Wireless EV Charging Coil Control for Human Proximity Safety
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Solution Overview
Problem
Existing electric vehicle charging systems require protocol-specific development due to varying standards across countries and companies, and there's a need to minimize human exposure to magnetic fields during wireless charging.
Innovation Solution
A vehicle wireless charging device with a human body and mobile terminal detection system that adjusts magnetic flux density based on detected distances, using a control unit to manage charging power and communication with EVSE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging power is increased to improve charging efficiency, then charging speed is improved, but human exposure to magnetic fields increases causing safety concerns
Solution Approach 1:
The patent implements dynamic adjustment of charging power based on real-time detection of human proximity. The control unit continuously monitors distance to human bodies and mobile terminals, and dynamically modifies the magnetic flux density of the charging coil accordingly. This allows the system to operate at high power when safe and reduce power when humans are nearby, resolving the contradiction between charging speed and safety
Solution Approach 2:
The system employs detection sensors that provide feedback about human proximity to the control unit. Based on this feedback, the control unit adjusts the charging power level. This closed-loop control mechanism enables the system to automatically balance charging efficiency with safety by responding to real-time environmental conditions
2Object-affected harmful factors
If charging power is reduced to minimize magnetic field exposure, then safety is improved, but charging efficiency decreases
Solution Approach 1:
The system dynamically adjusts power levels rather than operating at a fixed reduced level. When no humans are detected in the vicinity, the system operates at full charging power for maximum efficiency. When humans are detected within the safety radius, power is reduced to safe levels. This dynamic approach eliminates the need to permanently sacrifice charging speed for safety
Solution Approach 2:
The control unit changes the magnetic flux density parameter based on detected human proximity. By adjusting this physical parameter in real-time, the system can optimize both safety and charging efficiency at different operating conditions, rather than being constrained to a single power level
3Object-affected harmful factors
If detection sensors and control systems are added to detect human proximity and adjust power, then safety is improved, but device complexity increases
Solution Approach 1:
The system performs self-monitoring and self-adjustment through integrated detection sensors and control logic. The detection unit automatically identifies human proximity, and the control unit autonomously adjusts charging power without requiring external intervention or complex manual control systems. This self-service approach enhances safety while keeping the control architecture relatively simple
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
Minimizes human exposure to magnetic fields and prevents malfunctions from mobile devices by dynamically adjusting charging power based on proximity, ensuring safe and efficient wireless charging.
Implementation Method 1
a wireless charging unit (11) comprising a first coil (15) to charge a battery of the vehicle (10)
Implementation Method 2
a human body detection sensor (12) to detect a human body near the vehicle (10)
Implementation Method 3
the control unit (13) may reduce the magnetic flux density of the EVSE's second coil (204) via the communication unit (14) as the distance to the human body decreases
Data Source
Figure 1~2
Figure 3~4(b)
AI summary
A vehicle wireless charging device, according to one embodiment of the present invention, comprises: a wireless charging unit comprising a first coil in order to charge a battery of a vehicle; a human body detection sensor for detecting a human body near the vehicle; a control unit for controlling the operation of the wireless charging unit on the basis of information related to the distance to the human body, detected by the detection sensor, and a communication unit for communicating with electric vehicle supply equipment(EVSE), wherein the control unit checks the calibration of the first coil of the wireless charging unit and a second coil of a charging pad, and then receives the information related to the distance to the human body, detected by the human body detection sensor.