Wireless Charging Electromagnetic Field Control via Sensor Feedback
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Solution Overview
Problem
Wireless charging systems for electric and hybrid electric vehicles generate unwanted electromagnetic fields that can adversely affect humans and nearby devices, requiring a solution to control and minimize these fields while maintaining effective charging efficiency.
Innovation Solution
An electromagnetic field controlling system that includes a magnetic field sensor to detect the magnitude of electromagnetic fields and an output controller to adjust power transmission based on predetermined safety levels, using PID control and seating sensors to optimize power distribution and ensure safe exposure limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging power is increased to reduce charging time, then charging efficiency is improved, but electromagnetic field exposure increases and may adversely affect humans and devices
Solution Approach 1:
The system continuously monitors electromagnetic field magnitude using magnetic field sensors and feeds this information back to the output controller. The controller dynamically adjusts the wireless charging power transmission level based on the detected electromagnetic field magnitude, ensuring charging efficiency is maximized while electromagnetic field exposure remains within safe limits defined by guidelines.
Solution Approach 2:
The system changes the operating parameters of the wireless charging system by adjusting the output power transmission level based on detected electromagnetic field conditions. When electromagnetic field magnitude approaches safety thresholds, the system automatically reduces power transmission parameters to maintain safe exposure levels while still providing effective charging.
2Object-affected harmful factors
If electromagnetic field magnitude is reduced to ensure safety, then harmful effects are minimized, but charging efficiency decreases
Solution Approach 1:
The system dynamically adjusts the wireless charging power transmission level in real-time based on detected electromagnetic field magnitude. Rather than operating at a fixed low power level, the system optimizes power transmission within safe electromagnetic field limits, increasing power when conditions permit and reducing it when safety thresholds are approached, thereby maximizing charging efficiency while ensuring safety.
3Measurement precision
If multiple magnetic field sensors are installed to improve detection accuracy, then electromagnetic field monitoring precision is improved, but device complexity increases
Solution Approach 1:
The system divides the monitoring space into multiple detection zones by strategically placing magnetic field sensors in different locations around the wireless charging system. Each sensor monitors electromagnetic field magnitude in its specific zone, and the output controller integrates information from all sensors to determine the overall electromagnetic field exposure level, achieving comprehensive monitoring without requiring excessive sensors.
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
The system effectively minimizes adverse electromagnetic field exposure to humans and devices while maximizing charging efficiency by adjusting power transmission to stay within safe limits, ensuring safe and efficient battery charging operations.
Implementation Method 1
Wireless charging technology is based on transmitting and receiving electric power using electromagnetic induction or resonance
Implementation Method 2
the magnetic field sensor may be implemented as a hall effect sensor
Data Source
AI summary
An electromagnetic field controlling system and method are provided. The electromagnetic field controlling system includes a magnetic field sensor that is disposed proximate to or in a vehicle that charges electric power using a wireless charging system and is configured to detect the magnitude of an electromagnetic field. An output controller adjusts output power in a power transmission side of the wireless charging system based on a comparison between a predetermined value for an electromagnetic field and the magnitude of the electromagnetic field detected by the magnetic field sensor. Accordingly, the magnitude of an electromagnetic field output from a vehicle wireless charging system is controlled within a safe range.