Abstract
The intrusion of a metal object into a wireless charging system could cause safety issues, such as temperature rise and even combustion. This paper proposes a double-layer symmetric sensing coil design for metal object detection (MOD) of wireless electric vehicle charging to prevent the detection blind area. First, the magnetic effect and the eddy current effect of a metal object in high-frequency magnetic fields are analyzed. Second, the principle of the proposed double-layer symmetric sensing coils is detailed. Finally, the finite element simulation is implemented in order to test the performance of the proposed sensing coil design. The simulation results show that the proposed double-layer symmetric sensing coils can effectively detect the presence and position of the metal object simultaneously.
Highlights
Wireless power transfer (WPT) has the advantages of safety, highly efficiency and reliability, it has been widely used in electric vehicles, household appliances and other commercial fields [1]-[2]
The Tx coil for wireless electric vehicle charging is much larger than a general metal object, so it is difficult to detect the slight change of system parameters caused by the intrusion of a small metal object
When a metal object is located in alternating current (AC) magnetic fields, the eddy current will be generated in the metal object, causing changes in inductance, resistance and quality factor of the Tx coil
Summary
Wireless power transfer (WPT) has the advantages of safety, highly efficiency and reliability, it has been widely used in electric vehicles, household appliances and other commercial fields [1]-[2]. Due to the special structure of a wireless charging system, a large air gap filled with high power and high frequency magnetic fields exists between the transmitting (Tx) coil and the receiving (Rx) coil. If a large number of eddy current are generated in a high-resistance metal object, the high temperature caused by ohmic losses will eventually lead to safety concerns such as combustion. To avoid such a situation, some metal object detection (MOD) technologies have been developed. The Tx coil for wireless electric vehicle charging is much larger than a general metal object, so it is difficult to detect the slight change of system parameters caused by the intrusion of a small metal object. Theoretical analysis and simulation validation will be introduced in the following chapters to verify the effectiveness and feasibility of the proposed double-layer symmetric sensing coils
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