Full
Outline
In view of the problem that the traditional LLC resonant converters cannot well meet the requirements of wide voltage gain due to their narrow voltage gain range, a DC-DC converter with a wide input voltage range based on a multi-resonant structure is proposed, which achieves a wide voltage gain in both the under-resonant and over-resonant frequency ranges. The topology of the proposed resonant converter and its working principle are introduced, its fundamental wave equivalent mathematical model is established, and the voltage gain and input impedance characteristics are analyzed in detail. On this basis, the influences of each resonance parameter on the voltage gain, input impedance and working efficiency are analyzed, and the parameter design process of a 500 W converter is given. Finally, an experimental platform with rated power of 500 W was built. Experimental results show that the proposed converter not only had a wide voltage gain in both the under-resonance and over-resonance frequency ranges, but also can transmit the fundamental wave and third-order harmonic power, thus improving its working efficiency. In addition, this converter had good soft-start and short-circuit current limiting capabilities.
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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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