Full
Outline
The wireless charging technology for electric vehicles can overcome the shortcomings of traditional wired charging methods such as low convenience and high safety risk, but the magnetic flux leakage in its transmission process may lead to electromagnetic interference and even pose a threat to human health. To solve the magnetic flux leakage problem in wireless charging, the magnetic field distribution around a high-power DD coil is studied, and a novel active shielding design is proposed, i.e., the active shielding coil is directly connected in series with the primary coil to reduce the leakage magnetic field. At the same time, the additional coupling between the shielding coil and the receiving coil of the wireless charging system is eliminated. In addition, multi-objective optimization is performed to determine the optimal parameters of the shielding coil with the maximum magnetic flux density of the target surface, the output power of system load and the system transmission efficiency as the objective functions. Finally, a 5 kW experimental prototype was built to verify the analysis results and investigate the effect of the shielding coil on the system parameters. Results show that the optimized shielding design reduces the magnetic field intensity in the target region by 33.5%, while the power and efficiency of the wireless charging system are not significantly reduced.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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