Vehicle Wireless Charging Coil Alignment Under Acceleration
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Solution Overview
Problem
The efficiency of wireless charging for mobile terminals on vehicles decreases due to acceleration-induced movement of the mobile terminal, which shifts the relative position of the power receiving and transmitting coils.
Innovation Solution
A wireless charging device with a control unit that detects horizontal acceleration exceeding a predetermined threshold, estimates the moving direction of the mobile terminal, and adjusts the position of the power transmitting coil to maintain optimal alignment with the power receiving coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging is performed on a vehicle without compensation for vehicle acceleration, then the charging system is simple, but the charging efficiency decreases due to mobile terminal movement
Solution Approach 1:
The control unit continuously monitors acceleration sensor data during wireless charging and uses this feedback to dynamically adjust the power transmitting coil's position. When acceleration exceeds a threshold, the system estimates the mobile terminal's movement direction and repositions the coil accordingly, maintaining optimal alignment between transmitting and receiving coils to preserve charging efficiency.
Solution Approach 2:
The power transmitting coil is designed with movable capability, allowing it to dynamically adjust its position in response to vehicle acceleration. This dynamic adjustment mechanism enables the coil to track and compensate for mobile terminal displacement caused by vehicle motion, ensuring consistent charging performance under varying acceleration conditions.
2Reliability
If the power transmitting coil position is fixed, then the device structure is simple, but the positional alignment with the power receiving coil deteriorates during vehicle acceleration
Solution Approach 1:
The control unit uses acceleration sensor data as feedback to determine when and how to adjust the power transmitting coil's position. By monitoring acceleration magnitude and direction, the system activates the movable coil mechanism only when necessary (when acceleration exceeds threshold), maintaining reliable alignment without requiring continuous complex adjustment mechanisms.
Solution Approach 2:
The system automatically detects acceleration events and self-adjusts the power transmitting coil's position without user intervention. The control unit estimates the mobile terminal's movement based on acceleration data and autonomously repositions the coil to maintain optimal alignment, making the positioning system self-regulating rather than requiring manual or complex external control.
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 solution effectively suppresses the decrease in charging efficiency by quickly correcting the positional relationship between the coils, ensuring consistent and efficient charging even during vehicle acceleration.
Implementation Method 1
a power transmitting coil 100a to be supplied with electric power from the vehicle battery 13
Data Source
AI summary
The wireless charging device is mounted on a vehicle. The wireless charging device includes a control unit. The control unit estimates the moving direction of the mobile terminal on the wireless charging device based on the direction of the acceleration in a case where the occurrence of acceleration having a magnitude equal to or larger than a predetermined threshold in the horizontal direction is detected during charging of the mobile terminal. Further, in the wireless charging device, the control unit determines the position of the power transmitting coil based on the estimated moving direction of the mobile terminal.