Wireless EV Charging Pad Inspection Device for Residual Field Validation
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Solution Overview
Problem
Wireless power transfer for electric vehicles faces challenges such as excessive residual magnetic fields, improper installation leading to wasted power and potential fires, and the need for safe and efficient operation of charging stations.
Innovation Solution
A transmit pad inspection device with a magnetic coupling device, controllable load bank, and bidirectional communication capabilities to ensure proper installation, measure residual magnetic fields, and determine power transfer efficiency, using an inductive circuit to couple with the charging device's primary circuit and a rectification circuit to calculate output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transfer charging devices are installed, then electric vehicles can be charged without physical contact, but excessive residual magnetic field is generated which is hazardous to people and pets
Solution Approach 1:
The inspection device performs measurements and validation before the charging station is put into service. It checks magnetic field levels, power transfer efficiency, and installation correctness in advance, allowing corrections to be made before hazardous conditions affect users.
Solution Approach 2:
The inspection device provides feedback on magnetic field levels and installation correctness. This feedback mechanism allows operators to adjust the charging device configuration or positioning to reduce excessive magnetic fields while maintaining wireless charging functionality.
2Loss of time
If charging stations are improperly installed, then installation time may be reduced, but unacceptably high level of wasted power occurs during charging
Solution Approach 1:
The inspection device performs preliminary validation of installation correctness by checking power transfer efficiency and coupling conditions. This early detection prevents improper installations from entering service, ensuring energy efficiency is verified before operational use begins.
3Device complexity
If charging stations are improperly installed, then installation complexity may be reduced, but excessive unwanted heating of materials occurs which can cause fire
Solution Approach 1:
The inspection device performs preliminary thermal and safety validation before the charging station becomes operational. It detects improper installations that could lead to overheating, allowing corrections to be made in advance and preventing fire hazards during normal operation.
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 safe and efficient wireless power transfer by validating proper installation, measuring residual magnetic fields, and optimizing power transfer efficiency, preventing overheating and fires, while adhering to safety standards.
Implementation Method 1
an inductive circuit that is configured to magnetically couple to a primary circuit of a charging device in a transmit pad as a secondary circuit through an alternating current (AC) magnetic field
Implementation Method 2
The magnetic coupling device further includes a rectification circuit
Data Source
AI summary
A transmit pad inspection device includes a magnetic coupling device, which includes an inductive circuit that is configured to magnetically couple to a primary circuit of a charging device in a transmit pad through an alternating current (AC) magnetic field. The inductive circuit functions as a secondary circuit for a set of magnetically coupled coils. The magnetic coupling device further includes a rectification circuit, and includes a controllable load bank or is configured to be connected to an external controllable load back. The transmit pad inspection device is configured to determine the efficiency of power transfer under various coupling conditions. In addition, the transmit pad inspection device can be configured to measure residual magnetic field and the frequency of the input current, and to determine whether the charging device has been installed properly.