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High-precision power converters are core components of ultra-precision motor motion control systems.Their output current harmonic distortion can cause unnecessary positioning fluctuations in ultra-precision motors，severely impacting the precision control system.Total harmonic distortion is an important index in high-performance precision control fields. A class of dual-buck topologies with no dead-time characteristics can eliminate the current distortion caused by dead-time in traditional bridge topologies and output high-quality，stable waveforms. To further improve the output current harmonic distortion of a class of dual-buck topologies，the sources of harmonic distortion in a class of dual-buck topologies were first clarified.For the harmonic distortion issues introduced by the power conversion stage and control system of a class of dual-buck topologies，the characteristics of low harmonic distortion a class of dual-buck topologies were summarized.The mechanisms of suppressing harmonic distortion by different control methods were revealed，and the relationship between various modulation strategies and harmonic distortion was studied. Finally，specific application scenarios for low-distortion a class of dual-buck converters were summarized，and reference directions for their future development were provided.
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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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