Full
Outline
In the multi-load wireless charging field, it is often necessary to provide constant voltage (CV) or constant current (CC) output for charging the receiving equipment. However, in the existing research on the multi-load wireless power transfer (WPT) system, there is usually just one mode, i.e., CV or CC, and the work in which both the CV output and CC output are provided is seldom reported. A coplanar two-branch WPT system was proposed, which can provide two branches of load-independent output, i.e., one CC output and another CV output. The two branches can be designed independently without affecting each other. By switching control or moving away one branch, three kinds of power supply modes can be provided, i.e., both the CC and CV branches, only the CV branch, and only the CC branch. First, the topological structure of the two-branch WPT system was introduced, and the principle of load-independent and two branches operating independently was explained in detail. Second, the influence of loss on the system performance and the estimation method for the dynamic range of load were revealed. Finally, a two-branch experimental platform consisting of five resonators was built, and the experimental and theoretical results were in good agreement. By inserting ferrite plates to the junctions of coplanar adjacent coils, the magnetic coupling between adjacent coils was enhanced significantly, and the system transmission efficiency was improved as a result. In the three operating modes (i.e., charging only the CC load, only the CV load, or both the CC and CV loads simultaneously), the measured maximum transmission efficiency reached 89.2%, 93.5% and 91.6%, respectively.
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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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