Full
Outline
A passive electromagnetic interference (EMI) filter can effectively suppress the conducted EMI of an on-board DC-DC converter at the cost of increasing the volume and cost of equipment, which runs counter to the original intention of high-power density design of electronic equipment. The suppression of conducted EMI by the combination of spread spectrum modulation and the filter can effectively reduce EMI and the filter volume as well. First, the method and process of EMI filter design are studied. Second, the principle of reducing EMI by spread spectrum modulation is analyzed. Combined with the calculation method for filter cut-off frequency, the optimal spread spectrum parameters are calculated, which increases the cut-off frequency in the design of a common-mode choke coil and effectively reduces the filter size. Finally, experimental results show that the spread spectrum modulation combined with the filter has a good suppression effect on the EMI of the on-board DC-DC converter, and the volumes of a compact common-mode choke coil and a filter after the spread spectrum modulation are reduced by 63% and 44% respectively compared with those of a common-mode choke coil and a filter used in the fixed frequency modulation.
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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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