Abstract
In wireless power transmission systems, the inductance, equivalent resistance, and quality factors of the coils are the main factors that influence the system’s transmission efficiency. When designing high‐power wireless charging coils for electric vehicles (EVs), ferrite bricks that increase magnetic flux can be selected to increase the self‐inductance of the coils, improving the wireless transmission distance and transmission efficiency. In this paper, the effects of the ferrite bricks, the size of the coils, the charging distance, and many other factors in real applications have been extensively studied. After theoretical analysis and simulation, the wireless transmission system has been fabricated and measured. The measured and simulated results are in good agreement. High‐power high‐efficiency wireless power transmission has been achieved for EVs compared with many other previous literatures.
Highlights
A wired method as a traditional power transmission method will inevitably cause line loss during power transmission
This paper focuses on the research on the parameter design and energy efficiency characteristics of the electric vehicle wireless power transmission coil and solves the current problem of ambiguity in the design of a highpower single plane spiral coil
In order to verify whether the coil design meets the design indicators and find the optimal load size of the system, we have adjusted the distance between the two coils to 140 mm, the input voltage value of the DC power supply, and the MOS tube in the high-frequency inverter circuit through the DSP controller of the control circuit
Summary
A wired method as a traditional power transmission method will inevitably cause line loss during power transmission. The solenoid winding coil to the central column of the magnetic core increased the coupling coefficient of the two coils and reduced the size of the coupling mechanism, so that the charging efficiency applied to ZTE new energy vehicles was higher than 90%. This paper focuses on the research on the parameter design and energy efficiency characteristics of the electric vehicle wireless power transmission coil and solves the current problem of ambiguity in the design of a highpower single plane spiral coil. From the perspective of coil design, consider the shape, size, wire diameter, and turn of a single plane spiral coil Considering the factors such as the number and turn spacing, we have designed a wireless power transmission coil that meets a specific power level and efficient transmission. The influence of the magnetic shield size on the inductance, AC equivalent resistance, and distributed capacitance of the coil is studied, and the design basis of the magnetic shield size is given
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