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In order to address the issue of large output voltage variation from self-powered current transformer in smart measurement switch，ultra wide input voltage range post-stage DC-DC module is required to generate stable system voltage rails. A ultra wide input DC-DC module based on constant on-time control and asynchronous Buck circuit operating in discontinuous mode was proposed. Accroding to the gap between intput voltage and output voltage，variable frequency control and quasi-fixed freqency control were combined. With large voltage gap conversion realized，this DC-DC module also features super fast dynamic response. PSIM software was used to analyze and verify the characteristics of the propsed DC-DC module. A 5 W hardware prototype was fabricated and tested to produce key experimental waveforms. The experimental results demonstrate that the proposed DC-DC module has features of ultra wide input range，super fast dynamic response and high stability.
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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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