an alternating electrical current in a receiving coil.
Implementation Method 2
The voltage measuring device may be configured to measure a first voltage of the first measurement coil and a second voltage of the second measurement coil in response to the magnetic field generated by the transmitting coil.
Data Source
AI summary
A system for determining at least one characteristic of a transmitting coil generating a magnetic field may include a first measurement coil being wound in a first direction, a second measurement coil being wound in a second direction, a voltage measuring device, and at least one processor in communication with the voltage measuring device. The first measurement coil and the second measurement coil may be adjacent to one another. The voltage measuring device may be configured to measure a first voltage of the first measurement coil and a second voltage of the second measurement coil in response to the magnetic field generated by the transmitting coil. The at least one processor may be configured to determine the at least one characteristic of the transmitting coil based on a ratio between the first voltage and the second voltage at a predetermined frequency.