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Inverter products have been developing towards higher power density and more compact structure. To enhance the power density of inverter systems within a limited structural space， several prototypes need to be made and a large number of experiments conducted during the research and development process. To shorten the development cycle and reduce the number of prototypes and experiments， a thermal simulation method was proposed for the power unit of the inverter. Through this method， the system steady-state temperature rise of each scheme and the temperature rise of core components can be simulated during the research and development stage. It is possible to compare the advantages and disadvantages of different schemes without making prototypes or conducting experiments. Experimental results verify that the thermal simulation method has relatively accurate prediction of the cooling capacity of the thermal system. This method can effectively improve engineers' ability to control system thermal characteristics during the power unit design stage， quickly compare the advantages and disadvantages of different cooling solutions. It can also reduce the number of prototypes and experimental times， increase the first-time design yield， and reduce research and development costs.
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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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